我正在尝试构建一个具有一个主机和一个从机的PVM代码（我在centOS 5.5 OS上工作）
当我运行命令aimk master1 slave1时，预期会给出以下输出：
Spawning 3 worker tasks ... SUCCESSFUL
I got 100.000000 from 1; (expecting 100.000000)
I got 200.000000 from 0; (expecting 200.000000)
I got 300.000000 from 2; (expecting 300.000000)
但这表明
pvm> [1:t80002] EOF
[1:t80001] Spawning 6 worker tasks.....
[1:t80001] Trouble spawning slaves. Aborting.Error codes are:
[1:t80001] TID 3 -7
[1:t80001] TID 4 -7
[1:t80001] TID 5 -7
[1:t80001] libpvm [t80005] : pvm_mcast() : Bad parameter
[1:t80003] EOF
[1:t80004] EOF
为什么会出现此错误？为什么奴隶不工作？
我的代码如下，请帮我解决这个问题。
硕士1.c
static char rcsid[] =
"$Id: master1.c,v 1.4 1997/07/09 13:25:09 pvmsrc Exp $";
#include <stdio.h>
#include "pvm3.h"
#define SLAVENAME "slave1"
main()
{
int mytid; /* my task id */
int tids[32]; /* slave task ids */
int n, nproc, numt, i, who, msgtype, nhost, narch;
float data[100], result[32];
struct pvmhostinfo *hostp;
/* enroll in pvm */
mytid = pvm_mytid();
/* Set number of slaves to start */
pvm_config( &nhost, &narch, &hostp );
nproc = nhost * 3;
if( nproc > 32 ) nproc = 32 ;
printf("Spawning %d worker tasks ... " , nproc);
/* start up slave tasks */
numt=pvm_spawn(SLAVENAME, (char**)0, 0, "", nproc, tids);
if( numt < nproc ){
printf("\n Trouble spawning slaves. Aborting. Error codes are:\n");
for( i=numt ; i<nproc ; i++ ) {
printf("TID %d %d\n",i,tids[i]);
}
for( i=0 ; i<numt ; i++ ){
pvm_kill( tids[i] );
}
pvm_exit();
exit(1);
}
printf("SUCCESSFUL\n");
/* Begin User Program */
n = 100;
/* initialize_data( data, n ); */
for( i=0 ; i<n ; i++ ){
data[i] = 1.0;
}
/* Broadcast initial data to slave tasks */
pvm_initsend(PvmDataDefault);
pvm_pkint(&nproc, 1, 1);
pvm_pkint(tids, nproc, 1);
pvm_pkint(&n, 1, 1);
pvm_pkfloat(data, n, 1);
pvm_mcast(tids, nproc, 0);
/* Wait for results from slaves */
msgtype = 5;
for( i=0 ; i<nproc ; i++ ){
pvm_recv( -1, msgtype );
pvm_upkint( &who, 1, 1 );
pvm_upkfloat( &result[who], 1, 1 );
printf("I got %f from %d; ",result[who],who);
if (who == 0)
printf( "(expecting %f)\n", (nproc - 1) * 100.0);
else
printf( "(expecting %f)\n", (2 * who - 1) * 100.0);
}
/* Program Finished exit PVM before stopping */
pvm_exit();
}
slave1.c
static char rcsid[] =
"$Id: slave1.c,v 1.2 1997/07/09 13:25:18 pvmsrc Exp $";
#include <stdio.h>
#include "pvm3.h"
main()
{
int mytid; /* my task id */
int tids[32]; /* task ids */
int n, me, i, nproc, master, msgtype;
float data[100], result;
float work();
/* enroll in pvm */
mytid = pvm_mytid();
/* Receive data from master */
msgtype = 0;
pvm_recv( -1, msgtype );
pvm_upkint(&nproc, 1, 1);
pvm_upkint(tids, nproc, 1);
pvm_upkint(&n, 1, 1);
pvm_upkfloat(data, n, 1);
/* Determine which slave I am (0 -- nproc-1) */
for( i=0; i<nproc ; i++ )
if( mytid == tids[i] ){ me = i; break; }
/* Do calculations with data */
result = work( me, n, data, tids, nproc );
/* Send result to master */
pvm_initsend( PvmDataDefault );
pvm_pkint( &me, 1, 1 );
pvm_pkfloat( &result, 1, 1 );
msgtype = 5;
master = pvm_parent();
pvm_send( master, msgtype );
/* Program finished. Exit PVM before stopping */
pvm_exit();
}
float
work(me, n, data, tids, nproc )
/* Simple example: slaves exchange data with left neighbor (wrapping) */
int me, n, *tids, nproc;
float *data;
{
int i, dest;
float psum = 0.0;
float sum = 0.0;
for( i=0 ; i<n ; i++ ){
sum += me * data[i];
}
/* illustrate node-to-node communication */
pvm_initsend( PvmDataDefault );
pvm_pkfloat( &sum, 1, 1 );
dest = me+1;
if( dest == nproc ) dest = 0;
pvm_send( tids[dest], 22 );
pvm_recv( -1, 22 );
pvm_upkfloat( &psum, 1, 1 );
return( sum+psum );
}
最佳答案
显然，PVM找不到您的从站可执行文件。检查输出的这一部分：
[1:t80001] TID 3 -7
[1:t80001] TID 4 -7
[1:t80001] TID 5 -7
所有任务ID均为
-7，即PvmNoFile。确保SLAVENAME（在您的情况下为slave1）是绝对文件路径（在您的情况下不是），或者是位于PVM搜索路径中的可执行文件的名称。默认情况下，PVM搜索路径为：$HOME/pvm3/bin/$PVM_ARCH/
其中
$HOME是用户的主目录路径，而$PVM_ARCH是PVM体系结构的名称。