nvcc: command not found

I try to compile the GPUCoder example within 2018a in ubuntu 16.04. But the compilation failed within matlab with following output:

>> codegen -config cfg -args {ones(227,227,3,'single'), coder.Constant('alexnet.mat')} alexnet_predict.m
------------------------------------------------------------------------
nvcc -ccbin /bin/aarch64-linux-gnu-g++ -rdc=true -Xcompiler -fPIC -I/include -Xcudafe "--diag_suppress=unsigned_compare_with_zero" -c -Xcompiler -MMD,-MP -O2 -arch sm_35  -DMODEL=alexnet_predict -DHAVESTDIO -DUSE_RTMODEL -DUNIX -I/home/ibmfuchs/gpucoderdemo_jetson_tx22/codegen/lib/alexnet_predict -I/home/ibmfuchs/gpucoderdemo_jetson_tx22 -I/home/ibmfuchs/Programs/Matlab/2018a/extern/include -I/home/ibmfuchs/Programs/Matlab/2018a/simulink/include -I/home/ibmfuchs/Programs/Matlab/2018a/rtw/c/src -I/home/ibmfuchs/Programs/Matlab/2018a/rtw/c/src/ext_mode/common -I/home/ibmfuchs/Programs/Matlab/2018a/rtw/c/ert -Iinclude -o cnn_api.o cnn_api.cpp
/bin/sh: 1: nvcc: not found
gmake: *** [cnn_api.o] Error 127

Error(s) encountered while building "alexnet_predict":
### Failed to generate all binary outputs.
------------------------------------------------------------------------
??? Build error: C++ compiler produced errors. See the Build Log for further details.

Code generation failed: View Error Report
Error using codegen

calling nvcc from workspace I got:

>> system('nvcc')
/bin/bash: nvcc: command not found

ans =

     127

But in terminal I have no problem to call nvcc:

ibmfuchs@SUbuntu:/$ nvcc
nvcc fatal   : No input files specified; use option --help for more information

Can anyone please help? Thanks

Answer 1

[Walter Roberson]

nvcc is not on your PATH environment variable when you are in MATLAB. When you start MATLAB by way of icon, it does not go through login and so your shell configuration files are not executed to do any customization of environment variables for you.

You should use setenv() within MATLAB to add the directory that nvcc is in to PATH, or else you should alter your system PATH environment variable to include the proper directory, or else you should put a symbolic link from one of the directories that is on the system default PATH to the actual location of nvcc

Example:

p = getenv('PATH');
setenv('PATH', [p ':/usr/local/bin'])

[Song Decn]

thanks. it works. but I get another error:

codegen -config cfg -args {ones(227,227,3,'single'), coder.Constant('alexnet.mat')} alexnet_predict.m
------------------------------------------------------------------------
nvcc -ccbin /bin/aarch64-linux-gnu-g++ -rdc=true -Xcompiler -fPIC -I/include -Xcudafe "--diag_suppress=unsigned_compare_with_zero" -c -Xcompiler -MMD,-MP -O2 -arch sm_35  -DMODEL=alexnet_predict -DHAVESTDIO -DUSE_RTMODEL -DUNIX -I/home/ibmfuchs/gpucoderdemo_jetson_tx22/codegen/lib/alexnet_predict -I/home/ibmfuchs/gpucoderdemo_jetson_tx22 -I/home/ibmfuchs/Programs/Matlab/2018a/extern/include -I/home/ibmfuchs/Programs/Matlab/2018a/simulink/include -I/home/ibmfuchs/Programs/Matlab/2018a/rtw/c/src -I/home/ibmfuchs/Programs/Matlab/2018a/rtw/c/src/ext_mode/common -I/home/ibmfuchs/Programs/Matlab/2018a/rtw/c/ert -Iinclude -o cnn_api.o cnn_api.cpp
/bin/aarch64-linux-gnu-g++: No such file or directory
gmake: *** [cnn_api.o] Error 1

Error(s) encountered while building "alexnet_predict":
### Failed to generate all binary outputs.
------------------------------------------------------------------------
??? Build error: C++ compiler produced errors. See the Build Log for further details.

[Song Decn]

btw, I've installed aarch64-linux-gnu-g++ properly

[Song Decn]

it turns out that on my machine aarch64-linux-gnu-g++ is installed under: /usr/bin instead of /bin.

Do you know how to fix this?

[Walter Roberson]

After -ccbin you have to name either the directory your compiler is in, or else the full path to your compiler including executable name. It appears that your compiler is not in the location you named.

[Song Decn]

Hi Walter, thanks for your help. I used whole day and managed finally to compile the GPU Tx2 example in Matlab. Now all the files can be compiled and I get an excutable alextnet_exe. But after I try to run it via "./alexnet_exe 1", I get an error "Permission denied"

Is or was there something wrong?

Thnks

[Walter Roberson]

chmod +x ./alexnet_exe

[Song Decn]

Thank Walter. Again I am step further, now I get another error

nvidia@tegra-ubuntu:~/Documents/Work/alexnet_predict$ ./alexnet_exe 1
Could not open the video capture device.

How can i find out the device number for my camera?

[Walter Roberson]

lshw maybe?

https://www.tecmint.com/commands-to-collect-system-and-hardware-information-in-linux/

[Song Decn]

i tried all the commands from your referenced site but i cant figure out. also the on board camera is working fine. ：(

[Walter Roberson]

Sorry, I am not a linux specialist.

http://hintshop.ludvig.co.nz/show/persistent-names-usb-serial-devices/

[Hannah Nithilla]

how exactly did you use this solution in your code?

p = getenv('PATH');
setenv('PATH', [p ':/usr/local/bin'])

because i still get nvcc not found.