Julia: System Image File "Sys.Ji" Not Found

julia: system image file sys.ji not found

I ran into this issue after installing Julia v0.3.10 on a Windows machine and thought I'd post it in case it can help someone else.

When I ran julia.exe it gave me the error message listed above.

Problem:

I had created a system environment variable called JULIA_HOME and pointed it to the directory where Julia was installed. Then, I added %JULIA_HOME%\bin to my PATH.

Solution:

I pointed JULIA_HOME to the \bin directory under the Julia install directory. Then, I added %JULIA_HOME% to my PATH

Eclipse C++: having trouble with including a file with extension ji

jl_init_with_image

jl_init_with_image("pathtosysji", "sys.ji"); 

The path must be the abs path.

ie: /home/kostav/workspace/juli/Debug/../lib/x86_64-linux-gnu/julia/sys.ji

Julia version in Julia Studio

Julia Studio uses the julia-basic executable. There is no julia executable, per se. Rather there is julia-basic and julia-readline executables, the later of which has GNU Readline capabilities. The debug versions of the executables included debug symbols in the executable--it does not sound like you need those.

You can add processors in the REPL with addprocs (link to docs). There is no requirement to define the number of processors up front when starting the Julia process.

Loading Flux and CuArrays in Different Orders Causes Errors

So after quite a bit of hair pulling, I was able to get it working by adding export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:/usr/local/cuda/lib64 to my .bashrc file.

I believe that julia/Flux/CuArrays was just unbale to find the CUDNN Toolkit.

Compiling Julia embedded in C++ code

The example you are trying to compile is a little bit outdated. As already mentioned you need to give an exitcode to the jl_atexit_hook()
function. The linker message is about missing functions defined in libraries. To get rid of distribution details I downloaded and build the tarball. Now the example can be build using this makefile:

JULIA_DIR:=julia-0.4.2
JULIA_LIB:=$(JULIA_DIR)/usr/lib
JULIA_SRC:=$(JULIA_DIR)/src
JULIA_INC:=$(JULIA_DIR)/usr/include
CPPFLAGS:=-I$(JULIA_INC) -I$(JULIA_SRC) -I$(JULIA_SRC)/support
LDFLAGS:=-L$(JULIA_LIB)
LDLIBS=-ljulia
export LD_LIBRARY_PATH:=$(JULIA_LIB):$(JULIA_LIB)/julia

all: main

run: main
        @./main

clean:
    rm -f main

If you now type make run you will get the next error message about a wrong path the system image is searched in. As Thomas noted here the function jl_init() is creating a context that may fail in this case. We shall give the name and the path of the system image to the init function using jl_init_with_image("julia-0.4.2/usr/lib/julia", "sys.so") instead. This is an ugly hard coded path and can surely be replaced. But for getting started with this example and to get this problem known, it is enough. The corrected example is this:

#include <julia.h>
#include <stdio.h>

int main(int argc, char *argv[]) {
  /* required: setup the julia context */
  jl_init_with_image("julia-0.4.2/usr/lib/julia", "sys.so");

  /* run julia commands */
  jl_eval_string("print(sqrt(2.0))");

  /* strongly recommended: notify julia that the
     program is about to terminate. this allows
     julia time to cleanup pending write requests
     and run all finalizers
  */
  jl_atexit_hook(0);
  putchar('\n');
  return 0;
}

Running make run will now be a quite complicated way to calculate the square root of 2 :-)

Have fun.

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