RE: [Zope-dev] Memory Leak Question
Consider it reported then. (Sorry for the delay, I was out of the office for most of last week). It looks like the problem is in Wrapper_findattr. Any thoughts? ___ Daniel Pozmanter Siteworx, Inc. Festina Lente - Gaius Julius -Original Message- From: Chris McDonough [mailto:[EMAIL PROTECTED] Sent: Monday, October 31, 2005 10:33 PM To: Dan Pozmanter Cc: zope-dev@zope.org Subject: Re: [Zope-dev] Memory Leak Question Nobody has yet reported a memory leak symptom against any particular piece of Zope 2.8.X yet, AFAIK. On Oct 31, 2005, at 6:34 PM, Dan Pozmanter wrote: Ahoy, I was poking around in _Acquisition.c, and noticed my memory usage spiked. Returning to the vanilla code (2.8.2-final), I noticed the same spike (just less pronounced). (If you refresh the page a few gazillion times this pops up). I would not categorize this as an actual bug report (I'd like to test more rigorously with a script to verify a leak), but after reading the note on Changes for 2.8.x in the to do section, I was curious: Is this a known issue? If so, has there been any headway, and can I be of any assistance in resolving it? ___ Daniel Pozmanter Siteworx, Inc. Festina Lente - Gaius Julius ___ Zope-Dev maillist - Zope-Dev@zope.org http://mail.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope ) ___ Zope-Dev maillist - Zope-Dev@zope.org http://mail.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] Memory Leak Question
Nobody has yet reported a memory leak symptom against any particular piece of Zope 2.8.X yet, AFAIK. On Oct 31, 2005, at 6:34 PM, Dan Pozmanter wrote: Ahoy, I was poking around in _Acquisition.c, and noticed my memory usage spiked. Returning to the vanilla code (2.8.2-final), I noticed the same spike (just less pronounced). (If you refresh the page a few gazillion times this pops up). I would not categorize this as an actual bug report (I'd like to test more rigorously with a script to verify a leak), but after reading the note on Changes for 2.8.x in the to do section, I was curious: Is this a known issue? If so, has there been any headway, and can I be of any assistance in resolving it? ___ Daniel Pozmanter Siteworx, Inc. 703-520-1550 x209 Festina Lente - Gaius Julius ___ Zope-Dev maillist - Zope-Dev@zope.org http://mail.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope ) ___ Zope-Dev maillist - Zope-Dev@zope.org http://mail.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] Memory Leak Problem
Hi all, I have isolated the memory leak problem on a naked 2.3.3 Zope. I have on ZPsycopgDA and two SQL Methods, one SQL Method contains DTML-IFs and DTML-ELSEs and REQUEST.sets the other SQL Method contains the rendered query of the first, this means there is pure sql in it. Both methods cache there results 60 secs. Zope runs with 4 threads. I wrote a test-script wich opens 4 threads and each thread call the second SQL Methods manage_test via wget. After a restart my zope-processes are around 12MB. Then i start my script and before i receive any result all processes are grown up to 26MB. Even if after i start my script nothing happens, but before i receive the result the processes grow up, maybe i think this is the time where zope gets the results from the database and puts it into the Results-Class( i am right at this point ?). But is the problem in the ZSQLMethod( where the results were cached ) or the ZPsycopgDA ?? Regards, -- Andre SchubertEMail: [EMAIL PROTECTED] Tel: 03774 6625-78 km3 teledienst GmbH Fax: 03774 6625-79 ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] Memory Leak Problem
On Thu, 14 Mar 2002 13:50:13 +0100, Andre Schubert [EMAIL PROTECTED] wrote: After a restart my zope-processes are around 12MB. Sounds about right. Then i start my script and before i receive any result all processes are grown up to 26MB. Thats not unreasonable for the working set of zope. I have no reason to suspect a leak. Im not sure what operating system you are using. If its linux then maybe you are misinterpreting the output of ps or top: The 26M is listed next to each process, but its the *same* 26M in each row of the table. In other words, your system is using 26M total for zope, not 26*5 (assuming you have 5 processes). If Zope grows by 12M for each request then thats a different scenario. 12M growth on the *first* request is quite normal. Toby Dickenson [EMAIL PROTECTED] ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] Memory Leak Problem
