Does somebody have the knowledge about LoggingSupport.isAvailable()
and the lazy PlatformLogger initialization (JavaLogger are only used when j.u.l
is initialized) ?
What's happening if LoggingSupport.isAvailable() returns false in your patch ?
- LevelEnum instances are incorrectly initialized:object field is null !
- PlatformLogger is then broken ... as Level object are required by j.u.l calls
To fix both problems, moving theLevelEnum into JavaLogger should help and
check nulls onLevelEnum.object field.
Thanks for your feedback,
Laurent
2013/3/21 Peter Levart <peter.lev...@gmail.com
<mailto:peter.lev...@gmail.com>>
On 03/21/2013 12:12 PM, Laurent Bourgès wrote:
Here is an improved patch tested on JDK7u13 and JDK8 internal
build on my
machine linux x64:
http://jmmc.fr/~bourgesl/share/webrev-8010309/
<http://jmmc.fr/%7Ebourgesl/share/webrev-8010309/>
FYI, I removed completely the Map<Integer, Object>
levelObjects and used
two arrays to perform the PlatformLogger's level (int) to
j.u.l.Level
mapping:
I decided to keep it simple as possible (no enum ...) and
used a switch
case based on current level occurences:
Hi Laurent,
In my experience enums are just the right and most compact tool
for coding such constant associations. Here's a quick try
(ripping off your optimized switch ;-):
http://dl.dropbox.com/u/101777488/jdk8-tl/PlatformLogger/webrev.01/index.html
...it adds 12 LOC to the original PlatformLogger and is 43 LOC
less tha your patch. In addition:
- only one switch instead of two (to maintain)
- no parallel IDX_ constants
What do you think?
Regards, Peter
510 /**
511 * Return the corresponding j.u.l.Level instance
512 * @param level PlatformLogger level as integer
513 * @return Object (j.u.l.Level instance) or
null if no
matching level
514 */
515 private static Object getLevel(final int level) {
516 if (levelObjects == null) {
517 return null;
518 }
519 // higher occurences first (finest, fine,
finer, info)
520 // based on isLoggable(level) calls
(03/20/2013)
521 // in jdk project only (including generated
sources)
522 switch (level) {
523 case FINEST : return
levelObjects[IDX_FINEST];
// 116 + 2257 matches in generated files
524 case FINE : return
levelObjects[IDX_FINE]; // 270
525 case FINER : return
levelObjects[IDX_FINER]; // 157
526 case INFO : return
levelObjects[IDX_INFO]; // 39
527 case WARNING : return
levelObjects[IDX_WARNING]; // 12
528 case CONFIG : return
levelObjects[IDX_CONFIG]; // 6
529 case SEVERE : return
levelObjects[IDX_SEVERE]; // 1
530 case OFF : return
levelObjects[IDX_OFF]; // 0
531 case ALL : return
levelObjects[IDX_ALL]; // 0
532 default : return null;
533 }
534 }
I enhanced the PlatformLoggerTest class also and figured out
that TLAB
optimized Integer allocations but I think the patch is still
useful.
Can you have a look to the patch ?
Should I write a jtreg test (performance / GC issue) ?
Cheers,
Laurent
2013/3/20 Mandy Chung <mandy.ch...@oracle.com
<mailto:mandy.ch...@oracle.com>>
Hi Laurent,
Thank you for signing the OCA. Your contribution is very
welcome. You
can submit a patch for this bug (see [1]) to Core
libraries group which
owns logging. Jim Gish and I will sponsor it.
Thanks
Mandy
[1] http://openjdk.java.net/contribute/
On 3/20/2013 5:45 AM, Laurent Bourgès wrote:
Hi mandy,
Do you want me to propose an improved patch to remove the
former Map and
fix the getLevel() method ? or you prefer fix on your own ?
Is it better to discuss the fix on the bug database
(still not visible) ?
Laurent
2013/3/19 Mandy Chung <mandy.ch...@oracle.com
<mailto:mandy.ch...@oracle.com>>
Hi Laurent,
Thanks for the contribution. I agree that the map
can be replaced with a
direct mapping from a int value to Level object and
avoid the autoboxing
conversion.
I have filed a bug to track this and target this for
JDK8:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=
8010309
Thanks
Mandy
On 3/19/13 5:19 AM, Laurent Bourgès wrote:
Dear all,
I run recently netbeans profiler on my swing
application (Aspro2:http://www.jmmc.fr/aspro
) under linux x64 platform and figured out a
performance and waste issue related to PlatformLogger.
Actually, the JavaLogger implementation uses a
Map<Integer, Object>
levelObjects to store mapping between
PlatformLogger's levels (int) and JUL
Level instances.
However, the isLoggable(int level) method is highly
used by awt project and
other JDK projects and it leads to many Integer
allocations as autoboxing
converts the level as int to an Integer instance used
by the Map.get() call.
/**
* JavaLogger forwards all the calls to its
corresponding
* java.util.logging.Logger object.
