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T5: ClasspathResource and performance

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T5: ClasspathResource and performance

by Christiansen Merel :: Rate this Message:

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Hello out there,

We're running a quite busy website with tapestry 5.0.18 and we're
hitting a performance problem with the ClasspathResource class.

We're using classpath asset and none of them is localised. For each
hit on a page using a classpath asset, we end having 2 missed queries
on the ClassLoader for potential localized version of the asset. It
does not really slow down the application throughput but we end with
an __huge__ CPU consumption.

The javacore stack shows numerous threads scanning jar files:

3XMTHREADINFO      "[ACTIVE] ExecuteThread: '2' for queue:
'weblogic.kernel.Default (self-tuning)'" (TID:0x3700E400,
sys_thread_t:0x3393D030, state:B, native ID:0x009AB0B3) prio=5
4XESTACKTRACE          at
java/util/zip/ZipFile.getEntry(ZipFile.java:287(Compiled Code))
4XESTACKTRACE          at
java/util/jar/JarFile.getEntry(JarFile.java:283(Compiled Code))
4XESTACKTRACE          at
java/util/jar/JarFile.getJarEntry(JarFile.java:266(Compiled Code))
4XESTACKTRACE          at
sun/misc/URLClassPath$JarLoader.getResource(URLClassPath.java:949(Compiled
Code))
4XESTACKTRACE          at
sun/misc/URLClassPath$JarLoader.findResource(URLClassPath.java:938(Compiled
Code))
4XESTACKTRACE          at
sun/misc/URLClassPath.findResource(URLClassPath.java:299(Compiled
Code))
4XESTACKTRACE          at
java/net/URLClassLoader$3.run(URLClassLoader.java:784(Compiled Code))
4XESTACKTRACE          at
java/security/AccessController.doPrivileged(AccessController.java:219)
4XESTACKTRACE          at
java/net/URLClassLoader.findResource(URLClassLoader.java:781(Compiled
Code))
4XESTACKTRACE          at
java/lang/ClassLoader.getResource(ClassLoader.java:420(Compiled Code))
4XESTACKTRACE          at
java/lang/ClassLoader.getResource(ClassLoader.java:415(Compiled Code))
4XESTACKTRACE          at
java/lang/ClassLoader.getResource(ClassLoader.java:415(Compiled Code))
4XESTACKTRACE          at
weblogic/utils/classloaders/GenericClassLoader.getResourceInternal(GenericClassLoader.java:170(Compiled
Code))
4XESTACKTRACE          at
weblogic/utils/classloaders/GenericClassLoader.getResource(GenericClassLoader.java:187(Compiled
Code))
4XESTACKTRACE          at
weblogic/utils/classloaders/FilteringClassLoader.getResourceInternal(FilteringClassLoader.java:89(Compiled
Code))
4XESTACKTRACE          at
weblogic/utils/classloaders/GenericClassLoader.getResourceInternal(GenericClassLoader.java:155(Compiled
Code))
4XESTACKTRACE          at
weblogic/utils/classloaders/GenericClassLoader.getResource(GenericClassLoader.java:187(Compiled
Code))
4XESTACKTRACE          at
java/lang/ClassLoader.getResource(ClassLoader.java:415(Compiled Code))
4XESTACKTRACE          at
weblogic/utils/classloaders/GenericClassLoader.getResource(GenericClassLoader.java:190(Compiled
Code))
4XESTACKTRACE          at
weblogic/utils/classloaders/ChangeAwareClassLoader.getResource(ChangeAwareClassLoader.java:118(Compiled
Code))
4XESTACKTRACE          at
org/apache/tapestry5/ioc/internal/util/ClasspathResource.toURL(ClasspathResource.java:59(Compiled
Code))
4XESTACKTRACE          at
org/apache/tapestry5/ioc/internal/util/AbstractResource.exists(AbstractResource.java:137(Compiled
Code))
4XESTACKTRACE          at
org/apache/tapestry5/ioc/internal/util/AbstractResource.forLocale(AbstractResource.java:100(Compiled
Code))
4XESTACKTRACE          at
org/apache/tapestry5/internal/services/AssetSourceImpl.findRelativeAsset(AssetSourceImpl.java:99(Compiled
Code))
4XESTACKTRACE          at
org/apache/tapestry5/internal/services/AssetSourceImpl.getAsset(AssetSourceImpl.java:93(Compiled
Code))
4XESTACKTRACE          at
$AssetSource_124955c0e4c.getAsset($AssetSource_124955c0e4c.java(Compiled
Code))
4XESTACKTRACE          at
org/apache/tapestry5/internal/transform/AbstractIncludeAssetWorker$1.perform(AbstractIncludeAssetWorker.java:79(Compiled
Code))
4XESTACKTRACE          at
fr/poleemploi/d2i/tapestry/navigation/unifiee/components/Bandeau.setupRender(Bandeau.java(Compiled
Code))