Toby Dickenson schrieb: On Thu, 14 Mar 2002 13:50:13 +0100, Andre Schubert [EMAIL PROTECTED] wrote: After a restart my zope-processes are around 12MB. Sounds about right. Then i start my script and before i receive any result all processes are grown up to 26MB. Thats not unreasonable for the working set of zope. I have no reason to suspect a leak. Im not sure what operating system you are using. If its linux then RedHat Immunix 6.2 maybe you are misinterpreting the output of ps or top: The 26M is listed next to each process, but its the *same* 26M in each row of the table. In other words, your system is using 26M total for zope, not 26*5 (assuming you have 5 processes). If Zope grows by 12M for each request then thats a different scenario. 12M growth on the *first* request is quite normal. Yes, i believe, but every time i run that script the memory usage of zope( all processes ) grows up. If the script was ended and zope grows up about 1MB would i think that each request for the ZSQL Methods grows up zope about 250K and 250K * 4 = 1MB. My problem is that every time after running the script zope grows up. Sometimes zope grows up about 1 or 2MB and sometimes only 100K, but zope is growing up every time a run my test-script. On our production server the last time zope grows up to 100MB in 6 hours, and maybe thats not so good. Toby Dickenson [EMAIL PROTECTED] ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope ) ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] Memory Leak Problem
Andre Schubert schrieb: If have changed the that it skips the ZSQLMethod and sends the query used in the ZSQLMethod direct to the manage_test function from the ZPsycopgDA with the result that zope grows up after running the script. If it is possible that the mem-leak is somewhere in the DA, then i post this message to the psycopg mailinglist. Thanks Hi all, I have isolated the memory leak problem on a naked 2.3.3 Zope. I have on ZPsycopgDA and two SQL Methods, one SQL Method contains DTML-IFs and DTML-ELSEs and REQUEST.sets the other SQL Method contains the rendered query of the first, this means there is pure sql in it. Both methods cache there results 60 secs. Zope runs with 4 threads. I wrote a test-script wich opens 4 threads and each thread call the second SQL Methods manage_test via wget. After a restart my zope-processes are around 12MB. Then i start my script and before i receive any result all processes are grown up to 26MB. Even if after i start my script nothing happens, but before i receive the result the processes grow up, maybe i think this is the time where zope gets the results from the database and puts it into the Results-Class( i am right at this point ?). But is the problem in the ZSQLMethod( where the results were cached ) or the ZPsycopgDA ?? Regards, -- Andre SchubertEMail: [EMAIL PROTECTED] Tel: 03774 6625-78 km3 teledienst GmbH Fax: 03774 6625-79 ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope ) ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] Memory Leak Problem
On Tue, 12 Mar 2002 18:38:16 +0100, Oliver Bleutgen [EMAIL PROTECTED] wrote: Acquisition.ImplicitAcquirerWrapper: 42442 That class is used to glue together acquisition content chains. Being top of the list indicates that you have been leaking an acquisition context chain. That doesnt mean that the bug relates to acquisition; acquisition just means that the leak is more severe than otherwise (because it keeps the whole context chain around). OFS.DTMLMethod.DTMLMethod: 3989 42442/3989 = 10.6. That indicates that you are leaking an acquisition chain of roughly 10 objects. ZPublisher.HTTPRequest.HTTPRequest: 3941 ZServer.HTTPResponse.ZServerHTTPResponse: 3934 ZPublisher.BaseRequest.RequestContainer: 3931 AccessControl.DTML.TemplateDict: 3930 The numbers for those objects are all roughly 3900. These objects are the ones referenced by that acquisition chain. I recommend you look further down that list, until you find a number that is much less than 3900. All of the objects above that mark are pieces of the jigsaw puzzle that will tell you *what* is being leaked. Thats where I would start meditating to work out *how* its being leaked. doesn't surely look too good, heh? ;-) No way. Memory leaks are fun. ;-) Toby Dickenson [EMAIL PROTECTED] ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] Memory Leak Problem
Toby Dickenson wrote: On Tue, 12 Mar 2002 18:38:16 +0100, Oliver Bleutgen [EMAIL PROTECTED] wrote: Acquisition.ImplicitAcquirerWrapper: 42442 That class is used to glue together acquisition content chains. Being top of the list indicates that you have been leaking an acquisition context chain. That doesnt mean that the bug relates to acquisition; acquisition just means that the leak is more severe than otherwise (because it keeps the whole context chain around). OFS.DTMLMethod.DTMLMethod: 3989 42442/3989 = 10.6. That indicates that you are leaking an acquisition chain of roughly 10 objects. ZPublisher.HTTPRequest.HTTPRequest: 3941 ZServer.HTTPResponse.ZServerHTTPResponse: 3934 ZPublisher.BaseRequest.RequestContainer: 3931 AccessControl.DTML.TemplateDict: 3930 The numbers for those objects are all roughly 3900. These objects are the ones referenced by that acquisition chain. I recommend you look further down that list, until you find a number that is much less than 3900. All of the objects above that mark are pieces of the jigsaw puzzle that will tell you *what* is being leaked. Thats where I would start meditating to work out *how* its being leaked. Ah, thanks for the nice explanation, Toby. I don't want to abuse your or others time too much, but since this might be interesting in general