forked from OSchip/llvm-project
7d45451a0d
In: http://lists.llvm.org/pipermail/openmp-dev/2015-August/000858.html, a performance issue was found with libomp's task dependencies. The task dependencies hash table has an issue with collisions. The current table size is a power of two. This combined with the current hash function causes a large number of collisions to occurr. Also, the current size (64) is too small for larger applications so the table size is increased. This patch creates a two level hash table approach for task dependencies. The implicit task is considered the "master" or "top-level" task which has a large static sized hash table (997), and nested tasks will have smaller hash tables (97). Prime numbers were chosen to help reduce collisions. Differential Revision: http://reviews.llvm.org/D16640 llvm-svn: 259113 |
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| LICENSE.txt | ||