From owner-freebsd-java@FreeBSD.ORG Sun Feb 24 08:50:01 2013
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From: Uwe Dauernheim <uwe@dauernheim.net>
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Subject: java/176390: Upgrading openjdk6-b27 to openjdk6-b27_1 fails when
compiling corba/make/sun/rmi/corbalogcompile
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>Number: 176390
>Category: java
>Synopsis: Upgrading openjdk6-b27 to openjdk6-b27_1 fails when compiling corba/make/sun/rmi/corbalogcompile
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-java
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sun Feb 24 08:50:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator: Uwe Dauernheim
>Release: 9.1-release
>Organization:
>Environment:
FreeBSD ip-10-226-7-110 9.1-RELEASE FreeBSD 9.1-RELEASE #0: Thu Dec 13 20:04:15 UTC 2012 root@ip-10-58-178-174:/usr/obj/mnt/md/src/sys/XENHVM amd64
>Description:
When compiling openjdk6-b27_1 (upgrading from openjdk6-b27) the process terminates with the following error output:
gmake[8]: Entering directory `/usr/ports/java/openjdk6/work/corba/make/com/sun/corba/se/spi/logging'
gmake[8]: Leaving directory `/usr/ports/java/openjdk6/work/corba/make/com/sun/corba/se/spi/logging'
Timing: 00003 seconds or 3s for make-com-sun-corba-se-spi-logging
<<<Finished Recursively making logging build @ Sat Feb 23 22:23:49 UTC 2013.
>How-To-Repeat:
1. Run portmaster -a
or
1. Run the compilation process for this port
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
>>>Recursively making monitoring build @ Sat Feb 23 22:23:49 UTC 2013 ...
gmake[8]: Entering directory `/usr/ports/java/openjdk6/work/corba/make/com/sun/corba/se/spi/monitoring'
# Java sources to be compiled: (listed in file /usr/ports/java/openjdk6/work/build/bsd-amd64/corba/tmp/mo
nitoring/com.sun.corba.se.spi.monitoring/.classes.list)
./../../../../../../src/share/classes/com/sun/corba/se/spi/monitoring/StatisticsAccumulator.java
./../../../../../../src/share/classes/com/sun/corba/se/spi/monitoring/StatisticMonitoredAttribute.java
./../../../../../../src/share/classes/com/sun/corba/se/spi/monitoring/StringMonitoredAttributeBase.java
# Running javac:
/usr/local/openjdk6/bin/java -Xmx467m -Xms128m -Xbootclasspath/p:/usr/ports/java/openjdk6/work/build/bsd-
amd64/langtools/dist/bootstrap/lib/javac.jar -jar /usr/ports/java/openjdk6/work/build/bsd-amd64/langtools
/dist/bootstrap/lib/javac.jar -XDignore.symbol.file=true -source 1.5 -target 5 -encoding ascii -classpath
/usr/local/openjdk6/lib/tools.jar -Xprefer:source -sourcepath /usr/ports/java/openjdk6/work/build/bsd-am
d64/corba/gensrc:../../../../../../../src/solaris/classes:../../../../../../../src/share/classes -d /usr/
ports/java/openjdk6/work/build/bsd-amd64/corba/classes @/usr/ports/java/openjdk6/work/build/bsd-amd64/corba/tmp/monitoring/com.sun.corba.se.spi.monitoring/.classes.list
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
gmake[5]: *** [.compile.classlist] Killed: 9
gmake[5]: Leaving directory `/usr/ports/java/openjdk6/work/corba/make/sun/rmi/corbalogcompile'
gmake[4]: *** [build] Error 1
gmake[4]: Leaving directory `/usr/ports/java/openjdk6/work/corba/make/sun/rmi'
gmake[3]: *** [build] Error 1
gmake[3]: Leaving directory `/usr/ports/java/openjdk6/work/corba/make/sun'
gmake[2]: *** [build] Error 1
gmake[2]: Leaving directory `/usr/ports/java/openjdk6/work/corba/make'
gmake[1]: *** [corba-build] Error 2
gmake[1]: Leaving directory `/usr/ports/java/openjdk6/work'
gmake: *** [build_product_image] Error 2
*** [do-build] Error code 1
Stop in /usr/ports/java/openjdk6.
*** [build] Error code 1
Stop in /usr/ports/java/openjdk6.
