I'm testing new oclhashcat-plus version and I found a speed problem: on AMD HD7950 GPU (13.4 driver) and dictionary+rules setting, attack speed is ~2 GH/s! On same hardware (same driver) and settings, but previous version of oclhashcat, attack speed is ~4 GH/s!! Why?!
New oclhashcat-plus and speed poblems...
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09-03-2013, 05:46 PM
Which versions of OclHashcat are you referring to? Maybe a difference in the default workload tuning (-n and -u)?
09-03-2013, 05:57 PM
No difference:
Code: oclHashcat-plus v0.15: Code: oclHashcat-plus v0.14:
09-03-2013, 07:18 PM
There are a couple of things to consider. First, is your GPUs all at 99% when you do your tests? Also for the main explanation of the possible differences, read the announcement for v0.15. It's all detailed there.
Yes, my GPU works at 99% in both cases. In other words, the new version is ~50% slower than previous version about single-MD5 hash attack (dictionary+rules). It's a huge negative difference! This issue forces us to use both versions...
09-03-2013, 07:47 PM
Yes, it's true, it's slower, but not 50%. From my tests single hash MD5 with rule based attacks drop is around 25%
Make sure to read the release notes. You need to prepare your dictionaries
09-03-2013, 07:56 PM
09-03-2013, 08:18 PM
(09-03-2013, 07:47 PM)atom Wrote: Yes, it's true, it's slower, but not 50%. From my tests single hash MD5 with rule based attacks drop is around 25% Ok but 25% (~1 GH/s on HD7950) is too a large negative gap and we have to work more on wordlists, especially if they are huge! Thank you very much for everything else. (09-03-2013, 07:56 PM)mastercracker Wrote: Just remember that 0.14 has surely a timebomb to it and will stop working in about 4 months from now. ???
09-04-2013, 07:12 PM
09-04-2013, 09:02 PM
(09-04-2013, 07:12 PM)epixoip Wrote: Even though the posted speed is slower your attacks will still probably finish faster due to the new workload dispatcher. I don't think so. I tested simple-MD5, MD5(Unix) and phpBB3 hashes and oclHashcat-plus v0.14 has completed the attack more quickly than about 25-30%. v0.15 version has many other cool features, but it is much slower. |
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