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open Eio.Std
let time label len fn =
let t0 = Unix.gettimeofday () in
fn ();
let t1 = Unix.gettimeofday () in
Metric.create
label
(`Float (float len /. (t1 -. t0) /. (2. ** 30.))) "GB/s"
"Reading from /dev/zero using a single FD"
let main ~domain_mgr zero =
let iters = 100_000 in
let len = 64 * 1024 in
let n_fibers = 4 in
let n_domains = 4 in
let buf = Cstruct.create len in
let run1 () =
for _ = 1 to iters do Eio.Flow.read_exact zero buf done
in
[time "fibers:1" (iters * len) run1;
time (Fmt.str "fibers:%d" n_fibers) (iters * n_fibers * len) (fun () ->
Switch.run @@ fun sw ->
for _ = 1 to n_fibers do
Fiber.fork ~sw run1
done
);
time (Fmt.str "domains:%d" n_domains) (iters * n_domains * len) (fun () ->
Switch.run @@ fun sw ->
for _ = 1 to n_domains do
Fiber.fork ~sw (fun () -> Eio.Domain_manager.run domain_mgr run1)
done
)]
let ( / ) = Eio.Path.( / )
let run env =
Eio.Path.with_open_in (env#fs / "/dev/zero") (main ~domain_mgr:env#domain_mgr)
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