===>>> make failed for java/openjdk6
===>>> Aborting update
===>>> Update for java/openjdk6 failed
===>>> Aborting update
Terminated
===>>> You can restart from the point of failure with this command line:
portmaster <flags> java/openjdk6
From owner-freebsd-java@FreeBSD.ORG Sun Feb 24 21:50:34 2013
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To: freebsd-java@freebsd.org, "Jurij Kovacic, OCPEA d.o.o."
<jurij.kovacic@ocpea.com>
Subject: Re: Java threads on multiple processor cores
References: <51283B84.5050709@ocpea.com>
Date: Sun, 24 Feb 2013 22:50:32 +0100
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On Sat, 23 Feb 2013 04:46:12 +0100, Jurij Kovacic, OCPEA d.o.o.
<jurij.kovacic@ocpea.com> wrote:
> Hi,
>
> I am running JBoss application server inside a jail on FreeBSD 8.3.
> Since the server has a quad-core processor, it would be efficient if the
> java process (and its threads) could utilize more than 1 CPU core at a
> time, which is not currently the case.
>
> Is it possible to acomplish this (perhaps with the use of a proper
> threading library) or am I barking up the wrong tree?
>
> Thank you for your reply,
> Jurij
I don't think there is a clear answer on this. It all depends on what is
running in your JBoss application server. If that application does not use
more than one thread, there is nothing going to use the other cores. If
your application uses multiple threads and you are sure they should all be
calculating very hard than you should debug the application for
bottlenecks. And look if the bottleneck is in the application code, in the
JDK or in FreeBSD. This is not possible without inside information of what
your application is doing.
Ronald.
From owner-freebsd-java@FreeBSD.ORG Mon Feb 25 08:18:43 2013
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From: Achilleas Mantzios <achill@matrix.gatewaynet.com>
To: freebsd-java@freebsd.org
Subject: Re: Java threads on multiple processor cores
Date: Mon, 25 Feb 2013 10:10:52 +0200
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Zdravo,
How are you sure your jboss does not utilize more than 1 processor?
did you check with top and then by enabling the thread view with "H"?
Have you tried the same with jboss run on the native installation?
On =C3=8E=C2=A3=C3=8E=C2=B1=C3=8E=C2=B2 23 =C3=8E=C2=A6=C3=8E=C2=B5=C3=8E=
=C2=B2 2013 04:46:12 Jurij Kovacic, OCPEA d.o.o. wrote:
> Hi,
>=20
> I am running JBoss application server inside a jail on FreeBSD 8.3.=20=
> Since the server has a quad-core processor, it would be efficient if =
the=20
> java process (and its threads) could utilize more than 1 CPU core at =
a=20
> time, which is not currently the case.
>=20
> Is it possible to acomplish this (perhaps with the use of a proper=20=
> threading library) or am I barking up the wrong tree?
>=20
> Thank you for your reply,
> Jurij
>=20
> _______________________________________________
> freebsd-java@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-java
> To unsubscribe, send any mail to "freebsd-java-unsubscribe@freebsd.or=
g"
-
Achilleas Mantzios
IT DEV
IT DEPT
Dynacom Tankers Mgmt
From owner-freebsd-java@FreeBSD.ORG Mon Feb 25 11:06:50 2013
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From: FreeBSD bugmaster <bugmaster@freebsd.org>
To: freebsd-java@FreeBSD.org
Subject: Current problem reports assigned to freebsd-java@FreeBSD.org
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Note: to view an individual PR, use:
http://www.freebsd.org/cgi/query-pr.cgi?pr=(number).
The following is a listing of current problems submitted by FreeBSD users.
These represent problem reports covering all versions including
experimental development code and obsolete releases.
S Tracker Resp. Description
--------------------------------------------------------------------------------
o ports/176390 java Upgrading openjdk6-b27 to openjdk6-b27_1 fails when co
o ports/175300 java java/jamvm fails to compile on ARM6 (raspberry-pi)
o ports/174826 java java/openjdk6: gmake[5]: *** [/usr/ports/java/openjdk6
o ports/174825 java java/openjdk6: fails to build on i386 (64-bit mode not
o java/173981 java Vuze and Java Errors
o ports/173603 java java/icedtea-web starts javaws incorrectly
o ports/173592 java java/openjdk6 fails on FreeBSD_9_1_RC2
o ports/173210 java java/openjdk6 - use better src placement
o java/172962 java Sig11 while compiling OpenJDK6-b26 using clang
o ports/171014 java [patch] Correct java/openjdk6 Dependency Declaration
o ports/167903 java [PATCH] java/openjdk6: Fix build failure in 8.3 jail r
o ports/164941 java [UPDATE] [NEW PORTS] java/classpath-initial, including
o ports/162991 java java/openjdk6 fails to build
o java/162522 java OpenJDK 6 is not setting close on exec
o java/160553 java Jaikoz java based audio tagger core dumps
o ports/159787 java java/openjdk6 nio muti-thread bug
o ports/154884 java java/openjdk6: Every NetBeans version on FreeBSD 8.1 c
f java/147512 java Crash of RXTX-2.1-7 on AMD64 system
o java/140002 java java/openjdk6: jconsole dumps tomcat when contacting j
o java/128809 java JVM aborted when GNU RXTX write to serial port.
