Re: [Mod-fcgid-users] Fwd: mod_fcgid with php CGI hangs on interrupted downloads
Evening, I have finally identified part of the problem, although I'm not quite sure why it occurs when using fcgid and not when using mod_php. The problem is related to the locking of the PHP session; I noticed that the locking problem didn't occur if I didn't start the session, so further checking led me to this post on the PHP site - http://www.php.net/manual/en/ref.session.php#64525. The upshot is that calling session_write_close() before outputting the file appears to resolve the problem for fcgid. Thanks for your help folks. Liam On Wed, Feb 23, 2011 at 11:19 AM, Josiah Purtlebaugh wrote: > Liam, > > I was misunderstanding your issue. In this instance, I might suggest > *lowering* your IPCCommTimeout variable, though it might have a negative > effect on longer downloads. > > Other than that, I don't think I have the experience necessary to solve this; > you might require some change to the fcgid codebase in order to change > timeout behavior or be more proactive on checking the socket state... > > Josiah Purtlebaugh > josiah.purtleba...@gmail.com > +1 253 797 4233 > > On Feb 22, 2011, at 3:01 PM, Liam O'Boyle wrote: > >> Morning, >> >> They hang whenever interrupted; if a download would have taken 2 >> seconds and I cancel it, then the PHP process will hang until the >> timeout is reached; the same behaviour is observed with files of all >> sizes. >> >> Liam >> >> On Wed, Feb 23, 2011 at 9:46 AM, Josiah Purtlebaugh >> wrote: >>> Liam, >>> >>> Someone else commented that you should increase the value of your >>> IPCCommTimeout setting; I'd recommend this as well, though I have to ask, >>> as these uploads taking multiple minutes to complete or do they hang fairly >>> quickly? >>> >>> Josiah Purtlebaugh >>> josiah.purtleba...@gmail.com >>> +1 253 797 4233 >>> >>> On Feb 22, 2011, at 6:03 AM, Liam O'Boyle wrote: >>> >>>> Hi Josiah, >>>> >>>> There was a strace snippet in the linked serverfault page, as follows >>>> >>>> root@some-machine:~# strace -p 24837 >>>> Process 24837 attached - interrupt to quit >>>> write(3, >>>> "\5|A\313%\35\337\376\275\237\230\266\242\371\37YjzD<\322\215\357\336:M\362P\335\242\214\341"..., >>>> 17432 >>>> >>>> Just hanging on that, or something like it, each time. I assume this >>>> is blocking trying to write back to the fcgid handler. >>>> >>>> Thanks, >>>> Liam >>>> >>>> On Tue, Feb 22, 2011 at 12:12 PM, Josiah Purtlebaugh >>>> wrote: >>>>> I don't have any solutions for you, but I'd recommend trying to discover >>>>> where or why it's hanging. The tool 'strace' would be most useful in >>>>> figuring this out. >>>>> >>>>> The ideas that come to mind off the top of my head are problems with file >>>>> size, the memory of the child processes, or something like that. A dump >>>>> of the php-cgi process might lead to you figuring out the true issue, >>>>> though. >>>>> >>>>> Josiah Purtlebaugh >>>>> josiah.purtleba...@gmail.com >>>>> +1 253 797 4233 >>>>> >>>>> On Feb 21, 2011, at 4:12 PM, Liam O'Boyle wrote: >>>>> >>>>>> Morning, >>>>>> >>>>>> I still haven't had any luck addressing this problem; I'm posting this >>>>>> in the hope that someone has some sort of idea, otherwise I will have >>>>>> to scrap mod_fcgid and revert to mod_php this evening, as this is >>>>>> causing considerable problems for our users. >>>>>> >>>>>> Thanks for any assistance, >>>>>> >>>>>> Liam >>>>>> >>>>>> >>>>>> -- Forwarded message -- >>>>>> From: Liam O'Boyle >>>>>> Date: Tue, Feb 8, 2011 at 4:46 PM >>>>>> Subject: mod_fcgid with php CGI hangs on interrupted downloads >>>>>> To: mod-fcgid-users@lists.sourceforge.net >>>>>> >>>>>> >>>>>> Hi there, >>>>>> >>>>>> I'm having an issue with downloads through PHP when using mod_fcgid; >>>>>> if the download is interrupted before it's co
Re: [Mod-fcgid-users] Fwd: mod_fcgid with php CGI hangs on interrupted downloads
Morning, They hang whenever interrupted; if a download would have taken 2 seconds and I cancel it, then the PHP process will hang until the timeout is reached; the same behaviour is observed with files of all sizes. Liam On Wed, Feb 23, 2011 at 9:46 AM, Josiah Purtlebaugh wrote: > Liam, > > Someone else commented that you should increase the value of your > IPCCommTimeout setting; I'd recommend this as well, though I have to ask, as > these uploads taking multiple minutes to complete or do they hang fairly > quickly? > > Josiah Purtlebaugh > josiah.purtleba...