Date: Thu, 3 Dec 2020 15:26:27 +0100 From: r.wiesbach@....de To: john-users@...ts.openwall.com Subject: dmg-opencl low performance/ low gpu utilisation Hi, I use dmg-opencl on a two Radeon RX 580 system. However the dmg-opencl has very low utilisation and a speed of only about 2500 pw/s. --test shows Raw 46500 c/s real and 3300 c/s virtual Device 2 (same GPU model as device 1) seems not to be used by default, but using --devices=1,2 --fork=2 there is at most a slight increase in performance (not doubling the pw/s as one would expect) Knowing that some opencl-kernels do not perform well (without rules) I tried --wordlist=wordlist.txt --wordlist=wordlist.txt --rules --wordlist=wordlist.txt --rules=best64 --incremental Additionally i tried using more hashes (5) and the pw/s droped to about 500p/w. As this is 1/5th of 2500 this is the same speed but still low utilization. The wordlist has a size of about 100MB. I did not see an open issue for dmg-opencl on the isssue tracker, so I assume there is some mistake I make that I do not notice. Which mistake is it? Thank you.
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