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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads

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Select number of GC threads dynamically based on heap usage and number of Java threads

Reviewed-by: johnc, ysr, jcoomes
This commit is contained in:
Jon Masamitsu 2011-08-09 10:16:01 -07:00
parent 098ed89645
commit 15070123fa
39 changed files with 1523 additions and 231 deletions
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32
hotspot/src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.cpp
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@ -93,6 +93,11 @@ void GCTaskThread::print_on(outputStream* st) const {
st->cr();
}
// GC workers get tasks from the GCTaskManager and execute
// them in this method. If there are no tasks to execute,
// the GC workers wait in the GCTaskManager's get_task()
// for tasks to be enqueued for execution.
void GCTaskThread::run() {
// Set up the thread for stack overflow support
this->record_stack_base_and_size();
@ -124,7 +129,6 @@ void GCTaskThread::run() {
for (; /* break */; ) {
// This will block until there is a task to be gotten.
GCTask* task = manager()->get_task(which());
// In case the update is costly
if (PrintGCTaskTimeStamps) {
timer.update();
@ -134,18 +138,28 @@ void GCTaskThread::run() {
char* name = task->name();
task->do_it(manager(), which());
manager()->note_completion(which());
if (PrintGCTaskTimeStamps) {
assert(_time_stamps != NULL, "Sanity (PrintGCTaskTimeStamps set late?)");
if (!task->is_idle_task()) {
manager()->note_completion(which());
timer.update();
if (PrintGCTaskTimeStamps) {
assert(_time_stamps != NULL,
"Sanity (PrintGCTaskTimeStamps set late?)");
GCTaskTimeStamp* time_stamp = time_stamp_at(_time_stamp_index++);
timer.update();
time_stamp->set_name(name);
time_stamp->set_entry_time(entry_time);
time_stamp->set_exit_time(timer.ticks());
GCTaskTimeStamp* time_stamp = time_stamp_at(_time_stamp_index++);
time_stamp->set_name(name);
time_stamp->set_entry_time(entry_time);
time_stamp->set_exit_time(timer.ticks());
}
} else {
// idle tasks complete outside the normal accounting
// so that a task can complete without waiting for idle tasks.
// They have to be terminated separately.
IdleGCTask::destroy((IdleGCTask*)task);
set_is_working(true);
}
// Check if we should release our inner resources.