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23800 RAR3-p (Compressed) performance problem

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23800 RAR3-p (Compressed) performance problem
Campomeister Offline
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#1
08-06-2025, 01:25 PM
Hello! I am having terrible performance of mode 23800 on 10x RTX 4090.
I am using official binaries of hashcat v7.0.0 from hashcat.net, testing on the default hash from the documentation (https://hashcat.net/wiki/doku.php?id=example_hashes). I used mask attack for benchmarking purposes.
I've recorded the tmux session with hashcat, htop and nvidia-smi for demonstration purposes, where you can see the performance issues.

https://asciinema.org/a/O6tpYodIW9JCB2qUyYrTTTiCz - with default workload profile
https://asciinema.org/a/UzjMUUANhl2EdcMBcRC9BYZn0 - with max possible workload profile (-w 4)

Timestamps for -w 4 demo
0:27 - hashcat launched
0:52 - cracking session started (100% GPU util, low CPU util)
1:01 - GPU util drop, CPU util high. I've noticed a lot of hashcat processes in I/O uninterruptible sleep (D)
13:58 - GPU util increasing, CPU util decreasing, hashcat increases "Progress" stat
14:13 - GPU util drop again.

This patten will repeat itself indefinitely

This problem persists on hashcat v7.0.0. As you can see in demos, the speed per gpu is ~2500 H/s which is abhorrent for RTX 4090
Here is a demo for hashcat v6.2.6. I am using max possible workload profile.
https://asciinema.org/a/nHbAixz1OtkPM8DqaebVYLBjL

On this demo hashrate per device is ~150 kH/s, which is expectable.

I would like to provide additional information on this issue on your demand. Hope this gets fixed. Thank you!
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Campomeister Offline
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#2
08-06-2025, 01:47 PM
Some additional info:
Hashcat v7.0.0 works correctly on my local RTX 3060 (driver version - 575.64.05, cuda version - 12.9) and produces ~40kH/s with the same command like in -w 4 demo
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#3
08-06-2025, 02:06 PM
I'll look into as much as possible, because I don't have such a powerful machine. Can you reproduce the same behavior also with a single 4090?
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Campomeister Offline
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#4
08-06-2025, 02:15 PM
(08-06-2025, 02:06 PM)atom Wrote: I'll look into as much as possible, because I don't have such a powerful machine. Can you reproduce the same behavior also with a single 4090?

Thank you for the response! Using the command 
Code:
./hashcat.bin -d 1 -w 4 -m 23800 -a 3 example23800.hash "?a?a?a?a?a?a"
I get ~26kH/s per RTX 4090, which is similar to the cumulative speed from the second demo.
The low usage GPU, high usage IO uninterruptible CPU periods are now shorter (4 periods in 5-6 minutes)

If you need the full demo in asciinema, I can record it.
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#5
08-06-2025, 04:42 PM
OK, thanks for reporting. I think I was able to identify the issue. Please retry with new beta:

https://hashcat.net/beta/hashcat-7.0.0%2B64.7z

Also, I just saw you were not using -O in the command line, but I assume that was intentional for better bug report clarity.
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Campomeister Offline
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#6
08-06-2025, 05:18 PM
(08-06-2025, 04:42 PM)atom Wrote: OK, thanks for reporting. I think I was able to identify the issue. Please retry with new beta:

https://hashcat.net/beta/hashcat-7.0.0%2B64.7z

Also, I just saw you were not using -O in the command line, but I assume that was intentional for better bug report clarity.

Thanks for the fix. New beta solved the root problem.
Your assumption about me not using -O in the command line is correct, although I just tried to run the command
Code:
./hashcat.bin -O -w 4 -m 23800 -a 3 example23800.hash "?a?a?a?a?a?a"

