@$(MAKE) -s build
build:
- @ocamlbuild -cflags '-w A' -pkgs 'str,unix' $(EXE_NAME).$(EXE_TYPE)
+ @ocamlbuild -cflags '-w A' -pkgs 'str,unix' -I lib $(EXE_NAME).$(EXE_TYPE)
@cp _build/$(EXE_NAME).$(EXE_TYPE) $(EXE_NAME)
@rm -f $(EXE_NAME).$(EXE_TYPE)
open Printf
-module Array = ArrayLabels
-module List = ListLabels
+module List = ListLabels
module StrSet = Set.Make(String)
-module Unix = UnixLabels
-
-module Metrics : sig
- type t
-
- val init
- : unit -> t
- val report
- : t
- -> wall_time_all:float
- -> wall_time_group_by_size:float
- -> wall_time_group_by_head:float
- -> wall_time_group_by_digest:float
- -> proc_time_all:float
- -> proc_time_group_by_size:float
- -> proc_time_group_by_head:float
- -> proc_time_group_by_digest:float
- -> unit
-
- val file_considered
- : t -> size:int -> unit
- val file_ignored
- : t -> size:int -> unit
- val file_empty
- : t -> unit
- val file_sampled
- : t -> unit
- val chunk_read
- : t -> size:int -> unit
- val file_unique_size
- : t -> size:int -> unit
- val file_unique_sample
- : t -> size:int -> unit
- val file_hashed
- : t -> size:int -> unit
- val digest
- : t -> unit
- val redundant_data
- : t -> size:int -> unit
-end = struct
- type t =
- { considered_files : int ref
- ; considered_bytes : int ref
- ; empty : int ref
- ; ignored_files : int ref
- ; ignored_bytes : int ref
- ; unique_size_files : int ref
- ; unique_size_bytes : int ref
- ; unique_sample_files : int ref
- ; unique_sample_bytes : int ref
- ; sampled_files : int ref
- ; sampled_bytes : int ref
- ; hashed_files : int ref
- ; hashed_bytes : int ref
- ; digests : int ref
- ; redundant_data : int ref
- }
-
- let init () =
- { considered_files = ref 0
- ; considered_bytes = ref 0
- ; empty = ref 0
- ; ignored_files = ref 0
- ; ignored_bytes = ref 0
- ; unique_size_files = ref 0
- ; unique_size_bytes = ref 0
- ; sampled_files = ref 0
- ; sampled_bytes = ref 0
- ; hashed_files = ref 0
- ; hashed_bytes = ref 0
- ; unique_sample_files = ref 0
- ; unique_sample_bytes = ref 0
- ; digests = ref 0
- ; redundant_data = ref 0
- }
-
- let add sum addend =
- sum := !sum + addend
-
- let file_considered t ~size =
- incr t.considered_files;
- add t.considered_bytes size
-
- let file_ignored {ignored_files; ignored_bytes; _} ~size =
- incr ignored_files;
- add ignored_bytes size
-
- let file_empty t =
- incr t.empty
-
- let chunk_read t ~size =
- add t.sampled_bytes size
-
- let file_sampled t =
- incr t.sampled_files
-
- let file_unique_size t ~size =
- incr t.unique_size_files;
- add t.unique_size_bytes size
-
- let file_unique_sample t ~size =
- incr t.unique_sample_files;
- add t.unique_sample_bytes size
-
- let file_hashed t ~size =
- incr t.hashed_files;
- add t.hashed_bytes size
-
- let digest t =
- incr t.digests
-
- let redundant_data t ~size =
- add t.redundant_data size
-
- let report
- t
- ~wall_time_all
- ~wall_time_group_by_size
- ~wall_time_group_by_head
- ~wall_time_group_by_digest
- ~proc_time_all
- ~proc_time_group_by_size
- ~proc_time_group_by_head
- ~proc_time_group_by_digest
- =
- let b_to_mb b = (float_of_int b) /. 1024. /. 1024. in
- let b_to_gb b = (b_to_mb b) /. 1024. in
- eprintf "Total time : %.2f wall sec %.2f proc sec\n%!"
