Re: [Zope-dev] Do I really understanding caching?
Andy McKay wrote: What problem are you trying to solve -- response time, memory usage, disk usage? All of the above :) Describe some of the symptoms back on the list and let's talk about it there. For instance, you can trade RAM for performance by adjusting knobs on the catalog. --Paul ___ 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] Do I really understanding caching?
Andy McKay wrote: We have been looking at caching in Zope as a way of tweaking performance. Heres an example of what I think happens: - Supposing I have a 1,000 object catalog. If one person changes an catalog aware object, that instance of the catalog will be pulled out of the ZODB and changed. It will then be written to the ZODB. That last copy will stay in the cache for as long as the "Cache Parameters" are set to allow. - If somebody changes another catalog aware object, that will repeat the above process. - However simply accessing the catalog (no changes) will pull the object from the cache. - What would be really nice is if the object only got written to the cache when it is no longer used, that way every time the catalog changed it didnt write to ZODB instead it changed the cached version. Of course that does bring up the recovering from disaster problem. So do I understand it correctly? Not exactly. Have you seen the ZODB paper? http://www.zope.org/Members/jim/Info/IPC8/ZODB3 You can think of the normal ZODB cache as being a tool that manages the objects in memory. Whenever an object has been accessed, it is in the cache. The cache, together with the database are responsible for moving objects, and their state in and out of memory. An object can be in serveral in memory states. Two that are of interest, from a caching perspective, are the "ghost" state and the up-to-date state. The up-to-date state is a state in which the object and it's state are loaded. In the ghost state, the object is in memory, but it has now state. The cache manager tries to release an object's state and remove the object from memory when it is not used. An object's state is released when it hasn't been accessed in a long time. It can be removed when no other objects (not counting the cache itself) refer to it. Note that the cache parameters are only guides for an algorithm that is somewhat adaptive and a bit more complicated than the parameters suggest. For example, the target cache size is a target, not a limit. The cache sizes are usually mich higher than the target. Another thing to be aware of is that large objects are generally designed to spread their state over many subobjects so that they can make effective use of the cache. A catalog may have hundreds of sub-objects, only a small fraction of which are kept in memory at a time. Jim -- Jim Fulton mailto:[EMAIL PROTECTED] Technical Director (888) 344-4332 Python Powered! Digital Creationshttp://www.digicool.com http://www.python.org Under US Code Title 47, Sec.227(b)(1)(C), Sec.227(a)(2)(B) This email address may not be added to any commercial mail list with out my permission. Violation of my privacy with advertising or SPAM will result in a suit for a MINIMUM of $500 damages/incident, $1500 for repeats. ___ 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] Membership and Local Roles
Michael Bernstein wrote: Michael Bernstein wrote: I figured out how to get this to work (finally). In the acl_users LM, add the following two Python methods: Well, I discovered another problem: For some reason, when I create a PortalMembership member, add the two Python methods as I described earlier, and use the local roles screen to give them a role, they are subsequently authenticated regardless of whether their password is correct. Here's an example illustrating the bug: [snip example] This password problem is fixed with Bill Andersons new release of Membership 0.7.6, so the local roles fix now works generally. There is still a platform dependent password problem with Membership though. It affects Solaris and HPUX (possibly other unices) but not Linux, and has to do with the crypt module not being loaded correctly on those platforms, causing passwords to be encrypted omly part of the time. Here is the fix for local roles: First, the User Source needs to support a getUserNames method. This can be done two ways: You can add a Python method to the LoginManager named getUserNames that takes a 'self' parameter, and has the following body: user_ids=self.UserSource.getPersistentItemIDs() names=[] for i in user_ids: names.append(i) return names Or you can add the following code directly to the PersistentUserSource.py file, preferably right befor or after the getUsers method: def getUserNames(self): user_ids=self.getPersistentItemIDs() names=[] for i in user_ids: names.append(i) return names (I hope this will get included in future versions of Membership) Next we need to provide a user_names method in the LoginManager. Currently I only have a Python method to drop in to the LM. it takes a 'self' parameter, and has the following body if it's calling another Python method: return self.getUserNames() Or if you're calling the method in PersistentUserSource.py, it has this body: return self.UserSource.getUserNames() Note that this user_names method has some disadvantages, and it needs to be generalized to deal with multiple User Sources that aren't all named UserSource, and that may not all implement the getUserNames interface, and that may have duplicate user names in them. Suggestions on how to do this would be welcome. I hope that this little set of instructions helps others who are trying to integrate LM with the existing security interface and local roles. Comments, testing, and improvements would be welcomed. HTH, Michael Bernstein. ___ 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] Problem with properties in inherited ZClasses