The stack comes from weblogic/aix run but the problem is the same on
other platforms as well.

Does anyone has ever experienced such problems ?

The performance penalty seems to be located in the
AbstractResource.forLocale() method, especially the potential.exists()
call. This part of code haven't evolved with the 5.1.x version.

Does anybody have any idea on how to get around this problem ?

Thanks in advance

--
ChristianZen

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Re: T5: ClasspathResource and performance

by Ulrich Stärk :: Rate this Message:

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Doesn't limiting the supported locales to just the ones you support help?

http://tapestry.apache.org/tapestry5.0/guide/conf.html

Uli

Am 29.10.2009 19:39 schrieb Christiansen Merel:

> Hello out there,
>
> We're running a quite busy website with tapestry 5.0.18 and we're
> hitting a performance problem with the ClasspathResource class.
>
> We're using classpath asset and none of them is localised. For each
> hit on a page using a classpath asset, we end having 2 missed queries
> on the ClassLoader for potential localized version of the asset. It
> does not really slow down the application throughput but we end with
> an __huge__ CPU consumption.
>
> The javacore stack shows numerous threads scanning jar files:
>
> 3XMTHREADINFO      "[ACTIVE] ExecuteThread: '2' for queue:
> 'weblogic.kernel.Default (self-tuning)'" (TID:0x3700E400,
> sys_thread_t:0x3393D030, state:B, native ID:0x009AB0B3) prio=5
> 4XESTACKTRACE          at
> java/util/zip/ZipFile.getEntry(ZipFile.java:287(Compiled Code))
> 4XESTACKTRACE          at
> java/util/jar/JarFile.getEntry(JarFile.java:283(Compiled Code))
> 4XESTACKTRACE          at
> java/util/jar/JarFile.getJarEntry(JarFile.java:266(Compiled Code))
> 4XESTACKTRACE          at
> sun/misc/URLClassPath$JarLoader.getResource(URLClassPath.java:949(Compiled
> Code))
> 4XESTACKTRACE          at
> sun/misc/URLClassPath$JarLoader.findResource(URLClassPath.java:938(Compiled
> Code))
> 4XESTACKTRACE          at
> sun/misc/URLClassPath.findResource(URLClassPath.java:299(Compiled
> Code))
> 4XESTACKTRACE          at
> java/net/URLClassLoader$3.run(URLClassLoader.java:784(Compiled Code))
> 4XESTACKTRACE          at
> java/security/AccessController.doPrivileged(AccessController.java:219)
> 4XESTACKTRACE          at
> java/net/URLClassLoader.findResource(URLClassLoader.java:781(Compiled
> Code))
> 4XESTACKTRACE          at
> java/lang/ClassLoader.getResource(ClassLoader.java:420(Compiled Code))
> 4XESTACKTRACE          at
> java/lang/ClassLoader.getResource(ClassLoader.java:415(Compiled Code))
> 4XESTACKTRACE          at
> java/lang/ClassLoader.getResource(ClassLoader.java:415(Compiled Code))
> 4XESTACKTRACE          at
> weblogic/utils/classloaders/GenericClassLoader.getResourceInternal(GenericClassLoader.java:170(Compiled
> Code))
> 4XESTACKTRACE          at
> weblogic/utils/classloaders/GenericClassLoader.getResource(GenericClassLoader.java:187(Compiled
> Code))
> 4XESTACKTRACE          at
> weblogic/utils/classloaders/FilteringClassLoader.getResourceInternal(FilteringClassLoader.java:89(Compiled
> Code))
> 4XESTACKTRACE          at
> weblogic/utils/classloaders/GenericClassLoader.getResourceInternal(GenericClassLoader.java:155(Compiled
> Code))
