|
|
Using hiprof on Mozilla under Digital Unix
Instrumentation
Hiprof is a profiler built around the ATOM tool available under Digital Unix.
I believe that ATOM and Hiprof are a standard part of Digital Unix 4.0, so
if you are developing under Digital Unix you should have them. ATOM tools
work by taking a non-stripped executable and generating a new executable
which can analyze itself as it runs. This process is pretty simple for
a statically linked executable which does not load any shared libraries at
runtime. It gets a little more complicated when dealing with dynamically
linked executables which also do runtime loading.
Scripts
I have put together a couple of scripts which take care of all this.
Both of these scripts are meant to be run from the top of your build tree.
The first script, hiprofme is used to create the
instrumented executable. The second script, gprofme,
is used to analyze the data produced when the instrumented executable is
run.
Right now they are very dependent on the specific environment that I use.
I would like to fix that in the future, but for right now you will have to
edit them to reflect your environment. My environment is shown below.
Note that I do not build in the source tree. I don't think you would have a
problem if you did, I just don't.
/group/jlnance/tmp is --prefix for glib, gtk, nspr, and IDL.
/group/jlnance/tmp/src/mozilla is the top of the mozilla source.
/group/jlnance/tmp/src/bm is where I build the source.
/group/jlnance/tmp/atomlibs is where I store instrumented shared libs.
Running
To use all this first build apprunner. Then create the atomlibs directory
and run the hiprofme script. You should now have an executable called
dist/bin/apprunner.hiprof. Now run it:
pushd dist/bin
setenv LD_LIBRARY_PATH /group/jlnance/tmp/atomlibs
./apprunner.hiprof
popd
When I ran it I had a little problem getting it to quit. When I selected the
quit menu, it would take down the window, but then it would hang. I just
killed it with ^C after a few seconds and this did not seem to hurt anything.
Now you can run the gprofme script, and it will dump out a profile. I have
a script called gprof2html to convert the profile
into html. To run it do:
gprofme | awk -f gprof2html >gprof.html
Advanced
Hiprof is a very nice profiler. It allows you to combine profiles from
multiple runs, dump profile information from a running process with out killing
it, and to profile only part of a run. These scripts are meant as starting
points rather than as the definitive way to use the tools. If you get the
scripts working, I would encourage you to read more about hiprof and other
ATOM tools:
|
