Hi,
I am surprised with the performances of some 64-bit multi-threaded applications
on my AMD Opteron machine. For most of the applications, the performance of
32-bit version is almost same as the performance of 64-bit version. However,
for a couple of applications, 32-bit versions provide better performance
(running-time is around 76 secs) than 64-bit (running time is around 96 secs).
Could anyone help me to find the reason behind this, please?
$ldd program-64 (64-bit version)
libpthread.so.1 => /lib/64/libpthread.so.1
libstdc++.so.6 => /usr/lib/64/libstdc++.so.6
libm.so.2 => /lib/64/libm.so.2
libgcc_s.so.1 => /usr/lib/64/libgcc_s.so.1
libc.so.1 => /lib/64/libc.so.1
$ ldd program-32 (32-bit version)
libpthread.so.1 => /lib/libpthread.so.1
libstdc++.so.6 => /usr/lib/libstdc++.so.6
libm.so.2 => /lib/libm.so.2
libgcc_s.so.1 => /usr/lib/libgcc_s.so.1
libc.so.1 => /lib/libc.so.1
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