Re: [Caml-list] What is triggering a lot of GC work?

[ygrek <ygrekheretix@gmail.com>]

On Tue, 26 Feb 2013 12:46:05 +0900
Francois Berenger <berenger@riken.jp> wrote:

> On 02/25/2013 07:32 PM, ygrek wrote:
> > On Mon, 25 Feb 2013 08:02:54 +0000
> > Mark Shinwell <mshinwell@janestreet.com> wrote:
> >
> >> On 25 February 2013 02:08, Francois Berenger <berenger@riken.jp> wrote:
> >>> Is there a way to profile a program in order
> >>> to know which places in the source code
> >>> trigger a lot of garbage collection work?
> >>
> >> Well, as of last week, there is!
> >>
> >> I'm working on a compiler and runtime patch which allows the
> >> identification, without excessive overhead, of every location (source
> >> file name / line number) which causes a minor or major heap allocation
> >> together with the number of words allocated at that point.
> >>
> >> There should be something available within the next couple of weeks.
> >> It only works on native code compiled for x86-64 machines at present.
> >> Currently it has only been tested on Linux---although I expect it to
> >> work on other Unix-like platforms with little or no modification.
> >
> > Meanwhile you can use poor man's allocation profiler :
> > - http://ygrek.org.ua/p/code/pmpa
> > - https://sympa-roc.inria.fr/wws/arc/caml-list/2011-08/msg00050.html
> 
> Did the changes reported on mldonkey to do less allocations had a 
> significant impact on performances?

Unfortunately, there was no feedback from the users of embedded versions of mldonkey,
who have constrained memory and cpu resources, but there were no performance problems reported
since then either, so it is hard to tell.

-- 
 ygrek
 http://ygrek.org.ua