Hi, On Wednesday 25 May 2011, Frank Chang wrote: > Good afternoon, We are currently using callgrind on Centos Linux 5.5 > x86_32 to profile an entire program using the > command:/home/frankc/DQTTest2/valgrind-3.6.1/coregrind/valgrind > --tool=callgrind --dump-instr=yes --simulate-cache=yes > --collect-jumps=yes ./MatchUpAccurate.exe > We were wondering whether Is it possible for callgrind to > selectively profile certain periods of our program's execution? > We > understand there is callgrind tool : 1. callgrind_control -i on 2. > callgrind_control -i off that may allow us to profile certain periods > of a program's execution. > However, we uncertain which callgrind options we should use to > accomplish this requirement . So far we think we need to use: > :/home/frankc/DQTTest2/valgrind-3.6.1/coregrind/valgrind > --tool=callgrind -instr-atstart=no ????. Could any valgrind users or > engineers tell us how to use the --instr-atstart=no option with our > program ./MatchUpAccurate.exe? Thank you.
If you want seperate profiling information for "certain periods" in your program, you should ask Callgrind to write seperate profile files for every period you are interested in. Changing the "instrumentation state", with the options you mention above, is only needed if you want to speed up Callgrind for periods you are not interested in. But if you do not worry about simulation time, no need to use these options. At the beginning of a program period you want to profile, set the counters to zero (either callgrind_control -z, or add "CALLGRIND_ZERO_STATS;" into your source), and at the end, dump the profile to a file (using callgrind_control -d, or "CALLGRIND_DUMP_STATS;"). Everytime you trigger a dump, a new file will be generated. If the start/end of the period you want to profile is at a function boundary, you can also use the options --zero-before=<name of function when entered starts the period> and --dump-after=<name of function when left ends the period> Josef > > ------------------------------------------------------------------------------ > vRanger cuts backup time in half-while increasing security. > With the market-leading solution for virtual backup and recovery, > you get blazing-fast, flexible, and affordable data protection. > Download your free trial now. > http://p.sf.net/sfu/quest-d2dcopy1 > _______________________________________________ > Valgrind-users mailing list > Valgrind-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/valgrind-users > ------------------------------------------------------------------------------ vRanger cuts backup time in half-while increasing security. With the market-leading solution for virtual backup and recovery, you get blazing-fast, flexible, and affordable data protection. Download your free trial now. http://p.sf.net/sfu/quest-d2dcopy1 _______________________________________________ Valgrind-users mailing list Valgrind-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/valgrind-users
