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Message-ID: <1fd798de05294cf0e0ab7369e740e3cc@smtp.hushmail.com>
Date: Thu, 25 Apr 2013 01:12:19 +0200
From: magnum <john.magnum@...hmail.com>
To: "john-dev@...ts.openwall.com" <john-dev@...ts.openwall.com>
Subject: ICC performance regression
Jim and I have independantly re-built new intrinsics .S files with latest icc (13.1.1) with BAD results. There are huge performance regressions.
We could try to find an older version (last files were built with 12.1.4), but even so, it seems gcc has gotten so much better, the incentives for maintaining the pre-built ones are gone now:
Old pre-built files, icc 12.1.4:
Benchmarking: Raw MD4 [128/128 SSE2 intrinsics 12x]... DONE
Raw: 41129K c/s real, 41129K c/s virtual
Benchmarking: Raw MD5 [128/128 SSE2 intrinsics 12x]... DONE
Raw: 31789K c/s real, 31789K c/s virtual
Benchmarking: Raw SHA-1 [128/128 SSE2 intrinsics 8x]... DONE
Raw: 15239K c/s real, 15239K c/s virtual
Benchmarking: FreeBSD MD5 [128/128 SSE2 intrinsics 12x]... DONE
Raw: 39204 c/s real, 39204 c/s virtual
New pre-built files, icc 13.1:
Benchmarking: Raw MD4 [128/128 SSE2 intrinsics 12x]... DONE
Raw: 28670K c/s real, 28670K c/s virtual
Benchmarking: Raw MD5 [128/128 SSE2 intrinsics 12x]... DONE
Raw: 20144K c/s real, 20144K c/s virtual
Benchmarking: Raw SHA-1 [128/128 SSE2 intrinsics 8x]... DONE
Raw: 14799K c/s real, 14799K c/s virtual
Benchmarking: crypt-MD5 [128/128 SSE2 intrinsics 12x]... DONE
Raw: 21996 c/s real, 21996 c/s virtual
gcc 4.7.2, plain -64 target:
Benchmarking: Raw MD4 [128/128 SSE2 intrinsics 12x]... DONE
Raw: 42395K c/s real, 42395K c/s virtual
Benchmarking: Raw MD5 [128/128 SSE2 intrinsics 12x]... DONE
Raw: 30036K c/s real, 30036K c/s virtual
Benchmarking: Raw SHA-1 [128/128 SSE2 intrinsics 4x]... DONE
Raw: 17231K c/s real, 17231K c/s virtual
Benchmarking: crypt-MD5 [128/128 SSE2 intrinsics 12x]... DONE
Raw: 35952 c/s real, 35952 c/s virtual
...not to mention that when not using the pre-built files, you can use a -native, -xop or -avx target and get even better results:
gcc 4.7.2, -native target:
Benchmarking: Raw MD4 [128/128 AVX intrinsics 12x]... DONE
Raw: 44632K c/s real, 44632K c/s virtual
Benchmarking: Raw MD5 [128/128 AVX intrinsics 12x]... DONE
Raw: 29950K c/s real, 29950K c/s virtual
Benchmarking: Raw SHA-1 [128/128 AVX intrinsics 4x]... DONE
Raw: 19419K c/s real, 19419K c/s virtual
Benchmarking: crypt-MD5 [128/128 AVX intrinsics 12x]... DONE
Raw: 36936 c/s real, 36936 c/s virtual
Personally, I think we should just drop the -i targets, but Jim will investigate some more.
magnum
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