MP_CHILD

[Lewis Flanagan]

Hey,

When I try running something with C++ backend, I get the following error message:

"0: xlupc transport: missing environment variable: MP_CHILD"

What am I doing wrong?

Java backend works fine.

[Martha Kim]

Hi Lewis,

There's not much to go on here.  We need more info to help you debug.  Please include the code you're running (or better yet a small program that exhibits the same behavior), the compile command you're using (or Makefile), the command you're running when you see this error, and the environment?

Thanks,
Martha

[Lewis Flanagan]

Yay, I should have given you way more information. I'd just gotten up when I wrote that so my brain probably wasn't on all the way.

This is on the three musketeers cluster. I'm using x10c++ to compile. That works fine. 

I get the same error message for every program I run, so a simple "hello world" program will do fine.

To run I type 

                       ./a.out

I've also tried

                       srun ./a.out

I assume there is something very basic I'm doing wrong. I've looked through http://docs.codehaus.org/display/XTENLANG/X10+Application+Development and didn't see any thing helpful, though there is a lot in there I don't understand. My background in command line and unix is fairly limited. 

[Martha Kim]

Hi Lewis,

You are probably failling to link with some necessary libraries when you compile.  Try using the commands from this makefile.  The page you linked to describes what the -n and -N flags do for srun.

Let us know if you continue to have trouble.

Martha

APP=YourProgramHere

X10_PATH=~vj/x1021/trunk/x10.dist/bin/

all: run

.SUFFIXES: .x10 .mpi

.x10.mpi:

$(X10_PATH)/x10c++ -t -v -report postcompile=1 -o $@ -x10rt mpi -post "# # -lpmi #" -optimize $<

run: ./$(APP).mpi

srun -N2 -n2 $<

clean:

rm -fr *.mpi *.sock *.cc *.h *.inc

[Lewis Flanagan]

Ok, I'm still having trouble getting this to run. I'm camped out in the computer science area common room so if you have a free minute, let me know.