Mips vrs Dmips

[House91320]

I know that mips and dmips are different measurements of a micro what i was wandering if you had a micro running at 70mips how would it compare to one running at 70dmips.

[ejeffrey]

DMIPS is based on a benchmark that tests a profile of different integer operations.  MIPS is based on whatever the CPU manufacturer likes.  It could actually be DMIPS, it could be the instructions per second for the fastest instruction, or an average mix of instructions.  In any case, its interpretation is highly dependent on the instruction set.

[westfw]

I would not expect the DMIPS rating to EVER be faster than the MIPS rating.  DMIPS assumes a certain math precision, so things like 8-bit CPUs come out behind wider processors, even if they have a faster native instruction rate.  OTOH, DMIPS is subject to compiler variations, so you're really benchmarking a particular CPU/Compiler/Compiler-option combination (perhaps particularly relevant if there's a non-optimizing "free" version of an expensive "full-optimization" compiler...)