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Code Issues Wiki Activity

[306982] - [concurrent] DsfRunnable.finalize() method increases the cost of garbage collecting 10x

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This commit is contained in:
Pawel Piech 2010-03-24 18:50:29 +00:00
parent 04709d2876
commit 1ba8d3916d
2 changed files with 57 additions and 44 deletions
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65
dsf/org.eclipse.cdt.dsf/src/org/eclipse/cdt/dsf/concurrent/DsfExecutable.java
View file

@ -14,7 +14,6 @@ import java.util.HashSet;
import java.util.Set;
import org.eclipse.cdt.dsf.internal.DsfPlugin;
import org.eclipse.cdt.dsf.internal.LoggingUtils;
import org.eclipse.core.runtime.Platform;
/**
@ -181,34 +180,38 @@ public class DsfExecutable {
return true;
}
/**
* Checks to see if the object was executed before being garbage collected.
* If not, and it's expected to have been, then output a trace message to
* that effect.
*
* @see java.lang.Object#finalize()
*/
@Override
protected void finalize() {
if (DEBUG_EXECUTOR && !fSubmitted && isExecutionRequired()) {
StringBuilder traceBuilder = new StringBuilder();
// Record the time
traceBuilder.append(DsfPlugin.getDebugTime());
traceBuilder.append(' ');
final String refstr = LoggingUtils.toString(this, false);
traceBuilder.append("DSF executable was never executed: " + refstr); //$NON-NLS-1$
final String tostr = LoggingUtils.trimTrailingNewlines(this.toString());
if (!tostr.equals(refstr)) {
traceBuilder.append(" ["); //$NON-NLS-1$
traceBuilder.append(tostr);
traceBuilder.append(']');
}
traceBuilder.append("\nCreated at:\n"); //$NON-NLS-1$
traceBuilder.append(fCreatedAt);
DsfPlugin.debug(traceBuilder.toString());
}
}
// Bug 306982
// Disable the use of finalize() method in DSF runnables tracing to avoid
// a performance penalty in garbage colleciton.
//
// /**
// * Checks to see if the object was executed before being garbage collected.
// * If not, and it's expected to have been, then output a trace message to
// * that effect.
// *
// * @see java.lang.Object#finalize()
// */
// @Override
// protected void finalize() {
// if (DEBUG_EXECUTOR && !fSubmitted && isExecutionRequired()) {
// StringBuilder traceBuilder = new StringBuilder();
//
// // Record the time
// traceBuilder.append(DsfPlugin.getDebugTime());
// traceBuilder.append(' ');
//
// final String refstr = LoggingUtils.toString(this, false);
// traceBuilder.append("DSF executable was never executed: " + refstr); //$NON-NLS-1$
// final String tostr = LoggingUtils.trimTrailingNewlines(this.toString());
// if (!tostr.equals(refstr)) {
// traceBuilder.append(" ["); //$NON-NLS-1$
// traceBuilder.append(tostr);
// traceBuilder.append(']');
// }
// traceBuilder.append("\nCreated at:\n"); //$NON-NLS-1$
// traceBuilder.append(fCreatedAt);
//
// DsfPlugin.debug(traceBuilder.toString());
// }
// }
}

36
dsf/org.eclipse.cdt.dsf/src/org/eclipse/cdt/dsf/concurrent/RequestMonitor.java
View file

@ -10,12 +10,13 @@
*******************************************************************************/
package org.eclipse.cdt.dsf.concurrent;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Executor;
import java.util.concurrent.RejectedExecutionException;
import org.eclipse.cdt.dsf.internal.DsfPlugin;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.ListenerList;
import org.eclipse.core.runtime.MultiStatus;
import org.eclipse.core.runtime.Status;
@ -101,7 +102,7 @@ public class RequestMonitor extends DsfExecutable {
*/
private final RequestMonitor fParentRequestMonitor;
private ListenerList fCancelListeners;
private List<ICanceledListener> fCancelListeners;
/**
* Status
@ -110,6 +111,8 @@ public class RequestMonitor extends DsfExecutable {
private boolean fCanceled = false;
private boolean fDone = false;
private final ICanceledListener fCanceledListener;
/**
* This field is never read by any code; its purpose is strictly to assist
* developers debug DPF code. Developer can select this field in the
@ -144,12 +147,15 @@ public class RequestMonitor extends DsfExecutable {
// this request monitor will automatically be canceled when the parent
// is canceled.
if (fParentRequestMonitor != null) {
fParentRequestMonitor.addCancelListener(
new ICanceledListener() {
public void requestCanceled(RequestMonitor rm) {
cancel();
}
});
fCanceledListener = new ICanceledListener() {
public void requestCanceled(RequestMonitor rm) {
cancel();
}
};
fParentRequestMonitor.addCancelListener(fCanceledListener);
} else {
fCanceledListener = null;
}
if (DEBUG_MONITORS) {
@ -197,13 +203,13 @@ public class RequestMonitor extends DsfExecutable {
* </p>
*/
public void cancel() {
Object[] listeners = null;
ICanceledListener[] listeners = null;
synchronized (this) {
// Check to make sure the request monitor wasn't previously canceled.
if (!fCanceled) {
fCanceled = true;
if (fCancelListeners != null) {
listeners = fCancelListeners.getListeners();
listeners = fCancelListeners.toArray(new ICanceledListener[fCancelListeners.size()]);
}
}
}
@ -211,8 +217,8 @@ public class RequestMonitor extends DsfExecutable {
// Call the listeners outside of a synchronized section to reduce the
// risk of deadlocks.
if (listeners != null) {
for (Object listener : listeners) {
((ICanceledListener)listener).requestCanceled(this);
for (ICanceledListener listener : listeners) {
listener.requestCanceled(this);
}
}
}
@ -237,7 +243,7 @@ public class RequestMonitor extends DsfExecutable {
*/
public synchronized void addCancelListener(ICanceledListener listener) {
if (fCancelListeners == null) {
fCancelListeners = new ListenerList();
fCancelListeners = new ArrayList<ICanceledListener>(1);
}
fCancelListeners.add(listener);
}
@ -275,6 +281,10 @@ public class RequestMonitor extends DsfExecutable {
// causes a memory leak.
fCancelListeners = null;
if (fParentRequestMonitor != null) {
fParentRequestMonitor.removeCancelListener(fCanceledListener);
}
try {
fExecutor.execute(new DsfRunnable() {
public void run() {