[mpich-discuss] MPI Window limit on mpich
Marvin Smith
Marvin.Smith at sncorp.com
Mon Sep 19 12:49:51 CDT 2016
Good morning,
I wanted to present an issue I am having with MPICH and validate
whether this is a configuration problem, a limitation with MPICH, or a
bug.
I am writing an application which uses a large number of MPI windows, each
window is given a relatively large amount of memory. This has never been
a problem before, however we discovered if you allocate more than 2045
windows, you get an exception thrown.
Notes:
I am compiling using g++, version 4.8.5 on Red Hat Enterprise Linux
version 7.2.
My MPICH version is listed at the bottom of this email. It was installed
via yum and is the RHEL default.
I have attached sample output, to include the stdout/stderr. Also
included is a Makefile and a simple example.
The boundary of failure is between 2045 and 2046 windows.
I have verified on my system this problem repeats even if I distribute
windows between multiple communicators.
I have not tested yet against ompi or mvapich.
#-----------------------------------------------------------------------------------------------#
#- Here is my output -#
#-----------------------------------------------------------------------------------------------#
mpirun -np 2 -hosts localhost ./mpi-win-test 2046 1
Initialized Rank: 0, Number Processors: 2, Hostname: test-machine
Initialized Rank: 1, Number Processors: 2, Hostname: test-machine
Fatal error in MPI_Win_create_dynamic: Other MPI error, error stack:
MPI_Win_create_dynamic(154)..........:
MPI_Win_create_dynamic(MPI_INFO_NULL, MPI_COMM_WORLD, win=0x10c1464)
failed
MPID_Win_create_dynamic(139).........:
win_init(254)........................:
MPIR_Comm_dup_impl(55)...............:
MPIR_Comm_copy(1552).................:
MPIR_Get_contextid(799)..............:
MPIR_Get_contextid_sparse_group(1146): Cannot allocate context ID because
of fragmentation (0/2048 free on this process; ignore_id=0)
Fatal error in MPI_Win_create_dynamic: Other MPI error, error stack:
MPI_Win_create_dynamic(154)..........:
MPI_Win_create_dynamic(MPI_INFO_NULL, MPI_COMM_WORLD, win=0x19ef444)
failed
MPID_Win_create_dynamic(139).........:
win_init(254)........................:
MPIR_Comm_dup_impl(55)...............:
MPIR_Comm_copy(1552).................:
MPIR_Get_contextid(799)..............:
MPIR_Get_contextid_sparse_group(1146): Cannot allocate context ID because
of fragmentation (0/2048 free on this process; ignore_id=0)
===================================================================================
= BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES
= EXIT CODE: 1
= CLEANING UP REMAINING PROCESSES
= YOU CAN IGNORE THE BELOW CLEANUP MESSAGES
===================================================================================
make: *** [run] Error 1
#------------------------------------------------------------------------------------------#
#- Here is my Sample Makefile -#
#------------------------------------------------------------------------------------------#
# Path to mpich on RHEL7
MPI_INCL=-I/usr/include/mpich-x86_64
MPI_LIBS=-L/usr/lib64/mpich/lib -lmpich
# C++11 Bindings (Being lazy with string)
CXX_ARGS=-std=c++11
# Make th test
all: mpi-win-test
mpi-win-test: mpi-win-test.cpp
g++ $< -o $@ $(MPI_INCL) $(MPI_LIBS) $(CXX_ARGS)
# Args for application
NUM_WINDOWS=2046
USE_DYNAMIC=1
# Sample run usage
#
# Args:
# - Number of Windows
# - Type of windows (1 dynamic, 0 static)
run:
mpirun -np 2 -hosts localhost ./mpi-win-test $(NUM_WINDOWS)
$(USE_DYNAMIC)
#------------------------------------------------------------------------------------------#
#- Here is my Sample Application -#
#------------------------------------------------------------------------------------------#
#include <mpi.h>
#include <iostream>
#include <string>
#include <vector>
using namespace std;
int main( int argc, char* argv[] )
{
// Number of MPI Windows
int num_windows = std::stoi(argv[1]);
bool use_dynamic = std::stoi(argv[2]);
// Initialize MPI
MPI_Init( &argc, &argv );
// Get the rank and size
int rank, nprocs;
MPI_Comm_size( MPI_COMM_WORLD, &nprocs );
MPI_Comm_rank( MPI_COMM_WORLD, &rank );
// Get the processor name
char hostname[MPI_MAX_PROCESSOR_NAME];
int hostname_len;
MPI_Get_processor_name( hostname, &hostname_len);
// Print Message
for( int i=0; i<nprocs; i++ ){
MPI_Barrier(MPI_COMM_WORLD);
if( i == rank ){
std::cout << "Initialized Rank: " << rank << ", Number
Processors: " << nprocs << ", Hostname: " << hostname << std::endl;
}
}
// MPI Variables
vector<MPI_Aint> sdisp_remotes(num_windows);
vector<MPI_Aint> sdisp_locals(num_windows);
// Create MPI Windows
vector<MPI_Win> windows(num_windows);
int64_t buffer_size = 1000;
char* buffer = new char[buffer_size];
for( int i=0; i<num_windows; i++ )
{
if( use_dynamic )
{
MPI_Win_create_dynamic( MPI_INFO_NULL, MPI_COMM_WORLD,
&windows[i] );
}
else
{
MPI_Win_create( &buffer,
buffer_size,
1,
MPI_INFO_NULL,
MPI_COMM_WORLD,
&windows[i] );
}
}
// Exception always occurs prior to reaching this point.
