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comparison src/share/vm/runtime/vm_version.hpp @ 10:28372612af5e

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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
comparison
equal deleted inserted replaced
9:173195ff483a 10:28372612af5e
34 static unsigned int _logical_processors_per_package; 34 static unsigned int _logical_processors_per_package;
35 static int _vm_major_version; 35 static int _vm_major_version;
36 static int _vm_minor_version; 36 static int _vm_minor_version;
37 static int _vm_build_number; 37 static int _vm_build_number;
38 static bool _initialized; 38 static bool _initialized;
39 static int _parallel_worker_threads;
40 static bool _parallel_worker_threads_initialized;
41
42 static unsigned int nof_parallel_worker_threads(unsigned int num,
43 unsigned int dem,
44 unsigned int switch_pt);
39 public: 45 public:
40 static void initialize(); 46 static void initialize();
41 47
42 // Name 48 // Name
43 static const char* vm_name(); 49 static const char* vm_name();
67 // Number of page sizes efficiently supported by the hardware. Most chips now 73 // Number of page sizes efficiently supported by the hardware. Most chips now
68 // support two sizes, thus this default implementation. Processor-specific 74 // support two sizes, thus this default implementation. Processor-specific
69 // subclasses should define new versions to hide this one as needed. Note 75 // subclasses should define new versions to hide this one as needed. Note
70 // that the O/S may support more sizes, but at most this many are used. 76 // that the O/S may support more sizes, but at most this many are used.
71 static uint page_size_count() { return 2; } 77 static uint page_size_count() { return 2; }
78
79 // Returns the number of parallel threads to be used for VM
80 // work. If that number has not been calculated, do so and
81 // save it. Returns ParallelGCThreads if it is set on the
82 // command line.
83 static unsigned int parallel_worker_threads();
84 // Calculates and returns the number of parallel threads. May
85 // be VM version specific.
86 static unsigned int calc_parallel_worker_threads();
72 }; 87 };