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Date: Wed, 18 Sep 2013 16:42:32 -0400
From: Yaniv Sapir <yaniv@...pteva.com>
To: john-dev <john-dev@...ts.openwall.com>
Subject: Re: bcrypt-parallella on 64-core (was: Katja's weekly
 report #13)

(A very long shot:) In the stuck cores, do you have external loads into
registers R53, R0, R2, R38, respectively?



On Wed, Sep 18, 2013 at 2:16 PM, Katja Malvoni <kmalvoni@...il.com> wrote:

> Hi Yaniv,
>
> These are register values from cores which reads start flag correctly and
> reaches idle instruction:
>
> [0x000f0400] = 0x00080000
> [0x000f0404] = 0x00001000
> [0x000f0408] = 0x000007e8
> [0x000f040c] = 0x00000000
> [0x000f0410] = 0x00000000
> [0x000f0414] = 0x00000000
> [0x000f0418] = 0x00000000
> [0x000f041c] = 0x00000000
> [0x000f0420] = 0x00000858
> [0x000f0424] = 0x000003ff
> [0x000f0428] = 0x00000000
> [0x000f042c] = 0x00000000
> [0x000f0430] = 0x00000000
> [0x000f0434] = 0x00000000
> [0x000f0438] = 0x00000000
> [0x000f043c] = 0x00000000
> [0x000f0440] = 0x00000000
> [0x000f0444] = 0x00002600
> [0x000f0448] = 0x00000000
>
> But cores which don't read and update start flags have these values:
> core (3, 5) has zero on all addresses except [0x000f0444] = 0x00003500
> core (4, 6) has zero on all locations
> core (7, 4) has zero on all addresses except [0x000f0444] = 0x00000200
> core (7, 5) has zero on all addresses except [0x000f0444] = 0x00002600
>
> It seems that some cores don't start computation. So far it looks random,
> only regularity I see is that first two rows work (If I use only first two
> rows I get 1207 c/s).
>
> Katja
>



-- 
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Yaniv Sapir
Adapteva Inc.
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Phone: (781)-328-0513 (x104)
Email: yaniv@...pteva.com
Web: www.adapteva.com
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