> 4XESTACKTRACE          at
> weblogic/utils/classloaders/GenericClassLoader.getResource(GenericClassLoader.java:187(Compiled
> Code))
> 4XESTACKTRACE          at
> java/lang/ClassLoader.getResource(ClassLoader.java:415(Compiled Code))
> 4XESTACKTRACE          at
> weblogic/utils/classloaders/GenericClassLoader.getResource(GenericClassLoader.java:190(Compiled
> Code))
> 4XESTACKTRACE          at
> weblogic/utils/classloaders/ChangeAwareClassLoader.getResource(ChangeAwareClassLoader.java:118(Compiled
> Code))
> 4XESTACKTRACE          at
> org/apache/tapestry5/ioc/internal/util/ClasspathResource.toURL(ClasspathResource.java:59(Compiled
> Code))
> 4XESTACKTRACE          at
> org/apache/tapestry5/ioc/internal/util/AbstractResource.exists(AbstractResource.java:137(Compiled
> Code))
> 4XESTACKTRACE          at
> org/apache/tapestry5/ioc/internal/util/AbstractResource.forLocale(AbstractResource.java:100(Compiled
> Code))
> 4XESTACKTRACE          at
> org/apache/tapestry5/internal/services/AssetSourceImpl.findRelativeAsset(AssetSourceImpl.java:99(Compiled
> Code))
> 4XESTACKTRACE          at
> org/apache/tapestry5/internal/services/AssetSourceImpl.getAsset(AssetSourceImpl.java:93(Compiled
> Code))
> 4XESTACKTRACE          at
> $AssetSource_124955c0e4c.getAsset($AssetSource_124955c0e4c.java(Compiled
> Code))
> 4XESTACKTRACE          at
> org/apache/tapestry5/internal/transform/AbstractIncludeAssetWorker$1.perform(AbstractIncludeAssetWorker.java:79(Compiled
> Code))
> 4XESTACKTRACE          at
> fr/poleemploi/d2i/tapestry/navigation/unifiee/components/Bandeau.setupRender(Bandeau.java(Compiled
> Code))
>
> The stack comes from weblogic/aix run but the problem is the same on
> other platforms as well.
>
> Does anyone has ever experienced such problems ?
>
> The performance penalty seems to be located in the
> AbstractResource.forLocale() method, especially the potential.exists()
> call. This part of code haven't evolved with the 5.1.x version.
>
> Does anybody have any idea on how to get around this problem ?
>
> Thanks in advance
>
> --
> ChristianZen
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@...
> For additional commands, e-mail: users-help@...
>

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Re: T5: ClasspathResource and performance

by cordenier christophe :: Rate this Message:

Reply to Author | View Threaded | Show Only this Message

Hello

i have already encounter this kind of problem, we solved it by using a
decorator to cache asset access with something like, it was for Tapestry
5.0.18 :

public class AssetSourceCacheDecorator implements AssetSource {

private final Map<MultiKey, *Asset*> cache =
CollectionFactory.newConcurrentMap();

private final AssetSource delegate;

public AssetSourceCacheDecorator(AssetSource delegate) { this.delegate =
delegate; }

public *Asset* getAsset(Resource baseResource, String path, Locale locale) {


MultiKey key = new MultiKey(path, locale); if (cache.get(key) == null) { *
Asset* *asset* = delegate.getAsset(baseResource, path, locale);
cache.put(key, *asset*); return *asset*; }

return cache.get(key); }

public *Asset* getClasspathAsset(String path) { return
this.getClasspathAsset(path, null); }

public *Asset* getClasspathAsset(String path, Locale locale) { return
this.getAsset(null, path, locale); }

}


Regards,

Christophe.


