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Date: Mon, 11 Jan 2016 14:57:10 +0100
From: patpro@...pro.net
To: john-users@...ts.openwall.com
Subject: Re: meaning of p/s, c/s and C/s

On 11 janv. 2016, at 08:18, magnum <john.magnum@...hmail.com> wrote:

>> I've waited 51 minutes, then ended the process. After a quick calculation, I realized it should have taken about 1h and few minutes to complete the 4 character space at 4*940 p/s, but it's no big deal. I'm just very surprised the ETA can be so wrong on a short session. May be it's too short to get the opportunity to adjust, as I've seen in previous multi-day sessions.
> 
> I'm pretty sure we have a bug in mask mode ETA calculation but I've yet to nail it. There are so many combinations: node/fork, resume, hybrid, GPU-side mask and so on. In most cases, ETA is correct but sometimes I notice it gets screwed up.
> 
> In this case, you used fork and pure mask. Maybe we should have a closer look at that. There were incorrect bug fixes in the past, that fixed something but broke something else. Those fixes were reverted but the original problem may still be present.

Thanks for those informations.

I've tried with a 7 digits mask and had the same behavior: reached "100%" in about 10 minutes and displayed N/A until it really finished after 44 minutes (total).

I've launched another session with a 8 digits mask, and so far, the ETA seems correct:

--mask=[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]
Remaining 31394 password hashes with 4092 different salts

1 0g 0:00:00:52 0.20% (ETA: 17:29:57) 0g/s 940.3p/s 3850Kc/s 29549KC/s 46694000..19794000
2 0g 0:00:00:52 0.20% (ETA: 17:28:50) 0g/s 943.6p/s 3870Kc/s 29697KC/s 29794052..91994052
4 0g 0:00:00:52 0.19% (ETA: 17:42:41) 0g/s 913.7p/s 3748Kc/s 28760KC/s 65284057..38384057
3 0g 0:00:00:52 0.19% (ETA: 17:42:41) 0g/s 914.5p/s 3748Kc/s 28765KC/s 65284005..38384005
../..
2 0g 0:03:16:54 44.06% (ETA: 17:40:34) 0g/s 932.3p/s 3815Kc/s 29272KC/s 25551063..97651063
1 0g 0:03:16:54 44.16% (ETA: 17:39:35) 0g/s 934.3p/s 3823Kc/s 29336KC/s 44793011..17893011
4 0g 0:03:16:54 44.15% (ETA: 17:39:42) 0g/s 934.1p/s 3822Kc/s 29328KC/s 00863068..72963068
3 0g 0:03:16:54 44.05% (ETA: 17:40:39) 0g/s 932.1p/s 3814Kc/s 29267KC/s 40531016..13631016


-> 10^8/(4*930*3600) ~ 7 hours and 30 minutes
-> 44% of 7h30 is about 3h20

looks coherent. 

regards,
pat

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