- wall_time_all
- proc_time_all;
- eprintf "Considered : %8d files %6.2f Gb\n%!"
- !(t.considered_files)
- (b_to_gb !(t.considered_bytes));
- eprintf "Sampled : %8d files %6.2f Gb\n%!"
- !(t.sampled_files)
- (b_to_gb !(t.sampled_bytes));
- eprintf "Hashed : %8d files %6.2f Gb %6.2f wall sec %6.2f proc sec\n%!"
- !(t.hashed_files)
- (b_to_gb !(t.hashed_bytes))
- wall_time_group_by_digest
- proc_time_group_by_digest;
- eprintf "Digests : %8d\n%!"
- !(t.digests);
- eprintf "Duplicates (Hashed - Digests): %8d files %6.2f Gb\n%!"
- (!(t.hashed_files) - !(t.digests))
- (b_to_gb !(t.redundant_data));
- eprintf "Skipped due to 0 size : %8d files\n%!" !(t.empty);
- eprintf "Skipped due to unique size : %8d files %6.2f Gb %6.2f wall sec %6.2f proc sec\n%!"
- !(t.unique_size_files)
- (b_to_gb !(t.unique_size_bytes))
- wall_time_group_by_size
- proc_time_group_by_size;
- eprintf "Skipped due to unique sample : %8d files %6.2f Gb %6.2f wall sec %6.2f proc sec\n%!"
- !(t.unique_sample_files)
- (b_to_gb !(t.unique_sample_bytes))
- wall_time_group_by_head
- proc_time_group_by_head;
- eprintf "Ignored due to regex match : %8d files %6.2f Gb\n%!"
- !(t.ignored_files)
- (b_to_gb !(t.ignored_bytes))
-end
+module Unix = UnixLabels
module M = Metrics
-module Stream : sig
- type 'a t
-
- val create : (unit -> 'a option) -> 'a t
-
- val of_queue : 'a Queue.t -> 'a t
-
- val iter : 'a t -> f:('a -> unit) -> unit
-
- val bag_map : 'a t -> njobs:int -> f:('a -> 'b) -> ('a * 'b) t
- (** Parallel map with arbitrarily-reordered elements. *)
-
- val map : 'a t -> f:('a -> 'b) -> 'b t
-
- val filter : 'a t -> f:('a -> bool) -> 'a t
-
- val concat : ('a t) list -> 'a t
-
- val group_by : 'a t -> f:('a -> 'b) -> ('b * int * 'a list) t
-end = struct
- module S = Stream
-
- type 'a t =
- {mutable streams : ('a S.t) list}
-
- type ('input, 'output) msg_from_vassal =
- | Ready of int
- | Result of (int * ('input * 'output))
- | Exiting of int
-
- type 'input msg_from_lord =
- | Job of 'input option
-
- let create f =
- {streams = [S.from (fun _ -> f ())]}
-
- let of_queue q =
- create (fun () ->
- match Queue.take q with
- | exception Queue.Empty ->
- None
- | x ->
- Some x
- )
-
- let rec next t =
- match t.streams with
- | [] ->
- None
- | s :: streams ->
- (match S.next s with
- | exception Stream.Failure ->
- t.streams <- streams;
- next t
- | x ->
- Some x
- )
-
- let map t ~f =
- create (fun () ->
- match next t with
- | None -> None
- | Some x -> Some (f x)
- )
-
- let filter t ~f =
- let rec filter () =
- match next t with
- | None ->
- None
- | Some x when f x ->
- Some x
- | Some _ ->
- filter ()
- in
- create filter
-
- let iter t ~f =
- List.iter t.streams ~f:(S.iter f)
-
- let concat ts =
- {streams = List.concat (List.map ts ~f:(fun {streams} -> streams))}
-
- let group_by t ~f =
- let groups_tbl = Hashtbl.create 1_000_000 in
- let group_update x =
- let group = f x in
- let members =
- match Hashtbl.find_opt groups_tbl group with
