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<== Date ==> <== Thread ==>
Subject: Re: profiling an IOC
From: "Johnson, Andrew N. via Tech-talk" <tech-talk at aps.anl.gov>
To: "D. Peter Siddons" <siddons at bnl.gov>
Cc: EPICS tech-talk <tech-talk at aps.anl.gov>
Date: Fri, 17 Jul 2020 20:44:33 +0000
Hi Pete,

On Jul 17, 2020, at 3:19 PM, Siddons, David via Tech-talk <tech-talk at aps.anl.gov> wrote:

I'd like to understand where my IOC code is taking its time, and gprof seems like the right tool for this, is that right? Where would I add the compile flags (-pg)? 

I’ve never tried gprof myself, but I can answer the build question.

If you’re just profiling the code in a specific module you could add them to the USR_CFLAGS and/or USR_CXXFLAGS variables in a specific Makefile. However if you want them to apply to everything during a rebuild we have a set of similar variables that are strictly for use from the command-line, so you would say something like

make rebuild CMD_CFLAGS=-pg CMD_CXXFLAGS=-pg

These variables have been present since 3.14.12.5.

Note that if you use this when building Base you may be running profiling during the build process itself as we build and run the antelope and e_flex programs (our versions of lex and yacc) and makeBpt as part of the build. The other build-time tools are all scripts though.

HTH,

- Andrew

-- 
Complexity comes for free, simplicity you have to work for.

References:
profiling an IOC Siddons, David via Tech-talk
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