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This produces a subfolder names <tt>nytprof.</tt> Direct your browser to file <tt>index.html</tt> therein. You will get a bunch of information how FHEM spends its time. | This produces a subfolder names <tt>nytprof.</tt> Direct your browser to file <tt>index.html</tt> therein. You will get a bunch of information how FHEM spends its time. | ||
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Version vom 13. Mai 2013, 20:23 Uhr
Profiling FHEM
What is profiling?
In software engineering, profiling ("program profiling", "software profiling") is a form of dynamic program analysis that measures, for example, the space (memory) or time complexity of a program, the usage of particular instructions, or frequency and duration of function calls. The most common use of profiling information is to aid program optimization. (from Wikipedia)
Profiling step-by-step
You need Devel::NYTProf from CPAN.
Start fhem.pl as follows:
perl -d:NYTProf /opt/fhem/fhem.pl /opt/fhem/conf/fhem.conf
Let it run for a while and then shut down FHEM.
You will find a bunch of nytprof.out files in /opt/fhem. nytprof.out contains the profile for the parent process and each nytprof.out.<pid> file contains the profile for a child process forked by the parent process. Not nytprof.out but the largest nytprof.out.<pid> file contains the profile of the master process since FHEM does an initial fork when it is ready.
You transfer the profile of the master process into something human-readable by issueing the command
nytprofhtml -f nytprof.out.<pid>
This produces a subfolder names nytprof. Direct your browser to file index.html therein. You will get a bunch of information how FHEM spends its time.