There is an instrumentation mode for the OCaml GC whose usage I have
described in a blog post and on the caml-list:


http://prl.ccs.neu.edu/blog/2016/05/24/measuring-gc-latencies-in-haskell-ocaml-racket/
  https://sympa.inria.fr/sympa/arc/caml-list/2016-05/msg00219.html

(I am realizing that the simple change I proposed, of building the
instrumented runtime by default, was forgotten, and will submit a pull
request shortly -- hopefully it will be present in 4.07... In the meantime,
people have to build the compiler with the -with-instrumented-runtime flag
explicitly set.)

On Mon, Dec 11, 2017 at 7:53 PM, Julia Lawall <julia.lawall@lip6.fr> wrote:

>
>
> On Tue, 28 Nov 2017, Yawar Amin wrote:
>
> > Hi Juli, you can take a lookat https://realworldocaml.
> org/v1/en/html/understanding-the-garbage-collecto
> > r.html for some explanations of the various knobs. Specifically, the
> in-text
> > note sections (marked with the icon of two pages) give some helpful
> hints.
> > The first one on the page is 'Setting the Size of the Minor Heap'.
>
> Is it possible to know when a major GC starts, to be able to measure the
> time spent?  I saw the verbose flag in the control structure, but that
> just prints a message.  I don't see how to get the time.
>
> thanks,
> julia
>
> > Regards,
> >
> > Yawar
> >
> > On Tue, Nov 28, 2017 at 1:11 PM, Julia Lawall <julia.lawall@lip6.fr>
> wrote:
> >       Hello,
> >
> >       Is there any reasonable way to reduce the amount of garbage
> >       collection
> >       activity in an OCaml program?  I see various knobs in the
> >       control
> >       structure, but I don't know what the impact of changing the
> >       values would
> >       be.
> >
> >       thanks,
> >       juli
> >
> >       --
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> >
> >
> >
> >
>
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