@gmail.com > +1 253 797 4233 > > On Feb 22, 2011, at 6:03 AM, Liam O'Boyle wrote: > >> Hi Josiah, >> >> There was a strace snippet in the linked serverfault page, as follows >> >> root@some-machine:~# strace -p 24837 >> Process 24837 attached - interrupt to quit >> write(3, >> "\5|A\313%\35\337\376\275\237\230\266\242\371\37YjzD<\322\215\357\336:M\362P\335\242\214\341"..., >> 17432 >> >> Just hanging on that, or something like it, each time. I assume this >> is blocking trying to write back to the fcgid handler. >> >> Thanks, >> Liam >> >> On Tue, Feb 22, 2011 at 12:12 PM, Josiah Purtlebaugh >> wrote: >>> I don't have any solutions for you, but I'd recommend trying to discover >>> where or why it's hanging. The tool 'strace' would be most useful in >>> figuring this out. >>> >>> The ideas that come to mind off the top of my head are problems with file >>> size, the memory of the child processes, or something like that. A dump of >>> the php-cgi process might lead to you figuring out the true issue, though. >>> >>> Josiah Purtlebaugh >>> josiah.purtleba...@gmail.com >>> +1 253 797 4233 >>> >>> On Feb 21, 2011, at 4:12 PM, Liam O'Boyle wrote: >>> >>>> Morning, >>>> >>>> I still haven't had any luck addressing this problem; I'm posting this >>>> in the hope that someone has some sort of idea, otherwise I will have >>>> to scrap mod_fcgid and revert to mod_php this evening, as this is >>>> causing considerable problems for our users. >>>> >>>> Thanks for any assistance, >>>> >>>> Liam >>>> >>>> >>>> -- Forwarded message -- >>>> From: Liam O'Boyle >>>> Date: Tue, Feb 8, 2011 at 4:46 PM >>>> Subject: mod_fcgid with php CGI hangs on interrupted downloads >>>> To: mod-fcgid-users@lists.sourceforge.net >>>> >>>> >>>> Hi there, >>>> >>>> I'm having an issue with downloads through PHP when using mod_fcgid; >>>> if the download is interrupted before it's complete, the php-cgi >>>> process seems to block until the execution timeout is reached, rather >>>> than aborting immediately. Further requests to the server by the >>>> same user that interrupted the download hang until the process aborts >>>> and the php-cgi process starts serving more requests, but requests by >>>> other users do not appear to be affected. >>>> >>>> It doesn't appear to be a PHP problem, as the same code, when run >>>> using mod_php, executes correctly. >>>> >>>> Does anyone have any suggestions that I could look into to fix this? >>>> >>>> A full explanation is up on ServerFault - >>>> http://serverfault.com/questions/226464/php-fcgid-hangs-if-download-interrupted >>>> >>>> Thanks for any help, >>>> >>>> Liam >>>> >>>> -- >>>> Index, Search & Analyze Logs and other IT data in Real-Time with Splunk >>>> Collect, index and harness all the fast moving IT data generated by your >>>> applications, servers and devices whether physical, virtual or in the >>>> cloud. >>>> Deliver compliance at lower cost and gain new business insights. >>>> Free Software Download: http://p.sf.net/sfu/splunk-dev2dev >>>> ___ >>>> Mod-fcgid-users mailing list >>>> Mod-fcgid-users@lists.sourceforge.net >>>> https://lists.sourceforge.net/lists/listinfo/mod-fcgid-users >>> >>> >>> ---
Re: [Mod-fcgid-users] Fwd: mod_fcgid with php CGI hangs on interrupted downloads
Hi Josiah, There was a strace snippet in the linked serverfault page, as follows root@some-machine:~# strace -p 24837 Process 24837 attached - interrupt to quit write(3, "\5|A\313%\35\337\376\275\237\230\266\242\371\37YjzD<\322\215\357\336:M\362P\335\242\214\341"..., 17432 Just hanging on that, or something like it, each time. I assume this is blocking trying to write back to the fcgid handler. Thanks, Liam On Tue, Feb 22, 2011 at 12:12 PM, Josiah Purtlebaugh wrote: > I don't have any solutions for you, but I'd recommend trying to discover > where or why it's hanging. The tool 'strace' would be most useful in figuring > this out. > > The ideas that come to mind off the top of my head are problems with file > size, the memory of the child processes, or something like that. A dump of > the php-cgi process might lead to you figuring out the true issue, though. > > Josiah Purtlebaugh > josiah.purtleba...@gmail.com > +1 253 797 4233 > > On Feb 21, 2011, at 4:12 PM, Liam O'Boyle wrote: > >> Morning, >> >> I still haven't had any luck addressing this problem; I'm posting this >> in the hope that someone has some sort of idea, otherwise I will have >> to scrap mod_fcgid and revert to mod_php this evening, as this is >> causing considerable problems for our users. >> >> Thanks for any assistance, >> >> Liam >> >> >> -- Forwarded message -- >> From: Liam O'Boyle >> Date: Tue, Feb 8, 2011 at 4:46 PM >> Subject: mod_fcgid with php CGI hangs on interrupted downloads >> To: mod-fcgid-users@lists.sourceforge.net >> >> >> Hi there, >> >> I'm having an issue with downloads through PHP when using mod_fcgid; >> if the download is interrupted before it's complete, the php-cgi >> process seems to block until the execution timeout is reached, rather >> than aborting immediately. Further requests to the server by the >> same user that interrupted the download hang until the process aborts >> and the php-cgi process starts serving more requests, but requests by >> other users do not