- | None ->
- (1, [x])
- | Some (n, xs) ->
- (succ n, x :: xs)
- in
- Hashtbl.replace groups_tbl group members
- in
- iter t ~f:group_update;
- let groups = Queue.create () in
- Hashtbl.iter
- (fun name (length, members) -> Queue.add (name, length, members) groups)
- groups_tbl;
- of_queue groups
-
- module Ipc : sig
- val send : out_channel -> 'a -> unit
- val recv : in_channel -> 'a
- end = struct
- let send oc msg =
- Marshal.to_channel oc msg [];
- flush oc
-
- let recv ic =
- Marshal.from_channel ic
- end
-
- let lord t ~njobs ~vassals ~ic ~ocs =
- let active_vassals = ref njobs in
- let results = Queue.create () in
- let rec loop () =
- match ((Ipc.recv ic) : ('input, 'output) msg_from_vassal) with
- | Exiting i ->
- close_out ocs.(i);
- decr active_vassals;
- if !active_vassals = 0 then () else loop ()
- | Ready i ->
- Ipc.send ocs.(i) (Job (next t));
- loop ()
- | Result (i, result) ->
- Queue.add result results;
- Ipc.send ocs.(i) (Job (next t));
- loop ()
- in
- let rec wait = function
- | [] ->
- ()
- | vassals ->
- let pid, _process_status = Unix.wait () in
- (* TODO: handle process_status *)
- wait (List.filter vassals ~f:(fun p -> p <> pid))
- in
- loop ();
- close_in ic;
- wait vassals;
- of_queue results
-
- let vassal i ~f ~vassal_pipe_r ~lord_pipe_w =
- let ic = Unix.in_channel_of_descr vassal_pipe_r in
- let oc = Unix.out_channel_of_descr lord_pipe_w in
- let rec loop () =
- match (Ipc.recv ic : 'input msg_from_lord) with
- | Job (Some x) ->
- Ipc.send oc (Result (i, (x, f x)));
- loop ()
- | Job None ->
- Ipc.send oc (Exiting i)
- in
- Ipc.send oc (Ready i);
- loop ();
- close_in ic;
- close_out oc;
- exit 0
-
- let bag_map t ~njobs ~f =
- let lord_pipe_r, lord_pipe_w = Unix.pipe () in
- let vassal_pipes = Array.init njobs ~f:(fun _ -> Unix.pipe ()) in
- let vassal_pipes_r = Array.map vassal_pipes ~f:(fun (r, _) -> r) in
- let vassal_pipes_w = Array.map vassal_pipes ~f:(fun (_, w) -> w) in
- let vassals = ref [] in
- for i=0 to (njobs - 1) do
- begin match Unix.fork () with
- | 0 ->
- Unix.close lord_pipe_r;
- vassal i ~f ~lord_pipe_w ~vassal_pipe_r:vassal_pipes_r.(i)
- | pid ->
- vassals := pid :: !vassals
- end
- done;
- Unix.close lord_pipe_w;
- lord
- t
- ~njobs
- ~vassals:!vassals
- ~ic:(Unix.in_channel_of_descr lord_pipe_r)
- ~ocs:(Array.map vassal_pipes_w ~f:Unix.out_channel_of_descr)
-end
-
-module In_channel : sig
- val lines : ?delim_null:bool -> in_channel -> string Stream.t
-end = struct
- let read_until_newline ic () =
- match input_line ic with
- | exception End_of_file ->
- None
- | line ->
- Some line
-
- let read_until_null ic =
- let lexbuf = Lexing.from_channel ic in
- fun () -> Input_delim.by_null lexbuf
-
- let lines ?(delim_null=false) ic =
- let reader =
- if delim_null then
- read_until_null ic
- else
- read_until_newline ic
- in
- Stream.create reader
-end
-
-module File : sig
- type t =
- { path : string
- ; size : int
- }
-
