[opencms-dev] OpenCMS hangs under heavy load

[Mark Belanger]

Here's what we're running:

  RHEL - 2.4.21.0.1.ELsmp kernel
  OpenCMS 5.0.1
  Tomcat 4.1.31
  J2SDK 1.4.2_06
  MySQL Standard 4.0.22

Nothing odd in the logs, other than the last user that logged in to 
publish.  It might be the DB, but I doubt it.  The load is always 
minimal.  The connection on the other hand is a different story.  I know 
our Java is a bit out of date, but I was hoping someone had seen this 
behavior before I resort to upgrading everything and waiting for the 
failure condition to occur.

Thanks much for the thoughts.


-MB

Joe Desbonnet wrote:
> You say it happens only when content is modified (write to database).
> I wonder could it be a JDBC or database issue.
> 
> What database / version are you using? What JDBC driver? Also what
> patch level of JDK 1.4.2 are you using? (I believe 1.4.2_08 is the
> latest version).   Maybe try Java 1.5.0 and see if that makes any
> difference.
> 
> How about the log files (webapps/opencms/WEB-INF/logs/opencms.log) --
> any clues there?
> 
> Joe.
> 
> 
> On 7/8/05, Mark Belanger <belanger at fluid.com> wrote:
> 
>>I mispoke.  I meant threads instead of processes.  Otherwise, the
>>symptoms remain.  Furthermore, I should have clarified the fact that the
>>system is a dual processor unit with 2.4Ghz processors and 2G of RAM.
>>
>>It's killing us as we have to effectively shut down access to the site
>>in order to republish any content.
>>
>>
>>-MB
>>
>>Joe Desbonnet wrote:
>>
>>>That's odd -- Tomcat would normally occupy just one process -- so if
>>>there are two processes running perhaps a second instance of Tomcat
>>>has been started somehow. I've seen this sort of thing before with
>>>another application. Can you verify that both processes are running
>>>Tomcat? If so can you think of any mechanism that would cause a second
>>>instance of Tomcat to start?
>>>
>>>Joe.
>>>
>>>
>>>
>>>On 7/7/05, Mark Belanger <belanger at fluid.com> wrote:
>>>
>>>
>>>
>>>>when the load is lower in the evening.  On a hang, what is normally a
>>>>single Java process consuming about 50% of the CPU becomes two Java
>>>>processes consuming ~25% each.  At this point, the load shoots up to 2+
>>>>and the dynamic portions of the site become totally unresponsive for
>>>>anywhere between 2 and 5 minutes.
>>>>
>>>
>>>
>>>
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>>
>>--
>>_______________________________________________________________________
>>Mark Belanger - belanger at fluid.com
>>

-- 
_______________________________________________________________________
Mark Belanger - belanger at fluid.com