Another thing you could do is truss -p pid for a typical process to see every system call it makes. Capture the output, and see what's up in detail. Note especially where it hangs and waits for a resource while you're watching it on screen. Don't worry so much about the stuff that scrolls by fast (unless it's stuck in a loop, for example); when it stops scrolling might be an indication of a bottleneck. (also with exceptions, like waiting for input). Used with vlist, you can see what line of BASIC code is getting executed, for when you get into the repair phase.

"Our greatest duty in this life is to help others. And please, if you can't help them, could you at least not hurt them?" - H.H. the Dalai Lama

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Dan Fitzgerald

Reply-To: U2 Users Discussion List <[EMAIL PROTECTED]>
To: U2 Users Discussion List <[EMAIL PROTECTED]>
Subject: Re: Performance
Date: Thu, 8 Apr 2004 13:30:58 -0400

If you are running Topas to monitor the system performance, only have one
instance of it open and have it update once every 5 seconds. I have heard of
situations where 5 or 6 people would have topas running at the same time
effectively bogging the server down. Topas can hog resources if not used in

As was mentioned, nmon is an excellent replacement for topas. Set it's
refresh/update setting at 4 seconds instead of the default of 2 seconds.

Be careful if you are running performance gathering tools, they are a huge
performance hit. filemon is extremely resource hungry.  Only run it
occasionally, not continiously.

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