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Date: Sun, 12 Jan 2014 14:13:37 +0400 From: Solar Designer <solar@...nwall.com> To: discussions@...sword-hashing.net Subject: Re: [PHC] escrypt memory access speed (Re: [PHC] Reworked KDF available on github for feedback: NOELKDF) On Sun, Jan 12, 2014 at 01:14:53PM +0400, Solar Designer wrote: > Xeon Phi 5110P, using 2 GB, r=8 p=240, 240 threads, Salsa20/2, abusing > scalar units for computation (no SIMD code implemented yet), no > prefetches, 10 hash computations: > > real 0m 5.00s > user 17m 54.14s > sys 0m 18.27s > > 2*3*10*2^30/10^9/5.00 = 12.88 GB/s Tried running 3 instances in parallel, 80 threads for each, 6 GB total memory usage: [user@...er-mic0 user]$ cat>r OMP_NUM_THREADS=80 LD_LIBRARY_PATH=. time ./tests & OMP_NUM_THREADS=80 LD_LIBRARY_PATH=. time ./tests & OMP_NUM_THREADS=80 LD_LIBRARY_PATH=. time ./tests & [user@...er-mic0 user]$ . r [...] real 0m 20.85s user 8m 39.12s sys 0m 12.79s real 0m 20.85s user 8m 44.29s sys 0m 11.24s real 0m 20.85s user 8m 40.44s sys 0m 13.44s No luck - this is even slower: 2*3*10*3*2^30/10^9/20.85 = 9.27 GB/s Alexander
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