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Message-ID: <CACxgy5zjfqBSCoYJ44dZsg=7GnTg_KiLJniWCc=6iiaUUN8BpA@mail.gmail.com>
Date: Sat, 29 Feb 2020 10:16:44 -0500
From: Powen Cheng <madtomic@...il.com>
To: john-users@...ts.openwall.com
Subject: Re: PCI express
Thank you Alexander for your input.
Do you know or anyone know if tezos2john.py
<https://github.com/magnumripper/JohnTheRipper/blob/bleeding-jumbo/run/tezos2john.py>
this type of cracking, Will the speed of the pci express matter much?
Powen
On Sat, Feb 29, 2020 at 9:45 AM Solar Designer <solar@...nwall.com> wrote:
> Hi,
>
> On Sat, Feb 29, 2020 at 09:11:20AM -0500, Powen Cheng wrote:
> > Does it matter is a card is on pci express 3.0 x16 or pci express 2.0 x1
> > slot?
> >
> > Will the higher bandwidth perform better and generate more hash rate?
>
> This depends on hash type and cracking mode. For slow hashes (and
> "non-hashes"), the difference will be small. For faster hashes, the
> difference will be substantial, except that for the fastest hashes when
> using on-device mask mode it'll be small again.
>
> In other words, when using JtR, PCIe bandwidth has the most impact on
> medium-speed hashes - e.g., on md5crypt. It is mostly irrelevant for
> the slowest hashes (they're similarly slow either way) and for the
> fastest hashes (even the fastest PCIe isn't fast enough for them, so
> they need on-device mask mode to reach the device's full potential).
>
> Alexander
>
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