2009/10/29 Christiansen Merel <c.merel@...>

> Hello out there,
>
> We're running a quite busy website with tapestry 5.0.18 and we're
> hitting a performance problem with the ClasspathResource class.
>
> We're using classpath asset and none of them is localised. For each
> hit on a page using a classpath asset, we end having 2 missed queries
> on the ClassLoader for potential localized version of the asset. It
> does not really slow down the application throughput but we end with
> an __huge__ CPU consumption.
>
> The javacore stack shows numerous threads scanning jar files:
>
> 3XMTHREADINFO      "[ACTIVE] ExecuteThread: '2' for queue:
> 'weblogic.kernel.Default (self-tuning)'" (TID:0x3700E400,
> sys_thread_t:0x3393D030, state:B, native ID:0x009AB0B3) prio=5
> 4XESTACKTRACE          at
> java/util/zip/ZipFile.getEntry(ZipFile.java:287(Compiled Code))
> 4XESTACKTRACE          at
> java/util/jar/JarFile.getEntry(JarFile.java:283(Compiled Code))
> 4XESTACKTRACE          at
> java/util/jar/JarFile.getJarEntry(JarFile.java:266(Compiled Code))
> 4XESTACKTRACE          at
> sun/misc/URLClassPath$JarLoader.getResource(URLClassPath.java:949(Compiled
> Code))
> 4XESTACKTRACE          at
> sun/misc/URLClassPath$JarLoader.findResource(URLClassPath.java:938(Compiled
> Code))
> 4XESTACKTRACE          at
> sun/misc/URLClassPath.findResource(URLClassPath.java:299(Compiled
> Code))
> 4XESTACKTRACE          at
> java/net/URLClassLoader$3.run(URLClassLoader.java:784(Compiled Code))
> 4XESTACKTRACE          at
> java/security/AccessController.doPrivileged(AccessController.java:219)
> 4XESTACKTRACE          at
> java/net/URLClassLoader.findResource(URLClassLoader.java:781(Compiled
> Code))
> 4XESTACKTRACE          at
> java/lang/ClassLoader.getResource(ClassLoader.java:420(Compiled Code))
> 4XESTACKTRACE          at
> java/lang/ClassLoader.getResource(ClassLoader.java:415(Compiled Code))
> 4XESTACKTRACE          at
> java/lang/ClassLoader.getResource(ClassLoader.java:415(Compiled Code))
> 4XESTACKTRACE          at
>
> weblogic/utils/classloaders/GenericClassLoader.getResourceInternal(GenericClassLoader.java:170(Compiled
> Code))
> 4XESTACKTRACE          at
>
> weblogic/utils/classloaders/GenericClassLoader.getResource(GenericClassLoader.java:187(Compiled
> Code))
> 4XESTACKTRACE          at
>
> weblogic/utils/classloaders/FilteringClassLoader.getResourceInternal(FilteringClassLoader.java:89(Compiled
> Code))
> 4XESTACKTRACE          at
>
> weblogic/utils/classloaders/GenericClassLoader.getResourceInternal(GenericClassLoader.java:155(Compiled
> Code))
> 4XESTACKTRACE          at
>
> weblogic/utils/classloaders/GenericClassLoader.getResource(GenericClassLoader.java:187(Compiled
> Code))
> 4XESTACKTRACE          at
> java/lang/ClassLoader.getResource(ClassLoader.java:415(Compiled Code))
> 4XESTACKTRACE          at
>
> weblogic/utils/classloaders/GenericClassLoader.getResource(GenericClassLoader.java:190(Compiled
> Code))
> 4XESTACKTRACE          at
>
> weblogic/utils/classloaders/ChangeAwareClassLoader.getResource(ChangeAwareClassLoader.java:118(Compiled
> Code))
> 4XESTACKTRACE          at
>
> org/apache/tapestry5/ioc/internal/util/ClasspathResource.toURL(ClasspathResource.java:59(Compiled
> Code))
> 4XESTACKTRACE          at
>
> org/apache/tapestry5/ioc/internal/util/AbstractResource.exists(AbstractResource.java:137(Compiled
> Code))
> 4XESTACKTRACE          at
>
> org/apache/tapestry5/ioc/internal/util/AbstractResource.forLocale(AbstractResource.java:100(Compiled
> Code))
> 4XESTACKTRACE          at
>
> org/apache/tapestry5/internal/services/AssetSourceImpl.findRelativeAsset(AssetSourceImpl.java:99(Compiled
> Code))
> 4XESTACKTRACE          at
>
> org/apache/tapestry5/internal/services/AssetSourceImpl.getAsset(AssetSourceImpl.java:93(Compiled
> Code))
> 4XESTACKTRACE          at
> $AssetSource_124955c0e4c.getAsset($AssetSource_124955c0e4c.java(Compiled
> Code))
> 4XESTACKTRACE          at
>
> org/apache/tapestry5/internal/transform/AbstractIncludeAssetWorker$1.perform(AbstractIncludeAssetWorker.java:79(Compiled
> Code))
> 4XESTACKTRACE          at
>
> fr/poleemploi/d2i/tapestry/navigation/unifiee/components/Bandeau.setupRender(Bandeau.java(Compiled
> Code))
>
> The stack comes from weblogic/aix run but the problem is the same on
> other platforms as well.
>
> Does anyone has ever experienced such problems ?
>
> The performance penalty seems to be located in the
> AbstractResource.forLocale() method, especially the potential.exists()
> call. This part of code haven't evolved with the 5.1.x version.
>
> Does anybody have any idea on how to get around this problem ?
>
> Thanks in advance
>
> --
> ChristianZen
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@...
> For additional commands, e-mail: users-help@...
>
>

