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6690928: Use spinning in combination with yields for workstealing termination

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Substitute a spin loop for most calls to yield() to reduce the stress on the system.

Reviewed-by: tonyp
This commit is contained in:
Jon Masamitsu 2009-02-08 13:18:01 -08:00
parent 61181babf1
commit 3b5d6a04dd
9 changed files with 116 additions and 4 deletions
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14
hotspot/src/share/vm/utilities/taskqueue.hpp
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@ -426,12 +426,20 @@ public:
// A class to aid in the termination of a set of parallel tasks using
// TaskQueueSet's for work stealing.
#undef TRACESPINNING
class ParallelTaskTerminator: public StackObj {
private:
int _n_threads;
TaskQueueSetSuper* _queue_set;
int _offered_termination;
#ifdef TRACESPINNING
static uint _total_yields;
static uint _total_spins;
static uint _total_peeks;
#endif
bool peek_in_queue_set();
protected:
virtual void yield();
@ -462,6 +470,12 @@ public:
// the terminator is finished.
void reset_for_reuse();
#ifdef TRACESPINNING
static uint total_yields() { return _total_yields; }
static uint total_spins() { return _total_spins; }
static uint total_peeks() { return _total_peeks; }
static void print_termination_counts();
#endif
};
#define SIMPLE_STACK 0