IPP vs SPL low performance

shdow — Tue, 14 Oct 2008 15:52:56 GMT

Hi,I wrote a simple application which compares performance of SPL and IPP libraries.I'm using function which searches maximum value in vector.Here is the source:

DWORD time1,time2,SPL,IPP;float max;
int maxindex;

float signal[32768];
for (UINT i=0;i<32768;++i)
signal = i;
time1 = GetTickCount();
for (int i=0;i<1000;++i)
ippsMaxIndx_32f(signal,32768,&max,&maxindex); //it is IPP function
time2 = GetTickCount();

IPP = time2-time1;

time1 = GetTickCount();
for (int i=0;i<1000;++i)
max = nspsMaxExt(signal,32768,&maxindex); //it is SPL function
time2 = GetTickCount();

SPL = time2-time1;

printf("%s%d%s","SPL Performance:",SPL,"\n");
printf("%s%d%s","IPP Performance:",IPP,"\n");

the result was very strange:

SPL Performance:172
IPP Performance:203

It is impossible tha IPP could be slower than SPL.

Re: IPP vs SPL low performance

Vladimir_Dudnik — Thu, 23 Oct 2008 17:16:24 GMT

That can be possible if you link with IPP static libraries and did not call ippStaticInit function which cause IPP static dispatcher switch to 'generic C' code instead of optimized branch.

Regards,
Vladimir

topic Re: IPP vs SPL low performance in Intel® Integrated Performance Primitives

IPP vs SPL low performance

Re: IPP vs SPL low performance