How do I compile and run this parallel program?
Michael
===========================
import Control.Parallel
nfib :: Int -> Intnfib n | n <= 1 = 1 | otherwise = par n1 (seq n2 (n1 +
n2 + 1)) where n1 = nfib (n-1) n2
= nfib (n-2)
{-nfib :: Int -> Intnfib n | n <= 1 = 1 | otherwise = nfib (n-1) + nfib
(n-2)-}
main = do putStrLn $ show $ nfib 39
===========================
[michael@hostname ~]$ ghc --make -threaded nfib.hs[michael@hostname ~]$ ./nfib
+RTS -N3nfib: the flag -N3 requires the program to be built with
-threadednfib: nfib: Usage: <prog> <args> [+RTS <rtsopts> | -RTS <args>] ...
--RTS <args>nfib: nfib: +RTS Indicates run time system options
follownfib: -RTS Indicates program arguments follownfib: --RTS
Indicates that ALL subsequent arguments will be given to thenfib:
program (including any of these RTS flags)nfib: nfib: The following run time
system options are available:nfib: nfib: -? Prints this message and
exits; the program is not executednfib: --info Print information about the
RTS used by this programnfib: nfib: -K<size> Sets the maximum stack size
(default 8M) Egs: -K32k -K512knfib: -k<size> Sets the initial thread stack
size (default 1k) Egs: -k4k -k2mnfib: nfib: -A<size> Sets the minimum
allocation area size (default
512k) Egs: -A1m -A10knfib: -M<size> Sets the maximum heap size (default
unlimited) Egs: -M256k -M1Gnfib: -H<size> Sets the minimum heap size
(default 0M) Egs: -H24m -H1Gnfib: -m<n> Minimum % of heap which must be
available (default 3%)nfib: -G<n> Number of generations (default: 2)nfib:
-T<n> Number of steps in younger generations (default: 2)nfib: -c<n>
Use in-place compaction instead of copying in the oldest generationnfib:
when live data is at least <n>% of the maximum heap size set withnfib:
-M (default: 30%)nfib: -c Use in-place compaction for all oldest
generation collectionsnfib: (the default is to use copying)nfib:
-w Use mark-region for the oldest generation (experimental)nfib: nfib:
-t[<file>] One-line GC statistics (if <file> omitted, uses stderr)nfib:
-s[<file>] Summary GC statistics (if <file> omitted, uses
stderr)nfib: -S[<file>] Detailed GC statistics (if <file> omitted, uses
stderr)nfib: nfib: nfib: -Z Don't squeeze out update frames on stack
overflownfib: -B Sound the bell at the start of each garbage
collectionnfib: nfib: -hT Heap residency profile (output file
<program>.hp)nfib: -i<sec> Time between heap samples (seconds, default:
0.1)nfib: nfib: -C<secs> Context-switch interval in seconds.nfib:
0 or no argument means switch as often as possible.nfib: Default:
0.02 sec; resolution is set by -V below.nfib: -V<secs> Master tick interval
in seconds (0 == disable timer).nfib: This sets the resolution for
-C and the profile timer -i.nfib: Default: 0.02 sec.nfib: nfib:
--install-signal-handlers=<yes|no>nfib: Install signal handlers
(default: yes)nfib: nfib: RTS options may also be specified using the GHCRTS
environment variable.nfib: nfib: Other RTS options may be available for
programs compiled a different way.nfib: The GHC User's Guide has full
details.nfib: [michael@hostname ~]$
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