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"At more than one quadrillion floating point operations per second..." - how fast is that when cracking typical passwords or mining bitcoins? If we have an encr
by hamoid 14y ago
"At more than one quadrillion floating point operations per second..." - how fast is that when cracking typical passwords or mining bitcoins? If we have an encrypted drive, how long would it take to find the passphrase with it?
- dmm 14y agoBitcoin uses double SHA256 which is all integer operations, so that's not directly comparable to flops. As far as I know most passwords hashes are also integer operations. The cell processor in the ps3, despite being optimized for floating point ops, can do about 22.23 Mh/s. Assuming each of the 12,960 PowerXCell 8is in Roadrunner can do the same: 12960 * 23.23 ~= 288100 Mh/s which would earn you about 21.6 BTC/day at the current difficulty. That's about $2000/day at current prices. The PowerXCells also have 8 SPUs vs 6 in the ps3, so they are potentially 25% faster.
- moconnor 14y agoFor bitcoin mining you probably want to use Titan's 56k GPUs. I've run jobs at full scale on Titan, sometimes I forget it can be pretty cool to be in HPC!
- m_mueller 14y agoI'm also interested in what language and tooling you're using, plus the scientific field. Depending on what you do, you might be interested in [1]. It's my current project dealing with better tooling for CPU and GPU compatible Fortran code. [1] http://github.com/muellermichel/Hybrid-Fortran http://github.com/muellermichel/Hybrid-Fortran
- amcintyre 14y agoI would assume that a Titan card is just as horrible for mining as any other NVIDIA card, both in terms of hardware cost and power usage.
- imajes 14y agomight be kind of interesting to do an IamA on reddit. I'd like to hear more about what it's like to work in HPCs -- even simply considering how to build that kind of processing and how to think in terms of jobs that take real time to complete.