### Operation count for DSGESV and DSPOSV

Posted:

**Thu Jan 02, 2014 1:15 pm**Hello,

I'm doing some benchmarking using mixed precision DSGESV and DSPOSV and I need to know the number of operations performed for these routines. I know for high dimensions the term O(N^3) from internal SGESV is dominant, but I wold like to know also the exact number of operations (adds and products), including O(N^2) and O(N), which should be dependent on the final number of iterations (and on NRHS, of course). I've inspected the lawn41, but both DSGESV and DSPOSV were introduced in Lapack after the document. Exist any strict operation counting for the functions?

Thanks

PS: Ob course, I'm considering a case where DSGESV and DSPOSV finalize without errors: iter<=30, not overflow nor sgetrf failure.

I'm doing some benchmarking using mixed precision DSGESV and DSPOSV and I need to know the number of operations performed for these routines. I know for high dimensions the term O(N^3) from internal SGESV is dominant, but I wold like to know also the exact number of operations (adds and products), including O(N^2) and O(N), which should be dependent on the final number of iterations (and on NRHS, of course). I've inspected the lawn41, but both DSGESV and DSPOSV were introduced in Lapack after the document. Exist any strict operation counting for the functions?

Thanks

PS: Ob course, I'm considering a case where DSGESV and DSPOSV finalize without errors: iter<=30, not overflow nor sgetrf failure.