5 ms·

FWIW I got it working with rust and opencl, most of it is written by chatgpt as I have no clue about opencl. GPU usage is only 50-60% and I get 100MH/s. With h

FWIW I got it working with rust and opencl, most of it is written by chatgpt as I have no clue about opencl. GPU usage is only 50-60% and I get 100MH/s. With hashcat and opencl I could get 12GH/s but I couldn't find a way to use hashcat for this use case.

wdfx 2y ago
I've parked CUDA for now, I don't understand it enough to care to fix the tooling. Got an optimised C++ version with no deps averaging about ~24 MH/s on an i7-11800H. I've got 9 zeros; if I get a result that ranks top 10 I think I'll submit and call it a day.
- jonas-w 2y ago
  Wow 24MH/s on an i7 with 8 cores sounds really good! I don't know how I got it working, but I'm now at 3GH/s with my OpenCL implementation. I basically converted 90% of my rust logic to opencl and now my GPU is at 100% usage and I also needed to switch to a tty, as my window manager became unresponsive haha I'm kind of glad about this HN post, as I had absolutely no clue about how sha256 and opencl worked before this challenge. Thanks @quirino
  - quirino 2y ago
    I'm glad you had some fun! This experiment went about as well as I could hope! If anyone's curious, I'm getting 4.5MH/s single-threaded and 12.2MH/s multi-threaded on a slightly old i7 with 4 cores. It's my own C++ implementation, which I've made about 20% faster than the fastest one I found online (Zig/stdlib, also tried Go/stdlib, C++/cgminer, rust/ring, C++/VanitySearch and Python/stdlib). I think it might be faster just because I was able to skip some steps, since all inputs are short and of the same length. I've just finished testing 10^12 inputs. I think I'll stop with 10 zeroes, which is very likely to happen in the next couple of days, according to my calculations. I might revisit it later to learn some GPU programming.
    - jonas-w 2y ago
      Very cool! But same, I also was able to skip some steps as I can make some assumptions about the input as its fixed in length and doesn't need padding. I got lucky and found a hash with 12 zeroes in 60s with my OpenCL implementation, and now I got my second spot back. GPUs are so crazy

wdfx 2y ago

I've parked CUDA for now, I don't understand it enough to care to fix the tooling. Got an optimised C++ version with no deps averaging about ~24 MH/s on an i7-11800H. I've got 9 zeros; if I get a result that ranks top 10 I think I'll submit and call it a day.

jonas-w 2y ago
Wow 24MH/s on an i7 with 8 cores sounds really good! I don't know how I got it working, but I'm now at 3GH/s with my OpenCL implementation. I basically converted 90% of my rust logic to opencl and now my GPU is at 100% usage and I also needed to switch to a tty, as my window manager became unresponsive haha I'm kind of glad about this HN post, as I had absolutely no clue about how sha256 and opencl worked before this challenge. Thanks @quirino
- quirino 2y ago
  I'm glad you had some fun! This experiment went about as well as I could hope! If anyone's curious, I'm getting 4.5MH/s single-threaded and 12.2MH/s multi-threaded on a slightly old i7 with 4 cores. It's my own C++ implementation, which I've made about 20% faster than the fastest one I found online (Zig/stdlib, also tried Go/stdlib, C++/cgminer, rust/ring, C++/VanitySearch and Python/stdlib). I think it might be faster just because I was able to skip some steps, since all inputs are short and of the same length. I've just finished testing 10^12 inputs. I think I'll stop with 10 zeroes, which is very likely to happen in the next couple of days, according to my calculations. I might revisit it later to learn some GPU programming.
  - jonas-w 2y ago
    Very cool! But same, I also was able to skip some steps as I can make some assumptions about the input as its fixed in length and doesn't need padding. I got lucky and found a hash with 12 zeroes in 60s with my OpenCL implementation, and now I got my second spot back. GPUs are so crazy