- val find : string -> t Stream.t
- (** Find all files in the directory tree, starting from the given root path *)
-
- val lookup : string Stream.t -> t Stream.t
- (** Lookup file info for given paths *)
-
- val head : t -> len:int -> metrics:M.t -> string
-
- val filter_out_unique_sizes : t Stream.t -> metrics:M.t -> t Stream.t
- val filter_out_unique_heads : t Stream.t -> len:int -> metrics:M.t -> t Stream.t
-end = struct
- type t =
- { path : string
- ; size : int
- }
-
- let lookup paths =
- Stream.map paths ~f:(fun path ->
- let {Unix.st_size = size; _} = Unix.lstat path in
- {path; size}
- )
-
- let find root =
- let dirs = Queue.create () in
- let files = Queue.create () in
- let explore parent =
- Array.iter (Sys.readdir parent) ~f:(fun child ->
- let path = Filename.concat parent child in
- let {Unix.st_kind = file_kind; st_size; _} = Unix.lstat path in
- match file_kind with
- | Unix.S_REG ->
- let file = {path; size = st_size} in
- Queue.add file files
- | Unix.S_DIR ->
- Queue.add path dirs
- | Unix.S_CHR
- | Unix.S_BLK
- | Unix.S_LNK
- | Unix.S_FIFO
- | Unix.S_SOCK ->
- ()
- )
- in
- explore root;
- let rec next () =
- match Queue.is_empty files, Queue.is_empty dirs with
- | false, _ -> Some (Queue.take files)
- | true , true -> None
- | true , false ->
- explore (Queue.take dirs);
- next ()
- in
- Stream.create next
-
- let filter_out_singletons files ~group ~handle_singleton =
- let q = Queue.create () in
- Stream.iter (Stream.group_by files ~f:group) ~f:(fun group ->
- let (_, n, members) = group in
- if n > 1 then
- List.iter members ~f:(fun m -> Queue.add m q)
- else
- handle_singleton group
- );
- Stream.of_queue q
-
- let filter_out_unique_sizes files ~metrics =
- filter_out_singletons
- files
- ~group:(fun {size; _} -> size)
- ~handle_singleton:(fun (size, _, _) -> M.file_unique_size metrics ~size)
-
- let head {path; _} ~len ~metrics =
- M.file_sampled metrics;
- let buf = Bytes.make len ' ' in
- let ic = open_in_bin path in
- let rec read pos len =
- assert (len >= 0);
- if len = 0 then
- ()
- else begin
- let chunk_size = input ic buf pos len in
- M.chunk_read metrics ~size:chunk_size;
- if chunk_size = 0 then (* EOF *)
- ()
- else
- read (pos + chunk_size) (len - chunk_size)
- end
- in
- read 0 len;
- close_in ic;
- Bytes.to_string buf
-
- let filter_out_unique_heads files ~len ~metrics =
- filter_out_singletons
- files
- ~group:(head ~len ~metrics)
- ~handle_singleton:(fun (_, _, files) ->
- let {size; _} = List.hd files in (* Guaranteed non-empty *)
- M.file_unique_sample metrics ~size
- )
-end
-
type input =
| Stdin
| Directories of string list
--- /dev/null
+module Array = ArrayLabels
+module List = ListLabels
+module Unix = UnixLabels
+
+module M = Metrics
+
+type t =
+ { path : string
+ ; size : int
+ }
+
+let lookup paths =
+ Stream.map paths ~f:(fun path ->
+ let {Unix.st_size = size; _} = Unix.lstat path in
+ {path; size}
+ )
+
+let find root =
