DevelopmentProfiling: Unterschied zwischen den Versionen
(→Profiling step-by-step: -> install mittels sudo apt-get hinzugefügt) |
Krikan (Diskussion | Beiträge) K (→Profiling step-by-step: -> Link korrigiert) |
||
| Zeile 4: | Zeile 4: | ||
== Profiling step-by-step == | == Profiling step-by-step == | ||
You need [http://search.cpan.org/ | You need [http://search.cpan.org/dist/Devel-NYTProf/ Devel::NYTProf] from CPAN. | ||
On Debian based systems install package "libdevel-nytprof-perl": | |||
<code>sudo apt-get install libdevel-nytprof-perl</code> | <code>sudo apt-get install libdevel-nytprof-perl</code> | ||
| Zeile 22: | Zeile 22: | ||
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. | ||
==Links== | |||
[[Kategorie:Development]] | [[Kategorie:Development]] | ||
official perlfaq: [http://learn.perl.org/faq/perlfaq3.html#How-do-I-profile-my-Perl-programs How do I profile my Perl programs?] | |||
Version vom 18. April 2017, 09:36 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.
On Debian based systems install package "libdevel-nytprof-perl":
sudo apt-get install libdevel-nytprof-perl
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.
Links
official perlfaq: How do I profile my Perl programs?