Typically such performance disparities are due to
changes in the memory footprint with the 64-bit code,
and resulting cache miss rates being higher with the
64-bit code than the 32-bit code.
You need to use the Studio tools to profile the code,
and/or cputrack to measure cache hit rates.
Thanks,
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 bette
