Re: Performance

[Dan Fitzgerald]

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

"When buying & selling are controlled by legislation, the first thing to be 
bought & sold are the legislators" - P.J. O'Rourke

Dan Fitzgerald





From: [EMAIL PROTECTED]
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
moderation.

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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