Re: XCode and MPI
Re: XCode and MPI
- Subject: Re: XCode and MPI
- From: Ignaz Reicht <email@hidden>
- Date: Thu, 30 Jun 2011 09:46:11 +0200
Dear Dave,
thank you for your help!
best
iggy
2011/6/25
<email@hidden>
On Jun 25, 2011, at 7:09 AM, Ignaz Reicht wrote:
> Dear Users,
>
> Has someone experience using openMPI in XCode? When executing the MPI program using commandline, I can set parameters for the number of processes/cores:$ mpiexec -n 8 MyMPIprogram
>
> When executing this program in XCode4 I only get 1 process/core running. Anyone an Idea how to set additional parameters to the compiler in XCode or how XCode and MPI work together?
>
> Thanks
> Iggy
First, create a mpi.xcconfig file that looks like this:
CC = /usr/bin/mpic++
and then add a user-defined build setting and tell it to use that. I think I also had to tell it to use llvm-gcc-4.2 as the compiler in the normal settings otherwise it passed some new llvm flags that mpic++ didn't recognize.
To make it run, I edited the Scheme, and told it to use a custom executable and selected /usr/bin/mpirun (which shows up as orterun since mpirun is a symlink to that. On the arguments tab, I added:
-np 4
and
$(BUILT_PRODUCTS_DIR)/floydmpi
where floydmpi is the name of my executable.
Then it will run it within Xcode4 using 4 processes. The downside is if you program requires standard input, the input you type in at the Xcode console is not passed to your executable so this will only work with programs that do not require any standard input (i.e., pass everything via the command line). Because of this, I usually just use Xcode to edit and compile and then run the executable from the Terminal.
If you search the archives you'll find myself and others posting about the standard input issue and none of the suggestion people made worked so I gave up and just use the Terminal. If you figure out a solution, please post it to the list.
HTH,
Dave
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