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Date: Fri, 4 Dec 2020 15:34:12 +0100
From: r.wiesbach@....de
To: john-users@...ts.openwall.com, Solar Designer <solar@...nwall.com>
Subject: Re: dmg-opencl low performance/ low gpu utilisation
>
> Given the iteration counts and the speeds you report below, the above is
> probably misreporting. I suggest you install AMD's tools to monitor GPU
> utilization and temperatures. You should also be able to notice high
> utilization through the noise and heat the GPU cards produce.
Can you please specify the AMD tool you mention?
> That's weird. I don't recall us having different default verbosity
> level on Windows.
>
> It's right in there in doc/OPTIONS (including in 1.9.0-jumbo-1):
>
> You can use "-v=5" for maximum verbosity.
Sorry, saying "manual", but I was actually reading the
no-parameter-output of john.exe
Turns out that It needs at least v=4 (even explicit -v=3 does not show
it). The output however is different to your example. It is a separate line.
> It's interesting your two GPUs produce different speeds. Assuming none
> of the hashes got cracked so far and the GPUs are identical, this could
> be because of different auto-tuning (the LWS and GWS figures) or it
> could be because of worse cooling for one of the GPUs.
The result of GPU2 is not stable, even though I interrupted the running
attack. GPU1 seems rather stable:
GPU2:
Local worksize (LWS) 64, global worksize (GWS) 73728 (1152 blocks)
~521000 real, ~7800K virtual
GPU2:
Local worksize (LWS) 64, global worksize (GWS) 18432 (288 blocks)
~480000 real, ~ ~3300K virtual
GPU2:
Local worksize (LWS) 64, global worksize (GWS) 73728 (1152 blocks)
~522000 real, ~ 23500K virtual
GPU1:
Local worksize (LWS) 64, global worksize (GWS) 18432 (288 blocks)
~463000-466000 real, ~ 2600K -3000K virtual
Temperature in John is -1, so it cannot read the value.
Let me say thank you for your help again :)
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