o java/123555 java linux-sun-jdk15, linux-sun-jdk16 produce a coredump
o java/122513 java native JDKs unbuildable with Linux ones
o ports/119732 java java/linux-sun-jre16: linux-sun-jre16 plugin doesn't w
o java/119063 java An unexpected error has been detected by Java Runtime
o ports/116082 java java/linux-sun-jdk16 jconsole is unable to connect to
25 problems total.
From owner-freebsd-java@FreeBSD.ORG Mon Feb 25 12:40:02 2013
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Cc:
From: Uwe Dauernheim <uwe@dauernheim.net>
Subject: Re: ports/176390: Upgrading openjdk6-b27 to openjdk6-b27_1 fails when
compiling corba/make/sun/rmi/corbalogcompile
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The following reply was made to PR ports/176390; it has been noted by GNATS.
From: Uwe Dauernheim <uwe@dauernheim.net>
To: bug-followup@FreeBSD.org,
Uwe Dauernheim <uwe@dauernheim.net>
Cc:
Subject: Re: ports/176390: Upgrading openjdk6-b27 to openjdk6-b27_1 fails when compiling corba/make/sun/rmi/corbalogcompile
Date: Mon, 25 Feb 2013 13:33:07 +0100
The bug is non-deterministic. Thus I checked my memory usage and it =
turned out the compilation process quits because of no free ram.
I am sorry for submitting this as a bug.
/Uwe=
From owner-freebsd-java@FreeBSD.ORG Mon Feb 25 17:45:54 2013
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To: uwe@dauernheim.net, jkim@FreeBSD.org, freebsd-java@FreeBSD.org
From: jkim@FreeBSD.org
Subject: Re: ports/176390: Upgrading openjdk6-b27 to openjdk6-b27_1 fails when
compiling corba/make/sun/rmi/corbalogcompile
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Synopsis: Upgrading openjdk6-b27 to openjdk6-b27_1 fails when compiling corba/make/sun/rmi/corbalogcompile
State-Changed-From-To: open->closed
State-Changed-By: jkim
State-Changed-When: Mon Feb 25 17:45:17 UTC 2013
State-Changed-Why:
Closing per OP's request.
http://www.freebsd.org/cgi/query-pr.cgi?pr=176390
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Date: Wed, 27 Feb 2013 17:16:08 +0100
From: "Jurij Kovacic, OCPEA d.o.o." <jurij.kovacic@ocpea.com>
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To: Ronald Klop <ronald-freebsd8@klop.yi.org>
Subject: Re: Java threads on multiple processor cores
References: <51283B84.5050709@ocpea.com> <op.ws05mir88527sy@pinky>
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Hello!
On 02/24/2013 10:50 PM, Ronald Klop wrote:
> On Sat, 23 Feb 2013 04:46:12 +0100, Jurij Kovacic, OCPEA d.o.o.
> <jurij.kovacic@ocpea.com> wrote:
>
>> Hi,
>>
>> I am running JBoss application server inside a jail on FreeBSD 8.3.
>> Since the server has a quad-core processor, it would be efficient if
>> the java process (and its threads) could utilize more than 1 CPU core
>> at a time, which is not currently the case.
>>
>> Is it possible to acomplish this (perhaps with the use of a proper
>> threading library) or am I barking up the wrong tree?
>>
>> Thank you for your reply,
>> Jurij
>
> I don't think there is a clear answer on this. It all depends on what
> is running in your JBoss application server. If that application does
> not use more than one thread, there is nothing going to use the other
> cores. If your application uses multiple threads and you are sure they
> should all be calculating very hard than you should debug the
> application for bottlenecks. And look if the bottleneck is in the
> application code, in the JDK or in FreeBSD. This is not possible
> without inside information of what your application is doing.
First of all, thank you very much for your reply.
As it has turned out, I was not too precise in my earlier question -
after some testing I have found that after some intense page reloading,
full GC gets triggered. The thread running uses 100% of one core,while
all the other threads (presumably), have to wait for it to finish. Is
there any way to make full GC run in multiple threads?
Kind regards,
Jurij
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Date: Wed, 27 Feb 2013 17:16:18 +0100
From: "Jurij Kovacic, OCPEA d.o.o." <jurij.kovacic@ocpea.com>
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To: Achilleas Mantzios <achill@matrix.gatewaynet.com>
Subject: Re: Java threads on multiple processor cores
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Hello!
On 02/25/2013 09:10 AM, Achilleas Mantzios wrote:
> Zdravo,
>
> How are you sure your jboss does not utilize more than 1 processor?
> did you check with top and then by enabling the thread view with "H"?
> Have you tried the same with jboss run on the native installation?
(I was pleasantly surprised by your greeting - do you speak Slovenian by
any chance?)
I have tried the tings you suggested - top shows approx. 50% usage on a
dual processor machine and 25% on quad core.
What seems to happen is that the aplication triggers full GC, which
(seems?) to run on only one thread. My JVM settings pertaining to GC are
the following:
"... -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -verbose:gc
-XX:+PrintGCDetails". Is there a way to make full GC run on multiple
threads (and so, presumably on multiple processors)?
Thank you very much for your reply!
Kind regards,
Jurij
From owner-freebsd-java@FreeBSD.ORG Wed Feb 27 22:45:56 2013
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Subject: Does gcj work?
From: Guy Helmer <guy.helmer@gmail.com>
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I have been trying to get HelloWorld.java to work when compiled with gcj47
on both i386 and amd64. Seems like it should work. This code:
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello, World!");
}
}
compiled thus:
redwater:~ (515) gcj47 --main=HelloWorld -o HelloWorld HelloWorld.java
always croaks:
redwater:~ (516) ./HelloWorld
Abort (core dumped)
redwater:~ (517) gdb751 HelloWorld HelloWorld.core
...
(gdb) where
#0 0x2a4b573b in thr_kill () from /lib/libc.so.7
#1 0x2a42f986 in ?? () from /lib/libthr.so.3
#2 0x2a43005b in raise () from /lib/libthr.so.3
#3 0x2a55e04a in abort () from /lib/libc.so.7
#4 0x28b4b08f in _Jv_Throw (value=0xbfbfd894)
at ../.././../gcc-4.7-20130119/libjava/exception.cc:128
#5 0x28b892a8 in java::lang::Class::forName (className=0x844b9c0,
initialize=1 '\001', loader=0x0)
at ../.././../gcc-4.7-20130119/libjava/java/lang/natClass.cc:108
#6 0x28b9ac67 in java.lang.Class.forName(java.lang.String,
java.lang.Class)java.lang.Class (className=@844b9c0, caller=@29fb6c80)
at ../.././../gcc-4.7-20130119/libjava/java/lang/Class.java:133
#7 0x28fd457e in java.net.URLClassLoader.addURLImpl(java.net.URL)void (
this=this@entry=@845afa0, newUrl=newUrl@entry=@8449c80)
at
/usr/ports/lang/gcc47/work/gcc-4.7-20130119/libjava/classpath/java/net/URLClassLoader.java:332
#8 0x28fd4c83 in java.net.URLClassLoader.addURL(java.net.URL)void
(this=@845afa0,
newUrl=@8449c80)
at
/usr/ports/lang/gcc47/work/gcc-4.7-20130119/libjava/classpath/java/net/URLClassLoader.java:281
#9 0x28ba83e4 in gnu.gcj.runtime.SystemClassLoader.init()void
(this=@845afa0)
at
/usr/ports/lang/gcc47/work/gcc-4.7-20130119/libjava/gnu/gcj/runtime/SystemClassLoader.java:89
---Type <return> to continue, or q <return> to quit---
#10 0x28babed5 in gnu.gcj.runtime.ExtensionClassLoader.initialize()void ()
at
/usr/ports/lang/gcc47/work/gcc-4.7-20130119/libjava/gnu/gcj/runtime/ExtensionClassLoader.java:33
#11 0x28b3f600 in _Jv_CreateJavaVM (vm_args=vm_args@entry=0x0)
at ../.././../gcc-4.7-20130119/libjava/prims.cc:1670
#12 0x28b3fb38 in _Jv_RunMain (vm_args=0x0,
klass=klass@entry=0x8049240 <HelloWorld::class$>, name=name@entry=0x0,
argc=argc@entry=1, argv=argv@entry=0xbfbfdb98, is_jar=is_jar@entry
=false)
at ../.././../gcc-4.7-20130119/libjava/prims.cc:1720
#13 0x28b3fea2 in _Jv_RunMain (klass=klass@entry=0x8049240
<HelloWorld::class$>,
name=name@entry=0x0, argc=argc@entry=1, argv=argv@entry=0xbfbfdb98,
is_jar=is_jar@entry=false) at
../.././../gcc-4.7-20130119/libjava/prims.cc:1815
#14 0x28b3ff3b in JvRunMain (klass=0x8049240 <HelloWorld::class$>, argc=1,
argv=0xbfbfdb98) at ../.././../gcc-4.7-20130119/libjava/prims.cc:1821
#15 0x08048ad9 in main ()
Any ideas?
Thanks,
Guy
From owner-freebsd-java@FreeBSD.ORG Thu Feb 28 00:32:54 2013
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Date: Wed, 27 Feb 2013 19:30:53 -0500
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To: Guy Helmer <guy.helmer@gmail.com>
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On 2013-02-27 17:45:54 -0500, Guy Helmer wrote:
> I have been trying to get HelloWorld.java to work when compiled
> with gcj47 on both i386 and amd64. Seems like it should work. This
> code:
>
> public class HelloWorld { public static void main(String[] args) {
> System.out.println("Hello, World!"); } }
>
> compiled thus: redwater:~ (515) gcj47 --main=HelloWorld -o
> HelloWorld HelloWorld.java
>
> always croaks: redwater:~ (516) ./HelloWorld Abort (core dumped)
>
> redwater:~ (517) gdb751 HelloWorld HelloWorld.core ... (gdb) where
> #0 0x2a4b573b in thr_kill () from /lib/libc.so.7 #1 0x2a42f986 in
> ?? () from /lib/libthr.so.3 #2 0x2a43005b in raise () from
> /lib/libthr.so.3 #3 0x2a55e04a in abort () from /lib/libc.so.7 #4
> 0x28b4b08f in _Jv_Throw (value=0xbfbfd894) at
> ../.././../gcc-4.7-20130119/libjava/exception.cc:128 #5 0x28b892a8
> in java::lang::Class::forName (className=0x844b9c0, initialize=1
> '\001', loader=0x0) at
> ../.././../gcc-4.7-20130119/libjava/java/lang/natClass.cc:108 #6
> 0x28b9ac67 in java.lang.Class.forName(java.lang.String,
> java.lang.Class)java.lang.Class (className=@844b9c0,
> caller=@29fb6c80) at
> ../.././../gcc-4.7-20130119/libjava/java/lang/Class.java:133 #7
> 0x28fd457e in java.net.URLClassLoader.addURLImpl(java.net.URL)void
> ( this=this@entry=@845afa0, newUrl=newUrl@entry=@8449c80) at
> /usr/ports/lang/gcc47/work/gcc-4.7-20130119/libjava/classpath/java/net/URLClassLoader.java:332
>
>
#8 0x28fd4c83 in java.net.URLClassLoader.addURL(java.net.URL)void
> (this=@845afa0, newUrl=@8449c80) at
> /usr/ports/lang/gcc47/work/gcc-4.7-20130119/libjava/classpath/java/net/URLClassLoader.java:281
>
>
#9 0x28ba83e4 in gnu.gcj.runtime.SystemClassLoader.init()void
> (this=@845afa0) at
> /usr/ports/lang/gcc47/work/gcc-4.7-20130119/libjava/gnu/gcj/runtime/SystemClassLoader.java:89
>
>
- ---Type <return> to continue, or q <return> to quit---
> #10 0x28babed5 in
> gnu.gcj.runtime.ExtensionClassLoader.initialize()void () at
> /usr/ports/lang/gcc47/work/gcc-4.7-20130119/libjava/gnu/gcj/runtime/ExtensionClassLoader.java:33
>
>
#11 0x28b3f600 in _Jv_CreateJavaVM (vm_args=vm_args@entry=0x0)
> at ../.././../gcc-4.7-20130119/libjava/prims.cc:1670 #12 0x28b3fb38
> in _Jv_RunMain (vm_args=0x0, klass=klass@entry=0x8049240
> <HelloWorld::class$>, name=name@entry=0x0, argc=argc@entry=1,
> argv=argv@entry=0xbfbfdb98, is_jar=is_jar@entry =false) at
> ../.././../gcc-4.7-20130119/libjava/prims.cc:1720 #13 0x28b3fea2 in
> _Jv_RunMain (klass=klass@entry=0x8049240 <HelloWorld::class$>,
> name=name@entry=0x0, argc=argc@entry=1,
> argv=argv@entry=0xbfbfdb98, is_jar=is_jar@entry=false) at
> ../.././../gcc-4.7-20130119/libjava/prims.cc:1815 #14 0x28b3ff3b in
> JvRunMain (klass=0x8049240 <HelloWorld::class$>, argc=1,
> argv=0xbfbfdb98) at
> ../.././../gcc-4.7-20130119/libjava/prims.cc:1821 #15 0x08048ad9 in
> main ()
>
> Any ideas?
