tomcat-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Randy Layman <randy.lay...@aswethink.com>
Subject RE: tomcat thread hogs CPU - is this a bug ?
Date Wed, 09 May 2001 15:37:32 GMT

	There is a note in Tomcat's ReadMe file that details a bug about a
certain misconfiguration that causes 100% CPU utilization.  Once you read
that, and remember that each thread handles one request, you will understand
why only one thread is using 100% CPU.

	Randy

> -----Original Message-----
> From: Martin, Brian [mailto:BMartin@AlamoLocal.com]
> Sent: Wednesday, May 09, 2001 9:46 AM
> To: 'tomcat-user@jakarta.apache.org'
> Subject: tomcat thread hogs CPU - is this a bug ?
> 
> 
> 
> I am running tomcat 3.2 on an dual cpu HPUX-11.0 box, 
> using IIS on the front end on an NT box.
> 
> when I look at the thread list (using glance) for the tomcat process,
> i can see 42 threads, but only one of them is showing high cpu usage
> in this screen shot, it is thread id 8168.
> 
> why are there so many threads at 0 % ?  
> 
> is anyony else running tomcat on hpux ? if yes, can you email me your
> screen captures showing performance related stuff. I am 
> trying to figure
> out whether or not some of the things that i am looking at 
> are 'normal'
> or just my system.
> 
> is there a way to tell what each thread is doing ?
> 
> 
> 
> 
> Thread List PID:  2805, java            PPID:  2803 euid:   101 User:
> weblogic
>            CPU Util    CPU Tm      Phys          Logl
> Block
>  TID    (  200% max)    Cum       IO Rate      IO Rate   
> Scheduler  Pri   On
> --------------------------------------------------------------
> --------------
>   8150    0.0/   0.0     1.8    0.0/   0.0    0.0/   0.0      
> HPUX  154
> SYSTM
>   8167    0.0/   0.0     0.0    0.0/   0.0    0.0/   0.0      
> HPUX  154
> SYSTM
>   8168   46.8/   6.5  3950.7    0.0/   0.0    0.0/   0.0      
> HPUX  239
> PRI  
>   8169    0.0/   0.0     1.0    0.0/   0.0    0.0/   0.0      
> HPUX  154
> SYSTM
>   8170    0.0/   0.0     1.5    0.0/   0.0    0.0/   0.0      
> HPUX  154
> SYSTM
>   8171    0.2/   0.1    79.6    0.0/   0.0    0.0/   0.0      
> HPUX  168
> SLEEP
>   8172    0.0/   0.0     0.0    0.0/   0.0    0.0/   0.0      
> HPUX  154
> SYSTM
>   8173    0.7/   0.1    33.5    0.0/   0.0    8.1/   0.8      
> HPUX  154
> SYSTM
>   8174    0.0/   0.0     3.6    0.0/   0.0    0.0/   0.0      
> HPUX  168
> SLEEP
>   8175    0.0/   0.0    11.2    0.0/   0.0    0.0/  10.9      
> HPUX  154
> SYSTM
>   8176    0.0/   0.0     4.3    0.0/   0.0    0.0/   4.1      
> HPUX  154
> SYSTM
>   8177    4.8/   0.1    57.8    0.0/   0.0 3564.2/  56.9      
> HPUX  192
> PRI
>   8178    0.0/   0.2   108.1    0.0/   0.0    0.0/ 103.3      
> HPUX  154
> SYSTM
>   8179    0.0/   0.0    16.0    0.0/   0.0    0.0/  15.6      
> HPUX  154
> SYSTM
>   8180    7.6/   0.3   186.5    0.0/   0.0 5402.8/ 188.7      
> HPUX  192
> PRI
>   8181    4.0/   0.1    47.5    0.0/   0.0 2815.3/  49.6      
> HPUX  154
> STRMS
>   8182    0.0/   0.3   155.4    0.0/   0.0    0.0/ 159.6      
> HPUX  154
> SYSTM
>   8183    4.7/   0.3   164.6    0.0/   0.0 2677.0/ 169.5      
> HPUX  154
> SYSTM
>   8184    4.7/   0.3   207.6    0.0/   0.0 2556.4/ 209.6      
> HPUX  193
> PRI
>   8185    0.0/   0.0     0.2    0.0/   0.0    0.0/   0.0      
> HPUX  154
> SYSTM
>   8190    0.0/   0.0     0.3    0.0/   0.0    0.0/   0.0      
> HPUX  154
> SYSTM
>   8191    0.0/   0.0     3.9    0.0/   0.0    0.0/   0.0      
> HPUX  154
> SYSTM
>   8192    0.0/   0.0     0.0    0.0/   0.0    0.0/   0.0      
> HPUX  154
> SYSTM
>   8193    0.0/   0.0     4.1    0.0/   0.0    0.0/   0.0      
> HPUX  154
> SYSTM
>   8194    0.0/   0.0     0.2    0.0/   0.0    0.0/   0.0      
> HPUX  154
> SYSTM
>   8195    0.2/   0.1    50.7    0.0/   0.0    0.0/   0.0      
> HPUX  154
> SLEEP
>   8196    0.0/   0.0     0.3    0.0/   0.0    0.0/   0.0      
> HPUX  154
> SYSTM
>   8197    0.0/   0.0     4.6    0.0/   0.0    0.0/   0.0      
> HPUX  154
> SYSTM
>  29571    0.0/   0.1     7.2    0.0/   0.0    0.0/   0.0      
> HPUX  154
> SYSTM
>   8546    0.0/   0.0     0.0    0.0/   0.0    0.0/   0.0      
> HPUX  154
> SYSTM
>   8547    0.0/   0.0     0.0    0.0/   0.0    0.0/   0.0      
> HPUX  154
> SYSTM
>   8548    0.0/   0.0     0.0    0.0/   0.0    0.0/   0.0      
> HPUX  154
> SYSTM
>   8549    0.0/   0.0     0.0    0.0/   0.0    0.0/   0.0      
> HPUX  154
> SYSTM
>   8550    0.0/   0.0     0.0    0.0/   0.0    0.0/   0.0      
> HPUX  154
> SYSTM
>   8551    0.0/   0.0     0.0    0.0/   0.0    0.0/   0.0      
> HPUX  154
> SYSTM
>   8552    0.0/   0.0     0.0    0.0/   0.0    0.0/   0.0      
> HPUX  154
> SYSTM
>   8553    0.0/   0.0     0.0    0.0/   0.0    0.0/   0.0      
> HPUX  154
> SYSTM
> 
> 
> Brian Martin
> Unix Administrator
> Alamo, Local Market Division
> (440) 715-3549
> 

Mime
View raw message