Top of the morning to y¹all! I¹m a bit curious as to what optimization flags are in the newest compilers and how they¹d work with the newest CPU¹s versus the last generation of CPU¹s. Our older systems we Dell Precision T5400 workstations with dual Intel Xeon 5420 CPU¹s at 2.33GHz with 6MB of cache per core. The cache breaks out to be 32k of L1 cache and 6MB of L2 cache. Now, we¹re getting Dell Precision T5500 workstations with dual Intel Xeon 5506 CPU¹s at 2.21GHz with 4MB of cache per core. But, the cache breaks down as 32k L1 cache, 256k L2 cache and 4096k L3 cache. Out application is very processor and disk I/O intensive and it runs about 6x slower on the newer hardware versus the old. 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. Our compiler flags are: -g O2 funroll-loops finline-limit=2750 pipe ansi pedantic Wimplicit Wconversion Wsign-compare Wno-long-long Wreorder Woverloaded-virtual Wsign-promo march=pentium4 mfpmath=sse malign-double (Not necessarily in this order... But, is order important???) Thanks, -b --