Stephen Simmons wrote: I have tried to create another ZClass, AdminTools:Task that inherits from AdminTools:Folder that adds some task tracking functionality and uses/overrides the AdminTools:Folder methods for displaying objects I tend to try not to have ZClasses derive from other ZClasses. You'd find it more straightforward either to derive both ZClasses from a common Python base class, or to keep both ZClasses independent of each other. In general, I try to avoid using inheritence. Python and Zope support polymorphism whether you derive classes from the same base-class or not. Also, I find the coupling introduced by inheritence more trouble than it is worth for the reduced redundancy. I realize that I have avoided trying to answer why ZClasses work in this way. File D:\Dev\ZopeTestbed\lib\python\OFS\PropertySheets.py, line 235, in _setProperty (Object: Task) Bad Request: (see above) I don't understand why I can add the 'title' property to Task but not 'description'. Here's the code that is raising the exception: if hasattr(aq_base(self),id): if not (id=='title' and not self.__dict__.has_key(id)): raise 'Bad Request', ( 'Invalid property id, em%s/em. It is in use.' % id) You can see that 'title' has a special status as a property. To conclude: (i) What is going on and how can I fix it? Don't do things that way to start with. (ii) When using a ZClass as a base class, do instances inherit any properties, or do they just get access to the base class's methods? If ZClasses do inherit properties from parent ZClasses, how do I reach them via the property sheets? If you add propertysheets to instances of your classes, rather than to the classes, then you don't get conflicts over attributes. However, unless you use ZPatterns or something like that, you have to refer to the attributes of propertysheets explicitly naming the propertysheet. (iii) Is there a simple way to find out what methods and properties an object has? I would like to see what it defines, what it inherits and what it acquires. Yes. See the code above from PropertySheets.py. Use something like this in an external method to find out the attributes of an object. (In python, methods and fields are both attributes.) You can use the magic aq_* attributes of acquisition wrappers to walk through the objects that get considered during acquisition. You might also want to look at Shane Hathaway's Acquisition Explainer, an external method to show how acquisition works, that also demonstrates use of the aq_* attributes. -- Steve Alexander Software Engineer Cat-Box limited http://www.cat-box.net ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
Re: [zope] What options exist for dealing with traceback
On 23 Sep 2000, at 10:27, [EMAIL PROTECTED] [EMAIL PROTECTED] ([EMAIL PROTECTED]) wrote: From: Skip Montanaro [EMAIL PROTECTED] Subject: What options exist for dealing with tracebacks? I would love it if I could set some debug environment variable, run with -D="[EMAIL PROTECTED]" or subclass some Error class and have tracebacks mailed to me. I wouldn't even care about the flood of email. At least I'd have all the inputs. I have modified the Standard Error Message for emailing each time an error occurs. Works fine for me. - dtml-comment * MAIL a l'administrateur */dtml-comment dtml-sendmail mailhost="MailHost" mailto="[EMAIL PROTECTED]" mailfrom="[EMAIL PROTECTED]" To : Zope Admin [EMAIL PROTECTED] From : Zope Web Server ERROR [EMAIL PROTECTED] Subject : Zope Error at dtml-var URL URL de la page : dtml-var URL dtml-with URLmodifiée le dtml-var "bobobase_modification_time()"/dtml-with [other parameters, version, etc ...] dtml-in "REQUEST.items()" sort dtml-var sequence-key: dtml-var sequence-item /dtml-in dtml-if error_message dtml-var error_message dtml-else [whatever you need] /dtml-if /dtml-sendmail Valeur de l'erreur: !--#var error_value-- --- End of forwarded message --- -- Divine Rites - Strasbourg, France === 10" Storming the Citadel available via mail order only ! Check it on http://www.divinerites.com/dr_drr.htm Radio Birdman, New Christs, Deniz Tek, Citadel Records more ... http://www.divinerites.com ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
[Zope] trouble with SiteAccess; can't manage subtree mapped to inaccessible domain name
I set up SiteAccess 2-0-0b3 on Zope 2.2.2 so that two virtual hosts front-ended by Apache map to two different subtrees in Zope. That worked OK until the local DNS server lost the entry for one of my domains. I'm working on fixing that (it's out of my hands) but I find that in the meantime I can't even get to the corresponding Zope subtree in manage mode! I think the SiteAccess object I created is still mapping URLs to the domain name which now fails to resolve. How do I get out of this jam? I tried deleting the Products/SiteAccess folder, restarting Zope, and deleting the SiteAccess product from the Control_Panel/Products view, but now I'm getting an AttributeError when I try to access the subtree that has a SiteAccess object. Since I can't get to that tree, I can't figure out how to delete that object. Is there some way to delete it by name from a higher point in the tree? -- Fred Yankowski [EMAIL PROTECTED] tel: +1.630.879.1312 Principal Consultant www.OntoSys.com fax: +1.630.879.1370 OntoSys, Inc 38W242 Deerpath Rd, Batavia, IL 60510, USA ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] trouble with SiteAccess; can't manage subtree mapped to inaccessible domain name