which resulted in this speed

Code:
Session..........: hashcat Status...........: Running Hash.Mode........: 23800 (RAR3-p (Compressed)) Hash.Target......: $RAR3$*1*ad56eb40219c9da2*834064ce*32*13*1*eb47b1ab...8e1*33 Time.Started.....: Wed Aug  6 18:12:13 2025 (1 min, 27 secs) Time.Estimated...: Wed Aug 13 20:33:54 2025 (7 days, 2 hours) Kernel.Feature...: Optimized Kernel (password length 0-20 bytes) Guess.Mask.......: ?a?a?a?a?a?a [6] Guess.Queue......: 1/1 (100.00%) Speed.#01........:  119.7 kH/s (779.37ms) @ Accel:40 Loops:16384 Thr:384 Vec:1 Speed.#02........:  119.6 kH/s (778.48ms) @ Accel:40 Loops:16384 Thr:384 Vec:1 Speed.#03........:  120.5 kH/s (778.45ms) @ Accel:40 Loops:16384 Thr:384 Vec:1 Speed.#04........:  119.5 kH/s (778.90ms) @ Accel:40 Loops:16384 Thr:384 Vec:1 Speed.#05........:  119.9 kH/s (778.27ms) @ Accel:40 Loops:16384 Thr:384 Vec:1 Speed.#06........:  119.8 kH/s (778.54ms) @ Accel:40 Loops:16384 Thr:384 Vec:1 Speed.#07........:  119.5 kH/s (778.55ms) @ Accel:40 Loops:16384 Thr:384 Vec:1 Speed.#08........:  119.7 kH/s (779.11ms) @ Accel:40 Loops:16384 Thr:384 Vec:1 Speed.#09........:  120.3 kH/s (779.17ms) @ Accel:40 Loops:16384 Thr:384 Vec:1 Speed.#10........:  119.9 kH/s (778.86ms) @ Accel:40 Loops:16384 Thr:384 Vec:1 Speed.#*.........:  1198.6 kH/s Recovered........: 0/1 (0.00%) Digests (total), 0/1 (0.00%) Digests (new) Progress.........: 98304000/735091890625 (0.01%) Rejected.........: 0/98304000 (0.00%) Restore.Point....: 0/7737809375 (0.00%) Restore.Sub.#01..: Salt:0 Amplifier:5-6 Iteration:114688-131072 Restore.Sub.#02..: Salt:0 Amplifier:5-6 Iteration:98304-114688 Restore.Sub.#03..: Salt:0 Amplifier:5-6 Iteration:114688-131072 Restore.Sub.#04..: Salt:0 Amplifier:5-6 Iteration:98304-114688 Restore.Sub.#05..: Salt:0 Amplifier:5-6 Iteration:114688-131072 Restore.Sub.#06..: Salt:0 Amplifier:5-6 Iteration:114688-131072 Restore.Sub.#07..: Salt:0 Amplifier:5-6 Iteration:114688-131072 Restore.Sub.#08..: Salt:0 Amplifier:5-6 Iteration:114688-131072 Restore.Sub.#09..: Salt:0 Amplifier:5-6 Iteration:114688-131072 Restore.Sub.#10..: Salt:0 Amplifier:5-6 Iteration:114688-131072 Candidate.Engine.: Device Generator Candidates.#01...: aarier -> a@[119 Candidates.#02...: aP=ena -> a5%ETA Candidates.#03...: amZdie -> a<~WTA Candidates.#04...: aQy%pi -> ak,sus Candidates.#05...: aOapst -> a)p#77 Candidates.#06...: a%iSUS -> aNL#!! Candidates.#07...: aM1ZBO -> auQ1ba Candidates.#08...: ar`pba -> a*Ut23 Candidates.#09...: a_XHHA -> as#CST Candidates.#10...: a7W*ba -> a#S",1 Hardware.Mon.#01.: Temp: 58c Fan: 67% Util:100% Core:2535MHz Mem:10251MHz Bus:8 Hardware.Mon.#02.: Temp: 59c Fan: 68% Util:100% Core:2595MHz Mem:10251MHz Bus:8 Hardware.Mon.#03.: Temp: 54c Fan: 62% Util:100% Core:2640MHz Mem:10251MHz Bus:8 Hardware.Mon.#04.: Temp: 54c Fan: 63% Util:100% Core:2565MHz Mem:10251MHz Bus:8 Hardware.Mon.#05.: Temp: 64c Fan: 71% Util:100% Core:2625MHz Mem:10251MHz Bus:8 Hardware.Mon.#06.: Temp: 64c Fan: 73% Util:100% Core:2535MHz Mem:10251MHz Bus:8 Hardware.Mon.#07.: Temp: 59c Fan: 68% Util:100% Core:2640MHz Mem:10251MHz Bus:4 Hardware.Mon.#08.: Temp: 61c Fan: 70% Util:100% Core:2505MHz Mem:10251MHz Bus:8 Hardware.Mon.#09.: Temp: 56c Fan: 64% Util:100% Core:2505MHz Mem:10251MHz Bus:8 Hardware.Mon.#10.: Temp: 60c Fan: 69% Util:100% Core:2595MHz Mem:10251MHz Bus:4

