# Can't run DL4J with GPU on Linux **URL:** \ **Category:** DL4J\ **Created:** [July 12, 2021, 5:15am UTC](https://community.konduit.ai/t/cant-run-dl4j-with-gpu-on-linux/1491 "2021-07-12T05:15:22Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![joel-a](https://yyz1.discourse-cdn.com/flex035/user_avatar/community.konduit.ai/joel-a/32/576_2.png) [@joel-a](https://community.konduit.ai/u/joel-a)\ **Post date:** [July 12, 2021, 5:15am UTC](https://community.konduit.ai/t/cant-run-dl4j-with-gpu-on-linux/1491/1 "2021-07-12T05:15:23Z")
I’m building my application on Windows with dependencies: nd4j-cuda-11.2-platform and deeplearning4j-cuda-11.2. I’m creating an executable uber jar as a result and trying to run it on a different OS (Linux). I get the following error: Warning: Could not load Loader: java.lang.UnsatisfiedLinkError: java.io.IOException: Function not implemented java.io.IOException: Function not implemented at sun.nio.ch.FileDispatcherImpl.lock0(Native Method) at sun.nio.ch.FileDispatcherImpl.lock(FileDispatcherImpl.java:94) at sun.nio.ch.FileChannelImpl.lock(FileChannelImpl.java:1072) at java.nio.channels.FileChannel.lock(FileChannel.java:1053) at org.bytedeco.javacpp.Loader.cacheResource(Loader.java:647) at org.bytedeco.javacpp.Loader.loadLibrary(Loader.java:1582) at org.bytedeco.javacpp.Loader.load(Loader.java:1328) at org.bytedeco.javacpp.Loader.load(Loader.java:1132) at org.bytedeco.cuda.global.cudart.(cudart.java:14) at org.nd4j.linalg.jcublas.JCublasBackend.canRun(JCublasBackend.java:67) at org.nd4j.linalg.jcublas.JCublasBackend.isAvailable(JCublasBackend.java:52) at org.nd4j.linalg.factory.Nd4jBackend.load(Nd4jBackend.java:160) at org.nd4j.linalg.factory.Nd4j.initContext(Nd4j.java:5092) at org.nd4j.linalg.factory.Nd4j.(Nd4j.java:270) at org.deeplearning4j.util.ModelSerializer.restoreComputationGraphHelper(ModelSerializer.java:506) at org.deeplearning4j.util.ModelSerializer.restoreComputationGraph(ModelSerializer.java:462) at org.deeplearning4j.util.ModelSerializer.restoreComputationGraph(ModelSerializer.java:647) at org.deeplearning4j.nn.graph.ComputationGraph.load(ComputationGraph.java:4618) at edu.mit.ll.seamnet.DL4JEnhancementDNN.(DL4JEnhancementDNN.java:54) at edu.mit.ll.seamnet.EnhancementDNNFactory.newInstance(EnhancementDNNFactory.java:29) at edu.mit.ll.seamnet.SpeechEnhancement.(SpeechEnhancement.java:46) at edu.mit.ll.seamnet.SpeechEnhancement.(SpeechEnhancement.java:52) at edu.mit.ll.seamnet.SpeechEnhancement.main(SpeechEnhancement.java:268) Exception in thread “main” java.lang.ExceptionInInitializerError at org.deeplearning4j.util.ModelSerializer.restoreComputationGraphHelper(ModelSerializer.java:506) at org.deeplearning4j.util.ModelSerializer.restoreComputationGraph(ModelSerializer.java:462) at org.deeplearning4j.util.ModelSerializer.restoreComputationGraph(ModelSerializer.java:647) at org.deeplearning4j.nn.graph.ComputationGraph.load(ComputationGraph.java:4618) at edu.mit.ll.seamnet.DL4JEnhancementDNN.(DL4JEnhancementDNN.java:54) at edu.mit.ll.seamnet.EnhancementDNNFactory.newInstance(EnhancementDNNFactory.java:29) at edu.mit.ll.seamnet.SpeechEnhancement.(SpeechEnhancement.java:46) at edu.mit.ll.seamnet.SpeechEnhancement.(SpeechEnhancement.java:52) at edu.mit.ll.seamnet.SpeechEnhancement.main(SpeechEnhancement.java:268) Caused by: java.lang.RuntimeException: org.nd4j.linalg.factory.Nd4jBackend$NoAvailableBackendException: Please ensure that you have an nd4j backend on your classpath. Please see: [https://deeplearning4j.konduit.ai/nd4j/backend](https://deeplearning4j.konduit.ai/nd4j/backend) at org.nd4j.linalg.factory.Nd4j.initContext(Nd4j.java:5095) at org.nd4j.linalg.factory.Nd4j.