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added load and deadlock detector in Memory util

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This commit is contained in:
orbiter 2013-07-16 10:49:20 +02:00
parent 290e24564b
commit b71d13a014
1 changed files with 34 additions and 2 deletions
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34
source/net/yacy/cora/util/Memory.java
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@ -20,6 +20,9 @@
package net.yacy.cora.util; package net.yacy.cora.util;
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadInfo;
public class Memory { public class Memory {
private static final Runtime runtime = Runtime.getRuntime(); private static final Runtime runtime = Runtime.getRuntime();
@ -45,7 +48,7 @@ public class Memory {
* @return bytes * @return bytes
*/ */
public static final long maxMemory() { public static final long maxMemory() {
return runtime.maxMemory(); return runtime.maxMemory(); // can be Long.MAX_VALUE if unlimited
} }
/** /**
@ -64,4 +67,33 @@ public class Memory {
return total() - free(); return total() - free();
} }
/**
* get the system load within the last minute
* @return the system load or a negative number if the load is not available
*/
public static double load() {
return ManagementFactory.getOperatingSystemMXBean().getSystemLoadAverage();
}
/**
* find out the number of thread deadlocks. WARNING: this is a time-consuming task
* @return the number of deadlocked threads
*/
public static long deadlocks() {
long[] deadlockIDs = ManagementFactory.getThreadMXBean().findDeadlockedThreads();
if (deadlockIDs == null) return 0;
return deadlockIDs.length;
}
/**
* write deadlocked threads as to the log as warning
*/
public static void logDeadlocks() {
long[] deadlockIDs = ManagementFactory.getThreadMXBean().findDeadlockedThreads();
if (deadlockIDs == null) return;
ThreadInfo[] infos = ManagementFactory.getThreadMXBean().getThreadInfo(deadlockIDs, true, true);
for (ThreadInfo ti : infos) {
ConcurrentLog.warn("DEADLOCKREPORT", ti.toString());
}
}
} }