appear to be affected. >> >> It doesn't appear to be a PHP problem, as the same code, when run >> using mod_php, executes correctly. >> >> Does anyone have any suggestions that I could look into to fix this? >> >> A full explanation is up on ServerFault - >> http://serverfault.com/questions/226464/php-fcgid-hangs-if-download-interrupted >> >> Thanks for any help, >> >> Liam >> >> -- >> Index, Search & Analyze Logs and other IT data in Real-Time with Splunk >> Collect, index and harness all the fast moving IT data generated by your >> applications, servers and devices whether physical, virtual or in the cloud. >> Deliver compliance at lower cost and gain new business insights. >> Free Software Download: http://p.sf.net/sfu/splunk-dev2dev >> ___ >> Mod-fcgid-users mailing list >> Mod-fcgid-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/mod-fcgid-users > > > -- > Index, Search & Analyze Logs and other IT data in Real-Time with Splunk > Collect, index and harness all the fast moving IT data generated by your > applications, servers and devices whether physical, virtual or in the cloud. > Deliver compliance at lower cost and gain new business insights. > Free Software Download: http://p.sf.net/sfu/splunk-dev2dev > ___ > Mod-fcgid-users mailing list > Mod-fcgid-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/mod-fcgid-users > -- Index, Search & Analyze Logs and other IT data in Real-Time with Splunk Collect, index and harness all the fast moving IT data generated by your applications, servers and devices whether physical, virtual or in the cloud. Deliver compliance at lower cost and gain new business insights. Free Software Download: http://p.sf.net/sfu/splunk-dev2dev ___ Mod-fcgid-users mailing list Mod-fcgid-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mod-fcgid-users
[Mod-fcgid-users] Fwd: mod_fcgid with php CGI hangs on interrupted downloads
Morning, I still haven't had any luck addressing this problem; I'm posting this in the hope that someone has some sort of idea, otherwise I will have to scrap mod_fcgid and revert to mod_php this evening, as this is causing considerable problems for our users. Thanks for any assistance, Liam -- Forwarded message ------ From: Liam O'Boyle Date: Tue, Feb 8, 2011 at 4:46 PM Subject: mod_fcgid with php CGI hangs on interrupted downloads To: mod-fcgid-users@lists.sourceforge.net Hi there, I'm having an issue with downloads through PHP when using mod_fcgid; if the download is interrupted before it's complete, the php-cgi process seems to block until the execution timeout is reached, rather than aborting immediately. Further requests to the server by the same user that interrupted the download hang until the process aborts and the php-cgi process starts serving more requests, but requests by other users do not appear to be affected. It doesn't appear to be a PHP problem, as the same code, when run using mod_php, executes correctly. Does anyone have any suggestions that I could look into to fix this? A full explanation is up on ServerFault - http://serverfault.com/questions/226464/php-fcgid-hangs-if-download-interrupted Thanks for any help, Liam -- Index, Search & Analyze Logs and other IT data in Real-Time with Splunk Collect, index and harness all the fast moving IT data generated by your applications, servers and devices whether physical, virtual or in the cloud. Deliver compliance at lower cost and gain new business insights. Free Software Download: http://p.sf.net/sfu/splunk-dev2dev ___ Mod-fcgid-users mailing list Mod-fcgid-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mod-fcgid-users
[Mod-fcgid-users] mod_fcgid with php CGI hangs on interrupted downloads
Hi there, I'm having an issue with downloads through PHP when using mod_fcgid; if the download is interrupted before it's complete, the php-cgi process seems to block until the execution timeout is reached, rather than aborting immediately. Further requests to the server by the same user that interrupted the download hang until the process aborts and the php-cgi process starts serving more requests, but requests by other users do not appear to be affected. It doesn't appear to be a PHP problem, as the same code, when run using mod_php, executes correctly. Does anyone have any suggestions that I could look into to fix this? A full explanation is up on ServerFault - http://serverfault.com/questions/226464/php-fcgid-hangs-if-download-interrupted Thanks for any help, Liam -- The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE: Pinpoint memory and threading errors before they happen. Find and fix more than 250 security defects in the development cycle. Locate bottlenecks in serial and parallel code that limit performance. http://p.sf.net/sfu/intel-dev2devfeb ___ Mod-fcgid-users mailing list Mod-fcgid-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mod-fcgid-users