*/
static class JavaLogger extends LoggerProxy {
private static final* Map<Integer, Object>*
levelObjects = new
HashMap<>();
...
public boolean isLoggable(*int level*) {
return
LoggingSupport.isLoggable(javaLogger, *
levelObjects.get(level)*);
}
}
I wrote a simple test to illustrate that performance
/ waste problem:
PlatformLoggerTest that simply performs 1 million
DISABLED log statements:
if (log.isLoggable(PlatformLogger.FINEST)) {
log.finest("test
PlatformLogger.FINEST");
}
As you can see in screenshots:
- 5 million Integer instances are allocated
- Integer.valueOf(int) is called 5 million times
(autoboxing)
- HashMap.get() represents 30% of the test time
- patched PlatformLogger is 3x times faster
[jvm options: -Xms8m -Xmx8m -verbose:gc]
I suggest you to use an alternative way to map
PlatformLogger's levels
(int) and JUL Level instances to fix that performance
/ memory issue: I
added the getLevel(int level) method that performs a
switch case to return
the corresponding Level object (quick and dirty
solution).
I advocate this is not a very clean solution but I
prefer efficiency here:
any better solution may be appropriate to avoid at
least Integer allocation
and maybe enhance performance.
Best regards,
Laurent Bourgès
PS: here is the patch as text:
# This patch file was generated by NetBeans IDE
# It uses platform neutral UTF-8 encoding and \n
newlines.
--- PlatformLogger.java (6767)
+++ PlatformLogger.java (6768)
@@ -468,31 +468,13 @@
* java.util.logging.Logger object.
*/
static class JavaLogger extends LoggerProxy {
- /** Note: using Integer keys leads to a lot
of new Integer
instances !! */
- private static final Map<Integer, Object>
levelObjects = new
HashMap<>();
- /** fastest mapping to Level instances from
PlatformLogger level
as integer */
- private static final Object[] fastLevelObjects;
-
-
+ private static final Map<Integer, Object>
levelObjects =
+ new HashMap<>();
+
static {
if (LoggingSupport.isAvailable()) {
// initialize the map to Level objects
getLevelObjects();
-
- // initialize the fastLevelObjects:
- fastLevelObjects = new Object[] {
- LoggingSupport.parseLevel(getLevelName(OFF)), //
0
- LoggingSupport.parseLevel(getLevelName(SEVERE)), //
1
- LoggingSupport.parseLevel(getLevelName(WARNING)), //
2
- LoggingSupport.parseLevel(getLevelName(INFO)), //
3
- LoggingSupport.parseLevel(getLevelName(CONFIG)), //
4
- LoggingSupport.parseLevel(getLevelName(FINE)), //
5
- LoggingSupport.parseLevel(getLevelName(FINER)), //
6
- LoggingSupport.parseLevel(getLevelName(FINEST)), //
7
- LoggingSupport.parseLevel(getLevelName(ALL)) //
8
- };
- } else {
- fastLevelObjects = null; // check null
}
}
@@ -515,7 +497,7 @@
this.javaLogger =
LoggingSupport.getLogger(name);
if (level != 0) {
// level has been updated and so
set the Logger's level
- LoggingSupport.setLevel(javaLogger, getLevel(level));
+ LoggingSupport.setLevel(javaLogger,
levelObjects.get(level));
}
}
@@ -526,11 +508,11 @@
* not be updated.
*/
void doLog(int level, String msg) {
- LoggingSupport.log(javaLogger,
getLevel(level), msg);
+ LoggingSupport.log(javaLogger,
levelObjects.get(level), msg);
}
void doLog(int level, String msg, Throwable
t) {
- LoggingSupport.log(javaLogger,
getLevel(level), msg, t);
+ LoggingSupport.log(javaLogger,
levelObjects.get(level), msg,
t);
}
void doLog(int level, String msg, Object...
params) {
@@ -544,12 +526,12 @@
for (int i = 0; i < len; i++) {
sparams [i] =
String.valueOf(params[i]);
}
- LoggingSupport.log(javaLogger,
getLevel(level), msg, sparams);
+ LoggingSupport.log(javaLogger,
levelObjects.get(level), msg,
sparams);
}
boolean isEnabled() {
Object level =
LoggingSupport.getLevel(javaLogger);
- return level == null ||
level.equals(getLevel(OFF)) == false;
+ return level == null ||
level.equals(levelObjects.get(OFF)) ==
false;
}
int getLevel() {
@@ -566,34 +548,12 @@
void setLevel(int newLevel) {
levelValue = newLevel;
- LoggingSupport.setLevel(javaLogger,
getLevel(newLevel));
+ LoggingSupport.setLevel(javaLogger,
levelObjects.get(newLevel));
}
public boolean isLoggable(int level) {
- return
LoggingSupport.isLoggable(javaLogger, getLevel(level));
+ return LoggingSupport.isLoggable(javaLogger,
levelObjects.get(level));
}
-
- /**
- * Return the corresponding level object
(fastest implementation)
- * @param level PlatformLogger level as
primitive integer
- * @return Object (JUL Level instance)
- */
- private static Object getLevel(final int
level) {
- // higher occurences first (finest,
fine, finer, info):
- switch (level) {
- case FINEST : return
fastLevelObjects[7];
- case FINE : return
fastLevelObjects[5];
- case FINER : return
fastLevelObjects[6];
- case INFO : return
fastLevelObjects[3];
- case CONFIG : return
fastLevelObjects[4];
- case WARNING : return
fastLevelObjects[2];
- case SEVERE : return
fastLevelObjects[1];
- case ALL : return
fastLevelObjects[8];
- case OFF : return
fastLevelObjects[0];
- default : return null;
- }
- }
-
}
private static String getLevelName(int level) {
