问题
I tried to debug my CUDA application with cuda-gdb but got some weird error.
I set option -g -G -O0 to build my application. I could run my program without cuda-gdb, but didn't get correct result. Hence I decided to use cuda-gdb, however, I got following error message while running program with cuda-gdb
Error: Failed to read the valid warps mask (dev=1, sm=0, error=16).
What does it means? Why sm=0 and what's the meaning of error=16?
Update 1: I tried to use cuda-gdb to CUDA samples, but it fails with same problem. I just installed CUDA 6.0 Toolkit followed by instruction of NVIDIA. Is it a problem of my system?
Update 2:
- OS - CentOS 6.5
- GPU
- 1 Quadro 400
- 2 Tesla C2070
- I'm using only 1 GPU for my program, but I've got same bug message from any GPU that I selected
- CUDA version - 6.0
- GPU Driver
- NVRM version: NVIDIA UNIX x86_64 Kernel Module 331.62 Wed Mar 19 18:20:03 PDT 2014
- GCC version: gcc version 4.4.7 20120313 (Red Hat 4.4.7-4) (GCC)
Update 3: I tried to get more information in cuda-gdb, but I got following results
(cuda-gdb) info cuda devices
Error: Failed to read the valid warps mask (dev=1, sm=0, error=16).
(cuda-gdb) info cuda sms
Focus not set on any active CUDA kernel.
(cuda-gdb) info cuda lanes
Focus not set on any active CUDA kernel.
(cuda-gdb) info cuda kernels
No CUDA kernels.
(cuda-gdb) info cuda contexts
No CUDA contexts.
回答1:
Actually, this issue is only specific to some old NVIDIA GPUs(like "Quadro 400", "GeForce GT220", or "GeForce GT 330M", etc).
On Liam Kim's setup, cuda-gdb should work fine by set environment variable "CUDA_VISIBLE_DEVICES", and let cuda-gdb running on Tesla C2070 GPUs specifically. I.e $export CUDA_VISIBLE_DEVICES=0 (or 2) - the exact CUDA devices index could be found by running cuda sample - "deviceQuery".
And now, this issue has been fixed, the fix would be availble for CUDA developers in the next CUDA release(it will be posted out around early July, 2014).
回答2:
This is internal cuda-gdb bug. You should report a bug.
Can you try installing CUDA toolkit from the package on NVIDIA site?
来源：https://stackoverflow.com/questions/23997350/cuda-gdb-error-message