A question about GMPs performance on the Intel Core i3 & i5 processors
tg at gmplib.org
Mon Jun 28 11:40:08 CEST 2010
Will Galway <galway at math.uiuc.edu> writes:
I'm considering getting a new computer using, most likely, either an
Intel i3-530 processor (my preference) or an Intel i5-570 processor.
In terms of the performance of GMP, is there any particular reason I
should prefer the latter processor? (The i5-570 has 8MB of level-3
cache, vs the i3-530's 4MB, but I rarely use GMP for "large" operands,
rather I tend to work mostly with 128..256-bit operands.)
Thanks for any advice that readers might have.
The GMPbench reslts page at
might be useful reading.
A more technical page, https://gmplib.org/devel/asm.html might also
provide some insights.
AMD processors are the far fastest for GMP work currently, at least
until operands get really huge. Intel's newest processors have a better
memory subsystem (better prefetch, more bandwidth) so they catch AMD's
procssors when we perform the largest FFTs.
The main reason behind AMD's performance is the 64 x 64 -> 128 bit
multiply accumulation performance. AMD can approach one such operation
each 2.25th cycle; Intel core iX can approach one such operation each
I am not aware of any differences between core i3, i5, i7 wrt GMP
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