UserWarning by PyTorch CUBLAS_WORKSPACE_CONFIG can not be parsed

The following errors occur:

python3.8/site-packages/torch/nn/modules/ UserWarning: Could not parse CUBLAS_WORKSPACE_CONFIG, using default workspace size of 8519680 bytes. (Triggered internally at /opt/conda/conda-bld/pytorch_1682343998658/work/aten/src/ATen/cuda/CublasHandlePool.cpp:56.)

lib/python3.8/site-packages/torch/autograd/ UserWarning: Could not parse CUBLAS_WORKSPACE_CONFIG, using default workspace size of 8519680 bytes. (Triggered internally at /opt/conda/conda-bld/pytorch_1682343998658/work/aten/src/ATen/cuda/CublasHandlePool.cpp:56.)

The warning is implemented in Pytorch itself. But i find it impossible to fix it. When setting the CUBLAS_WORKSPACE_CONFIG variable myself the error still occurs.

This seems to not be a problem with the previous major version of pytorch.

The warning is annoying because it gets spammed in our logs so it is difficult to find other warnings.

Any idea why this could occur and how to fix it?



PyTorch version: 2.0.1
Is debug build: False
CUDA used to build PyTorch: 11.8
ROCM used to build PyTorch: N/A

OS: Ubuntu 22.04.2 LTS (x86_64)
GCC version: (Ubuntu 11.3.0-1ubuntu1~22.04.1) 11.3.0
Clang version: Could not collect
CMake version: Could not collect
Libc version: glibc-2.35

Python version: 3.8.16 (default, Mar  2 2023, 03:21:46)  [GCC 11.2.0] (64-bit runtime)
Python platform: Linux-5.15.0-1030-ibm-x86_64-with-glibc2.17
Is CUDA available: True
CUDA runtime version: Could not collect
GPU models and configuration: GPU 0: Tesla V100-PCIE-16GB
Nvidia driver version: 520.61.05
cuDNN version: Could not collect
HIP runtime version: N/A
MIOpen runtime version: N/A
Is XNNPACK available: True

Architecture:                    x86_64
CPU op-mode(s):                  32-bit, 64-bit
Address sizes:                   40 bits physical, 48 bits virtual
Byte Order:                      Little Endian
CPU(s):                          16
On-line CPU(s) list:             0-15
Vendor ID:                       GenuineIntel
Model name:                      Intel Xeon Processor (Cascadelake)
CPU family:                      6
Model:                           85
Thread(s) per core:              2
Core(s) per socket:              8
Socket(s):                       1
Stepping:                        6
BogoMIPS:                        4988.13
Flags:                           fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology cpuid tsc_known_freq pni pclmulqdq vmx ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch cpuid_fault invpcid_single ssbd ibrs ibpb stibp ibrs_enhanced tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid avx512f avx512dq rdseed adx smap clflushopt clwb avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves arat pku ospke avx512_vnni md_clear arch_capabilities
Virtualization:                  VT-x
Hypervisor vendor:               KVM
Virtualization type:             full
L1d cache:                       512 KiB (16 instances)
L1i cache:                       512 KiB (16 instances)
L2 cache:                        32 MiB (8 instances)
L3 cache:                        16 MiB (1 instance)
NUMA node(s):                    1
NUMA node0 CPU(s):               0-15
Vulnerability Itlb multihit:     Not affected
Vulnerability L1tf:              Not affected
Vulnerability Mds:               Not affected
Vulnerability Meltdown:          Not affected
Vulnerability Mmio stale data:   Vulnerable: Clear CPU buffers attempted, no microcode; SMT Host state unknown
Vulnerability Retbleed:          Mitigation; Enhanced IBRS
Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl and seccomp
Vulnerability Spectre v1:        Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Vulnerability Spectre v2:        Mitigation; Enhanced IBRS, IBPB conditional, RSB filling, PBRSB-eIBRS SW sequence
Vulnerability Srbds:             Not affected
Vulnerability Tsx async abort:   Not affected

Versions of relevant libraries:
[pip3] numpy==1.24.3
[pip3] numpy-ext==0.9.8
[pip3] torch==2.0.1
[pip3] torchaudio==2.0.2
[pip3] torchvision==0.15.2
[pip3] triton==2.0.0
[conda] blas                      1.0                         mkl  
[conda] captum                    0.6.0                         0    pytorch
[conda] libblas                   3.9.0            12_linux64_mkl    conda-forge
[conda] libcblas                  3.9.0            12_linux64_mkl    conda-forge
[conda] mkl                       2021.4.0           h06a4308_640  
[conda] mkl-service               2.4.0            py38h7f8727e_0  
[conda] mkl_fft                   1.3.1            py38hd3c417c_0  
[conda] mkl_random                1.2.2            py38h51133e4_0  
[conda] numpy                     1.23.1                   pypi_0    pypi
[conda] numpy-base                1.24.3           py38h31eccc5_0  
[conda] numpy-ext                 0.9.8                    pypi_0    pypi
[conda] pytorch                   2.0.1           py3.8_cuda11.8_cudnn8.7.0_0    pytorch
[conda] pytorch-cuda              11.8                 h7e8668a_5    pytorch
[conda] pytorch-mutex             1.0                        cuda    pytorch
[conda] tensorflow-base           2.11.0          mkl_py38he5f8e37_0  
[conda] torchaudio                2.0.2                py38_cu118    pytorch
[conda] torchtriton               2.0.0                      py38    pytorch
[conda] torchvision               0.15.2               py38_cu118    pytorch

Which value did you set the variable to?

Hi! Thanks for the response.

Both tried :4096:8 and 8519680 (The default)

I tried it first by setting it in my bashrc (export CUBLAS_WORKSPACE_CONFIG=‘’:4096:8" or “8519680”) then since that didn’t work i tried to fix it by directly giving it in the terminal command (CUBLAS… python

It basically seems to not be able to parse the CUBLAS_WORKSPACE_CONFIG variable in general

The env variable works for me so could you post exactly how you are running the script and the error you are seeing?