+ let dirs = Queue.create () in
+ let files = Queue.create () in
+ let explore parent =
+ Array.iter (Sys.readdir parent) ~f:(fun child ->
+ let path = Filename.concat parent child in
+ let {Unix.st_kind = file_kind; st_size; _} = Unix.lstat path in
+ match file_kind with
+ | Unix.S_REG ->
+ let file = {path; size = st_size} in
+ Queue.add file files
+ | Unix.S_DIR ->
+ Queue.add path dirs
+ | Unix.S_CHR
+ | Unix.S_BLK
+ | Unix.S_LNK
+ | Unix.S_FIFO
+ | Unix.S_SOCK ->
+ ()
+ )
+ in
+ explore root;
+ let rec next () =
+ match Queue.is_empty files, Queue.is_empty dirs with
+ | false, _ -> Some (Queue.take files)
+ | true , true -> None
+ | true , false ->
+ explore (Queue.take dirs);
+ next ()
+ in
+ Stream.create next
+
+let filter_out_singletons files ~group ~handle_singleton =
+ let q = Queue.create () in
+ Stream.iter (Stream.group_by files ~f:group) ~f:(fun group ->
+ let (_, n, members) = group in
+ if n > 1 then
+ List.iter members ~f:(fun m -> Queue.add m q)
+ else
+ handle_singleton group
+ );
+ Stream.of_queue q
+
+let filter_out_unique_sizes files ~metrics =
+ filter_out_singletons
+ files
+ ~group:(fun {size; _} -> size)
+ ~handle_singleton:(fun (size, _, _) -> M.file_unique_size metrics ~size)
+
+let head {path; _} ~len ~metrics =
+ M.file_sampled metrics;
+ let buf = Bytes.make len ' ' in
+ let ic = open_in_bin path in
+ let rec read pos len =
+ assert (len >= 0);
+ if len = 0 then
+ ()
+ else begin
+ let chunk_size = input ic buf pos len in
+ M.chunk_read metrics ~size:chunk_size;
+ if chunk_size = 0 then (* EOF *)
+ ()
+ else
+ read (pos + chunk_size) (len - chunk_size)
+ end
+ in
+ read 0 len;
+ close_in ic;
+ Bytes.to_string buf
+
+let filter_out_unique_heads files ~len ~metrics =
+ filter_out_singletons
+ files
+ ~group:(head ~len ~metrics)
+ ~handle_singleton:(fun (_, _, files) ->
+ let {size; _} = List.hd files in (* Guaranteed non-empty *)
+ M.file_unique_sample metrics ~size
+ )
--- /dev/null
+module M = Metrics
+
+type t =
+ { path : string
+ ; size : int
+ }
+
+val find : string -> t Stream.t
+(** Find all files in the directory tree, starting from the given root path *)
+
+val lookup : string Stream.t -> t Stream.t
+(** Lookup file info for given paths *)
+
+val head : t -> len:int -> metrics:M.t -> string
+
+val filter_out_unique_sizes : t Stream.t -> metrics:M.t -> t Stream.t
+val filter_out_unique_heads : t Stream.t -> len:int -> metrics:M.t -> t Stream.t
--- /dev/null
+let read_until_newline ic () =
+ match input_line ic with
+ | exception End_of_file ->
+ None
+ | line ->
+ Some line
+
+let read_until_null ic =
+ let lexbuf = Lexing.from_channel ic in
+ fun () -> Input_delim.by_null lexbuf
+
+let lines ?(delim_null=false) ic =
+ let reader =
+ if delim_null then
+ read_until_null ic
+ else
+ read_until_newline ic
+ in
+ Stream.create reader
--- /dev/null
+val lines : ?delim_null:bool -> in_channel -> string Stream.t
--- /dev/null
+open Printf
+
+type t =
