On 24/10/15 09:40, Moritz Lenz wrote:
Hi Gabor,
On 10/24/2015 09:26 AM, Gabor Szabo wrote:
The Devel::NYTProf helped me a lot locating the source of slowness on
the Perl Maven site.
Is there something similar for Perl 6 so I can try to improve the speed
of the Perl 6 Maven site too?
Rakudo has a --profile command line option, which generates a HTML file
containing a single-page JS app that presents the profiling data.
But you should take care to only profile short program executions that
way (a few seconds at most), otherwise the result will be unusable in
the browser.
Cheers,
Moritz
It's a common tip to "only profile short program executions", but that
misses the actual point by a few centimeters. The things that makes the
profiler super slow are:
1) having a gigantic amount of different subs and methods that get
touched by the program at some point
2) having very, very deep call chains
3) having the GC run thousands of collections
if I understand correctly.
Recently, Coke++ switched the profiler JS app from a kind of old version
of angular.js to a newer version that has had lots of performance
improvements done to it by the google devs; i expect that helps
tremendously, though i have not actually measured anything beyond a new
feeling of "snappyness".
regards
- Timo
