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Message-ID: <CAFYn=yA7a5G1UfoDKxF32bTPo+6wRFP7-MUHwfoHnYLUgUJuJw@mail.gmail.com>
Date: Fri, 26 Jul 2013 18:39:18 -0400
From: Yaniv Sapir <yaniv@...pteva.com>
To: john-dev@...ts.openwall.com
Subject: Re: Parallella: Litecoin mining
Technically, you could definitely run code from other core's local mem.,
just like running from external mem. What you should keep in mind is that
the implementation must be thread-safe (which is true for your data buffers
as well), and that the stack should be private per-thread (which is
provided by the internal.ldf and fast.ldf profiles, initializing the stack
to the top of the local mem.).
Also keep in mind that the execution will be slower than from local mem.
(yet, much faster than execution from external mem.).
Yaniv.
On Fri, Jul 26, 2013 at 6:26 PM, Rafael Waldo Delgado Doblas <
lord.rafa@...il.com> wrote:
> Hello Yaniv,
>
>
> 2013/7/26 Yaniv Sapir <yaniv@...pteva.com>
>
>> Rafael,
>>
>> As a starting point, consider using (a) neighbor core(s) local memory to
>> store parts of your big array. It is much faster to retrieve data from an
>> on-chip memory than the external memory. Obviously, it means that you are
>> either not going to use the adjacent core for processing in parallel, or
>> you need to write the program in a way that core groups share the same data
>> buffer(s) (I am not familiar with the algorithm so I don't know if "V"
>> needs to be modified during the calculation).
>>
>> Yaniv.
>>
>>
> V will be modified several times during the calculation and will need
> whole 32KB per core. Can I load the binary executable image in just one
> core memory area and run it from the rest of the cores?
>
> If we can do that the memory map will looks something like:
>
> 0-31K for V on first core
> 32-63K for V on second core
> ...
> 416-447K for V on fourteenth core
> 448-479K for V on fifteenth core
>
> 480-?? for binary executable image
> ??-??? for XY B first core.
> ....
> ??-??? for XY B fifteenth core.
>
> With this approach only 15 of 16 cores can be used because there is no
> memory for the sixteenth core.
>
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