37 lines
989 B
OCaml
37 lines
989 B
OCaml
(* Performance test for I/O scheduling *)
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let mut = Mutex.create()
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let niter = ref 0
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let token = ref 0
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let process (n, ins, outs, nprocs) =
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let buf = String.create 1 in
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while true do
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Unix.read ins.(n) buf 0 1;
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(* Printf.printf "Thread %d got the token\n" n; *)
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if n = 0 then begin
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decr niter;
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if !niter <= 0 then exit 0
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end;
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let next = if n + 1 >= nprocs then 0 else n + 1 in
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(* Printf.printf "Thread %d sending token to thread %d\n" n next; *)
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Unix.write outs.(next) buf 0 1
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done
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let main() =
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let nprocs = int_of_string Sys.argv.(1) in
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let iter = int_of_string Sys.argv.(2) in
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let ins = Array.create nprocs Unix.stdin in
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let outs = Array.create nprocs Unix.stdout in
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for n = 0 to nprocs - 1 do
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let (i, o) = Unix.pipe() in ins.(n) <- i; outs.(n) <- o
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done;
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niter := iter;
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for i = 0 to nprocs - 1 do Thread.create process (i, ins, outs, nprocs) done;
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Unix.write outs.(0) "X" 0 1;
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Thread.delay 3600.
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let _ = main()
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