The command without -O, on the other hand, results in this

Code:
Session..........: hashcat Status...........: Running Hash.Mode........: 23800 (RAR3-p (Compressed)) Hash.Target......: $RAR3$*1*ad56eb40219c9da2*834064ce*32*13*1*eb47b1ab...8e1*33 Time.Started.....: Wed Aug  6 18:15:21 2025 (1 min, 3 secs) Time.Estimated...: Mon Aug 11 16:25:43 2025 (4 days, 22 hours) Kernel.Feature...: Pure Kernel (password length 0-128 bytes) Guess.Mask.......: ?a?a?a?a?a?a [6] Guess.Queue......: 1/1 (100.00%) Speed.#01........:  170.0 kH/s (535.58ms) @ Accel:16 Loops:16384 Thr:1024 Vec:1 Speed.#02........:  172.1 kH/s (526.92ms) @ Accel:16 Loops:16384 Thr:1024 Vec:1 Speed.#03........:  180.9 kH/s (521.82ms) @ Accel:16 Loops:16384 Thr:1024 Vec:1 Speed.#04........:  170.1 kH/s (532.10ms) @ Accel:16 Loops:16384 Thr:1024 Vec:1 Speed.#05........:  181.0 kH/s (523.49ms) @ Accel:16 Loops:16384 Thr:1024 Vec:1 Speed.#06........:  170.7 kH/s (534.46ms) @ Accel:16 Loops:16384 Thr:1024 Vec:1 Speed.#07........:  172.4 kH/s (519.63ms) @ Accel:16 Loops:16384 Thr:1024 Vec:1 Speed.#08........:  170.5 kH/s (534.22ms) @ Accel:16 Loops:16384 Thr:1024 Vec:1 Speed.#09........:  170.0 kH/s (538.47ms) @ Accel:16 Loops:16384 Thr:1024 Vec:1 Speed.#10........:  170.1 kH/s (527.42ms) @ Accel:16 Loops:16384 Thr:1024 Vec:1 Speed.#*.........:  1727.9 kH/s Recovered........: 0/1 (0.00%) Digests (total), 0/1 (0.00%) Digests (new) Progress.........: 104857600/735091890625 (0.01%) Rejected.........: 0/104857600 (0.00%) Restore.Point....: 0/7737809375 (0.00%) Restore.Sub.#01..: Salt:0 Amplifier:5-6 Iteration:32768-49152 Restore.Sub.#02..: Salt:0 Amplifier:5-6 Iteration:49152-65536 Restore.Sub.#03..: Salt:0 Amplifier:5-6 Iteration:147456-163840 Restore.Sub.#04..: Salt:0 Amplifier:5-6 Iteration:32768-49152 Restore.Sub.#05..: Salt:0 Amplifier:5-6 Iteration:147456-163840 Restore.Sub.#06..: Salt:0 Amplifier:5-6 Iteration:32768-49152 Restore.Sub.#07..: Salt:0 Amplifier:5-6 Iteration:65536-81920 Restore.Sub.#08..: Salt:0 Amplifier:5-6 Iteration:32768-49152 Restore.Sub.#09..: Salt:0 Amplifier:5-6 Iteration:32768-49152 Restore.Sub.#10..: Salt:0 Amplifier:5-6 Iteration:49152-65536 Candidate.Engine.: Device Generator Candidates.#01...: aarier -> adq,ie Candidates.#02...: aAb!19 -> aD# $$ Candidates.#03...: a@U $$ -> a[uqta Candidates.#04...: a^l769 -> a9Cxta Candidates.#05...: a0T^(1 -> ax?y00 Candidates.#06...: aR 5st -> a/dTZA Candidates.#07...: aXBzba -> a}MYPI Candidates.#08...: a X2le -> aw|Don Candidates.#09...: ad`$30 -> aBPP45 Candidates.#10...: aDrave -> a=>sja Hardware.Mon.#01.: Temp: 61c Fan: 70% Util:100% Core:2535MHz Mem:10251MHz Bus:8 Hardware.Mon.#02.: Temp: 65c Fan: 72% Util:100% Core:2490MHz Mem:10251MHz Bus:8 Hardware.Mon.#03.: Temp: 59c Fan: 67% Util:100% Core:2535MHz Mem:10251MHz Bus:8 Hardware.Mon.#04.: Temp: 59c Fan: 66% Util:100% Core:2565MHz Mem:10251MHz Bus:8 Hardware.Mon.#05.: Temp: 73c Fan: 79% Util:100% Core:2535MHz Mem:10251MHz Bus:8 Hardware.Mon.#06.: Temp: 71c Fan: 79% Util:100% Core:2535MHz Mem:10251MHz Bus:8 Hardware.Mon.#07.: Temp: 64c Fan: 71% Util:100% Core:2565MHz Mem:10251MHz Bus:4 Hardware.Mon.#08.: Temp: 66c Fan: 75% Util:100% Core:2445MHz Mem:10251MHz Bus:8 Hardware.Mon.#09.: Temp: 59c Fan: 68% Util:100% Core:2535MHz Mem:10251MHz Bus:8 Hardware.Mon.#10.: Temp: 64c Fan: 72% Util:100% Core:2505MHz Mem:10251MHz Bus:4

