Hi guys,
I'm new in parallel programming with Haskell. I made a simple test
program using that par combinator etc, and was a bit unhappy that it
turns out to be slower than its sequential version. But firstly, I dont
fully understand how to read the runtime report produced by GHC with -s
option:
SPARKS: 5 (5 converted, 0 pruned)
INIT time 0.02s ( 0.01s elapsed)
MUT time 3.46s ( 0.89s elapsed)
GC time 5.49s ( 1.46s elapsed)
EXIT time 0.00s ( 0.00s elapsed)
Total time 8.97s ( 2.36s elapsed)
As I understand it from the documentation, the left time-column is the
CPU time, whereas the right one is elapses wall time. But how come that
the wall time is less than the CPU time? Isn't wall time = user's
perspective of time; so that is CPU time + IO + etc?
Any help?
--Wish.
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