Re: [Caml-list] Performance-question

[Damien Doligez <damien.doligez@inria.fr>]

On 2008-02-05, at 14:33, Oliver Bandel wrote:

> Each sample counts as 0.01 seconds.
>  %   cumulative   self              self     total
> time   seconds   seconds    calls   s/call   s/call  name
> 44.45    163.08   163.08    26627     0.01     0.01  mark_slice
> 22.31    244.92    81.84    38447     0.00     0.00  sweep_slice
> 14.40    297.74    52.82      131     0.40     0.61  caml_compact_heap
>  3.49    310.54    12.80 372416920     0.00     0.00   
> invert_pointer_at
>  3.40    323.02    12.48 560604006     0.00     0.00  compact_allocate
>  3.12    334.45    11.43  9725772     0.00     0.00  caml_fl_allocate
>  0.92    337.81     3.36    25607     0.00     0.00  caml_add_to_heap

That's a lot of time spent in the compactor, indicating that your
program has a memory fragmentation problem.

I would be very interested in getting a copy of your program and data,
as I'm currently experimenting with new allocation policies designed
to reduce fragmentation.  This would make a good benchmark for me.

More generally, I'm looking for (small) programs that exhibit this
kind of behaviour: they call the compactor frequently and their memory
usage grows without bound when the compactor is disabled.

-- Damien