hashcat Forum

Hi,

I am scratching my head why the performance of a specific hashmode (sha512crypt) is delivering a poor performance:

prompt> ~/hashcat-5.1.0/hashcat -D1,2 -b -m1800           
hashcat (v5.1.0) starting in benchmark mode...

[..]
OpenCL Platform #1: Advanced Micro Devices, Inc.
================================================
* Device #1: gfx902-xnack, 12817/15079 MB allocatable, 11MCU

OpenCL Platform #2: Intel(R) Corporation
========================================
* Device #2: AMD Ryzen 5 2400G with Radeon Vega Graphics, 7539/30159 MB allocatable, 8MCU

Benchmark relevant options:
===========================
* --opencl-device-types=1,2
* --optimized-kernel-enable

Hashmode: 1800 - sha512crypt $6$, SHA512 (Unix) (Iterations: 5000)

Speed.#1.........:     5947 H/s (47.22ms) @ Accel:64 Loops:32 Thr:64 Vec:1
Speed.#2.........:     2530 H/s (80.15ms) @ Accel:512 Loops:256 Thr:1 Vec:4
Speed.#*.........:     8478 H/s

Started: Fri May 31 13:06:58 2019
Stopped: Fri May 31 13:07:07 2019

prompt> 

As this was something beyond what I expected a googled a bit and stumbled over this: https://hashcat.net/forum/thread-7513.html .

I seems @wakawaka had for for the same hardware a way better performance for this hash [ Speed.Dev.#1.....:    21851 H/s (101.84ms) @ Accel:256 Loops:64 Thr:64 Vec:1] while the other results are more in line with what I have. Comparing to what else I have here and what google returned my I am wondering why this specific performance is so poor and a not even a third from Windows.

Drivers: ROCm for GPU, OpenCL for CPU. Using Kernel 5.0.8 with the builtin kfd driver.

Hint would be much appreciated.


Cheers, Dirk

(to be clear: I am fine with the CPU performance but not with what the GPU delivers)

the operating system ideally makes no difference (except if you did some specific tuning with one benchmark and didn't with another). I would suggest to test at least the same versions to make a 1:1 comparison and furthemore it would make sense that you test the beta version from https://hashcat.net/beta too
Thx

Thanks but the difference is a factor of 3.5 . Unless you're indicating hashcat became worst and has a severe regression: why would I use the old version? (I did try 4.2.1 before and it was similar).

I tried now v5.1.0-1116-g3c603019 has for mode 1800 / sha512crypt around 6500, which is an improvement (thx) but no 22k as wakawaka claims.

> the operating system ideally makes no difference

you mean in terms of userland?

What I was trying to say is either wakawaka has made an error while copying or something else is wrong. Or maybe the ROCm driver has a problem, or the kernel interface -- whatsoever. This is what I try to understand.

Run the test again but with the CPU disabled as it is by default. Your high usage of the CPU is likely capping the performance of the integrated graphics.

Good point but: Nope, it's absolutely the same. I just had the CPU mentioned for showing a picture of the small difference also between CPU and GPU.

v5.1.0-1116-g3c603019:
----------------------------
prompt> /tmp/hashcat-5.1.0/hashcat.bin -b -m 1800
hashcat (v5.1.0-1116-g3c603019) starting in benchmark mode...
[..]
Hashmode: 1800 - sha512crypt $6$, SHA512 (Unix) (Iterations: 5000)

Speed.#1.........: 6519 H/s (83.60ms) @ Accel:8 Loops:128 Thr:256 Vec:1

Started: Fri May 31 17:29:30 2019
Stopped: Fri May 31 17:30:23 2019

prompt> /tmp/hashcat-5.1.0/hashcat.bin -b -D1,2 -m 1800
hashcat (v5.1.0-1116-g3c603019) starting in benchmark mode...
[..]
Hashmode: 1800 - sha512crypt $6$, SHA512 (Unix) (Iterations: 5000)

Speed.#1.........: 6509 H/s (87.24ms) @ Accel:16 Loops:64 Thr:256 Vec:1
Speed.#2.........: 2484 H/s (81.77ms) @ Accel:512 Loops:256 Thr:1 Vec:4
Speed.#*.........: 8993 H/s

Started: Fri May 31 17:30:40 2019
Stopped: Fri May 31 17:31:35 2019
prompt>

If anybody has a similar system as wakawake (Windows + Ryzen 5 2x00G or maybe 2x00U) it would be great if (s)he can confirm the ~22kH/s for mode 1800 (sha512crypt).

Then I have a better reason to get in touch with the ROCm maintainers

FYI: with a new kernel and new ROCm drivers it's way better (but still the half of the H/s under Windows):

---
prompt> uname -a
Linux REDACTED 5.1.5-1-default #1 SMP Mon May 27 07:14:33 UTC 2019 (6ad4f79) x86_64 x86_64 x86_64 GNU/Linux
prompt> hashcat -I | grep Driver.Version. # above was 2814.0
Driver.Version.: 2874.0 (HSA1.1,LC)
[..]
prompt> hashcat -D1,2 -b -m1800
hashcat (v5.1.0) starting in benchmark mode...
[..]
OpenCL Platform #2: Intel(R) Corporation
========================================
* Device #2: AMD Ryzen 5 2400G with Radeon Vega Graphics, 7539/30159 MB allocatable, 8MCU

Benchmark relevant options:
===========================
* --opencl-device-types=1,2
* --optimized-kernel-enable

Hashmode: 1800 - sha512crypt $6$, SHA512 (Unix) (Iterations: 5000)

Speed.#1.........: 7614 H/s (70.12ms) @ Accel:128 Loops:32 Thr:64 Vec:1
Speed.#2.........: 2592 H/s (78.17ms) @ Accel:512 Loops:256 Thr:1 Vec:4
Speed.#*.........: 10206 H/s
[..]
---

The effect of the newer version is even better:

prompt> /tmp/hashcat-5.1.0/hashcat.bin -b -D1,2 -m 1800
hashcat (v5.1.0-1116-g3c603019) starting in benchmark mode...
[..]
Hashmode: 1800 - sha512crypt $6$, SHA512 (Unix) (Iterations: 5000)

Speed.#1.........: 10672 H/s (51.34ms) @ Accel:4 Loops:256 Thr:256 Vec:1
Speed.#2.........: 2586 H/s (78.47ms) @ Accel:128 Loops:1024 Thr:1 Vec:4
Speed.#*.........: 13258 H/s
[..]
prompt>
---


On the flip side of the coin: If run the benchmark w/o any "m" option version 5.1.0 bails out:
----
[..]
Hashmode: 1400 - SHA2-256

clBuildProgram(): CL_BUILD_PROGRAM_FAILURE

* Device #1: Kernel REDACTED/hashcat-5.1.0/OpenCL/m01400_a3-optimized.cl build failed - proceeding without this device.

: error: undefined hidden symbol: m01400m
>>> referenced by REDACTED/hashcat-5.1.0/OpenCL/t_13390_101-838704.o:(m01400_m04)
[..]
: error: undefined hidden symbol: m01400s
>>> referenced by REDACTED/hashcat-5.1.0/OpenCL/t_13390_101-838704.o:(m01400_s16)
Error: Creating the executable from LLVM IRs failed.

---

Fixed with latest beta