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From <bastien.de...@bpo.be>
Subject Re: tomcat crash ... "unexpected exception"
Date Wed, 23 Jun 2004 13:06:30 GMT


Peter Lin wrote:
> by default, the max threads is set to 150 in server.xml.  Is your
> webserver really getting that many active requests at one time?  I've
> worked on some large sites and most of the time, the peak concurrent
> requests is usually less than 10. this is on some big Sun boxes.

Indeed you're right, I think it's not a problem at all, but I'm in a phase where I try to

check a maximum of points in my "possible problem causes" list ...

> just because there are 150 threads, not all of them are active. If
> you're using tomcat5, you can use the status servlet to see how many
> threads are active compared to the total threads.

I'm using Tomcat 4.1.30, is there an equivalent ?
Can I have this kind of information with the jkstatus page ?

> 
> peter
> 
> 
> On Wed, 23 Jun 2004 14:24:35 +0200, bastien.devos@bpo.be
> <bastien.devos@bpo.be> wrote:
> 
>>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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