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Date: Wed, 14 Feb 2018 03:12:39 +0100
From: Lukas Odzioba <lukas.odzioba@...il.com>
To: john-dev@...ts.openwall.com
Subject: Profiling John
Hi all,
I tried to reproduce old charts from wiki:
http://openwall.info/wiki/john/development/GPU
But OpenCL seems to be no longer supported on nV Visual Profiler.
AMD have it's CodeXL profiler which is kind of useful, but I switched
to nV due to constant driver issues and don't want go back again.
As far as I know gprof's flat profile should be what I need (time
based sampling), but I don't quite trust what I see there:
ukasz@...ris ~/ $ ./john -test -format=md5crypt -length=8
Will run 8 OpenMP threads
Benchmarking: md5crypt, crypt(3) $1$ [MD5 128/128 AVX 12x]... (8xOMP) DONE
Raw: 111744 c/s real, 14703 c/s virtual
ukasz@...ris ~/ $ gprof john | head -n 12
Flat profile:
Each sample counts as 0.01 seconds.
% cumulative self self total
time seconds seconds calls s/call s/call name
81.20 2.03 2.03 5444891 0.00 0.00 SSEmd5body
16.00 2.43 0.40 5269 0.00 0.00 md5cryptsse
2.80 2.50 0.07 16077 0.00 0.00 cfg_get_section
0.00 2.50 0.00 33488 0.00 0.00 mem_alloc_tiny_func
0.00 2.50 0.00 21299 0.00 0.00 str_alloc_copy_func
0.00 2.50 0.00 15950 0.00 0.00 cfg_get_list
0.00 2.50 0.00 11343 0.00 0.00 trim
ukasz@...ris ~/ $ ./john -test -format=md5crypt-opencl -length=8
Device 0: GeForce GTX 1060 6GB
Local worksize (LWS) 64, global worksize (GWS) 32768
Benchmarking: md5crypt-opencl, crypt(3) $1$ [MD5 OpenCL]... DONE
Raw: 303407 c/s real, 303407 c/s virtual
ukasz@...ris ~/ $ gprof john | head -n 12
Flat profile:
Each sample counts as 0.01 seconds.
% cumulative self self total
time seconds seconds calls ms/call ms/call name
75.00 0.06 0.06 16086 0.00 0.00 cfg_get_section
12.50 0.07 0.01 100 0.10 0.10 cmp_all
12.50 0.08 0.01 1 10.00 19.02 fmt_self_test
0.00 0.08 0.00 326700 0.00 0.00 set_key
0.00 0.08 0.00 196511 0.00 0.00 longcand
0.00 0.08 0.00 33485 0.00 0.00 mem_alloc_tiny_func
0.00 0.08 0.00 32858 0.00 0.00 get_key
crypt_all should be somewhere at the top and it is reported as 0% of
the time, but call count is not zero.
To use gprof I modified Makefile after configure to have -pg in
LDFLAGS, CFLAGS and CFLAGSX (also removed -fommit-frame-pointer).
So far I had the most success with callgrind on the CPU side.
I am curious what do you guys use for John profling theese days (GPU
and CPU wise).
Thanks,
Lukas
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