top command

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1

hi guys,
i am having a dual cpu xeon machine.
i came to know that i can view the performance by giving top command.
but top command shows only the usage of one cpu in percentage
while the process are using more than 100% usage in the list .
can i know separately the usage of cpus.
can you guys suggest any help if this question means something.

2

What is the OS thats run on your system. You can install sysstat on Linux and use sar command to view the CPU usage. Top does not seem to show CPU usage properly. It shows 49.9% for a process even when that process is using more than that

3

doing 'man top' yields [amoung others]

4

Thats true when the process is single threaded as it is run on one CPU. In my case, i have a multi threaded java code. However, if i use sar with some switches to see a process CPU usage, it was showing properly.

5

right - that was the disclaimer in the 'man' pages of the top version I've got here - it might have changed in the later version of 'top'.

And how 'bout 'prstat'?

6

This was on Redhat linux only and also on only some machines. There is some inconsistency. I am not sure if Linux has prstat.However, I did not see any such issue with top on HP-UX, topas on AIX and prstat and top on solaris. I am not sure what OS bijuhpd is using and his process is single threaded or multi-threaded..