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Old 2020-12-15, 01:07   #3
VBCurtis
 
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"Curtis"
Feb 2005
Riverside, CA

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GMP-ECM is quite kind to HT, yes. It's also rather kind to memory bandwidth, so it makes a nice hyperthread-partner to LLR or P95 work.
mprime's stage 1 ECM uses FFT arithmetic, similar to the LL test; so it's not as memory-kind. This is another reason that for workloads involving hyperthreads, it may be faster to run GMP-ECM rather than P95-ECM on these small mersenne composites.
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