HP-MPI V2.3 for Linux Release Note

• Interval timer functionality used by HP-MPI on HP XC systems can conflict with

gprof data collection phase requirements. Set the following two environment

variables to workaround this issue:

% export MPI_FLAGS=s0

% export GMON_OUT_PREFIX=/tmp/app_name

In the above example, setting MPI_FLAGS disables the HP-MPI conflicting use of

interval timers. See the mpienv(1) manpage for descriptions of MPI_FLAG settings.

Because this setting also disables message progression monitoring, use it with

well-behaved programs only.

In the above example, the second setting causes gprof data collection files to be

named /tmp/app_name.PID (where PID is the process ID number). The prefix

is set arbitrarily and makes the file unique in cases where the same PID is given

on different nodes.

• The HP-MPI V2.3 library for Linux contains a dependency which requires

libpthread. The mpicc, mpif90, etc. compiler wrapper scripts automatically

add the necessary -lpthread, but manually linked applications must explicitly

add -lpthread.

• Profiling routines built for C calls do not cause the corresponding Fortran calls to

be wrapped automatically. To profile Fortran routines, separate wrappers need

to be written for the Fortran calls.

• HP-MPI complies with the MPI-1.2 standard, which defines bindings for Fortran

77 and C, but not Fortran 90 or C++. HP-MPI also complies with the C++ binding

definitions detailed in the MPI-2 standard. However, the C++ bindings are not

thread safe and should not be used with the HP-MPI threaded libraries (for

example, libmtmpi). HP-MPI does not provide bindings for Fortran 90. Some

features of Fortran 90 might interact with MPI non-blocking semantics to produce

unexpected results. Consult the HP-MPI User’s Guide for details.

• When using the HP Caliper profiling tool with HP-MPI applications, it might be

necessary to specify the following environment variable setting in order to avoid

an application abort.

% setenv HPMPI_NOPROPAGATE_SUSP 1

$ export HPMPI_NOPROPAGATE_SUSP=1

• To use the -tv option to mpirun, the TotalView binary must be in the user’s PATH,

or the TOTALVIEW environment variable must be set to the full path of the

TotalView binary.

% export TOTALVIEW=/usr/toolworks/totalview/bin/totalview

• Extended collectives with intercommunicators are not profiled by the HP-MPI

lightweight instrumentation mode.