|
import java.io.PrintWriter;
import java.lang.instrument.Instrumentation;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryPoolMXBean;
import java.lang.management.MemoryUsage;
import java.lang.management.ThreadMXBean;
import java.util.List;
public class MainClass {
public static void main(String[] a){
//premain();
}
public static void premain(final Instrumentation inst) {
Runtime.getRuntime().addShutdownHook(new Thread() {
public void run() {
try {
PrintWriter out = new PrintWriter(System.err);
ThreadMXBean tb = ManagementFactory.getThreadMXBean();
out.printf("Current thread count: %d%n", tb.getThreadCount());
out.printf("Peak thread count: %d%n", tb.getPeakThreadCount());
List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
for (MemoryPoolMXBean pool : pools) {
MemoryUsage peak = pool.getPeakUsage();
out.printf("Peak %s memory used: %,d%n", pool.getName(), peak.getUsed());
out.printf("Peak %s memory reserved: %,d%n", pool.getName(), peak.getCommitted());
}
Class[] loaded = inst.getAllLoadedClasses();
out.println("Loaded classes:");
for (Class c : loaded)
out.println(c.getName());
out.close();
} catch (Throwable t) {
System.err.println("Exception in agent: " + t);
}
}
});
}
}
|
