private static void checkGarbageCollectionNotificationInfoContent(
GarbageCollectionNotificationInfo notif) throws Exception {
System.out.println("GC notification for " + notif.getGcName());
System.out.print("Action: " + notif.getGcAction());
System.out.println(" Cause: " + notif.getGcCause());
GcInfo info = notif.getGcInfo();
System.out.print("GC Info #" + info.getId());
System.out.print(" start:" + info.getStartTime());
System.out.print(" end:" + info.getEndTime());
System.out.println(" (" + info.getDuration() + "ms)");
Map<String, MemoryUsage> usage = info.getMemoryUsageBeforeGc();
List<String> pnames = new ArrayList<String>();
for (Map.Entry entry : usage.entrySet()) {
String poolname = (String) entry.getKey();
pnames.add(poolname);
MemoryUsage busage = (MemoryUsage) entry.getValue();
MemoryUsage ausage = (MemoryUsage) info.getMemoryUsageAfterGc().get(poolname);
if (ausage == null) {
throw new RuntimeException("After Gc Memory does not exist" + " for " + poolname);
}
System.out.println("Usage for pool " + poolname);
System.out.println(" Before GC: " + busage);
System.out.println(" After GC: " + ausage);
}
// check if memory usage for all memory pools are returned
List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
for (MemoryPoolMXBean p : pools) {
if (!pnames.contains(p.getName())) {
throw new RuntimeException(
"GcInfo does not contain " + "memory usage for pool " + p.getName());
}
}
}
/**
* Prints the verbose GC log to System.out to list the memory usage of all memory pools as well as
* the GC statistics.
*/
public void printVerboseGc() {
System.out.println("Uptime: " + formatMillis(rmbean.getUptime()));
System.out.println("Heap usage: " + mmbean.getHeapMemoryUsage());
System.out.println("Non-Heap memory usage: " + mmbean.getNonHeapMemoryUsage());
for (GarbageCollectorMXBean gc : gcmbeans) {
System.out.print(" [" + gc.getName() + ": ");
System.out.print("Count=" + gc.getCollectionCount());
System.out.print(" GCTime=" + formatMillis(gc.getCollectionTime()));
System.out.print("]");
}
System.out.println();
for (MemoryPoolMXBean p : pools) {
System.out.print(" [" + p.getName() + ":");
MemoryUsage u = p.getUsage();
System.out.print(" Used=" + formatBytes(u.getUsed()));
System.out.print(" Committed=" + formatBytes(u.getCommitted()));
System.out.println("]");
}
}