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modified time benchmark to repeat same buffer over and over to avoid IO bottlenecks and get more consistent numbers.

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This commit is contained in:
Mark Borgerding
2003-11-01 04:44:50 +00:00
parent 471803ca08
commit 8ac63adc77
5 changed files with 118 additions and 16 deletions
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11
tools/Makefile
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@ -28,25 +28,26 @@ endif
$(UTIL): $(UTILSRC)
gcc -o $@ $(CFLAGS) $(TYPEFLAGS) $(UTILSRC)
RANDDAT=rand_$(DATATYPE)_$(NUMFFTS)_$(NFFT).dat
RANDDAT=rand_$(DATATYPE)_$(NFFT).dat
$(RANDDAT):
./rand_fft_data.py -n $(NUMFFTS) -N $(NFFT) -t $(DATATYPE) > $(RANDDAT)
./rand_fft_data.py -n 1 -N $(NFFT) -t $(DATATYPE) > $(RANDDAT)
time: all $(RANDDAT)
@echo
@echo -n "#### timing $(NUMFFTS) x $(NFFT) point FFTs. "; factor $(NFFT)
@if [ -x ~/fftw/st ] && [ $(DATATYPE) == "double" ]; then \
echo "#### FFTW FFT $(DATATYPE)"; \
time ~/fftw/st -n $(NFFT) < $(RANDDAT) > /dev/null;\
time ~/fftw/st -x $(NUMFFTS) -n $(NFFT) < $(RANDDAT) > /dev/null;\
fi
@echo "#### KISS FFT $(DATATYPE)"
@time ./$(UTIL) -n $(NFFT) < $(RANDDAT) > /dev/null
@time ./$(UTIL) -x $(NUMFFTS) -n $(NFFT) < $(RANDDAT) > /dev/null
@rm $(RANDDAT)
POW2=256 512 1024 2048
POW3=243 729 2187
POW5=25 125 625
mtime: all
@for n in $(POW2) ;do \
@for n in $(POW5) ;do \
export NFFT=$$n;make time; \
done

17
tools/fftutil.c
View File

@ -26,16 +26,20 @@ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
void fft_file(FILE * fin,FILE * fout,int nfft,int isinverse,int useascii)
void fft_file(FILE * fin,FILE * fout,int nfft,int isinverse,int useascii,int times)
{
int i;
void *st;
kiss_fft_cpx * buf;
kiss_fft_cpx * bufout;
buf = (kiss_fft_cpx*)malloc(sizeof(kiss_fft_cpx) * nfft );
bufout = (kiss_fft_cpx*)malloc(sizeof(kiss_fft_cpx) * nfft );
st = kiss_fft_alloc( nfft ,isinverse );
while ( fread( buf , sizeof(kiss_fft_cpx) * nfft ,1, fin ) > 0 ) {
kiss_fft( st , buf );
for (i=0;i<times;++i)
kiss_fft_io( st , buf ,bufout);
if (useascii) {
int i;
for (i=0;i<nfft;++i)
@ -46,6 +50,7 @@ void fft_file(FILE * fin,FILE * fout,int nfft,int isinverse,int useascii)
}
free(st);
free(buf);
free(bufout);
}
int main(int argc,char ** argv)
@ -55,14 +60,16 @@ int main(int argc,char ** argv)
FILE *fin=stdin;
FILE *fout=stdout;
int useascii=0;
int times=1;
while (1) {
int c=getopt(argc,argv,"n:ia");
int c=getopt(argc,argv,"n:iax:");
if (c==-1) break;
switch (c) {
case 'a':useascii=1;break;
case 'n':nfft = atoi(optarg);break;
case 'i':isinverse=1;break;
case 'x':times=atoi(optarg);break;
}
}
@ -78,7 +85,7 @@ int main(int argc,char ** argv)
++optind;
}
fft_file(fin,fout,nfft,isinverse,useascii);
fft_file(fin,fout,nfft,isinverse,useascii,times);
if (fout!=stdout) fclose(fout);
if (fin!=stdin) fclose(fin);