Continued Notes on Profiling

• callgrind (part of valgrind) in fact does profiling
  • https://web.stanford.edu/class/archive/cs/cs107/cs107.1174/guide_callgrind.html
• what is a call graph?
  • https://en.wikipedia.org/wiki/Call_graph
• when running as gluex@sandd1 and launching profile_cron.sh on ifarm1901 via ssh via the command line, lots of binary output comes back to stdout/err

• callgrind (part of valgrind) in fact does profiling
  • https://web.stanford.edu/class/archive/cs/cs107/cs107.1174/guide_callgrind.html
• what is a call graph?
  • https://en.wikipedia.org/wiki/Call_graph
• when running as gluex@sandd1 and launching profile_cron.sh on ifarm1901 via ssh via the command line, lots of binary output comes back to stdout/err
• when doing the same as a cron job, nothing every comes back (no email)
• profile_cron.sh runs fine as gluex on ifarm1901 interactively

And Still More Notes on Profiling

hd_rawdata_030300_000.evio is in /cache/halld/RunPeriod-2017-01/rawdata/Run030300

to process a specified number of events

-PEVENTS_TO_KEEP=100

to skip some number of events at the beginning of the file:

-PEVENTS_TO_SKIP=10

gprof is not good for multi-threaded programs and also not good for shared libraries. look at callgrind. https://gernotklingler.com/blog/gprof-valgrind-gperftools-evaluation-tools-application-level-cpu-profiling-linux/#fn:3

oprofile was dropped in Fedora 30 in favor of perf. It is there in RHEL 7. https://bugzilla.redhat.com/show_bug.cgi?id=1706064

More Notes on Profiling

Valgrind

Example commands:

• valgrind –tool=callgrind a.out
• callgrind_annotate -auto=yes callgrind.out.1485
• kcachegrind output-file [?]

gprof

gprof is on wikipedia: https://en.wikipedia.org/wiki/Gprof

Example of profiling hd_root:

git clone git@github.com:jeffersonlab/halld_recon
cd halld_recon
cd src
gxenv
git checkout pasteurize_rebased_mmi
scons -u install PROFILE=1 -j16
cp $HALLD_VERSIONS/version_fedora33.xml .
e version_fedora33.xml # edit to use this version of halld_recon
gxenv version_fedora33.xml
hd_root -PPLUGINS=danarest -PEVENTS_TO_KEEP=1000 /data/gluex/rawdata/hd_rawdata_030300_001.evio 
gprof `which hd_root` >& gprof.txt
lw gprof.txt 
 

• jana, halld_recon, and halld_sim all accept the PROFILE=1 option to scons
• throwing the -pg switch can have an effect on execution speed according to this.
• This example gives the “no time accumulated” error.

Notes on Profiling

• To turn on profiling in sbms.py (at least for halld_sim) specify PROFILE=1 as an option to scons. For example, to built genr8 with profiling enabled:

cd src/programs/Simulation/genr8
scons -u install PROFILE=1