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07-10-2002
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Any limitations to the "top" command?
Anyone know of any limitations? Also, does anyone know a great way to determine which processes are hogging CPU?
TIA |
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07-10-2002
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What OS and version and exactly what limitations to top? It should show what processes are hogging the CPU at any given time - else sar may give you a clue.
What is the system running (applications)? What are the complaints? |
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07-10-2002
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AIX 4.3 type->PowerPC_RS64-III
4 - 450Mhz processors 12GB RAM I guess an example might be when we are experiencing slow downs of our application, and we look at "top", it will tell us that we have 2GB of real memory free, yet there 3rd party reports that show we a paging A LOT. How can this be? We have 12GB total free memory. Any ideas? |
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07-10-2002
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It would help to know the application. Also, unless you have been watching this server and have a clear history of what it has done and where it has gone, there isn't much you can speculate at.
What has changed? Added many more users? Database (assumtion) has grown 2+ times as large? Been awhile since I've played with AIX but there are many tools included with it that you should be able to utilize to find what may be causing problems - but first you have to be sure you know that this "paging" is really a problem. Don't always believe it just because someone says so. It could be as simple as a user running reports that should be done during the night. Check what's running on the system during these times. Get someone to call when they see the problem - someone you believe to be truthful and who knows what they are talking about. Become friends with your DBA (if applicable) - they can give insight to the application database. Check on IBM's web site for more tools and resources. |
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07-10-2002
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Just to give you an idea of what were running:
Lawson Software application (ERP package similar to PeopleSoft) Applications and database are on seperate servers, which are very similar. 800-900 users daily Around 4:00pm EST EVERY DAY our applications batch job queue is jammed, and we can have 40-50 jobs "waiting" to run. According to "top", we have plenty of free memory available and CPU% never gets below 10 on any of the processors. Is this just too many users pounding away at the application at the same time? database issues? Everyone is trying to say it's memory, but I'm trying to convince them that it is the application. Thanks for your input. |
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