ntdll: Fixed some heap allocation stalls

Steaphan Greene steaphan at gmail.com
Fri Nov 2 16:35:58 CDT 2012

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(-)

Steaphan Greene<steaphan at gmail.com>

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