(Nd4j.java:270) … 9 more Caused by: org.nd4j.linalg.factory.Nd4jBackend$NoAvailableBackendException: Please ensure that you have an nd4j backend on your classpath. Please see: [https://deeplearning4j.konduit.ai/nd4j/backend](https://deeplearning4j.konduit.ai/nd4j/backend) at org.nd4j.linalg.factory.Nd4jBackend.load(Nd4jBackend.java:196) at org.nd4j.linalg.factory.Nd4j.initContext(Nd4j.java:5092) I tried everything in [https://deeplearning4j.konduit.ai/config/backends](https://deeplearning4j.konduit.ai/config/backends) and nothing seems to help. Any thoughts as to why I’m getting this error? Any help will be greatly appreciated as we are trying to finalize our project. Thank you! ---
**Author:** ![treo](https://yyz1.discourse-cdn.com/flex035/user_avatar/community.konduit.ai/treo/32/47_2.png) [@treo](https://community.konduit.ai/u/treo)\ **Post date:** [July 12, 2021, 5:54am UTC](https://community.konduit.ai/t/cant-run-dl4j-with-gpu-on-linux/1491/2 "2021-07-12T05:54:38Z")
> [@joel-a](#): > > java.io.IOException: Function not implemented This is quite an uncommon thing to see. Can you tell us more about the environment? What linux distribution is this? What is the Kernel version? What is the filesystem of the user’s home folder? Have you set any JavaCPP options? ---
**Author:** ![joel-a](https://yyz1.discourse-cdn.com/flex035/user_avatar/community.konduit.ai/joel-a/32/576_2.png) [@joel-a](https://community.konduit.ai/u/joel-a)\ **Post date:** [July 12, 2021, 2:58pm UTC](https://community.konduit.ai/t/cant-run-dl4j-with-gpu-on-linux/1491/3 "2021-07-12T14:58:37Z")
From output of command hostnamectl: Operating System: GridOS 18.04.5 Kernel: Linux 4.14.235-llgrid-10ms Architecture: x86-64 I haven’t set any JavaCPP options. Thank you for your help! ---
**Author:** ![treo](https://yyz1.discourse-cdn.com/flex035/user_avatar/community.konduit.ai/treo/32/47_2.png) [@treo](https://community.konduit.ai/u/treo)\ **Post date:** [July 12, 2021, 5:38pm UTC](https://community.konduit.ai/t/cant-run-dl4j-with-gpu-on-linux/1491/4 "2021-07-12T17:38:50Z")
Can you also share the output of `df -Th`? ---
**Author:** ![treo](https://yyz1.discourse-cdn.com/flex035/user_avatar/community.konduit.ai/treo/32/47_2.png) [@treo](https://community.konduit.ai/u/treo)\ **Post date:** [July 13, 2021, 6:27am UTC](https://community.konduit.ai/t/cant-run-dl4j-with-gpu-on-linux/1491/6 "2021-07-13T06:27:07Z")
I see. Because your home folder is on lustrefs and it doesn’t quite support all typical filesystem features, you get that kind of error here. You should be able to run your application with `-Dorg.bytedeco.javacpp.cachedir=/tmp/javacpp` (or point it to wherever you’ve got both a more regular file system and enough disk space). ---
**Author:** ![joel-a](https://yyz1.discourse-cdn.com/flex035/user_avatar/community.konduit.ai/joel-a/32/576_2.png) [@joel-a](https://community.konduit.ai/u/joel-a)\ **Post date:** [July 13, 2021, 4:26pm UTC](https://community.konduit.ai/t/cant-run-dl4j-with-gpu-on-linux/1491/7 "2021-07-13T16:26:53Z")
> [@treo](#): > > -Dorg.bytedeco.javacpp.cachedir=/tmp/javacpp When running with that option I get a different error: Exception in thread “main” java.lang.ExceptionInInitializerError at org.nd4j.jita.concurrency.CudaAffinityManager.getNumberOfDevices(CudaAffinityManager.java:136) at org.nd4j.jita.constant.ConstantProtector.purgeProtector(ConstantProtector.java:60) at org.nd4j.jita.constant.ConstantProtector.(ConstantProtector.java:53) at org.nd4j.jita.constant.ConstantProtector.(ConstantProtector.java:41) at org.nd4j.jita.constant.ProtectedCudaConstantHandler.(ProtectedCudaConstantHandler.java:69) at org.nd4j.jita.constant.CudaConstantHandler.