too, I'll give some more data. To be clear, I don't want to really trace down that leak, we live with it for nearly a year now, the server will be replaced soon, but I'm smelling some zen and my appetite is whet. - I did paste only the objects which have such a high count (next one was approx 200). - This server (2.3.3) has no special products on it, just 2 Folderish ZClasses, which are heavily used (they construct the whole site). So, can we rule out that there's a bug in the zclasses machinery which is the cause for this? I.e. should there be some zclass related object in the above list otherwise? Is it right that in Zope 2.3.x (and others?) usage of dtml-var REQUEST.set(...) can lead to such leakage? Is there a description somewhere what the basic causes of such leakages are? I.e. only bugs in python c-code/zope c-code? Is there some text about what to not do in python product development to avoid introducing leakage? For example, on #zope someone pointed out to me that storing acquisition wrappers in the ZODB will lead to leakage. cheers, oliver ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] Memory Leak Problem
On Wed, 13 Mar 2002 11:37:00 +0100, Oliver Bleutgen [EMAIL PROTECTED] wrote: - I did paste only the objects which have such a high count (next one was approx 200). Hmm. Ill have to ponder what that means. - This server (2.3.3) has no special products on it, just 2 Folderish ZClasses, which are heavily used (they construct the whole site). So, can we rule out that there's a bug in the zclasses machinery which is the cause for this? No, thats not impossible I.e. should there be some zclass related object in the above list otherwise? Not necessarily. The class with the bug need not leave an instance of himself tied up in his immortal cyclic trash. Is it right that in Zope 2.3.x (and others?) usage of dtml-var REQUEST.set(...) can lead to such leakage? Yes, thats true in all versions. Is there a description somewhere what the basic causes of such leakages are? I.e. only bugs in python c-code/zope c-code? No, its possible for a bug in through-the-web edited dtml to cause this. Is there some text about what to not do in python product development to avoid introducing leakage? For example, on #zope someone pointed out to me that storing acquisition wrappers in the ZODB will lead to leakage. In old versions (roughly before 2.3 or 2.4; I forget exactly when) it was possible to create a cyles involving a persistent object having a reference to an acquisition wrapper. Today that raises an exception. Toby Dickenson [EMAIL PROTECTED] ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] Memory Leak Problem
Andre Schubert schrieb: Andy McKay schrieb: Didnt Shane do a leak finder product that can help debug this? http://www.zope.org/Members/hathawsh I will install the LeakFinder product on the server and look what happens If have installed LeakFinder this morning and restarted zope. My processes are grown up from 48MB to 78MB in about 4 hours, it never was so much ( the last time 10MB per week! ) In this time i got the following top 10 refcounts from leakfinder. OFS.Image.Image 36319 DocumentTemplate.DT_Util.Eval 9802 DateTime.DateTime.DateTime 6539 OFS.DTMLDocument.DTMLDocument 5454 OFS.Folder.Folder 5386 OFS.DTMLMethod.DTMLMethod 4850 DocumentTemplate.DT_In.InClass 1725 Products.ZSQLMethods.SQL.SQL 996 Products.TransparentFolders.TransparentFolder.TransparentFolder 458 DocumentTemplate.DT_Let.Let 398 Hope this list helps ... Thanks On March 12, 2002 08:42 am, Chris McDonough wrote: Finding memory leaks is an exercise in binary search. Isolate half of the Zope (and Product) code and find out if it leaks. If it doesn't, you know the problem is in the other half. ;-) Ad infinitum. I'm sorry this is the case, but it almost always boils down to this particular recipe of diagnostics. -- Andy McKay ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope ) -- Andre SchubertEMail: [EMAIL PROTECTED] Tel: 03774 6625-78 km3 teledienst GmbH Fax: 03774 6625-79 ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope ) -- Andre SchubertEMail: [EMAIL PROTECTED] Tel: 03774 6625-78 km3 teledienst GmbH Fax: 03774 6625-79 ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] Memory Leak Problem
One more question then I'll shut up ;-). Toby Dickenson wrote: Is there a description somewhere what the basic causes of such leakages are? I.e. only bugs in python c-code/zope c-code? No, its possible for a bug in through-the-web edited dtml to cause this. Waah, this is the first time I hear that. That means that even if zope/python would be bug-free, it's possible to write dtml that causes a leak? Is there a (non-esoteric) example for that? cheers, oliver ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] Memory Leak Problem
On Wed, 13 Mar 2002 13:46:27 +0100, Oliver Bleutgen [EMAIL PROTECTED]
wrote:
Waah, this is the first time I hear that. That means that even if
zope/python would be bug-free, it's possible to write dtml that causes a
leak?
Is there a (non-esoteric) example for that?