From: "Fred Yankowski" [EMAIL PROTECTED] How do I get out of this jam? I tried deleting the Products/SiteAccess folder, restarting Zope, and deleting the SiteAccess product from the Control_Panel/Products view, but now I'm getting an AttributeError when I try to access the subtree that has a SiteAccess object. Since I can't get to that tree, I can't figure out how to delete that object. Is there some way to delete it by name from a higher point in the tree? Yow! No need for such extreme measures. Put SiteAccess back, then open the management interface for the subtree folder in your Zope, using: http://your.zope/the-subtree/_SUPPRESS_SITEROOT/manage_main ...and delete the SiteRoot. Cheers, Evan @ digicool 4-am ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
[Zope] Mutiple images don't always show up
Hi, I have observed that in some Zope installations (I am using Zope 2.1.6 through PCGI on Linux, my browser is Internet Explorer 5.5), if I have more than 4 or 5 images (currently I have one page with 12 GIF images), sometimes not all the pictures show up. If I reload the page, the problem is often fixed. I have seen similar situations both with static images and dynamic images (images generated by Python programs.) I am not sure whether the problem is in the browser, in the Zope server, or in my ISP. Has anyone seen something similar? regards, Hung Jung - PS- related to this, I also know that for Zope 2.1.x there is some thread competing write problem: when two threads (from different browser windows) compete in writing, one browser window does not receive any response. I know Zope is supposed to abort one of the threads and restart it, and matter of fact I do see that happen when I insert print statements. But it's just strange that the browser window does not display anything. This problem reportedly happens with Zope 2.1.6 and 2.1.x, both on Linux and Windows, with IE5 and Netscape browsers alike. This could be a different problem, though. _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] Mutiple images don't always show up
It kind of make me feel better to know other people have observed the same problem. I found the following message in the mailing list by Pierre-Julien Grizel around 09/04/2000, with title: [Zope] Images slow rendering problem http://zope.nipltd.com/public/lists/zope-archive.nsf/242bb7cc2b2c343d802568ab003585d4/cb99522a7c8258f280256950002d9618?OpenDocument So, it does seem that Zope 2.1.6 has some problems handling multiple images. The problem seems to happen at least with Unix flavor OS (Linux, Solaris, FreeBSD,) and seems to be browser-independent (Netscape and IE alike). I don't think it's the If-Modified-Since problem, since I have applied the patch in http://classic.zope.org:8080/Collector/1388/view and it did not make a difference. regards, Hung Jung PS- correction: in my previous message, where I said Zope 2.1.x, should have been 2.2.x. --- In [EMAIL PROTECTED], "Hung Jung Lu" [EMAIL PROTECTED] wrote: Hi, I have observed that in some Zope installations (I am using Zope 2.1.6 through PCGI on Linux, my browser is Internet Explorer 5.5), if I have more than 4 or 5 images (currently I have one page with 12 GIF images), sometimes not all the pictures show up. If I reload the page, the problem is often fixed. I have seen similar situations both with static images and dynamic images (images generated by Python programs.) I am not sure whether the problem is in the browser, in the Zope server, or in my ISP. Has anyone seen something similar? regards, Hung Jung - PS- related to this, I also know that for Zope 2.1.x there is some thread competing write problem: when two threads (from different browser windows) compete in writing, one browser window does not receive any response. I know Zope is supposed to abort one of the threads and restart it, and matter of fact I do see that happen when I insert print statements. But it's just strange that the browser window does not display anything. This problem reportedly happens with Zope 2.1.6 and 2.1.x, both on Linux and Windows, with IE5 and Netscape browsers alike. This could be a different problem, though. _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] Zope Hosting in .au
Yes. Adroit Internet Solutions. www.adroit.net Daniel Harris wrote: Hi, Are there any organisations in .au that offer Zope hosting? Thanks, Daniel. ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev ) -- Terry Kerr ([EMAIL PROTECTED]) Adroit Internet Solutions Pty Ltd (www.adroit.net) Phone: +613 9563 4461 Fax: +613 9563 3856 Mobile: +61 414 708 124 ICQ: 79303381 ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
[Zope] Zope Hosting in .au
Hi, Are there any organisations in .au that offer Zope hosting? Thanks, Daniel. ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
