[SUMMARY] Processing seems to concentrate in a single processor

From: Arnaldo Mandel (am@ime.usp.br)
Date: Fri Oct 17 1997 - 10:18:29 CDT

As always, the answers came up almost instantly. Original question:

> How can I check whether the load in a MP box is being distributed
> among the processors - and correct the problem if it is not?

Jeff Wasilko <jeffw@smoe.org>
greg@crusoe.net (Greg Coleman (G-tech Corp.))
pointed out /usr/bin/mpstat

greg@crusoe.net (Greg Coleman (G-tech Corp.))
suggested proctool: http://www.tamu.edu/~ftp/pub/suntools/proctool/

Continuing my original question:
> AFAIK, on way of checking is via top: a higher than 100% accumulated
> CPU load is a sign of multiprocessing.

Casper Dik <casper@holland.Sun.COM> said:

: Not true. On a Solaris system, 100% use of one CPU on a N-way system gives
: you 100/N% CPU use.
: The percentage is teh percentage *of the total system* not of a single CPU.
(my comment: at least on a 4-way SPARCserver-1000 my claim abou top is
true - maybe it is an old top).

[top output]

: Hm, 16.67%, perhaps you have a 6 CPU machine?

[prtdiag output]

: Yes, you have!
: Since you have 4 single threaded processes, the best you can hope
: for is 100x4/6 = 66%, for those processes. An additional 6% is apparently
: used for otehr processes.
: BTW, the latest version of top will show the cpu # on which a proces
: lives:

That is version 3.5beta6, I just grabbed from
I am currently using the latest nonbeta, 3.4.

Thanks to all of you.

Arnaldo Mandel                        
Computer Science Dept.		  
Universidade de S\~{a}o Paulo, Brazil	  

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