Re: CPU bound on 6 way HP T520/ Online 5 !
Try making your buffers dynamic by changing the following kernel parameters:
nbuf=0
bufpages=0
dbc_max_pct=70
dbc_min_pct=5
maxdsiz=117440512
Run some performance tools and determine if your System Tables are set too
high. If they are, reduce them to (2X current usage). For example:
NPROC is set to 200
sar -v shows that only 31 is in use reduce nproc to 62. Some of the
informix recommendations were too high and a waste of resources.
Semaphores are usually set too high by informix recommendations. Apply the
apply the same methodology used in the System Tables.
Try using dynamic VP if you are doing shared memory this would free up CPU's
if they are not needed and increase if needed. You must create a cron job
that runs onmode -F every half hour to free up the VP and the shared memory.
Good Luck.
At 09:34 PM 10/15/97 +0100, David Lee wrote:
}Hi,
}
}We are experiencing performance problems, ie slow, (20secs), response
}for users tranactions. Hardware and O/S etc are :
}
}h/w HP T520, 6 processor 1Gb ram, disk EMC Symmetrix
}o/s HP-UX 10.10
}Informix 5.x (not sure of version)
}
}From monitioring using Perfview, we can make the following summary:
}
}Number of users 360 - 400 with CPU usage between 85 - 100 %
}Average CPU 65 %
}Memory 60%
}Disk access is fine, no bottlenecks.
}
}Have not been able to tie down high CPU activity to a particular
}process, suggestion welcome regarding were to look next .
}
}--
}David Lee
}Organisation: only if absolutely necessary
}
Mario Agustin -- System Administrator
Phone # 510 639-2391
"If you put off everything until you're sure of it, you'll get nothing done"
---Norman Vincent Peale