(untested, but the principal is sound)
dtml-call REQUEST.set('foo',x)
where x is some object whose acquisition context includes the REQUEST
object
Toby Dickenson
[EMAIL PROTECTED]
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Re: [Zope-dev] Memory Leak Problem
Finding memory leaks is an exercise in binary search. Isolate half of the Zope (and Product) code and find out if it leaks. If it doesn't, you know the problem is in the other half. ;-) Ad infinitum. I'm sorry this is the case, but it almost always boils down to this particular recipe of diagnostics. - Original Message - From: Andre Schubert [EMAIL PROTECTED] To: zope [EMAIL PROTECTED] Sent: Tuesday, March 12, 2002 10:57 AM Subject: [Zope-dev] Memory Leak Problem Hi all, i have a little problem with my production server. The memory usage of the zope processes running on this server are growing up 100K a day upto 1MB a day. How can i track down the problem. Zope is 2.3.3 Python is 1.5.2 OS is RedHat Immunix 6.2 Hope somebody could help... Thanks, -- Andre SchubertEMail: [EMAIL PROTECTED] Tel: 03774 6625-78 km3 teledienst GmbH Fax: 03774 6625-79 ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope ) ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] Memory Leak Problem
Hi all, i have a little problem with my production server. The memory usage of the zope processes running on this server are growing up 100K a day upto 1MB a day. How can i track down the problem. [snip] Chris McDonough wrote: Finding memory leaks is an exercise in binary search. Isolate half of the Zope (and Product) code and find out if it leaks. If it doesn't, you know the problem is in the other half. ;-) Ad infinitum. I'm sorry this is the case, but it almost always boils down to this particular recipe of diagnostics. A question and one remark. Wouldn't staring at the refcounts in the debug panel also give some info? At least for selfmade products? Something like: Acquisition.ImplicitAcquirerWrapper: 42442 OFS.DTMLMethod.DTMLMethod: 3989 ZPublisher.HTTPRequest.HTTPRequest: 3941 ZServer.HTTPResponse.ZServerHTTPResponse: 3934 ZPublisher.BaseRequest.RequestContainer: 3931 AccessControl.DTML.TemplateDict: 3930 doesn't surely look too good, heh? ;-) Yes this is from a production server, which now get's restarted as it occupies 130MB (up from 15MB in 10 days). The remark, Andre, Chris has written a very nice product, called AutoLance which helps by monitoring zope's memory usage and restarting if a configurable threshold is reached. http://www.zope.org/Members/mcdonc/Products/AutoLance We use it on a production server. cheers, oliver ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] Memory Leak Problem
A question and one remark. Wouldn't staring at the refcounts in the debug panel also give some info? At least for selfmade products? Maybe... depends on your level of Zope Zen. It's hard to tell which classes should and should not have high refcounts. For example, in your sample output, I know that high numbers of references to ImplicitAcquirerWrappers, HTTPRequests, ZServerHTTPResponse, and RequestContainer objects likely indicate a leak of REQUEST objects somewhere in your code. OTOH, the high number of references to DTMLMethods might be totally normal. But I only know these things because I know Zope maybe better than most folks do, and I just... well... *know*. ;-) It's hard to explain the reasons I know these things to other folks (although I started on something like it at http://www.zope.org/Members/mcdonc/HowTos/PreventAndDebugMemLeaks (unfinished). That said, even if I took a day to finish my unfinished HowTo, the only bit of wisdom that I could consistently espouse given Control_Panel - Debug output is that indeed you do have a leak. So you'd know you have a leak (which you knew in the first place). How do you fix it? I don't know. ;-) That's where the binary search comes in. Shane's LeakFinder can make the binary search a bit easier by recording states between leakfinding runs, but it's still mainly an exercise in binary search. The remark, Andre, Chris has written a very nice product, called AutoLance which helps by monitoring zope's memory usage and restarting if a configurable threshold is reached. If you can't solve the problem at least treat the symptoms. ;-) - C ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] Memory Leak Problem
Andy McKay schrieb: Didnt Shane do a leak finder product that can help debug this? http://www.zope.org/Members/hathawsh I will install the LeakFinder product on the server and look what happens On March 12, 2002 08:42 am, Chris McDonough wrote: Finding memory leaks is an exercise in binary search. Isolate half of the Zope (and Product) code and find out if it leaks. If it doesn't, you know the problem is in the other half. ;-) Ad infinitum. I'm sorry this is the case, but it almost always boils down to this particular recipe of diagnostics. -- Andy McKay ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope ) -- Andre SchubertEMail: [EMAIL PROTECTED] Tel: 03774 6625-78 km3 teledienst GmbH Fax: 03774 6625-79 ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] Memory Leak Problem
