https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/performance-issue-about-pdgesv-function-in-scalapack/m-p/940717#M14450 <P>&nbsp; &nbsp; &nbsp;I am suffering from a problem about pdgesv function in scalapack(C++).I have two computing nodes,each with 16 cores.The time spent solveing the linear Equation with pdgesv in two noodes is almost fifth times larger than&nbsp;running in single node using the same number of processes.</P> <P>&nbsp; &nbsp; For example,A matrix is 1165*1165,and b matrix is 1165*30000.The job on&nbsp;single node with two processes&nbsp;takes almost 16 seconds while the job on two nodes each with one process takes more than 70 seconds.</P> <P>&nbsp; &nbsp; I know the reason should be the communication between these two nodes,but why the gap is so big and how to narrow the gap?Could someone give me some suggestions?</P> Wed, 18 Dec 2013 03:05:06 GMT Hongda_H_ 2013-12-18T03:05:06Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/performance-issue-about-pdgesv-function-in-scalapack/m-p/940717#M14450 <P>&nbsp; &nbsp; &nbsp;I am suffering from a problem about pdgesv function in scalapack(C++).I have two computing nodes,each with 16 cores.The time spent solveing the linear Equation with pdgesv in two noodes is almost fifth times larger than&nbsp;running in single node using the same number of processes.</P> <P>&nbsp; &nbsp; For example,A matrix is 1165*1165,and b matrix is 1165*30000.The job on&nbsp;single node with two processes&nbsp;takes almost 16 seconds while the job on two nodes each with one process takes more than 70 seconds.</P> <P>&nbsp; &nbsp; I know the reason should be the communication between these two nodes,but why the gap is so big and how to narrow the gap?Could someone give me some suggestions?</P> Wed, 18 Dec 2013 03:05:06 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/performance-issue-about-pdgesv-function-in-scalapack/m-p/940717#M14450 Hongda_H_ 2013-12-18T03:05:06Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/performance-issue-about-pdgesv-function-in-scalapack/m-p/940718#M14451 <P>the same as&nbsp;http://software.intel.com/en-us/forums/topic/497432</P> Thu, 19 Dec 2013 11:37:25 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/performance-issue-about-pdgesv-function-in-scalapack/m-p/940718#M14451 Gennady_F_Intel 2013-12-19T11:37:25Z