Re: Load problem with ims 5.2

An output from 'pstack' could give us a clue about what the imap 
processes are doing.

Fred

Rich Bishop wrote:
> Hello,
>
> We're running IMS 5.2 (I know it's old!) on Solaris 8 and suddenly 
> seeing some major load issues. It's one of two mailstores running on a 
> Sunfire 280R with 6GB. We've been on this hardware for a couple of 
> years and never noticed any problems until a couple of weeks ago.
>
> Suddenly on this one machine we see very high loads (up to 700). imapd 
> processes are always consuming most of the CPU in top, and the 
> activity is pretty evenly divided between user and kernel (ie. no or 
> minimal iowait). Here's a top snapshot - load is low right now but it 
> shows imapd chewing up all the cpu. At this time we had only 700 imap 
> connections.
>
>
>
> last pid:  9266;  load averages: 26.25, 26.14, 
> 44.50                                                              
> 21:29:56
> 86 processes:  78 sleeping, 6 running, 2 on cpu
> CPU states:  0.0% idle, 58.4% user, 41.6% kernel,  0.0% iowait,  0.0% 
> swap
> Memory: 6144M real, 596M swap in use, 4513M swap free
>
>  PID USERNAME THR PRI NICE  SIZE   RES STATE   TIME    CPU COMMAND
> 8248 mailsrv   33  53   -2  175M   43M run     3:06 51.89% imapd
> 8219 mailsrv   16  50   -2  184M   41M run     3:37 12.44% imapd
> 8231 mailsrv   28  50   -2  178M   42M run     3:58  8.79% imapd
> 8300 mailsrv   23  58    0   28M   21M run     0:42  3.59% 
> tcp_smtp_server
> 8230 mailsrv   30  59   -2  232M   41M sleep   3:50  2.84% imapd
> 23887 root      11  58    0  142M  141M sleep 105:58  0.97% bpbkar
> 8269 mailsrv   10  50   -2  181M   54M run     0:12  0.86% mshttpd
> 8272 mailsrv   13  59   -2  218M   61M sleep   0:23  0.59% mshttpd
>
> As this came on so suddenly without any configuration changes or major 
> addition of users, I was wondering if we have some corrupt database / 
> index somewhere, but I really have no idea where to look. Any 
> suggestions would greatly appreciated.
>
> Thanks,
>
> Rich