Running a game in wine showed it performing terribly. I traced this to the
fact that it allocates and deallocates tiny memory chunks over and over (I
suspect it's in C++ and passing things by value everywhere). This led to
huge stalls because the heap bins weren't fine-grained enough (these
differed in size in steps of 8 bytes, but the bins differed by 16+, so it
spent a lot of time searching each bin for a bigger block). I added more
fine-grained sizes to the smaller end of this, and now it runs faster in
wine than it does natively. :)
This was run on Debian squeeze, amd64.
Note, this is my first submission to wine in nearly 15 years. So, of
course, everything has changed with how this works now. Hope I have this
all right.
---
dlls/ntdll/heap.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/dlls/ntdll/heap.c b/dlls/ntdll/heap.c
index a9044714..eb7406b 100644
--- a/dlls/ntdll/heap.c
+++ b/dlls/ntdll/heap.c
@@ -116,7 +116,9 @@ C_ASSERT( sizeof(ARENA_LARGE) % LARGE_ALIGNMENT == 0 );
/* Max size of the blocks on the free lists */
static const SIZE_T HEAP_freeListSizes[] =
{
- 0x10, 0x20, 0x30, 0x40, 0x60, 0x80, 0x100, 0x200, 0x400, 0x1000, ~0UL
+ 0x10, 0x18, 0x20, 0x28, 0x30, 0x38, 0x40, 0x48, 0x50, 0x58, 0x60, 0x68,
+ 0x70, 0x78, 0x80, 0x88, 0x90, 0x98, 0xA0, 0xA8, 0xB0, 0xB8, 0xC0, 0xC8,
+ 0xD0, 0xD8, 0xE0, 0E88, 0xF0, 0xF8, 0x100, 0x200, 0x400, 0x1000, ~0UL
};
#define HEAP_NB_FREE_LISTS
(sizeof(HEAP_freeListSizes)/sizeof(HEAP_freeListSizes[0]))
