cpu vs. wall clock times

In comparing cpu and wall clock times in a job information report I see three cases:
a) cpu time just slightly smaller than wall clock time - OK
b) cpu time a fair bit more than wall clock time - presumably multi-threaded solutions
but also
c) very small cpu time, but a substantial wall clock time, e.g.
0.002999 0.870433
0.002998 0.231191
0.002998 0.70621
0.002998 0.460266

Why this last case? and are both numbers accurate?

- David

David,

I am sorry, but I have no special insight into this issue. I would suggest running examples of those particular three situations on your local computer, to see if you observe something similar. This may be a characteristic of the benchmarks, rather than an issue with StarExec. Wallclock and CPU times for sequential solvers can differ greatly if a lot of system time is required, for example. This could be the case for reading very large benchmarks into memory. This is just speculation, of course.