Author: eelco
Date: Fri Oct 29 13:11:50 2010
New Revision: 24524
URL: https://svn.nixos.org/websvn/nix/?rev=24524&sc=1
Log:
* Set libgc's initial heap size to 384 MiB to prevent garbage
collection in most cases (and therefore its performance overhead).
Modified:
nix/branches/gc/src/libmain/shared.cc
Modified: nix/branches/gc/src/libmain/shared.cc
==============================================================================
--- nix/branches/gc/src/libmain/shared.cc Fri Oct 29 12:41:50 2010
(r24523)
+++ nix/branches/gc/src/libmain/shared.cc Fri Oct 29 13:11:50 2010
(r24524)
@@ -353,6 +353,18 @@
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 {
_______________________________________________
nix-commits mailing list
[email protected]
http://mail.cs.uu.nl/mailman/listinfo/nix-commits