Re: T5: ClasspathResource and performance

by Carl Crowder :: Rate this Message:

Reply to Author | View Threaded | Show Only this Message

Also on there is the "tapestry.file-check-interval" which specifies how
long Tapestry should wait before rechecking for changes. In production,
I set that to "1y" because the files aren't going to change. However I
don't know if this affects asset loading or not, but I *think* that once
the first hit returns null it won't keep checking? It's worth a try and
it certainly won't harm.

Ulrich Stärk wrote:

> Doesn't limiting the supported locales to just the ones you support help?
>
> http://tapestry.apache.org/tapestry5.0/guide/conf.html
>
> Uli
>
> Am 29.10.2009 19:39 schrieb Christiansen Merel:
>> Hello out there,
>>
>> We're running a quite busy website with tapestry 5.0.18 and we're
>> hitting a performance problem with the ClasspathResource class.
>>
>> We're using classpath asset and none of them is localised. For each
>> hit on a page using a classpath asset, we end having 2 missed queries
>> on the ClassLoader for potential localized version of the asset. It
>> does not really slow down the application throughput but we end with
>> an __huge__ CPU consumption.
>>
>> The javacore stack shows numerous threads scanning jar files:
>>
>> 3XMTHREADINFO      "[ACTIVE] ExecuteThread: '2' for queue:
>> 'weblogic.kernel.Default (self-tuning)'" (TID:0x3700E400,
>> sys_thread_t:0x3393D030, state:B, native ID:0x009AB0B3) prio=5
>> 4XESTACKTRACE          at
>> java/util/zip/ZipFile.getEntry(ZipFile.java:287(Compiled Code))
>> 4XESTACKTRACE          at
>> java/util/jar/JarFile.getEntry(JarFile.java:283(Compiled Code))
>> 4XESTACKTRACE          at
>> java/util/jar/JarFile.getJarEntry(JarFile.java:266(Compiled Code))
>> 4XESTACKTRACE          at
>> sun/misc/URLClassPath$JarLoader.getResource(URLClassPath.java:949(Compiled
>>
>> Code))
>> 4XESTACKTRACE          at
>> sun/misc/URLClassPath$JarLoader.findResource(URLClassPath.java:938(Compiled
>>
>> Code))
>> 4XESTACKTRACE          at
>> sun/misc/URLClassPath.findResource(URLClassPath.java:299(Compiled
>> Code))
>> 4XESTACKTRACE          at
>> java/net/URLClassLoader$3.run(URLClassLoader.java:784(Compiled Code))
>> 4XESTACKTRACE          at
>> java/security/AccessController.doPrivileged(AccessController.java:219)
>> 4XESTACKTRACE          at
>> java/net/URLClassLoader.findResource(URLClassLoader.java:781(Compiled
>> Code))
>> 4XESTACKTRACE          at
>> java/lang/ClassLoader.getResource(ClassLoader.java:420(Compiled Code))
>> 4XESTACKTRACE          at
>> java/lang/ClassLoader.getResource(ClassLoader.java:415(Compiled Code))
>> 4XESTACKTRACE          at
>> java/lang/ClassLoader.getResource(ClassLoader.java:415(Compiled Code))
>> 4XESTACKTRACE          at
>> weblogic/utils/classloaders/GenericClassLoader.getResourceInternal(GenericClassLoader.java:170(Compiled
