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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