Oliver Bleutgen schrieb: Hi all, i have a little problem with my production server. The memory usage of the zope processes running on this server are growing up 100K a day upto 1MB a day. How can i track down the problem. [snip] Chris McDonough wrote: Finding memory leaks is an exercise in binary search. Isolate half of the Zope (and Product) code and find out if it leaks. If it doesn't, you know the problem is in the other half. ;-) Ad infinitum. I'm sorry this is the case, but it almost always boils down to this particular recipe of diagnostics. A question and one remark. Wouldn't staring at the refcounts in the debug panel also give some info? At least for selfmade products? Something like: Acquisition.ImplicitAcquirerWrapper: 42442 OFS.DTMLMethod.DTMLMethod: 3989 ZPublisher.HTTPRequest.HTTPRequest: 3941 ZServer.HTTPResponse.ZServerHTTPResponse: 3934 ZPublisher.BaseRequest.RequestContainer: 3931 AccessControl.DTML.TemplateDict: 3930 The Toprefcounts are: Acquisition.ImplicitAcquirerWrapper: 2981 DocumentTemplate.DT_Util.Eval: 1379 OFS.Image.Image: 1194 ZPublisher.HTTPRequest.HTTPRequest: 916 ZServer.PCGIServer.PCGIResponse: 906 ZPublisher.BaseRequest.RequestContainer: 906 ExtensionClass: 361 DocumentTemplate.DT_In.InClass: 263 OFS.Folder.Folder: 250 OFS.DTMLDocument.DTMLDocument: 238 DocumentTemplate.DT_Var.Var: 207 OFS.DTMLMethod.DTMLMethod: 196 AccessControl.PermissionRole.PermissionRole: 184 App.special_dtml.DTMLFile: 182 Products.ZGadflyDA.gadfly.kjParser.ParseRule: 161 re.RegexObject: 153 Shared.DC.Scripts.Signature.FuncCode: 143 and so on. My selfmade products are near the bottom of the list... Thanks doesn't surely look too good, heh? ;-) Yes this is from a production server, which now get's restarted as it occupies 130MB (up from 15MB in 10 days). The remark, Andre, Chris has written a very nice product, called AutoLance which helps by monitoring zope's memory usage and restarting if a configurable threshold is reached. http://www.zope.org/Members/mcdonc/Products/AutoLance We use it on a production server. cheers, oliver ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope ) -- Andre SchubertEMail: [EMAIL PROTECTED] Tel: 03774 6625-78 km3 teledienst GmbH Fax: 03774 6625-79 ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] Memory leak (2)
It's not covered by the data output into the -M log. Objects can leak without requests hanging or taking a long time. But you might be able to turn on profiling (set the PROFILE_PUBLISHER env var to a filename and restart Zope) on a *test* box (do not do it in production, it drastically effects performance), and look at the profile output. If the memory loss is severe, it might help to investigate the methods that have the largest ncalls value (the most frequently called methods). That said, there's no globally easy way to diagnose a memory leak. It's a matter of exclusion. Well there goes that idea. Forgot about profiling, thanks. -- Andy McKay. ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] memory leak
Marco Nova [EMAIL PROTECTED] writes: I've replaced ParsedXML's ExpatBuilder with the pyXML package and I used the sax parser without modifing the code (except for the import), this is the refcounts results. Class April 12, 2001 11:55 am April 12, 2001 12:00 xml.dom.NodeList.NodeList 2103 3678 +1575 xml.dom.Text.Text 1263 2208 +945 xml.dom.NamedNodeMap.NamedNodeMap507 885 +378 xml.dom.Element.Element 499 871 +372 xml.dom.Attr.Attr339 591 +252 xml.dom.DocumentType.DocumentType 710 +3 xml.dom.Document.Document 710 +3 xml.dom.Document.Document increments by 1 each time an xml is procesed (I tried to add a del doc at the end but it's ineffective). So the problem is not ParsedXML but Zope itself or my bad methods. Not necessarily - it's been mentioned that PyXML requires releasing nodes after they're done, so I'd expect this if you replaced ParsedXML's DOM with PyXML's without adding the release. -- Karl Anderson [EMAIL PROTECTED] ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )
RE: [Zope-dev] memory leak
In either case, it seems like you shouldn't be using ParsedXML's ExpatBuilder, which is an interface to PyExpat which is made to create ParsedXML's DOM objects. You should be using your own PyExpat interface to parse this information from your XML input, without the overhead of generating a DOM tree that you're just going to throw away. The interface is documented in the XML-SIG topic area on python.org, and our ExpatBuilder should be a good example on how to interface with our PyExpat installation - just don't build the DOM if you don't use it. Regardless of what you *should* be doing :), or if I'm misreading you, if you aren't keeping references to the DOM objects being created, then they should be reclaimed by the GC, and you do seem to have DOM objects lying around. I'd like to see your code, is it short enough to post? Or you can chuck it into the collector or ParsedXML tracker. For debugging purporses, I'd suggest simplifying by supplying an XML string directly, rather than from an external server. I've replaced ParsedXML's ExpatBuilder with the pyXML package and I used the sax parser without modifing the code (except for the import), this is the refcounts results. Class April 12, 2001 11:55 am April 12, 2001 12:00 xml.dom.NodeList.NodeList 2103 3678 +1575 xml.dom.Text.Text 1263 2208 +945 xml.dom.NamedNodeMap.NamedNodeMap507 885 +378 xml.dom.Element.Element 499 871 +372 xml.dom.Attr.Attr339 591 +252 xml.dom.DocumentType.DocumentType 710 +3 xml.dom.Document.Document 710 +3 xml.dom.Document.Document increments by 1 each time an xml is procesed (I tried to add a del doc at the end but it's ineffective). So the problem is not ParsedXML but Zope itself or my bad methods. Regards, - mn ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )
RE: [Zope-dev] memory leak
have you checked the debug page in the control panel and
noted any refcounts
increasing?
