我正在学习集群上的OpenMPI。这是我的第一个例子。我期望输出将显示来自不同节点的响应,但它们都从同一节点node062响应。我只是想知道为什么以及如何从不同的节点获得报告来显示MPI实际上是将流程分发到不同的节点?感谢致敬!在集群上测试MPI
ex1.c中
/* test of MPI */
#include "mpi.h"
#include <stdio.h>
#include <string.h>
int main(int argc, char **argv)
{
char idstr[2232]; char buff[22128];
char processor_name[MPI_MAX_PROCESSOR_NAME];
int numprocs; int myid; int i; int namelen;
MPI_Status stat;
MPI_Init(&argc,&argv);
MPI_Comm_size(MPI_COMM_WORLD,&numprocs);
MPI_Comm_rank(MPI_COMM_WORLD,&myid);
MPI_Get_processor_name(processor_name, &namelen);
if(myid == 0)
{
printf("WE have %d processors\n", numprocs);
for(i=1;i<numprocs;i++)
{
sprintf(buff, "Hello %d", i);
MPI_Send(buff, 128, MPI_CHAR, i, 0, MPI_COMM_WORLD); }
for(i=1;i<numprocs;i++)
{
MPI_Recv(buff, 128, MPI_CHAR, i, 0, MPI_COMM_WORLD, &stat);
printf("%s\n", buff);
}
}
else
{
MPI_Recv(buff, 128, MPI_CHAR, 0, 0, MPI_COMM_WORLD, &stat);
sprintf(idstr, " Processor %d at node %s ", myid, processor_name);
strcat(buff, idstr);
strcat(buff, "reporting for duty\n");
MPI_Send(buff, 128, MPI_CHAR, 0, 0, MPI_COMM_WORLD);
}
MPI_Finalize();
}
ex1.pbs
#!/bin/sh
#
#This is an example script example.sh
#
#These commands set up the Grid Environment for your job:
#PBS -N ex1
#PBS -l nodes=10:ppn=1,walltime=1:10:00
#PBS -q dque
# export OMP_NUM_THREADS=4
mpirun -np 10 /home/tim/courses/MPI/examples/ex1
编译和运行:
[[email protected] examples]$ mpicc ./ex1.c -o ex1
[[email protected] examples]$ qsub ex1.pbs
35540.mgt
[[email protected] examples]$ nano ex1.o35540
----------------------------------------
Begin PBS Prologue Sat Jan 30 21:28:03 EST 2010 1264904883
Job ID: 35540.mgt
Username: tim
Group: Brown
Nodes: node062 node063 node169 node170 node171 node172 node174 node175
node176 node177
End PBS Prologue Sat Jan 30 21:28:03 EST 2010 1264904883
----------------------------------------
WE have 10 processors
Hello 1 Processor 1 at node node062 reporting for duty
Hello 2 Processor 2 at node node062 reporting for duty
Hello 3 Processor 3 at node node062 reporting for duty
Hello 4 Processor 4 at node node062 reporting for duty
Hello 5 Processor 5 at node node062 reporting for duty
Hello 6 Processor 6 at node node062 reporting for duty
Hello 7 Processor 7 at node node062 reporting for duty
Hello 8 Processor 8 at node node062 reporting for duty
Hello 9 Processor 9 at node node062 reporting for duty
----------------------------------------
Begin PBS Epilogue Sat Jan 30 21:28:11 EST 2010 1264904891
Job ID: 35540.mgt
Username: tim
Group: Brown
Job Name: ex1
Session: 15533
Limits: neednodes=10:ppn=1,nodes=10:ppn=1,walltime=01:10:00
Resources: cput=00:00:00,mem=420kb,vmem=8216kb,walltime=00:00:03
Queue: dque
Account:
Nodes: node062 node063 node169 node170 node171 node172 node174 node175 node176
node177
Killing leftovers...
End PBS Epilogue Sat Jan 30 21:28:11 EST 2010 1264904891
----------------------------------------
UPDATE:
我想在一个PBS脚本中运行多个后台作业,以便作业可以同时运行。例如在上面的例子中,我添加另一个调用运行EX1和改变两个试验是在ex1.pbs
#!/bin/sh
#
#This is an example script example.sh
#
#These commands set up the Grid Environment for your job:
#PBS -N ex1
#PBS -l nodes=10:ppn=1,walltime=1:10:00
#PBS -q dque
echo "The first job starts!"
mpirun -np 5 --machinefile /home/tim/courses/MPI/examples/machinefile /home/tim/courses/MPI/examples/ex1 &
echo "The first job ends!"
echo "The second job starts!"
mpirun -np 5 --machinefile /home/tim/courses/MPI/examples/machinefile /home/tim/courses/MPI/examples/ex1 &
echo "The second job ends!"
