The kernel patch http://shimizu-lab.et.u-tokai.ac.jp/~nshimizu makes HPC applications faster. I ran some benchmark with pached kernel.
The benchmark results on EB164: - A 1000x1000 matrix transpose: 41% faster than the normal - 1000x1000 matrix to matrix multiply 22% faster than the normal (This is my code not the ATLAS nor CXML, they uses sub-block copy to reduce the translation misses and the effectiveness will be little [with CXML it was only 2% faster with my patch]) - 131072 point FFT 97% faster than the normal Fortran users should be care, this patch will not accelerate the performance for the "common" area. Because many fortran compilers set the protection information of the area as read_only at the initial allocation, and then at the access exception it will turn on the write_enable of the ONE page. It is difficult for OS to detect that the block of the pages can be turned on the flag. -------------- BTW, why 2.4.0-test? kernel crashes on the mount? Is there any solution on the mount problem? Naohiko Shimizu Dept. Communication Engr./Univ. TOKAI 1117 Kitakaname Hiratsuka 259-12 Japan TEL.+81-463-58-1211(ext. 4084) FAX.+81-463-58-8320
