>>>>> On Fri, 24 Oct 2003 10:10:44 -0700, Stephane Eranian <eranian@hpl.hp.com> said: Stephane> Ionut, On Fri, Oct 24, 2003 at 06:26:55PM +0200, Ionut Stephane> Georgescu wrote: >> Yes, it is a 1.5MB cache CPU. >> But it might be more than just cache misses. When running with a >> 256x256 grid, I am actually using 3 256x257 matrices, which is >> slightly over 1.5MB. I just made a comparison with a 32x32 grid >> and the difference is the same: alpha 10.294s, zx2000 14.777s >> . -O3 is only by 0.4s faster than -O2 in this case. Stephane> Another thing to check is the syslog. Check to see if your Stephane> program is not getting "floating point software assist" Stephane> fault. That can slow you down significantly. Note that on Red Hat you'd have to raise the dmesg level above WARNING to see such messages (dmesg -n8 should do the trick). --david - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.htmlReceived on Fri Oct 24 14:40:48 2003
This archive was generated by hypermail 2.1.8 : 2005-08-02 09:20:19 EST