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Posted to issues@mxnet.apache.org by GitBox <gi...@apache.org> on 2020/11/23 13:13:00 UTC
[GitHub] [incubator-mxnet] m-ky opened a new issue #19579: mxnet_75.dll chosen, even if there is newer mxnet_86.dll present
m-ky opened a new issue #19579:
URL: https://github.com/apache/incubator-mxnet/issues/19579
## Description
MXNet 1.8.0.rc2, Windows 10, Cuda 11, NVIDIA RTX 3090, C++ build from source
After build there are several mxnet_XY.dll, where X is cuda major and Y minor version. For RTX 3090 mxnet_86.dll should be used.
However this dll is not chosen, instead it tries to select mxnet_75.dll.
This causes:
1. Either mxnet_75.dll is there, which causes PTX compilation to start, if mxnet_75.dll contains PTX code (even if there is mxnet_86.dll that can be used right away).
2. Or mxnet_75.dll is not there, which crashes program on first use of any mxnet function (nullpointer).
### Error Message
Either unnecessarily builds PTX code (if it is present), or crashes on nullpointer exception when mxnet_75.dll is not present.
## To Reproduce
Build C++ package from source on Windows using Cuda 11.
MXNET_CUDA_ARCH can be auto (on RTX 3090 this means sm86), or all.
The use any mxnet function from C++.
## What have you tried to solve it?
In file tools/windowsbuild/warp_dll.cpp, there is function find_version() that should return which mxnet sm version should be used.
Third line in that function should be changed to:
int version = 86;
## Environment
MXNet 1.8.0.rc2, Windows 10, Cuda 11, NVIDIA RTX 3090, C++ build from source
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[GitHub] [incubator-mxnet] m-ky commented on issue #19579: mxnet_75.dll chosen, even if there is newer mxnet_86.dll present
Posted by GitBox <gi...@apache.org>.
m-ky commented on issue #19579:
URL: https://github.com/apache/incubator-mxnet/issues/19579#issuecomment-733696139
After some looking I found that it is already fixed in master:
https://github.com/apache/incubator-mxnet/pull/19410
I will ask to merge this fix to 1.8.0
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[GitHub] [incubator-mxnet] leezu commented on issue #19579: mxnet_75.dll chosen, even if there is newer mxnet_86.dll present
Posted by GitBox <gi...@apache.org>.
leezu commented on issue #19579:
URL: https://github.com/apache/incubator-mxnet/issues/19579#issuecomment-733163139
Ok, great! Would you open a PR with the fix?
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[GitHub] [incubator-mxnet] leezu commented on issue #19579: mxnet_75.dll chosen, even if there is newer mxnet_86.dll present
Posted by GitBox <gi...@apache.org>.
leezu commented on issue #19579:
URL: https://github.com/apache/incubator-mxnet/issues/19579#issuecomment-732348252
> C++ build from source
If you're only interested in running on a single GPU architecture, you can just set `USE_SPLIT_ARCH_DLL=0`
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[GitHub] [incubator-mxnet] m-ky commented on issue #19579: mxnet_75.dll chosen, even if there is newer mxnet_86.dll present
Posted by GitBox <gi...@apache.org>.
m-ky commented on issue #19579:
URL: https://github.com/apache/incubator-mxnet/issues/19579#issuecomment-733015247
Thank you for response.
I actually use multiple GPU architectures and need the splitting functionality.
My fix seems to work fine, I just wanted to let people know that there is bug.
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[GitHub] [incubator-mxnet] m-ky closed issue #19579: mxnet_75.dll chosen, even if there is newer mxnet_86.dll present
Posted by GitBox <gi...@apache.org>.
m-ky closed issue #19579:
URL: https://github.com/apache/incubator-mxnet/issues/19579
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