Date: Thu, 16 Apr 2015 22:10:03 +0300 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: [GSoC] John the Ripper support for PHC finalists Agnieszka, On Thu, Apr 16, 2015 at 08:55:27PM +0200, Agnieszka Bielec wrote: > if gpu isn't faster than cpu, implementing opencl to john the ripper > makes any sense? Yes, it does! Support for PHC finalists is primarily a research project. Results such as yours might affect the selection of PHC winners, and/or eventual adoption of these hashing schemes. Also, performance may vary across devices, including e.g. future GPUs vs. future CPUs, and for different m_cost and t_cost (what if you try even lower m_cost?) We should be able to re-run such performance tests in the future. And it may be easier and even more cost-effective to install multiple GPUs than multiple CPUs in a system. Currently, it is cost-effective to build up to 8 GPU machines, whereas a machine with 8 CPU chips may cost substantially more. So it may be 8 GPUs + 2 CPUs vs. 2 CPUs alone per chassis. Obviously, a machine with 10 chips will win over one with 2 chips even with same per-chip performance. We similarly have bcrypt-opencl, even though it's not faster than its host CPU counterpart per-chip. > why is only 1 GPU on super now? I am still seeing all GPUs: [solar@...er ~]$ clinfo | grep '^ Name:' Name: Tahiti Name: Tahiti Name: Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz Name: Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz Name: Intel(R) Many Integrated Core Acceleration Card Name: GeForce GTX TITAN If "john" does not see the two Tahiti's for you, and it's not because of any change in your tree, then I guess this indicates an AMD driver issue, and we probably need to reboot. Please let me know (off-list). Thanks, Alexander
Powered by blists - more mailing lists
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.