[phpa] Re: phpa on FreeBSD - segfault

Hi Nick,

Thanx for your advices, they were very usefull. As you suggested, segmentation
fault problems were due to the ezpublish's file caching system, I simply
excluded them from phpa caching, and now all runs well.

Thanx again.

le Mon, 19 Nov 2001 18:10:40 +0000
 "PHP Accelerator" <php_accelerator@xxxxxxxxxxx> écrivait:
> 
> Thanks for the info Julien.
> 
> The first thing then is that the shm cache is too small, and this will 
> degrade performance. A rough guide for setting the size is to total up the 
> size of the phpa_* files in MB's, add a couple more, and use that value. If 
> you're not sure then just set it as 32.
> 
> If ezpublish keeps creating new files or replacing files (i.e. a new file as 
> opposed to overwriting an old file), then reducing the ttl value from 12 
> hours, perhaps by quite a lot, so that the shm cache flushes out stale files 
> sooner would be a good idea. If it was a known set of files then you could 
> instead configure phpa to not cache those files, and in 1.2, to just use the 
> file cache and not the shm cache for them.
> 
> When Jamies made the port I'd be keen for you to try that, also with 4Mb for 
> the size (the default is now 8 with 1.2), and see if you still get a crash.
> 
> If array functions are used much then if you can switch PHP versions I'd 
> really recommend 4.0.7RC3. It's more stable and is also faster, and it makes 
> sense to rule that out if possible.
> 
> Depending on time, I'm aiming to also include a simple cache manager tool in 
> release 1.2 that will help giving an idea on cache usage and sizing.
> 
> Nick
> 
> >From: "julien maerten" <julien@xxxxxxxxx>
> >Reply-To: phpa@xxxxxxxxxxxxx
> >To: <phpa@xxxxxxxxxxxxx>
> >Subject: [phpa] Re: phpa on FreeBSD - segfault
> >Date: Mon, 19 Nov 2001 16:53:14 +0100
> >
> >
> >Hi,
> >
> >     Here is an example of what I get at the moment, with logging enabled :
> >
> >phpa-c0-shm: (12427) Cache full - dropping
> >/space1/ez/ezbulkmail/classes/ezbulkmailcategorysettings.php to free space
> >phpa-c0-shm: (12427) Cache full - dropping
> >/space1/ez/eztrade/classes/ezoption.php to free space
> >phpa-c0-shm: (12427) Cache full - dropping
> >/space1/ez/eztrade/classes/ezoptionvalue.php to free space
> >[Mon Nov 19 16:39:45 2001] [notice] child pid 12427 exit signal 
> >Segmentation
> >fault (11)
> >[Mon Nov 19 16:40:05 2001] [notice] child pid 12430 exit signal 
> >Segmentation
> >fault (11)
> >[Mon Nov 19 16:40:18 2001] [notice] child pid 12418 exit signal 
> >Segmentation
> >fault (11)
> >[Mon Nov 19 16:40:27 2001] [notice] child pid 12419 exit signal 
> >Segmentation
> >fault (11)
> >[Mon Nov 19 16:40:34 2001] [notice] child pid 12411 exit signal 
> >Segmentation
> >fault (11)
> >phpa-c0-shm: (12433) Cache full - dropping
> >/space1/ez/ezarticle/admin/articlelist.php to free space
> >[Mon Nov 19 16:40:40 2001] [notice] child pid 12433 exit signal 
> >Segmentation
> >fault (11)
> >
> >     Here is my shm config :
> >
> >julien@beta at 16:37 
> >/home/julien/tmp/php_accelerator_1.1p1_4.0.6_freebsd4.3
> > > sysctl -a | grep shm
> >kern.ipc.shmmax: 33554432
> >kern.ipc.shmmin: 1
> >kern.ipc.shmmni: 192
> >kern.ipc.shmseg: 128
> >kern.ipc.shmall: 32768
> >kern.ipc.shm_use_phys: 0
> >
> >     And my php.ini :
> >
> >zend_extension = /usr/local/lib/php_accelerator.so
> >phpa.c0_size = 4
> >phpa.cache_dir = /tmp
> >phpa.c0_logging = on
> >phpa.c0_stats_check_period = 5m
> >phpa.c0_ttl = 12h
> >
> >
> >
> >----- Original Message -----
> >From: "PHP Accelerator" <php_accelerator@xxxxxxxxxxx>
> >To: <phpa@xxxxxxxxxxxxx>
> >Sent: Monday, November 19, 2001 4:29 PM
> >Subject: [phpa] Re: phpa on FreeBSD - segfault
> >
> >
> > >
> > > Hi,
> > >
> > > Julien wrote:
> > > >     This segfault happens when getting pages from a site made with
> > > >ezpublish, a php content manager that make a quite complex use of php.
> >This
> > > >problem seems to be quite minor, as the website continues to run
> >correctly
> > > >( but really more quickly ;-)) ).
> > >
> > > Before the segfault does it actually run more quickly without phpa then?
> >:-)
> > > If so then enable shm logging and see if the cache is flushing pages. 
> >The
> > > cache could be too small.
> > >
> > > When Jamie's produced the FreeBSD release for 1.2dev then I'll put that 
> >up
> > > and I'd recommend trying that.
> > >
> > > >     One of the particularities of ezpublish is an intensive use of
> > > >references ( ie foo =& bar ), could it be related to my problem ?
> > >
> > > Certainly possible, but my own code uses references heavily too and it
> >never
> > > crashes. If you're not using 4.0.7 then I'd recommend switching to that 
> >as
> > > 4.0.6 has some memory bugs that could also be related.
> > >
> > > >     As I said, ezpublish is a quite big amount of code, so tracking 
> >the
> > > >bug may take some time...
> > >
> > > Would certainly be helpful if you can, but I'd be inclined to hold off
> >until
> > > Jamies had time to build 1.2dev and let me have that. One other thing 
> >you
> > > could do is set the (undocumented) phpa.tweaks setting to 'off' in 
> >php.ini
> > >
> > > Cheers
> > > Nick
> > >
> > >
> > > _________________________________________________________________
> > > Get your FREE download of MSN Explorer at 
> >http://explorer.msn.com/intl.asp
> > >
> > > ------------------------------------------------------------------------
> > >   www.php-accelerator.co.uk           Home of the free PHP Accelerator
> > >
> > > To post, send email to phpa@xxxxxxxxxxxxx
> > > To unsubscribe, email phpa-request@xxxxxxxxxxxxx with subject 
> >unsubscribe
> > >
> > >
> > >
> >
> >------------------------------------------------------------------------
> >   www.php-accelerator.co.uk           Home of the free PHP Accelerator
> >
> >To post, send email to phpa@xxxxxxxxxxxxx
> >To unsubscribe, email phpa-request@xxxxxxxxxxxxx with subject unsubscribe
> >
> >
> 
> 
> _________________________________________________________________
> Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp
> 
> ------------------------------------------------------------------------
>   www.php-accelerator.co.uk           Home of the free PHP Accelerator
> 
> To post, send email to phpa@xxxxxxxxxxxxx
> To unsubscribe, email phpa-request@xxxxxxxxxxxxx with subject unsubscribe
> 
> 


--
-------------------------------
--> julien@xxxxxxxxx
-------------------------------
------------------------------------------------------------------------
  www.php-accelerator.co.uk           Home of the free PHP Accelerator

To post, send email to phpa@xxxxxxxxxxxxx
To unsubscribe, email phpa-request@xxxxxxxxxxxxx with subject unsubscribe

Other related posts: