Re: [Wrapper-user] passing LD_PRELOAD or LD_PRELOAD_64 to jvm

[Christian <chr...@ta...>]

Hi,

Usually the jvm inherits the whole environment from the wrapper. so when
you started the wrapper preloading libumem both, the wrapper as well as
the JVM, will use libumem.

I assume you want to preload your JVM exclusively libumem.

That would be possible using the environment definition routines of the
wrapper; please have a look at this site:
http://wrapper.tanukisoftware.org/doc/english/props-envvars.html#definition

adding the following line should cause your JVM being generated using
libumem rather than the standard library for memory allocation:

set.LD_PRELOAD=/usr/lib/libumem.so

additionally you can also set the value for LD_PRELOAD_64 at the same
place to preload the 64bit libumem.


pldd 623
623:    /export/home/chris/340/wrapper_prerelease_3.4.0-pro/bin/./wrapper /exp
/usr/lib/libsocket.so.1
/usr/lib/libpthread.so.1
/usr/lib/libnsl.so.1
/usr/lib/libm.so.1
/usr/lib/librt.so.1
/usr/lib/libc.so.1
/usr/lib/libdl.so.1
/usr/lib/libmp.so.2
/usr/lib/libaio.so.1
/usr/lib/libmd5.so.1
/usr/lib/libthread.so.1

pldd 624
624:    /usr/jdk/jdk1.6.0_14/bin/java -Djava.library.path=../lib
-classpath ..
/usr/lib/libumem.so.1
/usr/lib/libthread.so.1
/usr/jdk/jdk1.6.0_14/jre/lib/i386/jli/libjli.so
/usr/lib/libdl.so.1
/usr/lib/libc.so.1
/usr/jdk/jdk1.6.0_14/jre/lib/i386/client/libjvm.so
/usr/lib/libsocket.so.1
/usr/lib/libsched.so.1
/usr/lib/libm.so.1
/usr/lib/libCrun.so.1
/usr/lib/libdoor.so.1
/usr/lib/libnsl.so.1
/usr/lib/libmp.so.2
/usr/jdk/jdk1.6.0_14/jre/lib/i386/libverify.so
/usr/jdk/jdk1.6.0_14/jre/lib/i386/libjava.so
/usr/jdk/jdk1.6.0_14/jre/lib/i386/native_threads/libhpi.so
/usr/jdk/jdk1.6.0_14/jre/lib/i386/libzip.so
/usr/jdk/jdk1.6.0_14/jre/lib/i386/libmanagement.so
/export/home/wrapper/lib/libwrapper.so
/usr/lib/librt.so.1
/usr/lib/libaio.so.1
/usr/lib/libmd5.so.1
/usr/jdk/jdk1.6.0_14/jre/lib/i386/libnet.so
/usr/jdk/jdk1.6.0_14/jre/lib/i386/libawt.so
/usr/jdk/jdk1.6.0_14/jre/lib/i386/headless/libmawt.so




Hope this is the answer to your question. 

Best Regards,
Christian


On Wed, 2010-04-21 at 23:55 +0300, Tomer B wrote:
> We’re in process to migrate our app to Solaris x86. Due to some memory
> allocation enhancements we would like to use libumem Solaris memory.
> To make it work JVM should have system environment LD_PRELOAD or
> LD_PRELOAD_64. The problem that if we use preload before wrapper
> launch it does not transfer the config further to  jvm. And it is not
> clear how to configure wrapper to make it work.
> 
> 
> Could you help please?
> 
> Thanks
> 
> 
> 
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