Multitheaded app slower using libmtmalloc library

Hi everyone.
I am running a Java app (1.6.0_21) application on Solaris 5.10 (amd64):
% uname -a
SunOS frecrdqa 5.10 Generic_144489-17 i86pc i386 i86pc
ex16067@frecrdqa:/home/ex16067 {106}
% isainfo -v
64-bit amd64 applications
aes sse4.2 ssse3 popcnt tscp cx16 sse2 sse fxsr mmx cmov amd_sysc cx8
tsc fpu 0x800000
32-bit i386 applications
aes sse4.2 ssse3 popcnt tscp cx16 sse2 sse fxsr mmx cmov sep cx8 tsc
fpu 0x800000
It is a multithreaded app and I am trying to improve performance of memory allocation using libmtmalloc,
by setting LD_PRELOAD=/usr/lib/libmtmalloc.so
However, the application runs a 50% slower when using libmtmalloc, and I see nothing obvious for this.
Any idea on what could I investigate to know why libmtmalloc makes my app go slower?
Many thanks,
Angel

Probably because the JVM your Java code is running under already manages multithreaded memory allocation quite well.
By adding in libmtmalloc you made that management double-layered.
Don't guess. Use a profiler that shows where your app is spending all its time.

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Date/Time:       2012-04-09 12:46:07 -0400
OS Version:      10.7.3 (Build 11D50d)
Architecture:    x86_64
Report Version: 9
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