[m-rev.] diff: Increase HBLKSIZE in BoehmGC for parallel grades.

[Julien Fischer]

On Wed, 8 Dec 2010, Paul Bone wrote:

>
> When bulding the garbage collector in a parallel grade increase the
> thread-local free list size by increasing HBLKSIZE.  This causes memory
> allocation to access global resources less often improving parallel
> performance.
>
> Mmake.common.in:
>    As above.
>
> Index: Mmake.common.in
> ===================================================================
> RCS file: /home/mercury1/repository/mercury/Mmake.common.in,v
> retrieving revision 1.97
> diff -u -p -b -r1.97 Mmake.common.in
> --- Mmake.common.in	10 Oct 2009 10:44:13 -0000	1.97
> +++ Mmake.common.in	8 Dec 2010 03:50:43 -0000
> @@ -150,7 +150,8 @@ BOEHM_CFLAGS = @ENABLE_BOEHM_LARGE_CONFI
> # Additional options to pass to the C compiler when building Boehm-GC for
> # threads.
> BOEHM_CFLAGS_FOR_THREADS = @ENABLE_BOEHM_THREAD_LOCAL_ALLOC@ \
> -	@ENABLE_BOEHM_PARALLEL_MARK@
> +	@ENABLE_BOEHM_PARALLEL_MARK@ \
> +	-DHBLKSIZE=32768 -DCPP_LOG_HBLKSIZE=15

I suggest adding a comment above that definition describing what
HBLKSIZE and CPP_LOG_HBLKSIZE are.

Julien.
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