This is odd.
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atom Offline
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#7
08-06-2025, 05:28 PM
Maybe you haven't read in the v7.0.0 release notes, but the use of -w 4 is highly discouraged with new auto tuner. Stick to -w 3 you should get more natural and better results.
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Campomeister Offline
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#8
08-06-2025, 05:41 PM
(08-06-2025, 05:28 PM)atom Wrote: Maybe you haven't read in the v7.0.0 release notes, but the use of -w 4 is highly discouraged with new auto tuner. Stick to -w 3 you should get more natural and better results.

Thank you for the clarification. It would be great if user received a message about not using -w 4 (like clang did with -Ofast)
Still, even when using -w 3, Pure kernel slightly outperforms Optimized kernel

Optimized

Code:
Session..........: hashcat Status...........: Quit Hash.Mode........: 23800 (RAR3-p (Compressed)) Hash.Target......: $RAR3$*1*ad56eb40219c9da2*834064ce*32*13*1*eb47b1ab...8e1*33 Time.Started.....: Wed Aug  6 18:29:27 2025 (4 mins, 28 secs) Time.Estimated...: Mon Aug 11 14:32:41 2025 (4 days, 19 hours) Kernel.Feature...: Optimized Kernel (password length 0-20 bytes) Guess.Mask.......: ?a?a?a?a?a?a [6] Guess.Queue......: 1/1 (100.00%) Speed.#01........:  175.8 kH/s (94.80ms) @ Accel:5 Loops:16384 Thr:512 Vec:1 Speed.#02........:  176.3 kH/s (94.28ms) @ Accel:5 Loops:16384 Thr:512 Vec:1 Speed.#03........:  177.6 kH/s (93.44ms) @ Accel:5 Loops:16384 Thr:512 Vec:1 Speed.#04........:  175.6 kH/s (94.52ms) @ Accel:5 Loops:16384 Thr:512 Vec:1 Speed.#05........:  176.8 kH/s (93.54ms) @ Accel:5 Loops:16384 Thr:512 Vec:1 Speed.#06........:  175.6 kH/s (94.76ms) @ Accel:5 Loops:16384 Thr:512 Vec:1 Speed.#07........:  176.5 kH/s (93.59ms) @ Accel:5 Loops:16384 Thr:512 Vec:1 Speed.#08........:  175.1 kH/s (95.06ms) @ Accel:5 Loops:16384 Thr:512 Vec:1 Speed.#09........:  174.9 kH/s (95.17ms) @ Accel:5 Loops:16384 Thr:512 Vec:1 Speed.#10........:  175.3 kH/s (94.20ms) @ Accel:5 Loops:16384 Thr:512 Vec:1 Speed.#*.........:  1759.5 kH/s Recovered........: 0/1 (0.00%) Digests (total), 0/1 (0.00%) Digests (new) Progress.........: 469565440/735091890625 (0.06%) Rejected.........: 0/469565440 (0.00%) Restore.Point....: 327680/7737809375 (0.00%) Restore.Sub.#01..: Salt:0 Amplifier:48-49 Iteration:81920-98304 Restore.Sub.#02..: Salt:0 Amplifier:48-49 Iteration:245760-262144 Restore.Sub.#03..: Salt:0 Amplifier:50-51 Iteration:0-16384 Restore.Sub.#04..: Salt:0 Amplifier:48-49 Iteration:81920-98304 Restore.Sub.#05..: Salt:0 Amplifier:49-50 Iteration:81920-98304 Restore.Sub.#06..: Salt:0 Amplifier:48-49 Iteration:81920-98304 Restore.Sub.#07..: Salt:0 Amplifier:49-50 Iteration:32768-49152 Restore.Sub.#08..: Salt:0 Amplifier:48-49 Iteration:0-16384 Restore.Sub.#09..: Salt:0 Amplifier:47-48 Iteration:245760-262144 Restore.Sub.#10..: Salt:0 Amplifier:48-49 Iteration:49152-65536 Candidate.Engine.: Device Generator Candidates.#01...: G!o856 -> G`.(le Candidates.#02...: GmZdie -> Gxc|00 Candidates.#03...: N_cFFA -> N)^ama Candidates.#04...: G7{pon -> GNi$he Candidates.#05...: H%R188 -> H5%ETA Candidates.#06...: G>"EY1 -> Gs\330 Candidates.#07...: HRI`da -> HZe977 Candidates.#08...: GMo,ja -> G<~WTA Candidates.#09...: Ka?ABO -> KpcSON Candidates.#10...: GQy%pi -> G pj19 Hardware.Mon.#01.: Temp: 59c Fan: 69% Util:  0% Core:2385MHz Mem:10251MHz Bus:8 Hardware.Mon.#02.: Temp: 54c Fan: 71% Util:100% Core:2775MHz Mem:10251MHz Bus:8 Hardware.Mon.#03.: Temp: 45c Fan: 65% Util:  0% Core:2790MHz Mem:10251MHz Bus:8 Hardware.Mon.#04.: Temp: 57c Fan: 65% Util:  3% Core:2415MHz Mem:10251MHz Bus:8 Hardware.Mon.#05.: Temp: 69c Fan: 77% Util:100% Core:2430MHz Mem:10251MHz Bus:8 Hardware.Mon.#06.: Temp: 64c Fan: 79% Util:100% Core:2475MHz Mem:10251MHz Bus:8 Hardware.Mon.#07.: Temp: 61c Fan: 71% Util:100% Core:2550MHz Mem:10251MHz Bus:4 Hardware.Mon.#08.: Temp: 59c Fan: 75% Util:100% Core:2775MHz Mem:10251MHz Bus:8 Hardware.Mon.#09.: Temp: 52c Fan: 66% Util:100% Core:2715MHz Mem:10251MHz Bus:8 Hardware.Mon.#10.: Temp: 63c Fan: 73% Util: 94% Core:2430MHz Mem:10251MHz Bus:4

