javajarcudajcuda

Exception in thread "main" java.lang.NoClassDefFoundError: jcuda/driver/JCudaDriver

I am trying to set up JCuda and execute a Sample addition kernel. When I try to execute JCudaVectorAdd after compiling JCudaVectorAdd.java, I am getting the following error:

Exception in thread "main" java.lang.NoClassDefFoundError: jcuda/driver/JCudaDriver
        at JCudaVectorAdd.main(JCudaVectorAdd.java:38)
Caused by: java.lang.ClassNotFoundException: jcuda.driver.JCudaDriver
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 1 more

I have created a bash file with the steps I have performed to get to where I am:

#!/bin/bash

# This system has multiple Cuda instances, so we need to load the correct one
module load cuda-9.2

# Try to remove any jcuda zip files that may have been created previously
rm $HOME/jcuda.zip

# Get jcuda zip file from online, storing into $HOME directory
wget http://www.jcuda.org/downloads/JCuda-All-0.9.2.zip -O $HOME/jcuda.zip

# Remove the 0.9.2 directory in case it exists to get ready for a clean install
rm -rf $HOME/jcuda/JCuda-All-0.9.2

# Unzip the file and store within jcuda directory. NOTE: The version number will be maintained as jcuda/JCuda-ALL-0.9.2.zip, so multiple versions of jcuda can be installed using this script
unzip $HOME/jcuda.zip -d $HOME/jcuda

# Remove the zipped file now that it is no longer needed
rm $HOME/jcuda.zip

# Move into the newly create jcuda directory
cd $HOME/jcuda/JCuda-All-0.9.2/

# Get the example Main program for Vector addition from Jcuda site
wget http://www.jcuda.org/samples/JCudaVectorAdd.java

# Create a sample kernel
echo 'extern "C"'                                                   >  JCudaVectorAddKernel.cu
echo '__global__ void add(int n, float *a, float *b, float *sum)'   >> JCudaVectorAddKernel.cu
echo '{'                                                            >> JCudaVectorAddKernel.cu
echo '    int i = blockIdx.x * blockDim.x + threadIdx.x;'           >> JCudaVectorAddKernel.cu
echo '    if (i<n)'                                                 >> JCudaVectorAddKernel.cu
echo '    {'                                                        >> JCudaVectorAddKernel.cu
echo '        sum[i] = a[i] + b[i];'                                >> JCudaVectorAddKernel.cu
echo '    }'                                                        >> JCudaVectorAddKernel.cu
echo '}'                                                            >> JCudaVectorAddKernel.cu

# Create a .ptx file from the cuda kernel to be consumed by the Main java program later
# The sample Main program also performs this action, but we have it here as well
nvcc -ptx JCudaVectorAddKernel.cu -o JCudaVectorAddKernel.ptx

# Try to generate a class file from the example Main .java file
javac -cp ".:jcuda-0.9.2.jar:jcuda-natives-0.9.2-linux-x86_64.jar" JCudaVectorAdd.java

# Run the compiled executable
java JCudaVectorAdd

It appears that I am missing a step somewhere, although I am not familiar enough with java or cuda/jcuda to identify what I am missing. Can anyone point me in the direction of how to resolve this issue, whether it be additional steps are modifying the steps I have performed?

EDIT: It appears that I still need to reference the other .jar files in my execution (like they do in http://www.jcuda.org/tutorial/TutorialIndex.html basic test), so my last command may have been wrong. Changing it to the following has shown slightly different results:

java JCudaVectorAdd -> java -cp ".:jcuda-0.9.2.jar:jcuda-natives-0.9.2-linux-x86_64.jar" JCudaVectorAdd

Exception in thread "main" java.lang.UnsatisfiedLinkError: Error while loading native library "JCudaDriver-0.9.2-linux-x86_64"
Operating system name: Linux
Architecture         : amd64
Architecture bit size: 64
---(start of nested stack traces)---
Stack trace from the attempt to load the library as a file:
java.lang.UnsatisfiedLinkError: no JCudaDriver-0.9.2-linux-x86_64 in java.library.path
        at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1867)
        at java.lang.Runtime.loadLibrary0(Runtime.java:870)
        at java.lang.System.loadLibrary(System.java:1122)
        at jcuda.LibUtils.loadLibrary(LibUtils.java:143)
        at jcuda.driver.JCudaDriver.<clinit>(JCudaDriver.java:296)
        at JCudaVectorAdd.main(JCudaVectorAdd.java:38)
Stack trace from the attempt to load the library as a resource:
java.lang.UnsatisfiedLinkError: /tmp/libJCudaDriver-0.9.2-linux-x86_64.so: libcuda.so.1: cannot open shared object file: No such file or directory
        at java.lang.ClassLoader$NativeLibrary.load(Native Method)
        at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1941)
        at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1824)
        at java.lang.Runtime.load0(Runtime.java:809)
        at java.lang.System.load(System.java:1086)
        at jcuda.LibUtils.loadLibraryResource(LibUtils.java:260)
        at jcuda.LibUtils.loadLibrary(LibUtils.java:158)
        at jcuda.driver.JCudaDriver.<clinit>(JCudaDriver.java:296)
        at JCudaVectorAdd.main(JCudaVectorAdd.java:38)
---(end of nested stack traces)---

        at jcuda.LibUtils.loadLibrary(LibUtils.java:193)
        at jcuda.driver.JCudaDriver.<clinit>(JCudaDriver.java:296)
        at JCudaVectorAdd.main(JCudaVectorAdd.java:38)
Solution

  • It seems you need to tell the JRE where to find the corresponding OS library to run cuda. If you look at the output, it's stating it cannot find libcuda.so.1.

    Find where in your filesystem these libraries are, and set your java.library.path property to point there. java -Djava.library.path=/path/to/cudalibdir/ <rest of commandline>

    If your system does not have the library, you might need to install it or compile it locally.

    Disclaimer: I do not have experience with cuda specifically but have worked with other jars that require OS level libraries to function.