Class April 10, 2001 9:17 am April 11, 2001 8:34 am
Products.ParsedXML.DOM.Core.Text 3241 27318 +24077
Products.ParsedXML.DOM.Core.Element 1777 14493 +12716
Products.ParsedXML.DOM.ExpatBuilder.ExpatBuilder 81 1506 +1425
Products.ParsedXML.Printer.PrintVisitor 3 107 +104
Products.ParsedXML.DOM.Core.Document 10 112 +102
Yes, I've a lot of refcounts leaks.
any chance that this is the same problem that andy is running
into (read his
posts above)?
I dunno because of my very lack of knowledge of Zope.
All of these refcounts leaks means that the Product is doing something wrong
or that I'm using in the wrong manner ?
- mn
-d
On Tue, Apr 10, 2001 at 05:27:28PM +0200, Marco Nova wrote:
Hello guys,
It seems that I've some memory leak problems and I want to
understand where
I've to look for.
Scenario:
I've an IIS web server that generates an XML page (taking data from
SqlServer);
The Zope web server must retrieve the XML page, manage the
data and render
them in HTML (I cant only apply a XSL stylesheet to XML).
The Facts:
I've written a external method that - using httplib - reads
the XML page and
return a string that is the raw XML sources, than I've
written another
external method that use ExpatBuilder of
Products.ParsedXML.DOM to parse the
XML an generate a list of [(id - {mapping})] which will be
accessed with a
dtml-in tag, so in the sequence-key I've access to the ID and with
sequence-item I can access to the mapping object.
I'm using latest version of ZOPE (2.3.1, the binary one
with Python 1.5.2)
and ParsedXML.
The Problem:
It seems that every time the method retrieve the page or
parse the XML I
loose a bunch of kilobytes. Because the methods are very
simple (100 lines
of code in total) and because I didn't create any class for
handling this
workflow I can't understand where I can loose bytes.
The Questions:
Is the list generated for the dtml-in tag freed
automatically by ZOPE ?
Is there a Garbage Collector somewhere that must be activated ?
Should I avoid the use of the ExpatBuilder for XML processing ?
Thanks for listening my newbies questions.
Best Regards,
- mn
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Re: [Zope-dev] memory leak
Hi Marco,
This looks like a potential bug in either ParsedXML or the code you're using
to manipulate the components within ParsedXML.
We'd like to find out! ;-) Do you think you can file a collector report
with enough information in it to reproduce this behavior?
Many thanks,
- C
- Original Message -
From: "Marco Nova" [EMAIL PROTECTED]
To: "Zope-Dev (E-mail)" [EMAIL PROTECTED]
Sent: Wednesday, April 11, 2001 2:29 AM
Subject: RE: [Zope-dev] memory leak
have you checked the debug page in the control panel and
noted any refcounts
increasing?
Class April 10, 2001 9:17 am April 11, 2001 8:34 am
Products.ParsedXML.DOM.Core.Text 3241 27318 +24077
Products.ParsedXML.DOM.Core.Element 1777 14493 +12716
Products.ParsedXML.DOM.ExpatBuilder.ExpatBuilder 81 1506 +1425
Products.ParsedXML.Printer.PrintVisitor 3 107 +104
Products.ParsedXML.DOM.Core.Document 10 112 +102
Yes, I've a lot of refcounts leaks.
any chance that this is the same problem that andy is running
into (read his
posts above)?
I dunno because of my very lack of knowledge of Zope.
All of these refcounts leaks means that the Product is doing something
wrong
or that I'm using in the wrong manner ?
- mn
-d
On Tue, Apr 10, 2001 at 05:27:28PM +0200, Marco Nova wrote:
Hello guys,
It seems that I've some memory leak problems and I want to
understand where
I've to look for.
Scenario:
I've an IIS web server that generates an XML page (taking data from
SqlServer);
The Zope web server must retrieve the XML page, manage the
data and render
them in HTML (I cant only apply a XSL stylesheet to XML).
The Facts:
I've written a external method that - using httplib - reads
the XML page and
return a string that is the raw XML sources, than I've
written another
external method that use ExpatBuilder of
Products.ParsedXML.DOM to parse the
XML an generate a list of [(id - {mapping})] which will be
accessed with a
dtml-in tag, so in the sequence-key I've access to the ID and with
sequence-item I can access to the mapping object.
I'm using latest version of ZOPE (2.3.1, the binary one
with Python 1.5.2)
and ParsedXML.
The Problem:
It seems that every time the method retrieve the page or
parse the XML I
loose a bunch of kilobytes. Because the methods are very
simple (100 lines
of code in total) and because I didn't create any class for
handling this
workflow I can't understand where I can loose bytes.
The Questions:
Is the list generated for the dtml-in tag freed
automatically by ZOPE ?
