Daniel Fischer
The profiling run on Linux looks like this:
individual inherited COST CENTRE MODULE no. entries %time %alloc %time %alloc
MAIN MAIN 1 0 95.7 0.2 100.0 100.0 ...
Insert lots of {-# SCC "foo" #-} pragmas (you did pass -auto-all on the command line when compiling?). You can't interpret a profile where almost everything is attributed to MAIN or main.
The -auto-all flag is on. The actual "main" function only takes up 3.5%
of the inherited time, and the program is only spending 2.4% of its time
doing GC.
Main itself is pretty trivial -- it creates an MVar, runs the server in
a forkIO (to get the accept() loop out of the main thread, as suggested
by http://haskell.org/haskellwiki/Simple_Servers), and blocks on the
mvar until the accept loop is terminated.
I'm just curious as to what the meaning of the MAIN cost centre is -- is
it just a catch-all bucket? Are we measuring time spent in the runtime
system?
G
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Gregory Collins