gpuowl: runtime error

This on debian buster,
Here's an extract of the program output:


Note: using short, fused carry and fused tail kernels
OpenCL compilation in 616 ms, with " -DEXP=84674341u -I. -cl-fast-relaxed-math -cl-kernel-arg-info "
PRP-3: FFT 5000K (625 * 4096 * 2) of 84674341 (16.54 bits/word) [2018-03-01 19:57:46 CET]
Starting at iteration 0
error -55 (fft4K)
gpuowl: clwrap.h:267: void run(cl_queue, cl_kernel, size_t, size_t, const string&): Assertion `check(clEnqueueNDRangeKernel(queue, kernel, 1, __null, &workSize, &groupSize, 0, __null, __null), name.c_str())' failed.
Aborted

[preda]

-55 is "invalid work item size". Apparently the OpenCL system you're using does not support a 512 workgroup size.

Originally Posted by SELROC

This on debian buster,
Here's an extract of the program output:


Note: using short, fused carry and fused tail kernels
OpenCL compilation in 616 ms, with " -DEXP=84674341u -I. -cl-fast-relaxed-math -cl-kernel-arg-info "
PRP-3: FFT 5000K (625 * 4096 * 2) of 84674341 (16.54 bits/word) [2018-03-01 19:57:46 CET]
Starting at iteration 0
error -55 (fft4K)
gpuowl: clwrap.h:267: void run(cl_queue, cl_kernel, size_t, size_t, const string&): Assertion `check(clEnqueueNDRangeKernel(queue, kernel, 1, __null, &workSize, &groupSize, 0, __null, __null), name.c_str())' failed.
Aborted

Originally Posted by preda

-55 is "invalid work item size". Apparently the OpenCL system you're using does not support a 512 workgroup size.

Thanks, what should I do to make the program work ?

perhaps install a different opencl package ?

Originally Posted by SELROC

Thanks, what should I do to make the program work ?

perhaps install a different opencl package ?

I can modify the program if this is necessary, but I would need guidance from the author

Originally Posted by preda

-55 is "invalid work item size". Apparently the OpenCL system you're using does not support a 512 workgroup size.

Effectively the max work group size is 256.

How should I modify the program to make it work with this hardware ?

Thank you

[preda]

Originally Posted by SELROC

Effectively the max work group size is 256.

How should I modify the program to make it work with this hardware ?

Thank you

There's no easy way (to use workgroup 256 in this situation) I can think of.

If you install amdgpu-pro or ROCm, you should be able to use WG up to 1024.

In the next update I'll try to move back to 256.

Originally Posted by preda

There's no easy way (to use workgroup 256 in this situation) I can think of.

If you install amdgpu-pro or ROCm, you should be able to use WG up to 1024.

In the next update I'll try to move back to 256.

Thanks very much, I look forward for the mods.

selroc

Originally Posted by preda

There's no easy way (to use workgroup 256 in this situation) I can think of.

If you install amdgpu-pro or ROCm, you should be able to use WG up to 1024.

In the next update I'll try to move back to 256.

Somehow I got the program to work by reinstalling a fresh debian testing and amdgpu-pro

It is running right now

Originally Posted by SELROC

Somehow I got the program to work by reinstalling a fresh debian testing and amdgpu-pro

It is running right now

gpuOwL v2.0--mod GPU Mersenne primality checker
Ellesmere-36x1360-@4:0.0 Radeon RX 580 Series
Note: using short, fused carry and fused tail kernels
OpenCL compilation in 628 ms, with " -DEXP=84701459u -I. -cl-fast-relaxed-math -cl-kernel-arg-info "
PRP-3: FFT 5000K (625 * 4096 * 2) of 84701459 (16.54 bits/word) [2018-03-02 18:05:01 CET]
Starting at iteration 142500
OK 142500 / 84701459 [ 0.17%], 0.00 ms/it [0.00, 0.00], check 3.73s; ETA 0d 00:00; 821d3202550d3c23 [18:05:06]
OK 143000 / 84701459 [ 0.17%], 5.29 ms/it [5.29, 5.29], check 3.33s; ETA 5d 04:21; 71d0fd7863001c6d [18:05:11]
OK 144000 / 84701459 [ 0.17%], 5.00 ms/it [4.70, 5.29], check 3.32s; ETA 4d 21:24; 5f059bf89d226260 [18:05:20]
OK 145000 / 84701459 [ 0.17%], 5.01 ms/it [4.71, 5.30], check 3.32s; ETA 4d 21:36; 5055eab68c2355f2 [18:05:28]
OK 150000 / 84701459 [ 0.18%], 4.77 ms/it [4.71, 5.31], check 3.33s; ETA 4d 16:01; 6dc264064ce6830b [18:05:55]
OK 160000 / 84701459 [ 0.19%], 4.84 ms/it [4.72, 6.13], check 3.37s; ETA 4d 17:45; 7bd9b48b95f55663 [18:06:47]
OK 170000 / 84701459 [ 0.20%], 4.79 ms/it [4.72, 5.47], check 3.37s; ETA 4d 16:34; 4504231bf5b0b0af [18:07:38]
OK 180000 / 84701459 [ 0.21%], 4.80 ms/it [4.73, 5.49], check 3.37s; ETA 4d 16:46; 9500155d9891ec05 [18:08:30]
OK 200000 / 84701459 [ 0.24%], 4.79 ms/it [4.73, 5.38], check 3.40s; ETA 4d 16:20; 1cfb4f382ad7729b [18:10:09]
OK 220000 / 84701459 [ 0.26%], 4.79 ms/it [4.73, 5.40], check 3.38s; ETA 4d 16:21; 0d2bb5f1d3f7f8f0 [18:11:48]
OK 240000 / 84701459 [ 0.28%], 4.79 ms/it [4.73, 5.40], check 3.37s; ETA 4d 16:20; 009378cb131480c5 [18:13:27]
OK 260000 / 84701459 [ 0.31%], 4.82 ms/it [4.74, 5.41], check 3.38s; ETA 4d 17:04; 3c8ca29ba50ac4f6 [18:15:07]
OK 300000 / 84701459 [ 0.35%], 4.79 ms/it [4.73, 5.52], check 3.38s; ETA 4d 16:23; 2cef54e6f19b57f3 [18:18:22]

One thing I notice with two instances of gpuowl running: one instance gets stuck and the only way to stop it is reboot

Originally Posted by SELROC

One thing I notice with two instances of gpuowl running: one instance gets stuck and the only way to stop it is reboot

Hello Mihai, have you attempted yet to reproduce the error ?

I have reinstalled debian-testing with amdgpu-pro and still getting the same error: if two instances of gpuowl are launched, the first remains in a blocked state and we can only reboot to stop it.

However, the normal reboot will not work (with a message: "watchdog did not stop") and we can only switch off the power to reboot.

My GPU hardware is Radeon RX 580