topic Which is fast? in Software Tuning, Performance Optimization & Platform Monitoring

topic Which is fast? in Software Tuning, Performance Optimization & Platform Monitoring https://community.intel.com/t5/Software-Tuning-Performance/Which-is-fast/m-p/1066887#M5226 <P>Recently, I found a things. </P> <P>The computiing "<SPAN style="font-size: 1em; line-height: 1.5;">a<I>=b<I>*c<I>" and "</I></I></I></SPAN><SPAN style="font-size: 1em; line-height: 1.5;">a<I>+=b<I>*c<I>". In the same size, which runs fast on v3?</I></I></I></SPAN></P> <P><SPAN style="font-size: 1em; line-height: 1.5;">I complied it with "</SPAN>icc a.c  -xAVX  -O3".</P> <P><SPAN style="font-size: 1em; line-height: 1.5;">"a<I>+=b<I>*c<I>" runs faster than </I></I></I></SPAN><SPAN style="font-size: 13.008px; line-height: 19.512px;">"</SPAN><SPAN style="font-size: 1em; line-height: 1.5;">a<I>=b<I>*c<I>", almost 10 times performance.</I></I></I></SPAN></P> Wed, 07 Sep 2016 03:24:11 GMT GHui 2016-09-07T03:24:11Z Which is fast? https://community.intel.com/t5/Software-Tuning-Performance/Which-is-fast/m-p/1066887#M5226 <P>Recently, I found a things. </P> <P>The computiing "<SPAN style="font-size: 1em; line-height: 1.5;">a<I>=b<I>*c<I>" and "</I></I></I></SPAN><SPAN style="font-size: 1em; line-height: 1.5;">a<I>+=b<I>*c<I>". In the same size, which runs fast on v3?</I></I></I></SPAN></P> <P><SPAN style="font-size: 1em; line-height: 1.5;">I complied it with "</SPAN>icc a.c  -xAVX  -O3".</P> <P><SPAN style="font-size: 1em; line-height: 1.5;">"a<I>+=b<I>*c<I>" runs faster than </I></I></I></SPAN><SPAN style="font-size: 13.008px; line-height: 19.512px;">"</SPAN><SPAN style="font-size: 1em; line-height: 1.5;">a<I>=b<I>*c<I>", almost 10 times performance.</I></I></I></SPAN></P> Wed, 07 Sep 2016 03:24:11 GMT https://community.intel.com/t5/Software-Tuning-Performance/Which-is-fast/m-p/1066887#M5226 GHui 2016-09-07T03:24:11Z