// More Code Here that I am removing for brevity
// Wait at the barrier
MPI_Barrier( MPI_COMM_WORLD );
// Remove all windows
for( int i=0; i<num_windows; i++)
{
// Destroy the MPI Window
MPI_Win_free( &windows[i] );
}
windows.clear();
// Clear buffer
delete [] buffer;
buffer = nullptr;
// Close MPI
MPI_Finalize();
return 0;
}
#--------------------------------------------------------------------------#
#- MPICH Version Output -#
#--------------------------------------------------------------------------#
MPICH Version: 3.0.4
MPICH Release date: Wed Apr 24 10:08:10 CDT 2013
MPICH Device: ch3:nemesis
MPICH configure: --build=x86_64-redhat-linux-gnu
--host=x86_64-redhat-linux-gnu --program-prefix=
--disable-dependency-tracking --prefix=/usr --exec-prefix=/usr
--bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc
--datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64
--libexecdir=/usr/libexec --localstatedir=/var --sharedstatedir=/var/lib
--mandir=/usr/share/man --infodir=/usr/share/info --enable-sharedlibs=gcc
--enable-shared --enable-lib-depend --disable-rpath --enable-fc
--with-device=ch3:nemesis --with-pm=hydra:gforker
--sysconfdir=/etc/mpich-x86_64 --includedir=/usr/include/mpich-x86_64
--bindir=/usr/lib64/mpich/bin --libdir=/usr/lib64/mpich/lib
--datadir=/usr/share/mpich --mandir=/usr/share/man/mpich
--docdir=/usr/share/mpich/doc --htmldir=/usr/share/mpich/doc
--with-hwloc-prefix=system FC=gfortran F77=gfortran CFLAGS=-m64 -O2 -g
-pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong
--param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -fPIC
CXXFLAGS=-m64 -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions
-fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches
-m64 -mtune=generic -fPIC FCFLAGS=-m64 -O2 -g -pipe -Wall
-Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong
--param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -fPIC
FFLAGS=-m64 -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions
-fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches
-m64 -mtune=generic -fPIC LDFLAGS=-Wl,-z,noexecstack MPICH2LIB_CFLAGS=-O2
-g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions
-fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches
-m64 -mtune=generic MPICH2LIB_CXXFLAGS=-O2 -g -pipe -Wall
-Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong
--param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic
MPICH2LIB_FCFLAGS=-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions
-fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches
-m64 -mtune=generic MPICH2LIB_FFLAGS=-O2 -g -pipe -Wall
-Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong
--param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic
MPICH CC: cc -m64 -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2
-fexceptions -fstack-protector-strong --param=ssp-buffer-size=4
-grecord-gcc-switches -m64 -mtune=generic -fPIC -O2
MPICH CXX: c++ -m64 -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2
-fexceptions -fstack-protector-strong --param=ssp-buffer-size=4
-grecord-gcc-switches -m64 -mtune=generic -fPIC -O2
MPICH F77: gfortran -m64 -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2
-fexceptions -fstack-protector-strong --param=ssp-buffer-size=4
-grecord-gcc-switches -m64 -mtune=generic -fPIC -O2
MPICH FC: gfortran -m64 -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2
-fexceptions -fstack-protector-strong --param=ssp-buffer-size=4
-grecord-gcc-switches -m64 -mtune=generic -fPIC -O2
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