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#include <stdio.h>
#include "vatoi.hh"
#include "IEEEIO.hh"
#include "MPIutils.hh"
#include "MPIO.hh"
#include "Timer.hh"
int StupidProcLayoutSeive(int np,int decomp[3]){
// Brute-Force method
// stupidly attempts all decomposition combinations
// and filters out unusable combinations.
// trys to select minimum surface area processor arrangement
int minarea = np*np*np; // impossibly high value
for(int i=1;i<=np;i++){
for(int j=1;i*j<=np;j++){
for(int k=1;i*j*k<=np;k++){
if(i*j*k!=np) continue;
int area = i+j+k; // area metric (optimizing this weakly minimizes surface area)
if(area<minarea) {
minarea=area;
decomp[0]=i;
decomp[1]=j;
decomp[2]=k;
}
}
}
}
return minarea;
}
class CommandLine {
public:
enum DimType {Local,Global};
int verbose,dims[3],dimtype;
char *programname;
int bufsize;
int ntrials;
int syncsends;
void setDefaults(){
verbose=0;
ntrials=40;
dims[0]=dims[1]=dims[2]=20;
dimtype = Local;
bufsize=0;
syncsends=1; // default for now because it does so much better
}
CommandLine(int argc,char *argv[],MPIcomm *comm){
setDefaults();
parse(argc,argv,comm);
}
void parse(int argc,char *argv[],MPIcomm *comm){
programname=argv[0];
for(int i=1;i<argc;i++){
char *flag = argv[i],*val=argv[i+1];
if(*flag=='-') flag++;
else continue; // ignore non-flags
if(*flag=='v') {verbose=1;}
else if(!strcmp(flag,"dimtype")){
if((++i<argc) && (!strcmp(val,"global") || !strcmp(val,"Global")))
dimtype=Global;
}
else if(!strcmp(flag,"dims")){
if(++i<argc) sscanf(val,"%u,%u,%u",dims,dims+1,dims+2);
}
else if(*flag=='n'){
ntrials = atoi(val);
i++;
}
else if(*flag=='s'){
syncsends=1;
}
else if(!strcmp(flag,"buffer")) {
if(++i<argc)
bufsize = vatoi(val);
}
else if(*flag=='h' && !comm->rank()) usage();
}
}
void usage(){
printf("Usage: %s <-verbose> <-dims int,int,int> <-dimtype global|local>",
programname);
printf("\tverbose: Opens file for reading after complete and prints all values.\n");
printf("\tdims: Set the dimensions of the dataset. By default this is per-cpu.\n");
printf("\t\tThis can be Global dimensions if you use -dimtype flag.\n");
printf("\t\tDefault is 20,20,20.\n");
printf("\tdimtype: \'global\' makes dimensions apply to the overall dataset\n");
printf("\t\tregardless of number of processors and \'local\' is per-processor.\n");
printf("\t\tThe default is per-processor.\n");
}
void printStatus(FILE *f=stdout){
fprintf(f,"%s: verbose=%u dims=%u,%u,%u dimtype=%s\n",
programname,verbose,
dims[0],dims[1],dims[2],
(dimtype==Local)?"Local":"Global");
fprintf(f,"\t Buffer Cache is at %u bytes\n",bufsize);
}
};
int main(int argc,char *argv[]){
MPIenv env(argc,argv); // start MPI threads
MPIcomm *comm = env.getComm();
CommandLine cmdln(argc,argv,comm);
int origin[3],dims[3];
int proclayout[3],area;
int nghost=1;
area=StupidProcLayoutSeive(comm->numProcs(),proclayout);
// if(!comm->rank()) {
cmdln.printStatus();
fprintf(stderr,"Proclayout = %u : %u,%u,%u\n",area,
proclayout[0],proclayout[1],proclayout[2]);
//}
for(int i=0;i<3;i++) dims[i]=cmdln.dims[i];
if(cmdln.dimtype==CommandLine::Global)
for(int i=0;i<3;i++) dims[i]/=proclayout[i]; // create dims for layout computation
for(int p=0,k=0;k<proclayout[2];k++){
for(int j=0;j<proclayout[1];j++){
for(int i=0;i<proclayout[0];i++,p++){
if(p==comm->rank()){
// assumes same dims per process
origin[0]=dims[0]*i;
origin[1]=dims[1]*j;
origin[2]=dims[2]*k;
for(int n=0;n<3;n++){
if(origin[n]-nghost>0) {origin[n]-=nghost; dims[n]+=(nghost);}
dims[n]+=nghost;
}
if(cmdln.dimtype==CommandLine::Global){
// compute remainder for globaldims
if(k==(proclayout[2]-1))
dims[2]=cmdln.dims[2]-origin[2];
if(j==(proclayout[1]-1))
dims[1]=cmdln.dims[1]-origin[1];
if(i==(proclayout[0]-1))
dims[0]=cmdln.dims[0]-origin[0];
}
}
}
}
}
fprintf(stderr,"PE(%u) origin{%u,%u,%u} localdims{%u,%u,%u} nghost=%u\n",
comm->rank(),origin[0],origin[1],origin[2],
dims[0],dims[1],dims[2],nghost);
int size=1;
for(int i=0;i<3;i++) size*=dims[i];
// Everybody allocates their own local data
float *data = new float[size];
for(int i=0;i<size;i++) data[i] = (float)i;
IEEEIO *file=0;
if(!comm->rank()){ // only PE0 needs to open a file
IEEEIO *iofile;
file = iofile = new IEEEIO("mpdata.raw",IObase::Write);
if(cmdln.bufsize>0)
iofile->bufferOn(cmdln.bufsize);
}
else file=0; // else it is null
MPIO *pfile = new MPIO(file,*comm); // but everyone creates the pfile
pfile->setLocalDims(3,origin,dims);
// if(cmdln.syncsends) pfile->useSyncrhonousSend();
// puts("Write");
comm->barrier();
double stime = MPI_Wtime(); // start timing
//Timer t;
// t.start();
for(int i=0;i<cmdln.ntrials;i++){
// if(comm->rank()==0) fprintf(stderr,"Trial %4u\n",i);
comm->barrier();
pfile->write(data);
}
comm->barrier(); // synchronize completion
double etime = MPI_Wtime();
// t.end();
if(!comm->rank()){
printf("\nElapsed time to write=%lf\n",etime-stime);
}
puts("done writing");
delete pfile;
if(file) delete file;
delete data;
if(!comm->rank()){
file = new IEEEIO("mpdata.raw",IObase::Read);
int ndims[3],nrank;
IObase::DataType dt;
file->readInfo(dt,nrank,ndims);
printf("IO performance = %f Megabytes/sec\n",
(float)(cmdln.ntrials)*(float)(IObase::nBytes(dt,nrank,ndims))/(1024*1024*(etime-stime)));
printf("Read mpdata.raw: rank=%u dims=%u,%u,%u\n",nrank,ndims[0],ndims[1],ndims[2]);
if(cmdln.verbose){ // dangerous on T3E
data = new float[IObase::nElements(nrank,ndims)];
file->read(data);
for(int k=0,p=0;k<ndims[2];k++)
for(int j=0;j<ndims[1];j++)
for(int i=0;i<ndims[0];i++,p++)
printf("data[%u:%u:%u](%u) = %f\n",i,j,k,p,data[p]);
delete data;
}
delete file;
}
return 0;
}
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