(1)的结果是这个脚本的qsub后细与先前编译的可执行EX1背景。
The first job starts!
The first job ends!
The second job starts!
The second job ends!
WE have 5 processors
WE have 5 processors
Hello 1 Processor 1 at node node063 reporting for duty
Hello 2 Processor 2 at node node169 reporting for duty
Hello 3 Processor 3 at node node170 reporting for duty
Hello 1 Processor 1 at node node063 reporting for duty
Hello 4 Processor 4 at node node171 reporting for duty
Hello 2 Processor 2 at node node169 reporting for duty
Hello 3 Processor 3 at node node170 reporting for duty
Hello 4 Processor 4 at node node171 reporting for duty
(2)但是,我认为EX1的运行时间太快,可能这两个后台作业没有太多的运行时间重叠,当我以同样的方式适用于我的实际是不是这样的项目。于是我将睡眠(30)添加到ex1.c中,以延长ex1的运行时间,这样两个在后台运行ex1的作业几乎可以同时运行。
/* test of MPI */
#include "mpi.h"
#include <stdio.h>
#include <string.h>
#include <unistd.h>
int main(int argc, char **argv)
{
char idstr[2232]; char buff[22128];
char processor_name[MPI_MAX_PROCESSOR_NAME];
int numprocs; int myid; int i; int namelen;
MPI_Status stat;
MPI_Init(&argc,&argv);
MPI_Comm_size(MPI_COMM_WORLD,&numprocs);
MPI_Comm_rank(MPI_COMM_WORLD,&myid);
MPI_Get_processor_name(processor_name, &namelen);
if(myid == 0)
{
printf("WE have %d processors\n", numprocs);
for(i=1;i<numprocs;i++)
{
sprintf(buff, "Hello %d", i);
MPI_Send(buff, 128, MPI_CHAR, i, 0, MPI_COMM_WORLD); }
for(i=1;i<numprocs;i++)
{
MPI_Recv(buff, 128, MPI_CHAR, i, 0, MPI_COMM_WORLD, &stat);
printf("%s\n", buff);
}
}
else
{
MPI_Recv(buff, 128, MPI_CHAR, 0, 0, MPI_COMM_WORLD, &stat);
sprintf(idstr, " Processor %d at node %s ", myid, processor_name);
strcat(buff, idstr);
strcat(buff, "reporting for duty\n");
MPI_Send(buff, 128, MPI_CHAR, 0, 0, MPI_COMM_WORLD);
}
sleep(30); // new added to extend the running time
MPI_Finalize();
}
但重新编译和qsub再次后,结果似乎并不好。有进程中止。 在ex1.o35571:
The first job starts!
The first job ends!
The second job starts!
The second job ends!
WE have 5 processors
WE have 5 processors
Hello 1 Processor 1 at node node063 reporting for duty
Hello 2 Processor 2 at node node169 reporting for duty
Hello 3 Processor 3 at node node170 reporting for duty
Hello 4 Processor 4 at node node171 reporting for duty
Hello 1 Processor 1 at node node063 reporting for duty
Hello 2 Processor 2 at node node169 reporting for duty
Hello 3 Processor 3 at node node170 reporting for duty
Hello 4 Processor 4 at node node171 reporting for duty
4 additional processes aborted (not shown)
4 additional processes aborted (not shown)
在ex1.e35571
:
mpirun: killing job...
mpirun noticed that job rank 0 with PID 25376 on node node062 exited on signal 15 (Terminated).
mpirun: killing job...
mpirun noticed that job rank 0 with PID 25377 on node node062 exited on signal 15 (Terminated).
我不知道为什么有进程中止?我如何在PBS脚本中正确地背景作业?
非常感谢!这解决了我的问题。如果其他人为自己保留了一些节点,或者某些节点正在运行其他作业,那么mpiexec会提供$ PBS_NODEFILE作为机器文件通知?你也可以尝试回答我在http://superuser.com/questions/102812/torch-in-cluster上发布的关于在集群上使用PBS的问题吗?提前致谢! – Tim 2010-01-31 03:46:52