The minimum size heuristic for the garbage collector's heap, before it starts collecting, was last updated over ten years ago. It currently has a hard upper limit of 128MB. This is too low for current machines where 8GB of RAM is normal. So, it seems to me, a new upper bound of 1GB would be appropriate.
Compile times of large C++ projects improve by over 10% due to this change. What do you think? Thanks. diff --git a/gcc/ggc-common.c b/gcc/ggc-common.c index b4c36fb0bbd4..91e121d7dafe 100644 --- a/gcc/ggc-common.c +++ b/gcc/ggc-common.c @@ -810,7 +810,7 @@ ggc_min_heapsize_heuristic (void) phys_kbytes = MIN (phys_kbytes, limit_kbytes); phys_kbytes = MAX (phys_kbytes, 4 * 1024); - phys_kbytes = MIN (phys_kbytes, 128 * 1024); + phys_kbytes = MIN (phys_kbytes, 1000 * 1024); return phys_kbytes; } -- Markus