It works. You just missed a very important option:
% gcj48 --main=HelloWorld -o HelloWorld HelloWorld.java
Abort (core dumped)
% ./HelloWorld
% gcj48 --main=HelloWorld -Wl,-rpath=/usr/local/lib/gcc48 -o
HelloWorld HelloWorld.java
% ./HelloWorld
Hello, World!
As you can see, you had to add "-Wl,-rpath=/usr/local/lib/gcc48" (or
"-Wl,-rpath=/usr/local/lib/gcc47" in your case).
Jung-uk Kim
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From owner-freebsd-java@FreeBSD.ORG Thu Feb 28 08:53:58 2013
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To: "Jurij Kovacic, OCPEA d.o.o." <jurij.kovacic@ocpea.com>
Subject: Re: Java threads on multiple processor cores
References: <51283B84.5050709@ocpea.com> <op.ws05mir88527sy@pinky>
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On Wed, 27 Feb 2013 17:16:08 +0100, Jurij Kovacic, OCPEA d.o.o.
<jurij.kovacic@ocpea.com> wrote:
> Hello!
>
> On 02/24/2013 10:50 PM, Ronald Klop wrote:
>> On Sat, 23 Feb 2013 04:46:12 +0100, Jurij Kovacic, OCPEA d.o.o.
>> <jurij.kovacic@ocpea.com> wrote:
>>
>>> Hi,
>>>
>>> I am running JBoss application server inside a jail on FreeBSD 8.3.
>>> Since the server has a quad-core processor, it would be efficient if
>>> the java process (and its threads) could utilize more than 1 CPU core
>>> at a time, which is not currently the case.
>>>
>>> Is it possible to acomplish this (perhaps with the use of a proper
>>> threading library) or am I barking up the wrong tree?
>>>
>>> Thank you for your reply,
>>> Jurij
>>
>> I don't think there is a clear answer on this. It all depends on what
>> is running in your JBoss application server. If that application does
>> not use more than one thread, there is nothing going to use the other
>> cores. If your application uses multiple threads and you are sure they
>> should all be calculating very hard than you should debug the
>> application for bottlenecks. And look if the bottleneck is in the
>> application code, in the JDK or in FreeBSD. This is not possible
>> without inside information of what your application is doing.
> First of all, thank you very much for your reply.
>
> As it has turned out, I was not too precise in my earlier question -
> after some testing I have found that after some intense page reloading,
> full GC gets triggered. The thread running uses 100% of one core,while
> all the other threads (presumably), have to wait for it to finish. Is
> there any way to make full GC run in multiple threads?
>
> Kind regards,
> Jurij
I see in your other mail that you are familiar with choosing a GC on the
command line. My experience is to just let the jvm choose the best
settings unless you run a very special application and have a lot of
knowledge about the internals of the GC. The guys (and girls) working on
Java have done some pretty good work on this GCing.
What sounds more troublesome (and yes I'm a bit guessing here, because I
don't know your application) is that your application keeps doing GC for a
long time. That sounds like your JVM runs with not enough memory or you
have a memory leak somewhere.
While your application is running you can see statistics of GC with this
command.
jstat -gc -t -h10 <pid> 5s
FGC increases with every new full gc run. Does OU (Old Usage) decrease
after a FGC? If not the GC could not free any memory and it will keep
GC'ing very hard.
Ronald.