Cannot use more than one GPU

[PlamenVasilev]

I'm trying to use btcrecover under windows with 4 GPUs
The setup is made as it is written on the setup guide.

PS C:\btcrecover> python .\btcrecover.py --list-gpu
#1 Tahiti
#2 Tahiti
#3 Hawaii
#4 Hawaii
#5 Intel(R) Celeron(R) CPU G1840 @ 2.80GHz

Everything looks normal and working, so I try to use one GPU

PS C:\btcrecover> python .\btcrecover.py --wallet dc.dat --performance --enable-gpu
btcrecover.py: error: can't automatically determine best GPU(s), please use the --gpus option

As I see there is no --gpus option, but we have --gpu-name so I tried one GPU

PS C:\btcrecover> python .\btcrecover.py --wallet dc.dat --performance --no-dupchecks --enable-gpu --gpu-name "#1"
Wallet difficulty: 107,142 SHA-512 iterations
Using OpenCL GPU Tahiti
- 8192  elapsed: 0:00:06  rate:   1.21 kP/s
Interrupted after finishing password # 8192

Looks good, but when I try to use more than one GPU i receive this error:

PS C:\btcrecover> python .\btcrecover.py --wallet dc.dat --performance --no-dupchecks --enable-gpu --gpu-names "#1,#2"
btcrecover.py: error: can't find GPU whose name contains '#1,#2' (use --list-gpus to display available GPUs)

And currently I cannot use more than one GPU :(

How this can be fixed?

p.s. I'm using Power shell, but I have tried with cmd.exe also and the result is the same. the only difference is that in powershell the gpu names have to be in " "

[kost123]

--gpu-names=1,2 without #

Good luck

[PlamenVasilev]

It doesn't work

PS C:\btcrecover> python .\btcrecover.py --wallet dc.dat --performance --no-dupchecks --enable-gpu --gpu-names=1,2
btcrecover.py: error: unrecognized arguments: 2

When I wrap them in "" the result is:

PS C:\btcrecover> python .\btcrecover.py --wallet dc.dat --performance --no-dupchecks --enable-gpu --gpu-names="1,2"
btcrecover.py: error: can't find GPU whose name contains '1,2' (use --list-gpus to display available GPUs)

[kost123]

Works fine for me..

btcrecover.py --wallet=wallet.dat --no-dupchecks --enable-gpu --performance --gpu-names=1,2
Using 2 OpenCL devices:
GPU GeForce GTX 1080 Ti
GPU GeForce GTX 1080

• 16384 elapsed: 0:00:05 rate: 3.08 kP/s
  Interrupted after finishing password # 16384

I'm on windows though..

@gurnec

[gurnec]

Oops, that --gpus error message is now fixed, thanks for catching it.

Actually the syntax changed in a recent version to better match up with the standard way which most other Python programs parse multiple arguments to a single option.

As per the new --help message,

  --gpu-names NAME-OR-ID [NAME-OR-ID ...]
                        choose GPU(s) on multi-GPU systems (default: auto)

so it's --gpu-names 1 2 or --gpu-names 1 2 3 4, etc.

Likewise if you want to use different --global-ws or --local-ws options on a per-GPU basis, e.g. --gpu-names 1 2 3 4 --global-ws 2048 2048 4096 4096.

[PlamenVasilev]

yes, the last one is working.
Thanks!

[winnph]

I'm getting a segmentation fault when I try to do this:

 winn@alpha:~/btcrecover-master$ ./btcrecover.py --list-gpus
 Starting btcrecover 0.17.10 on Python 2.7.13 64-bit, 21-bit unicodes, 64-bit ints
 #1 pthread-Intel(R) Core(TM) i5-6400 CPU @ 2.70GHz
 #2 Intel(R) Core(TM) i5-6400 CPU @ 2.70GHz
 #3 GeForce GTX 1060 3GB
 #4 GeForce GTX 1060 3GB
 winn@alpha:~/btcrecover-master$ ./btcrecover.py --wallet wallet.dat --performance --enable-gpu --gpu-names 3 4 --global-ws 65536 65536 --local-ws 1024 1024
 Starting btcrecover 0.17.10 on Python 2.7.13 64-bit, 21-bit unicodes, 64-bit ints
 Segmentation fault

It works fine with just --gpu-names 3, but when I try to use 4 alone it gives this error:

 winn@alpha:~/btcrecover-master$ ./btcrecover.py --wallet wallet.dat --performance --enable-gpu --gpu-names 4 --global-ws 65536 --local-ws 1024
 Starting btcrecover 0.17.10 on Python 2.7.13 64-bit, 21-bit unicodes, 64-bit ints
 btcrecover.py: warning: --performance without --no-dupchecks will eventually cause an out-of-memory error
 Wallet difficulty: 80,645 SHA-512 iterations
 Traceback (most recent call last):
   File "./btcrecover.py", line 38, in <module>
     (password_found, not_found_msg) = btcrpass.main()
   File "/home/winn/btcrecover-master/btcrecover/btcrpass.py", line 5489, in main
     print("Using OpenCL", pyopencl.device_type.to_string(cl_devices[0].type), cl_devices[0].name.strip())
   File "/usr/lib/python2.7/dist-packages/pyopencl/cffi_cl.py", line 291, in to_string
     % (value, cls.__name__))
ValueError: a name for value 3 was not found in device_type

Any idea what's going on here?

[winnph]

The problem is btcrecover is not assigning the numbers correctly, and numbers 1, 2 and 4 were all attempting to use the CPU instead. This works, though:

winn@alpha:~/btcrecover-master$ ./btcrecover.py --wallet wallet.dat --performance --enable-gpu --gpu-names "geforce" "geforce" --global-ws 65536 --local-ws 1024
Starting btcrecover 0.17.10 on Python 2.7.13 64-bit, 21-bit unicodes, 64-bit ints
btcrecover.py: warning: --performance without --no-dupchecks will eventually cause an out-of-memory error
Wallet difficulty: 80,645 SHA-512 iterations
Using 2 OpenCL devices:
  GPU GeForce GTX 1060 3GB
  GPU GeForce GTX 1060 3GB
\ 393216  elapsed: 0:00:40  rate:   9.76 kP/s