topic Re: Process Issue urgent help required in Operating System - HP-UX

Process Issue urgent help required

xcvzxvzxdv — Mon, 17 Apr 2006 01:28:48 GMT

Hi, I have a question there is a process that is utilizing only 0.15 % of CPU. Is it possible to increase the CPU power for this process so that this rocess can be completed before.

Re: Process Issue urgent help required

Matti_Kurkela — Mon, 17 Apr 2006 03:15:31 GMT

If the CPU utilization of the process is low and there is free CPU capacity available, there must be a bottleneck somewhere.

Your process may be waiting for I/O: if the process "says" to the OS: "I need to get this piece of data from the disk before I can do anything else", the OS makes the process sleep until the data is transferred from the disk to memory. In this case increasing the CPU power does not help: you need to make the disks faster.

The system may also be so busy swapping (paging) things in and out of memory so it cannot give much CPU time to the application processes. This means the system needs more RAM memory so it won't need to spend so much time moving things in and out of swap.

The bottleneck may be in the network too: if your process is accessing the database through the network and the database is slow in answering, the process must wait for data to come in through the network before it can do its job.

Bottom line: If a lot of time is spent in waiting for something, the CPU utilization % becomes low. You must find out what the system is waiting for, and make that thing happen faster, or alternatively remove the need to do that.

Re: Process Issue urgent help required

xcvzxvzxdv — Mon, 17 Apr 2006 07:46:08 GMT

Hi thanks for ur reply, but I am quiet new to this and I am unable to find from where to start with. I would appreciate if you could help in isolating the issue.

Re: Process Issue urgent help required

Matti_Kurkela — Thu, 20 Apr 2006 10:41:40 GMT

More information is needed.

What is the server's overall load level? If the CPU is not about 100% busy, the CPU power is not the problem.

Is this process the main workload of this server, or is there something else that is using most of the CPU power?

What does "swapinfo -t" report?

"vmstat 5" displays a set of memory statistics every five seconds. What kind of values do you get? Check the page-out column (po): if the value tends to be anything other than 0, your system is spending time moving data in and out of swap, which often means you're not getting very much useful work done. Occasional spikes in the page-out value might be tolerable: value being consistently above 0 usually isn't. If this is the case, you need more physical memory (RAM).

Re: Process Issue urgent help required

Steven E. Protter — Thu, 20 Apr 2006 10:49:51 GMT

Shalom,

If its active, you can renice it. Lower nice values mean higher priority.

That will only help if the process is not sleeping.

http://h30097.www3.hp.com/docs/porting/interop/process.html

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