To use dylibprof(1), /usr/libexec/profileServer must be running. So first start /usr/libexec/profileServer and leave it running in the back ground:
% /usr/libexec/profileServer >& /dev/console &
/usr/libexec/profileServer starts up with shared pc sampling disabled. It should not be left running with shared pc sampling enabled if no sampling is being done as every launch of a program that uses the dynamic linker is effected. This is true even to a small extent if there no libraries being sampled.
If you need to profile from boot up for all processes then the following line can be added to /etc/bootstrap.conf:
server "/usr/libexec/profileServer" services NSProfileServer NSProfileControl; Before any dynamic shared library can be sampled sampling must be enabled as follows: % dylibprof -e
It can then later be disabled when no more sampling is to be done with:
% dylibprof -d
% dylibprof -c /System/Library/Frameworks/System.framework/Versions/B/System
Then begin the sampling:
% dylibprof -b /System/Library/Frameworks/System.framework/Versions/B/SystemAfter this programs launched using this library will be part of the shared pc sampling. Typlically what would be done is to then use the system normally for a number of hours.
Then to halt the sampling:
% dylibprof -h /System/Library/Frameworks/System.framework/Versions/B/System
The profiling output file (a gmon.out file) can be created with:
% dylibprof -p -o /tmp/gmon.out /System/Library/Frameworks/System.framework/Versions/B/System
Using the profiling output file and the library a profile listing and a time based order file (time.order) can be created with: gprof(1):
% gprof -S /System/Library/Frameworks/System.framework/Versions/B/System /tmp/gmon.out When no more sampling for this library is to be done the sample buffer can be removed with: % dylibprof -r /System/Library/Frameworks/System.framework/Versions/B/System
The options are: