tomcat-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Ronald Klop <ronald-mailingl...@base.nl>
Subject Re: NIO 100% CPU usage
Date Thu, 16 Oct 2008 11:16:32 GMT
Filip,

How do your top or ps commands relate to threads in the thread dump?
Are there shared ids or shared names in there?

I'm searching for this for some time, so am really interested in what you mean.

Ronald.


Op woensdag, 15 oktober 2008 om 20:22 uur schreef Tomcat Users List <users@tomcat.apache.org>:
> 
> 
> Subject: Re: NIO 100% CPU usage
> Date: Wed Oct 15 20:22:43 CEST 2008
> From: Filip Hanik - Dev Lists <devlists@hanik.com>
> 
> 
> ok, when you reproduce it, you don't really need a profiler,
> you can do a top with threads on, or a ps -efL, and from those, you can look into a thread
dump
> 
> I've never been able to reproduce the issue, so if you have a system, or if you want
to work with me, ping me offline at fhanik at apache dot org
> 
> Filip
> 
> 
> Matías Rojas wrote:
> > It's 6.0.18
> >
> > -----Original Message-----
> > From: Filip Hanik - Dev Lists [mailto:devlists@hanik.com] > Sent: miércoles,
15 de octubre de 2008 07:25 p.m.
> > To: Tomcat Users List
> > Subject: Re: NIO 100% CPU usage
> >
> > what version of tomcat are you using?
> >
> > Filip
> >
> > Matías Rojas wrote:
> >   
> >> Hi Filip,
> >> Thanks for your response.
> >> I can only reproduce it on production, where we are running a Linux 2.6
> >> Kernel with JDK 6 update 7. After a high load it is still running at 100%
> >> CPU usage (sometimes 200% or 300% taking 2 or 3 cores).
> >> Today I'll try to do some profiling to detect the exact cause, but the bug
> >>     
> > I
> >   
> >> mentioned before sound like a possible cause to me.
> >> I understand that you said that the bug is not fixed in JDK 6 update 7?
> >> It's strange because here
> >> http://java.sun.com/javase/6/webnotes/ReleaseNotes.html it says that the
> >>     
> > bug
> >   
> >> is fixed.
> >>
> >> Thanks,
> >> Matías
> >>
> >> -----Original Message-----
> >> From: Filip Hanik - Dev Lists [mailto:devlists@hanik.com] >> Sent: martes,
14 de octubre de 2008 08:16 p.m.
> >> To: Tomcat Users List
> >> Subject: Re: NIO 100% CPU usage
> >>
> >> hi Matías,
> >>
> >> I have not yet found a way to reproduce it to put in a work around so >>
even though its not fixed in 1.5 and 1.6, we can make it work.
> >> If you want to work with me, we can make that happen, assuming you have >>
a way to reproduce this
> >>
> >> Filip
> >>
> >> Matías Rojas wrote:
> >>   
> >>     
> >>> Hello,
> >>>
> >>> I'm experiencing a problem with NIO in Tomcat, maybe related to this
> >>>     
> >>>       
> >> issue:
> >>   
> >>     
> >>>  
> >>>
> >>> Selector doesn't block on Selector.select(timeout) (lnx) >>>
> >>> http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6403933
> >>>
> >>>  
> >>>
> >>> I'm using JDK 6 update 7 and it seems not to be fixed, does anybody have
> >>>     
> >>>       
> >> the
> >>   
> >>     
> >>> same problem?
> >>>
> >>> When in heavy load, CPU usage goes to 100% and the only way to go back to
> >>> normal is restarting Tomcat.
> >>>
> >>>  
> >>>
> >>> Thanks,
> >>>
> >>> Matías
> >>>
> >>>
> >>>   
> >>>     
> >>>       
> >> ---------------------------------------------------------------------
> >> To start a new topic, e-mail: users@tomcat.apache.org
> >> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> >> For additional commands, e-mail: users-help@tomcat.apache.org
> >>
> >>
> >> ---------------------------------------------------------------------
> >> To start a new topic, e-mail: users@tomcat.apache.org
> >> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> >> For additional commands, e-mail: users-help@tomcat.apache.org
> >>
> >>
> >>   
> >>     
> >
> >
> > ---------------------------------------------------------------------
> > To start a new topic, e-mail: users@tomcat.apache.org
> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > For additional commands, e-mail: users-help@tomcat.apache.org
> >
> >
> > ---------------------------------------------------------------------
> > To start a new topic, e-mail: users@tomcat.apache.org
> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > For additional commands, e-mail: users-help@tomcat.apache.org
> >
> >
> >   
> 
> 
> ---------------------------------------------------------------------
> To start a new topic, e-mail: users@tomcat.apache.org
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
> 
> 
> 
> 


Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message