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From "Ralph Einfeldt" <ralph.einfe...@uptime-isc.de>
Subject RE: tomcat crash ... "unexpected exception"
Date Wed, 23 Jun 2004 12:51:21 GMT

The number of threads is depending on
- the number of threads the jvm needs to run
- the number of threads tomcat needs to run
- AFAIK one thread for each active processor
  (-> at least minProcessors)
- the number of threads that are used by the application

But there is no way to know the number of max threads,
I'm not shure if there is a option to query tomcat for 
the number of active processor threads.

You can verify the number of processor threads by 
calling kill -QUIT <java-pid>. This should produce 
a stacktrace in one of the log files. You should be 
able to identify the by their name.


> -----Original Message-----
> From: bastien.devos@bpo.be [mailto:bastien.devos@bpo.be]
> Sent: Wednesday, June 23, 2004 2:25 PM
> To: Tomcat Users List
> Subject: Re: tomcat crash ... "unexpected exception"
> 
> 
> Again about my general problem, below is an output of the 
> 'top' command on the webserver.
> We can see that the Tomcat java process (the first one) has 
> 135 threads in it. How is this 
> defined ? I guess this number is dynamic, but how can I say 
> that it is its maximum or not 
> ? If it is, it may be some kind of bottleneck ...
> 
> Is it related to the settings of min/max processors in server.xml ?
> 
> ----------------------
> last pid: 14592;  load averages:  0.27,  0.25,  0.26 
>                                                 14:14:21
> 173 processes: 165 sleeping, 7 zombie, 1 on cpu
> CPU states: 91.5% idle,  3.9% user,  4.2% kernel,  0.4% 
> iowait,  0.0% swap
> Memory: 8192M real, 1404M free, 6472M swap in use, 7856M swap free
>  
> 
>     PID USERNAME THR PRI NICE  SIZE   RES STATE    TIME    CPU COMMAND
>   11751 userx    135   0   10 6288M 4718M sleep    9:55  0.60% java
>     680 root       4 150  -20 3568K 2424K sleep  489:23  0.13%
>   14526 root       1 150  -20 2056K 1472K sleep    0:00  0.06%
>   14527 root       1 150  -20 2056K 1472K sleep    0:00  0.06%
>    5078 root      12   1    0 7312K 6272K sleep   72:41  0.05%
>    8529 root       1  59    0 2776K 1848K cpu/0    0:08  0.05% top
>   14513 userx      8   1    0 7280K 5864K sleep    0:00  0.05% httpd
>   14591 userx      6   0    0 6848K 5112K sleep    0:00  0.03% httpd
>   14524 root       1 150  -20 2056K 1472K sleep    0:00  0.03%
>   14592 userx      4   0    0 6720K 5016K sleep    0:00  0.02% httpd
>   14533 root       1 150  -20 2176K 1408K sleep    0:00  0.02%
>   14534 root       1 150  -20 2176K 1408K sleep    0:00  0.02%
> ----------------------
> 
> Thanks,
> 
> Bastien.
> 
> 
> 
> Ralph Einfeldt wrote:
> > That error can something between 'ignore it' and 'severe error'.
> > 
> > Tomcat failed while writing the response to mod_jk.
> > That can be caused by this reasons:
> > - the apache child that created the request died
> > - the user closed the browser before the response was sent 
> > - there may be further reasons
> > 
> > 
> >>-----Original Message-----
> >>From: bastien.devos@bpo.be [mailto:bastien.devos@bpo.be]
> >>Sent: Wednesday, June 23, 2004 11:39 AM
> >>To: Tomcat Users List
> >>Subject: Re: tomcat crash ... "unexpected exception"
> >>
> > 
> > 
> >>Jun 23, 2004 11:17:12 AM org.apache.jk.server.JkCoyoteHandler action
> >>SEVERE: Error in action code
> >>java.net.SocketException: Broken pipe
> > 
> > 
> > 
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> 
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> 
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