RE: [Zope] zserver blocking behavior with a slow request
Jim Abramson wrote at 2005-8-3 14:57 -0400: > ... >Interesting. Are you aware if your colleagues' was a python(/dcoracle2) >app? Yes -- on Windows (I think) -- Dieter ___ 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 )
RE: [Zope] zserver blocking behavior with a slow request
> >I have 8 zserver threads and a ZODB pool size of 10. I'm fairly > >certain I'm not maxing these out. So is this blocking effect just > >expected behavior for zope? > > No, there should be no blocking. > > > Although some colleagues reported similar behaviour with a > (non Zope/ZServer) multithreaded application connecting to Oracle. > > They could not yet find the cause of their problem... > Interesting. Are you aware if your colleagues' was a python(/dcoracle2) app? thx Jim ___ 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 )
RE: [Zope] zserver blocking behavior with a slow request
> > I'm finding that once a user requests a page which runs a > particularly slow sql (say up to 5 minutes), > any other > subsequent requests seem to take the hit as well, and return > very slowly. > Take a look at DadlockDebugger product - you'll see what is > happening with your Zope threads. > Thanks, this looks quite handy, I am going to give it a whirl (I assume that threadframe module dependency hasn't yet hosed anyone's Linux machine - funny how a disclaimer can inspire paranoia) > Isn't it better idea to execute long running query outside of > zope - external method or sth, and only check for results > even with simple page reload? We did something like this with > pdf generation and this worked as expected, but of course you > need some additional work to create such thing. > Yes I agree, in my case those SELECTs aren't *supposed* to be taking 5 minutes. That's a separate problem. However when such a problem bites I don't want all of my users to suffer, just the unlucky one who requested the doomed sql to be run. > > So is this blocking effect just expected behavior for zope? > We are using Zope and Oracle too, and even 10 threads... and > I didn't noticed something like this. What is your processor > doing then? What is the CPU(s?) load. The single CPU isn't loaded at all. But if DeadlockDebugger doesn't turn up any good clues I will do some investigating at the system level. Thanks for advice, Jim ___ 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 )
Re: [Zope] zserver blocking behavior with a slow request
Jim Abramson wrote at 2005-8-2 13:07 -0400: > ... >I have 8 zserver threads and a ZODB pool size of 10. I'm fairly certain >I'm not maxing these out. So is this blocking effect just expected >behavior for zope? No, there should be no blocking. Although some colleagues reported similar behaviour with a (non Zope/ZServer) multithreaded application connecting to Oracle. They could not yet find the cause of their problem... -- Dieter ___ 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 )
Re: [Zope] zserver blocking behavior with a slow request
> I'm finding that once a user requests a page which runs a particularly slow sql (say up to 5 minutes), > any other subsequent requests seem to take the hit as well, and return very slowly. Take a look at DadlockDebugger product - you'll see what is happening with your Zope threads. Isn't it better idea to execute long running query outside of zope - external method or sth, and only check for results even with simple page reload? We did something like this with pdf generation and this worked as expected, but of course you need some additional work to create such thing. > So is this blocking effect just expected behavior for zope? We are using Zope and Oracle too, and even 10 threads... and I didn't noticed something like this. What is your processor doing then? What is the CPU(s?) load. -- Maciej Wisniowski ___ 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 )
Re: [Zope] zserver blocking behavior with a slow request
Jim, What platform is this on? and is it a uni or multi-processor system. I did a bit of studying a long time ago into performance of Solaris with python: http://www.zope.org/Members/glpb/solaris not sure how relevant it is now, but if you are running on an old solaris box there might be some hints there. -Matt Jim Abramson wrote: On a production Zope (2.7.6) running behind apache and connected to an Oracle database, I'm finding that once a user requests a page which runs a particularly slow sql (say up to 5 minutes), any other subsequent requests seem to take the hit as well, and return very slowly. I have 8 zserver threads and a ZODB pool size of 10. I'm fairly certain I'm not maxing these out. So is this blocking effect just expected behavior for zope? One point of note is that the requests passed from apache all bear the remote ip of 127.0.0.1. Could zserver be throttling the incoming requests due to their identical REMOTE_IP (or some other apache configuration detail)? Is there anything else I should investigate? -- Matt Hamilton [EMAIL PROTECTED] Netsight Internet Solutions, Ltd.Business Vision on the Internet http://www.netsight.co.uk +44 (0)117 9090901 Web Design | Zope/Plone Development & Consulting | Co-location | Hosting ___ 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 )
[Zope] zserver blocking behavior with a slow request
Title: zserver blocking behavior with a slow request On a production Zope (2.7.6) running behind apache and connected to an Oracle database, I'm finding that once a user requests a page which runs a particularly slow sql (say up to 5 minutes), any other subsequent requests seem to take the hit as well, and return very slowly. I have 8 zserver threads and a ZODB pool size of 10. I'm fairly certain I'm not maxing these out. So is this blocking effect just expected behavior for zope? One point of note is that the requests passed from apache all bear the remote ip of 127.0.0.1. Could zserver be throttling the incoming requests due to their identical REMOTE_IP (or some other apache configuration detail)? Is there anything else I should investigate? OH btw, I am using my own connection pool and managing db interface / transactions manually, so ZSQL should not be considered a culprit. Furthermore I'm watching the connections/pool themselves and they are not maxed either. Thanks for any help. Jim ___ 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 )
