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Subject: Re: [OMPI users] A problem with running a 32-bit program on a 64-bit machine
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2011-01-22 11:12:11

Thanks for that info!

I was literally just digging into this myself; I am able to replicate the problem on a 1.5.1 tarball, but not on a nightly 1.5.2 snapshot tarball. Would you mind trying to replicate the issue on a recent 1.5.2 snapshot?

On Jan 22, 2011, at 10:58 AM, Avinash wrote:

> Hello,
> I figured out the problem, which is described herein, it might be useful for someone else. The problem stems from ompi_local_slave option being set on its own in the MPI_Info structure. It seems that MPI_Info_create is using a shift or more likely a masking operation (depending upon the size of some type, which in turn depends upon the underlying architecture), which sets the ompi_local_slave bit to high. As a result, "jdata->controls" has it's ORTE_JOB_CONTROL_LOCAL_SLAVE bit set high, see plm_rsh_module.c (line 1065) for the problem. I took the easy solution and set the ompi_local_slave to "no" in the Info structure and that solves the problem. Maybe this needs further investigation.
> Regards,
> On 1/21/11 7:22 PM, Avinash Malik wrote:
>> Hello,
>> I have compiled openmpi-1.5.1 as a 32-bit binary on a 64-bit
>> architecture. I have a problem using MPI_Comm_spawn and
>> MPI_Comm_spawn_multiple, when MPI_Info is used as a non NULL
>> (MPI_INFO_NULL) parameter. I get a segmentation fault. I have
>> the exact same code running fine on a 32-bit machine. I cannot
>> use the 64-bit openmpi due to problems with other software,
>> which uses openmpi, but can only be compiled in the 32-bit mode.
>> I am attaching all the information, in a .tgz file. The .tgz
>> file consists of:
>> (1) The c-code for a small example two files parent.c and
>> child.c
>> (2) The compile_command that I ran on a 64-bit machine.
>> (3) The run command to run the system
>> compiling openmpi-1.5.1.
>> (4) ompi_info_all
>> (5) The error that I get, it's a segmentation fault.
>> Regards,
>> _______________________________________________
>> users mailing list
>> users_at_[hidden]
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Jeff Squyres
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