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* Set libgc's initial heap size to 384 MiB to prevent garbage

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collection in most cases (and therefore its performance overhead).
This commit is contained in:
Eelco Dolstra 2010-10-29 13:11:50 +00:00
parent 0c4828ea05
commit 14fbf85380
1 changed files with 12 additions and 0 deletions
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src/libmain/shared.cc
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@ -353,6 +353,18 @@ int main(int argc, char * * argv)
GC_INIT();
GC_oom_fn = oomHandler;
/* Set the initial heap size to something fairly big (384 MiB) so
that in most cases we don't need to garbage collect at all.
(Collection has a fairly significant overhead, some.) The heap
size can be overriden through libgc's GC_INITIAL_HEAP_SIZE
environment variable. We should probably also provide a
nix.conf setting for this. Note that GC_expand_hp() causes a
lot of virtual, but not physical (resident) memory to be
allocated. This might be a problem on systems that don't
overcommit. */
if (!getenv("GC_INITIAL_HEAP_SIZE"))
GC_expand_hp(384000000);
#endif
try {