8012241: NMT huge memory footprint, it usually leads to OOME
Summary: Enforce memory limitation on NMT to prevent JVM OOM
Reviewed-by: acorn, dcubed, minqi
--- a/hotspot/src/share/vm/services/memTracker.cpp Mon Jul 08 18:26:26 2013 -0700
+++ b/hotspot/src/share/vm/services/memTracker.cpp Thu Jul 11 13:15:12 2013 -0400
@@ -385,6 +385,7 @@
#define SAFE_SEQUENCE_THRESHOLD 30
#define HIGH_GENERATION_THRESHOLD 60
#define MAX_RECORDER_THREAD_RATIO 30
+#define MAX_RECORDER_PER_THREAD 100
void MemTracker::sync() {
assert(_tracking_level > NMT_off, "NMT is not enabled");
@@ -437,6 +438,11 @@
// means that worker thread is lagging behind in processing them.
if (!AutoShutdownNMT) {
_slowdown_calling_thread = (MemRecorder::_instance_count > MAX_RECORDER_THREAD_RATIO * _thread_count);
+ } else {
+ // If auto shutdown is on, enforce MAX_RECORDER_PER_THREAD threshold to prevent OOM
+ if (MemRecorder::_instance_count >= _thread_count * MAX_RECORDER_PER_THREAD) {
+ shutdown(NMT_out_of_memory);
+ }
}
// check _worker_thread with lock to avoid racing condition