>>
>> Code))
>> 4XESTACKTRACE          at
>> weblogic/utils/classloaders/GenericClassLoader.getResource(GenericClassLoader.java:187(Compiled
>>
>> Code))
>> 4XESTACKTRACE          at
>> weblogic/utils/classloaders/FilteringClassLoader.getResourceInternal(FilteringClassLoader.java:89(Compiled
>>
>> Code))
>> 4XESTACKTRACE          at
>> weblogic/utils/classloaders/GenericClassLoader.getResourceInternal(GenericClassLoader.java:155(Compiled
>>
>> Code))
>> 4XESTACKTRACE          at
>> weblogic/utils/classloaders/GenericClassLoader.getResource(GenericClassLoader.java:187(Compiled
>>
>> Code))
>> 4XESTACKTRACE          at
>> java/lang/ClassLoader.getResource(ClassLoader.java:415(Compiled Code))
>> 4XESTACKTRACE          at
>> weblogic/utils/classloaders/GenericClassLoader.getResource(GenericClassLoader.java:190(Compiled
>>
>> Code))
>> 4XESTACKTRACE          at
>> weblogic/utils/classloaders/ChangeAwareClassLoader.getResource(ChangeAwareClassLoader.java:118(Compiled
>>
>> Code))
>> 4XESTACKTRACE          at
>> org/apache/tapestry5/ioc/internal/util/ClasspathResource.toURL(ClasspathResource.java:59(Compiled
>>
>> Code))
>> 4XESTACKTRACE          at
>> org/apache/tapestry5/ioc/internal/util/AbstractResource.exists(AbstractResource.java:137(Compiled
>>
>> Code))
>> 4XESTACKTRACE          at
>> org/apache/tapestry5/ioc/internal/util/AbstractResource.forLocale(AbstractResource.java:100(Compiled
>>
>> Code))
>> 4XESTACKTRACE          at
>> org/apache/tapestry5/internal/services/AssetSourceImpl.findRelativeAsset(AssetSourceImpl.java:99(Compiled
>>
>> Code))
>> 4XESTACKTRACE          at
>> org/apache/tapestry5/internal/services/AssetSourceImpl.getAsset(AssetSourceImpl.java:93(Compiled
>>
>> Code))
>> 4XESTACKTRACE          at
>> $AssetSource_124955c0e4c.getAsset($AssetSource_124955c0e4c.java(Compiled
>> Code))
>> 4XESTACKTRACE          at
>> org/apache/tapestry5/internal/transform/AbstractIncludeAssetWorker$1.perform(AbstractIncludeAssetWorker.java:79(Compiled
>>
>> Code))
>> 4XESTACKTRACE          at
>> fr/poleemploi/d2i/tapestry/navigation/unifiee/components/Bandeau.setupRender(Bandeau.java(Compiled
>>
>> Code))
>>
>> The stack comes from weblogic/aix run but the problem is the same on
>> other platforms as well.
>>
>> Does anyone has ever experienced such problems ?
>>
>> The performance penalty seems to be located in the
>> AbstractResource.forLocale() method, especially the potential.exists()
>> call. This part of code haven't evolved with the 5.1.x version.
>>
>> Does anybody have any idea on how to get around this problem ?
>>
>> Thanks in advance
>>
>> --
>> ChristianZen
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@...
>> For additional commands, e-mail: users-help@...
>>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@...
> For additional commands, e-mail: users-help@...
>