Pure

Code:
Session..........: hashcat Status...........: Running Hash.Mode........: 23800 (RAR3-p (Compressed)) Hash.Target......: $RAR3$*1*ad56eb40219c9da2*834064ce*32*13*1*eb47b1ab...8e1*33 Time.Started.....: Wed Aug  6 18:34:17 2025 (4 mins, 55 secs) Time.Estimated...: Mon Aug 11 03:04:25 2025 (4 days, 8 hours) Kernel.Feature...: Pure Kernel (password length 0-128 bytes) Guess.Mask.......: ?a?a?a?a?a?a [6] Guess.Queue......: 1/1 (100.00%) Speed.#01........:  192.8 kH/s (102.06ms) @ Accel:5 Loops:16384 Thr:616 Vec:1 Speed.#02........:  196.6 kH/s (100.49ms) @ Accel:5 Loops:16384 Thr:616 Vec:1 Speed.#03........:  197.4 kH/s (99.13ms) @ Accel:5 Loops:16384 Thr:616 Vec:1 Speed.#04........:  195.3 kH/s (101.28ms) @ Accel:5 Loops:16384 Thr:616 Vec:1 Speed.#05........:  197.6 kH/s (99.85ms) @ Accel:5 Loops:16384 Thr:616 Vec:1 Speed.#06........:  193.8 kH/s (101.97ms) @ Accel:5 Loops:16384 Thr:616 Vec:1 Speed.#07........:  197.1 kH/s (99.02ms) @ Accel:5 Loops:16384 Thr:616 Vec:1 Speed.#08........:  195.0 kH/s (101.48ms) @ Accel:5 Loops:16384 Thr:616 Vec:1 Speed.#09........:  192.9 kH/s (102.42ms) @ Accel:5 Loops:16384 Thr:616 Vec:1 Speed.#10........:  195.4 kH/s (100.41ms) @ Accel:5 Loops:16384 Thr:616 Vec:1 Speed.#*.........:  1954.0 kH/s Recovered........: 0/1 (0.00%) Digests (total), 0/1 (0.00%) Digests (new) Progress.........: 574801920/735091890625 (0.08%) Rejected.........: 0/574801920 (0.00%) Restore.Point....: 394240/7737809375 (0.01%) Restore.Sub.#01..: Salt:0 Amplifier:49-50 Iteration:81920-98304 Restore.Sub.#02..: Salt:0 Amplifier:52-53 Iteration:16384-32768 Restore.Sub.#03..: Salt:0 Amplifier:52-53 Iteration:229376-245760 Restore.Sub.#04..: Salt:0 Amplifier:51-52 Iteration:32768-49152 Restore.Sub.#05..: Salt:0 Amplifier:52-53 Iteration:245760-262144 Restore.Sub.#06..: Salt:0 Amplifier:50-51 Iteration:0-16384 Restore.Sub.#07..: Salt:0 Amplifier:52-53 Iteration:147456-163840 Restore.Sub.#08..: Salt:0 Amplifier:50-51 Iteration:245760-262144 Restore.Sub.#09..: Salt:0 Amplifier:49-50 Iteration:98304-114688 Restore.Sub.#10..: Salt:0 Amplifier:51-52 Iteration:65536-81920 Candidate.Engine.: Device Generator Candidates.