Is there a Garbage Collector somewhere that must be activated ?
Should I avoid the use of the ExpatBuilder for XML processing ?
Thanks for listening my newbies questions.
Best Regards,
- mn
___
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RE: [Zope-dev] memory leak
-Original Message-
From: Chris McDonough [mailto:[EMAIL PROTECTED]]
Sent: mercoled 11 aprile 2001 9.04
To: Marco Nova; Zope-Dev (E-mail)
Subject: Re: [Zope-dev] memory leak
This looks like a potential bug in either ParsedXML or the
code you're using
to manipulate the components within ParsedXML.
We'd like to find out! ;-) Do you think you can file a
collector report
with enough information in it to reproduce this behavior?
I can send you the code for the two external method I use, they only need a
webserver (that could be zope too) that serve an XML page (I can provide the
XML the methods needs) and the bunch of dtml methods I use to show the XML.
Anyway I will try to understand what's happening with ParsedXML and my code.
- mn
- Original Message -
From: "Marco Nova" [EMAIL PROTECTED]
To: "Zope-Dev (E-mail)" [EMAIL PROTECTED]
Sent: Wednesday, April 11, 2001 2:29 AM
Subject: RE: [Zope-dev] memory leak
have you checked the debug page in the control panel and
noted any refcounts
increasing?
Class April 10, 2001 9:17 am April 11, 2001 8:34 am
Products.ParsedXML.DOM.Core.Text 3241
27318 +24077
Products.ParsedXML.DOM.Core.Element 1777
14493 +12716
Products.ParsedXML.DOM.ExpatBuilder.ExpatBuilder 81 1506 +1425
Products.ParsedXML.Printer.PrintVisitor 3 107 +104
Products.ParsedXML.DOM.Core.Document 10 112 +102
Yes, I've a lot of refcounts leaks.
any chance that this is the same problem that andy is running
into (read his
posts above)?
I dunno because of my very lack of knowledge of Zope.
All of these refcounts leaks means that the Product is
doing something
wrong
or that I'm using in the wrong manner ?
- mn
-d
On Tue, Apr 10, 2001 at 05:27:28PM +0200, Marco Nova wrote:
Hello guys,
It seems that I've some memory leak problems and I want to
understand where
I've to look for.
Scenario:
I've an IIS web server that generates an XML page
(taking data from
SqlServer);
The Zope web server must retrieve the XML page, manage the
data and render
them in HTML (I cant only apply a XSL stylesheet to XML).
The Facts:
I've written a external method that - using httplib - reads
the XML page and
return a string that is the raw XML sources, than I've
written another
external method that use ExpatBuilder of
Products.ParsedXML.DOM to parse the
XML an generate a list of [(id - {mapping})] which will be
accessed with a
dtml-in tag, so in the sequence-key I've access to the
ID and with
sequence-item I can access to the mapping object.
I'm using latest version of ZOPE (2.3.1, the binary one
with Python 1.5.2)
and ParsedXML.
The Problem:
It seems that every time the method retrieve the page or
parse the XML I
loose a bunch of kilobytes. Because the methods are very
simple (100 lines
of code in total) and because I didn't create any class for
handling this
workflow I can't understand where I can loose bytes.
The Questions:
Is the list generated for the dtml-in tag freed
automatically by ZOPE ?
Is there a Garbage Collector somewhere that must be activated ?
Should I avoid the use of the ExpatBuilder for XML processing ?
Thanks for listening my newbies questions.
Best Regards,
- mn
___
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Re: [Zope-dev] memory leak
The bugreport won't do us as much good if we need to set up an elaborate
testing environment... it'd be preferable if you could break it down enough
to make it happen in a single external method or pythonscript that doesn't
rely on external webservers or databases, or what-have-you... but we'll take
whatever you've got!
- C
- Original Message -
From: "Marco Nova" [EMAIL PROTECTED]
To: "'Chris McDonough'" [EMAIL PROTECTED]
Cc: "Zope-Dev (E-mail)" [EMAIL PROTECTED]
Sent: Wednesday, April 11, 2001 6:34 AM
Subject: RE: [Zope-dev] memory leak
-Original Message-
From: Chris McDonough [mailto:[EMAIL PROTECTED]]
Sent: mercoled 11 aprile 2001 9.04
To: Marco Nova; Zope-Dev (E-mail)
Subject: Re: [Zope-dev] memory leak
This looks like a potential bug in either ParsedXML or the
code you're using
to manipulate the components within ParsedXML.
We'd like to find out! ;-) Do you think you can file a
collector report
with enough information in it to reproduce this behavior?
I can send you the code for the two external method I use, they only need a
webserver (that could be zope too) that serve an XML page (I can provide the
XML the methods needs) and the bunch of dtml methods I use to show the XML.
Anyway I will try to understand what's happening with ParsedXML and my code.