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Re: T5: ClasspathResource and performance

by Christiansen Merel-2 :: Rate this Message:

Reply to Author | View Threaded | Show Only this Message

Hi all,

Thanks for your answers.

I've already stripped down the supported locale list to the only one
needed. We still have two missed hit for each tried locale.

The tapestry.file-check-interval doesn't help either. The
file-check-interval is seems to be used only for existing files.

I guess the decorator will do the trick. Thanks.

Cheers,

--
ChristianZen

2009/10/29 Ulrich Stärk <uli@...>:

> Doesn't limiting the supported locales to just the ones you support help?
>
> http://tapestry.apache.org/tapestry5.0/guide/conf.html
>
> Uli
>
> Am 29.10.2009 19:39 schrieb Christiansen Merel:
>>
>> Hello out there,
>>
>> We're running a quite busy website with tapestry 5.0.18 and we're
>> hitting a performance problem with the ClasspathResource class.
>>
>> We're using classpath asset and none of them is localised. For each
>> hit on a page using a classpath asset, we end having 2 missed queries
>> on the ClassLoader for potential localized version of the asset. It
>> does not really slow down the application throughput but we end with
>> an __huge__ CPU consumption.
>>
>> The javacore stack shows numerous threads scanning jar files:
>>
>> 3XMTHREADINFO      "[ACTIVE] ExecuteThread: '2' for queue:
>> 'weblogic.kernel.Default (self-tuning)'" (TID:0x3700E400,
>> sys_thread_t:0x3393D030, state:B, native ID:0x009AB0B3) prio=5
>> 4XESTACKTRACE          at
>> java/util/zip/ZipFile.getEntry(ZipFile.java:287(Compiled Code))
>> 4XESTACKTRACE          at
>> java/util/jar/JarFile.getEntry(JarFile.java:283(Compiled Code))
>> 4XESTACKTRACE          at
>> java/util/jar/JarFile.getJarEntry(JarFile.java:266(Compiled Code))
>> 4XESTACKTRACE          at
>> sun/misc/URLClassPath$JarLoader.getResource(URLClassPath.java:949(Compiled
>> Code))
>> 4XESTACKTRACE          at
>>
>> sun/misc/URLClassPath$JarLoader.findResource(URLClassPath.java:938(Compiled
>> Code))
>> 4XESTACKTRACE          at
>> sun/misc/URLClassPath.findResource(URLClassPath.java:299(Compiled
>> Code))
>> 4XESTACKTRACE          at
>> java/net/URLClassLoader$3.run(URLClassLoader.java:784(Compiled Code))
>> 4XESTACKTRACE          at
>> java/security/AccessController.doPrivileged(AccessController.java:219)
>> 4XESTACKTRACE          at
>> java/net/URLClassLoader.findResource(URLClassLoader.java:781(Compiled
>> Code))
>> 4XESTACKTRACE          at
>> java/lang/ClassLoader.getResource(ClassLoader.java:420(Compiled Code))
>> 4XESTACKTRACE          at
>> java/lang/ClassLoader.getResource(ClassLoader.java:415(Compiled Code))
>> 4XESTACKTRACE          at
>> java/lang/ClassLoader.getResource(ClassLoader.java:415(Compiled Code))
>> 4XESTACKTRACE          at
>>
