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https://gitlab.com/scemama/QCaml.git
synced 2024-12-22 04:13:33 +01:00
Improved parallel
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commit
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CI/CI.ml
2
CI/CI.ml
@ -91,7 +91,7 @@ let create_matrix_spin f det_space =
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(** Update function when ki and kj are connected *)
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let update i j ki kj =
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let x = f ki kj in
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if x <> 0. then
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if abs_float x < Constants.epsilon then
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result.(i) <- (j, x) :: result.(i) ;
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in
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@ -1,4 +1,7 @@
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(* Single process function *)
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(********************************************************************)
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(* Single process *)
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(********************************************************************)
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let run_sequential f stream =
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let rec next _ =
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@ -10,24 +13,47 @@ let run_sequential f stream =
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Stream.from next
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(* Multi-process functions *)
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(********************************************************************)
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(* Server side *)
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(********************************************************************)
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type task_id = int
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let debug _s =
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()
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(*
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Printf.eprintf "%d : %s : %s\n%!" (Mpi.comm_rank Mpi.comm_world) (Unix.gettimeofday () |> string_of_float) _s
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*)
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(* Server side *)
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let run_parallel_server ~ordered stream =
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(* n_running is the number of running tasks, required for clean
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termination. It is the number of tasks to wait for when the input stream
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is empty.
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*)
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let n_running = ref 0 in
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(** Fetches a result coming from any client. Returns the result
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as a (task_id * 'a) option and the rank of the client as an int.
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*)
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let fetch_result () : (task_id * 'a) option * int =
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let (message, rank, _tag) : (task_id * 'a) option * int * int =
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debug "Before receive_status";
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Mpi.receive_status Mpi.any_source Mpi.any_tag Mpi.comm_world
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in
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debug @@ Printf.sprintf "After receive_status %d %d" rank _tag;
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decr n_running;
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message, rank
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in
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let send_task (client_rank : int) : unit =
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(** Pops a task from the stream and sends it to a client.
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If no task is available, sends [None].
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The return value is a boolean telling if the stream is empty.
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*)
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let send_task (client_rank : int) : bool =
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let task =
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try
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let task_id = Stream.count stream in
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@ -35,46 +61,69 @@ let run_parallel_server ~ordered stream =
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Some (task_id, element)
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with Stream.Failure -> None
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in
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Mpi.send task client_rank 0 Mpi.comm_world
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debug @@ Printf.sprintf "Sending to %d\n" client_rank;
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Mpi.send task client_rank 0 Mpi.comm_world;
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debug @@ Printf.sprintf "Sent to %d : %s\n" client_rank
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(if task = None then "None" else "Some")
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;
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let running = task <> None in
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if running then incr n_running;
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running
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in
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(* n_todo is required for clean termination. It is the
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number of tasks to wait for when the input stream is
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empty. *)
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let n_todo = ref (Mpi.comm_size Mpi.comm_world ) in
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let rec get_result () : (task_id * 'a ) option =
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begin
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match Stream.peek stream with
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| None -> decr n_todo
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| _ -> ()
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end;
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match !n_todo with
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| 0 ->
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begin
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Mpi.barrier Mpi.comm_world;
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None
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end
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| _ ->
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begin
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let message, rank = fetch_result () in
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send_task rank;
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match message with
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| None -> get_result ()
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| Some (task_id, result) -> Some (task_id, result)
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end
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(** Main loop.
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While [n_todo > 0], fetch a result from a client
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and send it back a new task. If no more tasks are
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available, send [None]. If the result of the task
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is None, loop back into [get_result].
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TODO : bug is probably here...
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*)
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let rec get_result () : (task_id * 'a ) option =
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let message, rank = fetch_result () in
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let iterate = send_task rank in
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match iterate, message with
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| true , None -> (incr n_running ; get_result ())
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| true , Some (task_id, result) -> Some (task_id, result)
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| false, Some (task_id, result) ->
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if !n_running > 0 then
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Some (task_id, result)
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else
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( debug "Before barrier";
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Mpi.barrier Mpi.comm_world;
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debug "After barrier";
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None;)
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| false, None -> assert false
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in
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(** Function from which the output stream is built. *)
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let f =
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if ordered then
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(* buffer of finished tasks with a task_id greater than the
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current result_id. It allows to put back the results in
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the correct order.
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if not ordered then
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(* If [ordered] is false, the values are popped out whenever they arrive
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from the clients.
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*)
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let buffer = Hashtbl.create 67 in
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fun _ ->
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match get_result () with
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| Some (_, result) -> Some result
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| None -> None
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else
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(* If [ordered] is true, out into the stream when the next expected task has
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been computed.
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*)
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let buffer =
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(* buffer of finished tasks with a task_id greater than the
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current result_id. It allows to put back the results in
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the correct order.
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*)
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Hashtbl.create 67
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in
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fun i ->
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begin
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@ -94,36 +143,56 @@ let run_parallel_server ~ordered stream =
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in loop ()
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end
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else
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fun _ ->
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match get_result () with
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| Some (_, result) -> Some result
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| None -> None
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in
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Stream.from f
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(** Client side *)
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let run_parallel_client f =
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Mpi.send None 0 0 Mpi.comm_world;
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(********************************************************************)
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(* Client side *)
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(********************************************************************)
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let run_parallel_client f =
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(** Send a first message containing [None] to request a task *)
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debug "Before send None";
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Mpi.send None 0 0 Mpi.comm_world;
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debug "After send None";
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(** Main loop.
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Receive a message. If the message is [None], there are no more
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tasks to compute and we can go to the barrier.
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If the message is not [None], apply [f] to the task, send the
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result back to the server and loop.
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*)
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let rec run () =
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let message =
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Mpi.receive 0 Mpi.any_tag Mpi.comm_world
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debug "Before receive";
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Mpi.receive 0 0 Mpi.comm_world
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in
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debug "After receive" ;
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match message with
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| None -> Mpi.barrier Mpi.comm_world
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| None ->
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( debug "Before barrier";
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Mpi.barrier Mpi.comm_world;
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debug "After barrier";)
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| Some (task_id, task) ->
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let result = f task in
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begin
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debug @@ Printf.sprintf "Before send task_id %d" task_id ;
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Mpi.send (Some (task_id, result)) 0 0 Mpi.comm_world;
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debug @@ Printf.sprintf "After send task_id %d" task_id ;
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run ()
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end
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in
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run ();
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(* The output is an empty stream so that the type of run_parallel_client
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is the same as the type of the server function.
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*)
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Stream.of_list []
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