Re: [Caml-list] Behaviour of an OCaml program: any possible GC improvement?

[John Whitington <john@coherentgraphics.co.uk>]

Hi,

Edgar Friendly wrote:
> On 10/24/2012 8:39 AM, John Whitington wrote:
>> David MENTRE wrote:
>>> <spontaneous>
>>> [2] 84.6 0.03 449.61 caml_call_gc [2]
>>> 0.00 449.61 755484/755484 caml_garbage_collection [3]
>> <spontaneous> means gprof can't find the calling function(s). Are you
>> sure you've used the -p both for compiling all source files and also
>> when linking them into the final executable?
>
> This line in the original profile might explain:
>> 9.79 347.23 52.01 88113 0.00 0.00 camlMap__map_181
> I'm guessing there's a lot of calls to Map.map, and this is causing all
> the garbage. As part of the stdlib, it wouldn't automatically be
> compiled for profiling, no?

You would expect to see some calls to caml_call_gc from functions in 
David's code (statistically, some allocations triggering gc would come 
from the user code).

So just <spontaneous> for the whole thing is very suspicious, especially 
for long-running code - see all the 1/4988 etc. lines in my original 
example.

-- 
John Whitington
Director, Coherent Graphics Ltd
http://www.coherentpdf.com/