(CudaConstantHandler.java:38) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:348) at org.nd4j.common.config.ND4JClassLoading.loadClassByName(ND4JClassLoading.java:62) at org.nd4j.common.config.ND4JClassLoading.loadClassByName(ND4JClassLoading.java:56) at org.nd4j.linalg.factory.Nd4j.initWithBackend(Nd4j.java:5152) at org.nd4j.linalg.factory.Nd4j.initContext(Nd4j.java:5093) at org.nd4j.linalg.factory.Nd4j.(Nd4j.java:270) at org.deeplearning4j.util.ModelSerializer.restoreComputationGraphHelper(ModelSerializer.java:506) at org.deeplearning4j.util.ModelSerializer.restoreComputationGraph(ModelSerializer.java:462) at org.deeplearning4j.util.ModelSerializer.restoreComputationGraph(ModelSerializer.java:647) at org.deeplearning4j.nn.graph.ComputationGraph.load(ComputationGraph.java:4618) at edu.mit.ll.seamnet.DL4JEnhancementDNN.(DL4JEnhancementDNN.java:54) at edu.mit.ll.seamnet.EnhancementDNNFactory.newInstance(EnhancementDNNFactory.java:29) at edu.mit.ll.seamnet.SpeechEnhancement.(SpeechEnhancement.java:46) at edu.mit.ll.seamnet.SpeechEnhancement.(SpeechEnhancement.java:52) at edu.mit.ll.seamnet.SpeechEnhancement.main(SpeechEnhancement.java:268) Caused by: java.lang.RuntimeException: ND4J is probably missing dependencies. For more information, please refer to: [https://deeplearning4j.konduit.ai/nd4j/backend](https://deeplearning4j.konduit.ai/nd4j/backend) at org.nd4j.nativeblas.NativeOpsHolder.(NativeOpsHolder.java:116) at org.nd4j.nativeblas.NativeOpsHolder.(NativeOpsHolder.java:37) … 22 more Caused by: java.lang.UnsatisfiedLinkError: no jnind4jcuda in java.library.path at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1860) at java.lang.Runtime.loadLibrary0(Runtime.java:871) at java.lang.System.loadLibrary(System.java:1124) at org.bytedeco.javacpp.Loader.loadLibrary(Loader.java:1718) at org.bytedeco.javacpp.Loader.load(Loader.java:1328) at org.bytedeco.javacpp.Loader.load(Loader.java:1132) at org.nd4j.nativeblas.Nd4jCuda.(Nd4jCuda.java:10) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:348) at org.nd4j.common.config.ND4JClassLoading.loadClassByName(ND4JClassLoading.java:62) at org.nd4j.common.config.ND4JClassLoading.loadClassByName(ND4JClassLoading.java:56) at org.nd4j.nativeblas.NativeOpsHolder.(NativeOpsHolder.java:88) … 23 more Caused by: java.lang.UnsatisfiedLinkError: /tmp/javacpp/SeamNet-1.0-bin.jar/org/nd4j/nativeblas/linux-x86\_64/libjnind4jcuda.so: libnd4jcuda.so: 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:1934) at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1817) at java.lang.Runtime.load0(Runtime.java:810) at java.lang.System.load(System.java:1088) at org.bytedeco.javacpp.Loader.loadLibrary(Loader.java:1668) … 31 more Thoughts? ---
**Author:** ![treo](https://yyz1.discourse-cdn.com/flex035/user_avatar/community.konduit.ai/treo/32/47_2.png) [@treo](https://community.konduit.ai/u/treo)\ **Post date:** [July 13, 2021, 4:35pm UTC](https://community.konduit.ai/t/cant-run-dl4j-with-gpu-on-linux/1491/8 "2021-07-13T16:35:14Z")
Now we are getting somewhere. Does the system have cuda installed, or do you have the cuda presets packaged into your uberjar? ---
**Author:** ![joel-a](https://yyz1.discourse-cdn.com/flex035/user_avatar/community.konduit.ai/joel-a/32/576_2.png) [@joel-a](https://community.konduit.ai/u/joel-a)\ **Post date:** [July 22, 2021, 3:00pm UTC](https://community.konduit.ai/t/cant-run-dl4j-with-gpu-on-linux/1491/9 "2021-07-22T15:00:46Z")
I dug deeper once the cache directory was properly set in my system and realized there were CUDA libraries missing. I installed those and the application is now running. Thank you!