Dennis, As far as resource problems go ... Did you check the swap ? Is it used, and if so by how much ? I was experiencing the same thing, only it would stop responding for up to several minutes, sometimes even long enough that I was just not willing to wait, so I had to restart it. I had 1GB of RAM, and the swap was holding 600-700K ... I surmised that maybe the waits occured when swapped out information had to be brought back or something ... So I added another GB of RAM, and now all problems have gone away. If that's not it, I'd look at increasing your thread count, maybe all your threads get locked long enough for the users to notice, due to long running actions ... The check interval could be looked at since you're on SMP. Since I had lots of spare CPU cycles, I set it to 0 myself, and that makes Zope very very responsive if you can spare the CPU power ... it's great! Python 2.3.1 and a beta zope also could be a problem, wasn't there issues/bugs with that ? Python 2.6.2 or 2.6.3 were officially support 2.1 ... I successfully used it with 2.2 for a while, but could never get it to run with 2.3.1 (Wouldn't even compile !). You might want to look into the 2.7/2.3.3 combo, it's been working very well for me as far as performance and stability. Good luck ! J.F. -----Original Message----- From: zope-bounces@zope.org [mailto:zope-bounces@zope.org]On Behalf Of Dennis Allison Sent: Monday, March 22, 2004 4:44 AM To: zope@zope.org Subject: [Zope] strange performance problem This has the characteristics of a network problem, but it may be somewhere else. Users report that the system just seems to stop responding for a few seconds, then recovers. Of course, I've not been able to reproduce the problem nor isolate a command sequence that triggers it, but I am convinced that it's real. This, BTW, happens on a lightly loaded machine with no apparent resource problems. Any thoughts, pointers, or techniques to isolate the problem would be appreciated. Oh, yes, the environment.. Dual Athlon Barton Stepping CPUs AMD2600, Tyan Tiger Motherboard, 4GB memory, 4x120 3Ware RAID 10, ethernet feed. RH7.3 OS, Python 2.3.1, Zope 2.6.2b3. Any help appreciate. -dra _______________________________________________ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
Thanks for the assist. Swap: I doubt it, but it's worth checking. It runs at 44MB or so at the moment out of 2GB allocated. RAM: Currently I have 4GB installed using whatever RH 7.3 believes is the right memory model--I believe they use the 1GB system, 3GB user model with my resource configuration. Threads: I currently am running 8 threads per Zope, but there are multiple instances of Zope. I rarely see more than four threads active. CPU utilization has occasional peaks, but typically is under 5% on both CPUs. Check Interval: I have not dorked with the check interval. I'll try dropping it. I'd guess it will improve responsiveness but not resolve this problem. Zope & Python: The Python 2.1.3 and Zope 2.6.2b3 are not likely to be the problem here. That's one of the stable configurations. I plan to move to Zope 2.6.4 and Python 2.3.3 when I feel I can do it safely on a production system. I may even go to Zope 2.7 but there's greater risk moving a live system which cannot accept downtime. ZEO?: I don't currently use ZEO. Should I be using it? Thanks. -d On Mon, 22 Mar 2004 Jean-Francois.Doyon@CCRS.NRCan.gc.ca wrote:
Dennis,
As far as resource problems go ... Did you check the swap ? Is it used, and if so by how much ?
I was experiencing the same thing, only it would stop responding for up to several minutes, sometimes even long enough that I was just not willing to wait, so I had to restart it.
I had 1GB of RAM, and the swap was holding 600-700K ... I surmised that maybe the waits occured when swapped out information had to be brought back or something ... So I added another GB of RAM, and now all problems have gone away.
If that's not it, I'd look at increasing your thread count, maybe all your threads get locked long enough for the users to notice, due to long running actions ...
The check interval could be looked at since you're on SMP. Since I had lots of spare CPU cycles, I set it to 0 myself, and that makes Zope very very responsive if you can spare the CPU power ... it's great!
Python 2.3.1 and a beta zope also could be a problem, wasn't there issues/bugs with that ? Python 2.6.2 or 2.6.3 were officially support 2.1 ... I successfully used it with 2.2 for a while, but could never get it to run with 2.3.1 (Wouldn't even compile !). You might want to look into the 2.7/2.3.3 combo, it's been working very well for me as far as performance and stability.
Good luck ! J.F.
-----Original Message----- From: zope-bounces@zope.org [mailto:zope-bounces@zope.org]On Behalf Of Dennis Allison Sent: Monday, March 22, 2004 4:44 AM To: zope@zope.org Subject: [Zope] strange performance problem
This has the characteristics of a network problem, but it may be somewhere else. Users report that the system just seems to stop responding for a few seconds, then recovers. Of course, I've not been able to reproduce the problem nor isolate a command sequence that triggers it, but I am convinced that it's real. This, BTW, happens on a lightly loaded machine with no apparent resource problems.
Any thoughts, pointers, or techniques to isolate the problem would be appreciated.
Oh, yes, the environment.. Dual Athlon Barton Stepping CPUs AMD2600, Tyan Tiger Motherboard, 4GB memory, 4x120 3Ware RAID 10, ethernet feed. RH7.3 OS, Python 2.3.1, Zope 2.6.2b3.
Any help appreciate. -dra
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participants (2)
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Dennis Allison -
Jean-Francois.Doyon＠CCRS.NRCan.gc.ca