IgProf is both a performance profiler and a memory allocation profiler. This exercise will introduce you to the basic mechanics of using IgProf. Later exercises will go into more detail, so don’t worry about understanding everything at this point; the main goal here is to learn how to use the tool.
Basic profiling environment
To make sure you have technically everything set up right, let’s first make
sure you can create a dummy profile for a simple run of the ls command.
Make sure your environment is correct:
[studentNM@esc-XY ~]$ igprof -h
igprof [options] program [options]
Options to igprof:
-h, --help this help message
...
Create your very first igprof report on ls:
[studentNM@esc-XY ~]$ igprof -pp -z -o ls-test.gz -- ls -laFR /usr/lib >/dev/null
[studentNM@esc-XY basic]$ igprof-analyse --sqlite -d -v -g ls-test.gz |
> sqlite3 ~/public_html/cgi-bin/data/ls-test.sql3
View the report at http://esc-gw.pd.infn.it:61100/~studentNM/cgi-bin/igprof-navigator.py/ls-test/
Basic performance profile
This exercise will run the program from the previous exercise on cputicks
using igprof statistical performance profiler.
Run the test program under igprof performance profiler:
[studentNM@esc-XY ~]$ cd esc16/hands-on/basic
[studentNM@esc-XY basic]$ igprof -pp -z -o cputicks.gz ./cputicks 1000000
Generate a simple text profile output of run time:
[studentNM@esc-XY basic]$ igprof-analyse -d -v -g cputicks.gz > cputicks.res
[studentNM@esc-XY basic]$ less -SX cputicks.res
Counter: PERF_TICKS
----------------------------------------------------------------------
Flat profile (cumulative >= 1%)
% total Total Function
100.0 0.11 <spontaneous> [1]
100.0 0.11 _start [2]
100.0 0.11 __libc_start_main [3]
100.0 0.11 main [4]
100.0 0.11 pi(int) [5]
...
Generate the same profile in a web-viewable database; then view the
profile at http://esc-gw.pd.infn.it:61100/~studentNM/cgi-bin/igprof-navigator.py/cputicks/:
[studentNM@esc-XY basic]$ rm -f ~/public_html/cgi-bin/data/cputicks.sql3
[studentNM@esc-XY basic]$ igprof-analyse --sqlite -d -v -g cputicks.gz |
> sqlite3 ~/public_html/cgi-bin/data/cputicks.sql3