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/*
* @test
* @bug 4858522
* @summary Basic unit test of HotspotRuntimeMBean.getSafepointSyncTime()
* @author Steve Bohne
*/
/*
* This test is just a sanity check and does not check for the correct value.
*/
import sun.management.*;
public class GetSafepointSyncTime {
private static HotspotRuntimeMBean mbean =
(HotspotRuntimeMBean)ManagementFactoryHelper.getHotspotRuntimeMBean();
private static final long NUM_THREAD_DUMPS = 300;
// Careful with these values.
private static final long MIN_VALUE_FOR_PASS = 1;
private static final long MAX_VALUE_FOR_PASS = Long.MAX_VALUE;
public static void main(String args[]) throws Exception {
long count = mbean.getSafepointCount();
long value = mbean.getSafepointSyncTime();
// Thread.getAllStackTraces() should cause safepoints.
// If this test is failing because it doesn't,
// MIN_VALUE_FOR_PASS should be reset to 0
for (int i = 0; i < NUM_THREAD_DUMPS; i++) {
Thread.getAllStackTraces();
}
long count1 = mbean.getSafepointCount();
long value1 = mbean.getSafepointSyncTime();
System.out.format("Safepoint count=%d (diff=%d), sync time=%d ms (diff=%d)%n",
count1, count1-count, value1, value1-value);
if (value1 < MIN_VALUE_FOR_PASS || value1 > MAX_VALUE_FOR_PASS) {
throw new RuntimeException("Safepoint sync time " +
"illegal value: " + value1 + " ms " +
"(MIN = " + MIN_VALUE_FOR_PASS + "; " +
"MAX = " + MAX_VALUE_FOR_PASS + ")");
}
for (int i = 0; i < NUM_THREAD_DUMPS; i++) {
Thread.getAllStackTraces();
}
long count2 = mbean.getSafepointCount();
long value2 = mbean.getSafepointSyncTime();
System.out.format("Safepoint count=%d (diff=%d), sync time=%d ms (diff=%d)%n",
count2, count2-count1, value2, value2-value1);
if (value2 <= value1) {
throw new RuntimeException("Safepoint sync time " +
"did not increase " +
"(value1 = " + value1 + "; " +
"value2 = " + value2 + ")");
}
System.out.println("Test passed.");
}
}