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Date: Mon, 17 Aug 2015 21:57:54 +0300
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: Sybase-PROP (Re: FMT_OMP_BAD)
On Mon, Aug 17, 2015 at 09:06:48PM +0300, Solar Designer wrote:
> On Sun, Aug 16, 2015 at 07:56:22PM +0200, magnum wrote:
> > On 2015-08-16 19:30, Solar Designer wrote:
> > >I just noticed that one format in the below 4.0 range isn't actually
> > >that fast. So FAST_FORMATS_OMP wouldn't be appropriate for it.
> > >Instead, we need to figure out and correct whatever other scalability
> > >issue it has. It's this one:
> > >
> > >[solar@...er run]$ OMP_NUM_THREADS=1 ./john -test -form=Sybase-PROP
> > >Warning: OpenMP is disabled; a non-OpenMP build may be faster
> > >Benchmarking: Sybase-PROP [salted FEAL-8 32/64]... DONE
> > >Many salts: 382976 c/s real, 382976 c/s virtual
> > >Only one salt: 380928 c/s real, 380928 c/s virtual
> >
> > This is now https://github.com/magnumripper/JohnTheRipper/issues/1673
>
> I found the main problem with this one: it turned out to be use of
> static variables (thus, shared between the threads) in feal8_plug.c:
> Rot2(). I'll post a patch for this and more shortly.
I've attached the patch. There are many changes, but almost all of the
speedup comes from the replaced Rot2().
Non-OpenMP is only slightly faster than before:
[solar@...er run]$ ./john -test -form=sybase-prop
Benchmarking: Sybase-PROP [salted FEAL-8 32/64]... DONE
Many salts: 399104 c/s real, 399104 c/s virtual
Only one salt: 397312 c/s real, 397312 c/s virtual
but OpenMP scaling is now much better:
[solar@...er run]$ OMP_NUM_THREADS=1 ./john -test -form=sybase-prop
Warning: OpenMP is disabled; a non-OpenMP build may be faster
Benchmarking: Sybase-PROP [salted FEAL-8 32/64]... DONE
Many salts: 398464 c/s real, 398464 c/s virtual
Only one salt: 396672 c/s real, 396672 c/s virtual
[solar@...er run]$ OMP_NUM_THREADS=10 ./john -test -form=sybase-prop
Will run 10 OpenMP threads
Benchmarking: Sybase-PROP [salted FEAL-8 32/64]... (10xOMP) DONE
Many salts: 3543K c/s real, 352541 c/s virtual
Only one salt: 3345K c/s real, 335904 c/s virtual
[solar@...er run]$ OMP_NUM_THREADS=16 ./john -test -form=sybase-prop
Will run 16 OpenMP threads
Benchmarking: Sybase-PROP [salted FEAL-8 32/64]... (16xOMP) DONE
Many salts: 5275K c/s real, 329316 c/s virtual
Only one salt: 4915K c/s real, 306433 c/s virtual
[solar@...er run]$ GOMP_CPU_AFFINITY=0-31 ./john -test -form=sybase-prop
Will run 32 OpenMP threads
Benchmarking: Sybase-PROP [salted FEAL-8 32/64]... (32xOMP) DONE
Many salts: 7786K c/s real, 243628 c/s virtual
Only one salt: 6815K c/s real, 212726 c/s virtual
magnum, please apply this.
Alexander
View attachment "john-SybasePROP-opt.diff" of type "text/plain" (14272 bytes)
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