[Poppler-bugs] [Bug 7910] New: Custom memory allocator to improve loading time by ~25%

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https://bugs.freedesktop.org/show_bug.cgi?id=7910          
     
           Summary: Custom memory allocator to improve loading time by ~25%
           Product: poppler
           Version: unspecified
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: general
        AssignedTo: poppler-bugs at lists.freedesktop.org
        ReportedBy: kkowalczyk at gmail.com


Allocation (malloc()/free() calls) account for a lot of time used by poppler.

Custom memory allocator uses free lists and allocates memory in chunks for the
most frequently allocated memory sizes (in my testing about 90% of allocations
are served by the 4 sizes covered by the patch).

The code is optional and only used when USE_FAST_ALLOC symbol is defined so it
can be easily turned on and off.

In my testing with this patch loading ~8MB pdf file (PDFReference1.6.pdf
available from Adobe website)is speed up by ~25% (this is on top of my previous
optimizations; improvement should be even better against current poppler CVS
sources).

Code is copiously commented and the algorithm used rahter simple.          
     
     
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