Tim Prince wrote: > Brian McGrew wrote: >> We¹re currently compiling >> with gcc-4.1.1 using the following optimization flags on Fedora Core 5 using >> a 2.6.16.16 kernel. As it happens, the code runs seemlessly on CentOS 5.2 >> with a 2.6.18 kernel as well. Upgrading compilers, if there is a compelling >> reason is an option for us. Upgrading kernels, at this time is not an >> option because of 3rd party hardware support. >> > Basically, you seem to be saying that the old scheduler doesn't work well > for you, while the newer one is OK. That's not under the control of gcc. > You didn't say whether you set the NUMA option in BIOS. If you wish to > run with NUMA, so as to get the advantage of local memory access, and want > high level affinity control from gcc, you might upgrade to a gcc version > which supports libgomp, use OpenMP directives in the important code > sections, and set the GOMP_CPU_AFFINITY. Of course, if taskset isn't working for you on FC5, GOMP_CPU_AFFINITY may not work either.
