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6362677: Change parallel GC collector default number of parallel GC threads

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Use the same default number of GC threads as used by ParNewGC and ConcMarkSweepGC (i.e., the 5/8th rule).

Reviewed-by: ysr, tonyp
This commit is contained in:
Jon Masamitsu 2008-02-22 17:17:14 -08:00
parent 74f243990c
commit 63f1de52fc
8 changed files with 174 additions and 81 deletions
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16
hotspot/src/cpu/sparc/vm/vm_version_sparc.cpp
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@ -28,6 +28,12 @@
int VM_Version::_features = VM_Version::unknown_m;
const char* VM_Version::_features_str = "";
bool VM_Version::is_niagara1_plus() {
// This is a placeholder until the real test is determined.
return is_niagara1() &&
(os::processor_count() > maximum_niagara1_processor_count());
}
void VM_Version::initialize() {
_features = determine_features();
PrefetchCopyIntervalInBytes = prefetch_copy_interval_in_bytes();
@ -160,3 +166,13 @@ void VM_Version::allow_all() {
void VM_Version::revert() {
_features = saved_features;
}
unsigned int VM_Version::calc_parallel_worker_threads() {
unsigned int result;
if (is_niagara1_plus()) {
result = nof_parallel_worker_threads(5, 16, 8);
} else {
result = nof_parallel_worker_threads(5, 8, 8);
}
return result;
}