10-14-2008
As far as Hardware is concerned, I'm of the opinion that newer Opteron x86_64s will blow away Itanium servers. However, with Oracle -- and most non-CPU intensive tasks, the big problem is memory speed and latency. That's where it gets difficult to follow.
The early Opterons made a good move by putting the memory controller on the CPU itself. Although this was definitely superior, AMD was behind in moving their CPUs to support DDR2, wheras Intel had been doing that for years. Eventually, Intel moved the controller on the CPU (and the latest quad-core Itaniums do that) and AMD moved to support DDR2. I can tell you that DDR2 vs DDR1 is a pretty big difference. And benchmarks revealed that on-CPU memory controllers also made a big difference -- in certain applications.
Next we get to IO. Here, it matters little whether the chip is from Intel or AMD. Now it matters the quality of the chipset and hardware vendor. You need to have a very high FSB, and northbridge controllers. PCI-Express x16 and supporting cards should be preferred over PCI based controllers. Fiberchannel and Infiniband are preferred over SCSI, etc.
HP is supporting Linux with their HPC academic and blade-computing clusters. I don't know why you'd have to sacrifice HP support in order to get Linux. Could Linux outperform HP? Maybe not. Earlier, on this board, a poster demonstrated that HP-UX semaphore operations are 4x to 5x as fast as on Linux. Semaphores are pretty crucial when it comes to locking, and Oracle does that a lot. The only way to find out ... is to look for benchmarks that are similar to your environment.
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LEARN ABOUT OPENDARWIN
cpu_capabilities
cpu_capabilities(3alleg4) Allegro manual cpu_capabilities(3alleg4)
NAME
cpu_capabilities - Contains the capability flags of the CPU. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
extern int cpu_capabilities;
DESCRIPTION
Contains CPU flags indicating what features are available on the current CPU. The flags can be any combination of these:
CPU_ID - Indicates that the "cpuid" instruction is
available. If this is set, then all Allegro CPU
variables are 100% reliable, otherwise there
may be some mistakes.
CPU_FPU - An FPU is available.
CPU_IA64 - Running on Intel 64 bit CPU
CPU_AMD64 - Running on AMD 64 bit CPU
CPU_MMX - Intel MMX instruction set is available.
CPU_MMXPLUS - Intel MMX+ instruction set is available.
CPU_SSE - Intel SSE instruction set is available.
CPU_SSE2 - Intel SSE2 instruction set is available.
CPU_SSE3 - Intel SSE3 instruction set is available.
CPU_3DNOW - AMD 3DNow! instruction set is available.
CPU_ENH3DNOW - AMD Enhanced 3DNow! instruction set is
available.
CPU_CMOV - Pentium Pro "cmov" instruction is available.
You can check for multiple features by OR-ing the flags together. For example, to check if the CPU has an FPU and MMX instructions avail-
able, you'd do:
if ((cpu_capabilities & (CPU_FPU | CPU_MMX)) ==
(CPU_FPU | CPU_MMX)) {
printf("CPU has both an FPU and MMX instructions!
");
}
You can read this variable after you have called check_cpu() (which is automatically called by allegro_init()).
SEE ALSO
check_cpu(3alleg4), cpu_vendor(3alleg4), cpu_family(3alleg4), cpu_model(3alleg4), cpu_capabilities(3alleg4), allegro_init(3alleg4)
Allegro version 4.4.2 cpu_capabilities(3alleg4)