[rt-devel] REST performance drop after upgrade from 4.2.9 to 4.2.10
cloos at netcologne.de
Thu Apr 2 07:06:55 EDT 2015
Am 31.03.2015 um 19:54 schrieb Alex Vandiver:
> You've profiled the right thing, but not looked at the correct output
> from NYTProf. Namely, all this says is "7.24s were spent
> in /REST/1.0/show". You'll need to drill down into there to find out
> where the time is spent.
> Since you're looking for a regression, I suggest you profile both
> 4.2.10 and 4.2.9 (using the same steps you did above) and explore both
> profile outputs in parallel, looking for where the extra 2.5s is coming
OK, I found the bad guy: w3m ;-)
As part of our RT 4.2.10 upgrade I installed HTML::FormatExternal.
So we use w3m for HTML2Text conversions.
NYTProf shows for 4.2.9 (core formater)
# spent 141ms making 12 calls to
RT::Interface::Email::ConvertHTMLToText, avg 11.7ms/call
and for 4.2.10 (w3m formater)
# spent 10.1s making 12 calls to
RT::Interface::Email::ConvertHTMLToText, avg 840ms/call
which is called in RT::Transaction->Content.
A quick test of the other formaters just confirms what is already
mentioned in the commit :
* core is the fastest (2.9s)
* elinks is the slowest (5.7s)
* the others are in between (4.6s)
So as long as you don't find an reliable Perl HTML2Text converter, I
think there isn't much we can do here.
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