>> weblogic/utils/classloaders/GenericClassLoader.getResourceInternal(GenericClassLoader.java:170(Compiled
>> Code))
>> 4XESTACKTRACE          at
>>
>> weblogic/utils/classloaders/GenericClassLoader.getResource(GenericClassLoader.java:187(Compiled
>> Code))
>> 4XESTACKTRACE          at
>>
>> weblogic/utils/classloaders/FilteringClassLoader.getResourceInternal(FilteringClassLoader.java:89(Compiled
>> Code))
>> 4XESTACKTRACE          at
>>
>> weblogic/utils/classloaders/GenericClassLoader.getResourceInternal(GenericClassLoader.java:155(Compiled
>> Code))
>> 4XESTACKTRACE          at
>>
>> weblogic/utils/classloaders/GenericClassLoader.getResource(GenericClassLoader.java:187(Compiled
>> Code))
>> 4XESTACKTRACE          at
>> java/lang/ClassLoader.getResource(ClassLoader.java:415(Compiled Code))
>> 4XESTACKTRACE          at
>>
>> weblogic/utils/classloaders/GenericClassLoader.getResource(GenericClassLoader.java:190(Compiled
>> Code))
>> 4XESTACKTRACE          at
>>
>> weblogic/utils/classloaders/ChangeAwareClassLoader.getResource(ChangeAwareClassLoader.java:118(Compiled
>> Code))
>> 4XESTACKTRACE          at
>>
>> org/apache/tapestry5/ioc/internal/util/ClasspathResource.toURL(ClasspathResource.java:59(Compiled
>> Code))
>> 4XESTACKTRACE          at
>>
>> org/apache/tapestry5/ioc/internal/util/AbstractResource.exists(AbstractResource.java:137(Compiled
>> Code))
>> 4XESTACKTRACE          at
>>
>> org/apache/tapestry5/ioc/internal/util/AbstractResource.forLocale(AbstractResource.java:100(Compiled
>> Code))
>> 4XESTACKTRACE          at
>>
>> org/apache/tapestry5/internal/services/AssetSourceImpl.findRelativeAsset(AssetSourceImpl.java:99(Compiled
>> Code))
>> 4XESTACKTRACE          at
>>
>> org/apache/tapestry5/internal/services/AssetSourceImpl.getAsset(AssetSourceImpl.java:93(Compiled
>> Code))
>> 4XESTACKTRACE          at
>> $AssetSource_124955c0e4c.getAsset($AssetSource_124955c0e4c.java(Compiled
>> Code))
>> 4XESTACKTRACE          at
>>
>> org/apache/tapestry5/internal/transform/AbstractIncludeAssetWorker$1.perform(AbstractIncludeAssetWorker.java:79(Compiled
>> Code))
>> 4XESTACKTRACE          at
>>
>> fr/poleemploi/d2i/tapestry/navigation/unifiee/components/Bandeau.setupRender(Bandeau.java(Compiled
>> Code))
>>
>> The stack comes from weblogic/aix run but the problem is the same on
>> other platforms as well.
>>
>> Does anyone has ever experienced such problems ?
>>
>> The performance penalty seems to be located in the
>> AbstractResource.forLocale() method, especially the potential.exists()
>> call. This part of code haven't evolved with the 5.1.x version.
>>
>> Does anybody have any idea on how to get around this problem ?
>>
>> Thanks in advance
>>
>> --
>> ChristianZen
>>
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ChristianZen

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