HP-MPI Version 2.2.5 for HP-UX Release Note

Table Of Contents

HP-MPI V2.2.5 for HP-UX Release Note

Known Problems and Workarounds

• Problem with CPU binding and appfiles that launch scripts on HP-UX

HP-UX shells do not get bound because they are chatr'd to ignore LD_LIBRARY_PATH. This

causes problems with binding when a shell is involved in the MPI program that is started

first.

In order to get proper CPU binding on HP-UX, insert a wrapper (mpipreexec) before the

program in the appfile or command line. For example, instead of

-np 128 /path/to/some/script arg1 arg2 arg3

use

-np 128 /path/to/mpipreexec /path/to/some/script arg1 arg2 arg3

mpipreexec executes the program along with the arguments it is passed and propagates

the environment. It is not chatr'd to ignore LD_LIBRARY_PATH.

The source for mpipreexec.c:

#include <errno.h>

#include <unistd.h>

#include <stdio.h>

int main(int argc,char *argv[])

{

if(argc <2)

return 1;

execvp(argv[1],&(argv[1]));

fprintf(stderr,"Error, unable to exec cmdline (%s),error=%d.\n",argv[1],errno);

return 0;

}

• InfiniBand driver B.11.23.06 has a known issue that can lead to data corruption if

HP-MPI is used with the -srq option. The bug does not occur if -srq is not used, and older

versions of the InfiniBand driver do not have this problem. Newer versions of the

InfiniBand driver will also contain the fix.

• If your system contains multiple versions of system utilites such as 'ar', be sure that

/usr/bin comes earlier in your PATH so the HP-UX version of the utility will be used. If

'which ar' gives some other version of 'ar' such as the 'ar' from a GNU tools package, then

the Makefile which is used to build your own copy of libmpiCC.a may produce an invalid

link command.