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From: herzlich@NGP.UTEXAS.EDU (Larry Herzlich)
Newsgroups: mod.computers.vax
Subject: RE: Monitoring CPU usage inside a program
Message-ID: <8610312245.AA02230@ngp.UTEXAS.EDU>
Date: Fri, 31-Oct-86 17:45:58 EST
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Posted: Fri Oct 31 17:45:58 1986
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>From: SYSRUTH@UTORPHYS.BITNET
>Subject: monitoring CPU usage inside a program
>Date: 29 Oct 86 17:01:00 GMT

>Does anybody out there know of a VMS utility (I can't find anything obvious)
>or a program they have written, which will monitor an executing image and
>produce statistics (e.g. histograms) on how much time it is spending on
>which portions of the program? 
>
>Ruth Milner

Will a DEC layered product work?
  
Have you heard of the PCA (Performance and Coverage Analyzer) from DEC.  It's
an interesting little tool which I think will do the trick.  DEC uses it 
internally. They've managed to fix problems in their own software and 
improve performance for sections of code that were spending too much time
in one area.  Two examples that were discussed at Spring DECUS 
included the Ada compiler and the TPU editor on the uVAX.  In the TPU
problem, they were able to find a bug in the code and for the Ada compiler
they were able to fix a problem with excessive page faulting.

We would probably buy the product for our systems except our users are
novice and don't care about performance.  We really don't have any 
people developing applications that need fine tuning.  

-- Larry Herzlich
   University of Texas at Austin
   Computation Center, User Services Division
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   CC.LHerzlich@a20.cc.utexas.edu