- mn
- Original Message -
From: "Marco Nova" [EMAIL PROTECTED]
To: "Zope-Dev (E-mail)" [EMAIL PROTECTED]
Sent: Wednesday, April 11, 2001 2:29 AM
Subject: RE: [Zope-dev] memory leak
have you checked the debug page in the control panel and
noted any refcounts
increasing?
Class April 10, 2001 9:17 am April 11, 2001 8:34 am
Products.ParsedXML.DOM.Core.Text 3241
27318 +24077
Products.ParsedXML.DOM.Core.Element 1777
14493 +12716
Products.ParsedXML.DOM.ExpatBuilder.ExpatBuilder 81 1506 +1425
Products.ParsedXML.Printer.PrintVisitor 3 107 +104
Products.ParsedXML.DOM.Core.Document 10 112 +102
Yes, I've a lot of refcounts leaks.
any chance that this is the same problem that andy is running
into (read his
posts above)?
I dunno because of my very lack of knowledge of Zope.
All of these refcounts leaks means that the Product is
doing something
wrong
or that I'm using in the wrong manner ?
- mn
-d
On Tue, Apr 10, 2001 at 05:27:28PM +0200, Marco Nova wrote:
Hello guys,
It seems that I've some memory leak problems and I want to
understand where
I've to look for.
Scenario:
I've an IIS web server that generates an XML page
(taking data from
SqlServer);
The Zope web server must retrieve the XML page, manage the
data and render
them in HTML (I cant only apply a XSL stylesheet to XML).
The Facts:
I've written a external method that - using httplib - reads
the XML page and
return a string that is the raw XML sources, than I've
written another
external method that use ExpatBuilder of
Products.ParsedXML.DOM to parse the
XML an generate a list of [(id - {mapping})] which will be
accessed with a
dtml-in tag, so in the sequence-key I've access to the
ID and with
sequence-item I can access to the mapping object.
I'm using latest version of ZOPE (2.3.1, the binary one
with Python 1.5.2)
and ParsedXML.
The Problem:
It seems that every time the method retrieve the page or
parse the XML I
loose a bunch of kilobytes. Because the methods are very
simple (100 lines
of code in total) and because I didn't create any class for
handling this
workflow I can't understand where I can loose bytes.
The Questions:
Is the list generated for the dtml-in tag freed
automatically by ZOPE ?
Is there a Garbage Collector somewhere that must be activated ?
Should I avoid the use of the ExpatBuilder for XML processing ?
Thanks for listening my newbies questions.
Best Regards,
- mn
___
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RE: [Zope-dev] memory leak
Marco Nova writes: have you checked the debug page in the control panel and noted any refcounts increasing? Class April 10, 2001 9:17 am April 11, 2001 8:34 am Products.ParsedXML.DOM.Core.Text 3241 27318 +24077 Products.ParsedXML.DOM.Core.Element 1777 14493 +12716 Products.ParsedXML.DOM.ExpatBuilder.ExpatBuilder 81 1506 +1425 Products.ParsedXML.Printer.PrintVisitor 3 107 +104 Products.ParsedXML.DOM.Core.Document 10 112 +102 Yes, I've a lot of refcounts leaks. I do not know "ParsedXML"'s DOM implementation. However, cycles are quite common for DOM's due to the cyclic relationship between parent and children. Unless great care is taken, DOM tree can be highly cyclic and would therefore not be garbage collectable by Pythons 1.5.2 reference counting garbage collector. Dieter ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] memory leak
have you checked the debug page in the control panel and noted any refcounts
increasing?
any chance that this is the same problem that andy is running into (read his
posts above)?
-d
On Tue, Apr 10, 2001 at 05:27:28PM +0200, Marco Nova wrote:
Hello guys,
It seems that I've some memory leak problems and I want to understand where
I've to look for.
Scenario:
I've an IIS web server that generates an XML page (taking data from
SqlServer);
The Zope web server must retrieve the XML page, manage the data and render
them in HTML (I cant only apply a XSL stylesheet to XML).
The Facts:
I've written a external method that - using httplib - reads the XML page and
return a string that is the raw XML sources, than I've written another
external method that use ExpatBuilder of Products.ParsedXML.DOM to parse the
XML an generate a list of [(id - {mapping})] which will be accessed with a
dtml-in tag, so in the sequence-key I've access to the ID and with
sequence-item I can access to the mapping object.
I'm using latest version of ZOPE (2.3.1, the binary one with Python 1.5.2)
and ParsedXML.
The Problem:
It seems that every time the method retrieve the page or parse the XML I
loose a bunch of kilobytes. Because the methods are very simple (100 lines
of code in total) and because I didn't create any class for handling this
workflow I can't understand where I can loose bytes.
The Questions:
Is the list generated for the dtml-in tag freed automatically by ZOPE ?
Is there a Garbage Collector somewhere that must be activated ?
Should I avoid the use of the ExpatBuilder for XML processing ?
Thanks for listening my newbies questions.
Best Regards,
- mn
___
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