#01...: Ha eba -> H)>.ta Candidates.#02...: I_"|23 -> IYk;pi Candidates.#03...: IQ0RY1 -> I*={ra Candidates.#04...: FR3:90 -> Fk?rra Candidates.#05...: I>Ykst -> I=(130 Candidates.#06...: N7@X00 -> N1fw30 Candidates.#07...: I[7556 -> I<Htta Candidates.#08...: NO'RLE -> Ns+"an Candidates.#09...: H8wfgi -> H |W30 Candidates.#10...: FTcKON -> FxhZ19 Hardware.Mon.#01.: Temp: 64c Fan: 71% Util:  0% Core:2550MHz Mem:10251MHz Bus:8 Hardware.Mon.#02.: Temp: 56c Fan: 74% Util: 10% Core:2790MHz Mem:10251MHz Bus:8 Hardware.Mon.#03.: Temp: 58c Fan: 67% Util:100% Core:2535MHz Mem:10251MHz Bus:8 Hardware.Mon.#04.: Temp: 45c Fan: 68% Util:100% Core:2730MHz Mem:10251MHz Bus:8 Hardware.Mon.#05.: Temp: 72c Fan: 81% Util:100% Core:2565MHz Mem:10251MHz Bus:8 Hardware.Mon.#06.: Temp: 58c Fan: 82% Util:  0% Core:2745MHz Mem:10251MHz Bus:8 Hardware.Mon.#07.: Temp: 65c Fan: 73% Util:100% Core:2625MHz Mem:10251MHz Bus:4 Hardware.Mon.#08.: Temp: 56c Fan: 78% Util:100% Core:2775MHz Mem:10251MHz Bus:8 Hardware.Mon.#09.: Temp: 61c Fan: 69% Util:100% Core:2535MHz Mem:10251MHz Bus:8 Hardware.Mon.#10.: Temp: 66c Fan: 75% Util:100% Core:2595MHz Mem:10251MHz Bus:4
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#9
08-06-2025, 06:44 PM
That is so cool, I haven't even seen that until now. That's because we also improved the crypto library primitives a few weeks ago. And now they become so fast that they are better than then register heavy optimized kernels. Of course that's only for this particulat mode, because it allocates huge register range for every thread. I need to double check that on other GPUs as well, and then simply drop the optimized kernel (and hashcat will fall back to pure kernel).

In regard to -w 4, we will print a warning or so.
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#10
08-06-2025, 07:17 PM
Another idea, since you have so many GPUs in that one box, you will end up with tons of threads running on CPU. With a single GPU it's controllable, but with 10 you might want to play with --hook-threads parameter. start with 1 and increase in small steps, maybe it becomes beneficial at some point
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