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#include <stdio.h>
#include <stdlib.h>
#include "IEEEIO.hh"
#include "vatoi.hh"
#include <sys/time.h>
double MPI_Wtime(){
timeval tv;
gettimeofday(&tv);
return tv.tv_sec + tv.tv_usec/1000000.0l;
}
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,np;
char *programname;
int bufsize;
void setDefaults(){
verbose=0;
dims[0]=dims[1]=dims[2]=20;
dimtype = Local;
np=1;
bufsize=0;
}
CommandLine(int argc,char *argv[]){
setDefaults();
parse(argc,argv);
}
void parse(int argc,char *argv[]){
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(!strcmp(flag,"np")) {
if(++i<argc)
np = atoi(val);
}
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(!strcmp(flag,"buffer")) {
if(++i<argc)
bufsize = vatoi(val);
}
else if(*flag=='h') usage();
}
}
void usage(){
printf("Usage: %s -np int <-verbose> <-dims int,int,int> <-dimtype global|local>",
programname);
printf("\tnp: Number of virtual processors (pretends to be parallel)\n");
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: np=%u verbose=%u dims=%u,%u,%u dimtype=%s\n",
programname,np,verbose,
dims[0],dims[1],dims[2],
(dimtype==Local)?"Local":"Global");
}
};
int main(int argc,char *argv[]){
CommandLine cmdln(argc,argv);
typedef int Array[3];
//int origin[3],dims[3];
Array *vorigin,*vdims;
int *origin,*dims;
int proclayout[3],area;
area=StupidProcLayoutSeive(cmdln.np,proclayout);
cmdln.printStatus();
printf("Proclayout = %u : %u,%u,%u\n",area,
proclayout[0],proclayout[1],proclayout[2]);
vorigin = new Array[cmdln.np];
vdims = new Array[cmdln.np];
int i;
for(int p=0;p<cmdln.np;p++){
dims=vdims[p];
for(i=0;i<3;i++) dims[i]=cmdln.dims[i];
if(cmdln.dimtype==CommandLine::Global)
for(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(i=0;i<proclayout[0];i++,p++){
origin = vorigin[p];
dims = vdims[p];
// assumes same dims per process
origin[0]=dims[0]*i;
origin[1]=dims[1]*j;
origin[2]=dims[2]*k;
if(cmdln.dimtype==CommandLine::Global){
// compute remainder for globaldims
if(k==(proclayout[2]-1)) dims[2]=cmdln.dims[2]-dims[2]*(k);
if(j==(proclayout[1]-1)) dims[1]=cmdln.dims[1]-dims[1]*(j);
if(i==(proclayout[0]-1)) dims[0]=cmdln.dims[0]-dims[0]*(i);
}
}
}
}
int globaldims[3]={0,0,0};
for(int p=0;p<cmdln.np;p++){
dims=vdims[p];
origin=vorigin[p];
printf("PE(%u) origin{%u,%u,%u} localdims{%u,%u,%u}\n",
p,origin[0],origin[1],origin[2],
dims[0],dims[1],dims[2]);
for(i=0;i<3;i++)
if(globaldims[i]<origin[i]+dims[i])
globaldims[i]=origin[i]+dims[i];
}
printf("Globaldims=%u,%u,%u\n",globaldims[0],globaldims[1],globaldims[2]);
int size,maxsize;
// find maxsize
{
int p;
for(p=0,maxsize=0;p<cmdln.np;p++){
size = IObase::nElements(3,vdims[p]);
// Everybody allocates their own local data
if(size>maxsize) maxsize=size;
}
size = maxsize; // for convenience
}
float *data = new float[size];
for(i=0;i<size;i++) data[i] = (float)i;
IEEEIO *file = new IEEEIO("chunkdata.raw",IObase::Write);
if(cmdln.bufsize>0)
file->bufferOn(cmdln.bufsize);
double stime = MPI_Wtime();
for(i=0;i<3;i++){ // do this 3 times
file->reserveChunk(IObase::Float32,3,globaldims);
for(int p=0;p<cmdln.np;p++){
dims=vdims[p];
origin=vorigin[p];
file->writeChunk(origin,dims,data); // should be same as MPIO file contents
}
}
double etime = MPI_Wtime();
printf("Elapsed time to write=%lf\n",etime-stime);
printf("IO performance = %f Megabytes/sec\n",
IObase::nBytes(IObase::Float32,3,globaldims)/(1024*1024*(etime-stime)));
delete file;
delete data;
}
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