Mercurial > hg > truffle
diff src/share/vm/runtime/vm_version.hpp @ 10:28372612af5e
6362677: Change parallel GC collector default number of parallel GC threads.
Summary: Use the same default number of GC threads as used by ParNewGC and ConcMarkSweepGC (i.e., the 5/8th rule).
Reviewed-by: ysr, tonyp
| author | jmasa |
|---|---|
| date | Fri, 22 Feb 2008 17:17:14 -0800 |
| parents | a61af66fc99e |
| children | d1605aabd0a1 |
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--- a/src/share/vm/runtime/vm_version.hpp Thu Feb 21 11:03:54 2008 -0800 +++ b/src/share/vm/runtime/vm_version.hpp Fri Feb 22 17:17:14 2008 -0800 @@ -36,6 +36,12 @@ static int _vm_minor_version; static int _vm_build_number; static bool _initialized; + static int _parallel_worker_threads; + static bool _parallel_worker_threads_initialized; + + static unsigned int nof_parallel_worker_threads(unsigned int num, + unsigned int dem, + unsigned int switch_pt); public: static void initialize(); @@ -69,4 +75,13 @@ // subclasses should define new versions to hide this one as needed. Note // that the O/S may support more sizes, but at most this many are used. static uint page_size_count() { return 2; } + + // Returns the number of parallel threads to be used for VM + // work. If that number has not been calculated, do so and + // save it. Returns ParallelGCThreads if it is set on the + // command line. + static unsigned int parallel_worker_threads(); + // Calculates and returns the number of parallel threads. May + // be VM version specific. + static unsigned int calc_parallel_worker_threads(); };