I am trying to take a profile of a program, but when I run it, the
total time (as given in the profiling report file) is zero!
total time =0.00 secs (0 ticks @ 20 ms)
However, the -s option yields the following data:
3,429,300,984 bytes allocated in the heap
210,760,024 bytes copied during GC
23,647,224 bytes maximum residency (13 sample(s))
3,536,968 bytes maximum slop
58 MB total memory in use (0 MB lost due to fragmentation)
Generation 0: 6339 collections, 0 parallel, 1.14s, 1.42s elapsed
Generation 1:13 collections, 0 parallel, 0.28s, 0.34s elapsed
INIT time0.00s ( 0.00s elapsed)
MUT time 96.60s (124.50s elapsed)
GCtime1.42s ( 1.75s elapsed)
RPtime0.00s ( 0.00s elapsed)
PROF time0.00s ( 0.00s elapsed)
EXIT time0.00s ( 0.00s elapsed)
Total time 98.02s (126.25s elapsed)
%GC time 1.4% (1.4% elapsed)
Alloc rate35,498,347 bytes per MUT second
Productivity 98.5% of total user, 76.5% of total elapsed
The time taken by each cost centre is also zero. The program is
compiled with options "-prof -auto-all -caf-all" by GHC 7.0.3 and run
with RTS options "-p -s".
The true time taken is certainly NOT zero. How is this possible?
Thanks.
Cheers,
Matthew Farkas-Dyck
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