+ { considered_files : int ref
+ ; considered_bytes : int ref
+ ; empty : int ref
+ ; ignored_files : int ref
+ ; ignored_bytes : int ref
+ ; unique_size_files : int ref
+ ; unique_size_bytes : int ref
+ ; unique_sample_files : int ref
+ ; unique_sample_bytes : int ref
+ ; sampled_files : int ref
+ ; sampled_bytes : int ref
+ ; hashed_files : int ref
+ ; hashed_bytes : int ref
+ ; digests : int ref
+ ; redundant_data : int ref
+ }
+
+let init () =
+ { considered_files = ref 0
+ ; considered_bytes = ref 0
+ ; empty = ref 0
+ ; ignored_files = ref 0
+ ; ignored_bytes = ref 0
+ ; unique_size_files = ref 0
+ ; unique_size_bytes = ref 0
+ ; sampled_files = ref 0
+ ; sampled_bytes = ref 0
+ ; hashed_files = ref 0
+ ; hashed_bytes = ref 0
+ ; unique_sample_files = ref 0
+ ; unique_sample_bytes = ref 0
+ ; digests = ref 0
+ ; redundant_data = ref 0
+ }
+
+let add sum addend =
+ sum := !sum + addend
+
+let file_considered t ~size =
+ incr t.considered_files;
+ add t.considered_bytes size
+
+let file_ignored {ignored_files; ignored_bytes; _} ~size =
+ incr ignored_files;
+ add ignored_bytes size
+
+let file_empty t =
+ incr t.empty
+
+let chunk_read t ~size =
+ add t.sampled_bytes size
+
+let file_sampled t =
+ incr t.sampled_files
+
+let file_unique_size t ~size =
+ incr t.unique_size_files;
+ add t.unique_size_bytes size
+
+let file_unique_sample t ~size =
+ incr t.unique_sample_files;
+ add t.unique_sample_bytes size
+
+let file_hashed t ~size =
+ incr t.hashed_files;
+ add t.hashed_bytes size
+
+let digest t =
+ incr t.digests
+
+let redundant_data t ~size =
+ add t.redundant_data size
+
+let report
+ t
+ ~wall_time_all
+ ~wall_time_group_by_size
+ ~wall_time_group_by_head
+ ~wall_time_group_by_digest
+ ~proc_time_all
+ ~proc_time_group_by_size
+ ~proc_time_group_by_head
+ ~proc_time_group_by_digest
+=
+ let b_to_mb b = (float_of_int b) /. 1024. /. 1024. in
+ let b_to_gb b = (b_to_mb b) /. 1024. in
+ eprintf "Total time : %.2f wall sec %.2f proc sec\n%!"
+ wall_time_all
+ proc_time_all;
+ eprintf "Considered : %8d files %6.2f Gb\n%!"
+ !(t.considered_files)
+ (b_to_gb !(t.considered_bytes));
+ eprintf "Sampled : %8d files %6.2f Gb\n%!"
+ !(t.sampled_files)
+ (b_to_gb !(t.sampled_bytes));
+ eprintf "Hashed : %8d files %6.2f Gb %6.2f wall sec %6.2f proc sec\n%!"
+ !(t.hashed_files)
+ (b_to_gb !(t.hashed_bytes))
+ wall_time_group_by_digest
+ proc_time_group_by_digest;
+ eprintf "Digests : %8d\n%!"
+ !(t.digests);
+ eprintf "Duplicates (Hashed - Digests): %8d files %6.2f Gb\n%!"
+ (!(t.hashed_files) - !(t.digests))
+ (b_to_gb !(t.redundant_data));
+ eprintf "Skipped due to 0 size : %8d files\n%!" !(t.empty);
+ eprintf "Skipped due to unique size : %8d files %6.2f Gb %6.2f wall sec %6.2f proc sec\n%!"
+ !(t.unique_size_files)
+ (b_to_gb !(t.unique_size_bytes))
+ wall_time_group_by_size
+ proc_time_group_by_size;
+ eprintf "Skipped due to unique sample : %8d files %6.2f Gb %6.2f wall sec %6.2f proc sec\n%!"
+ !(t.unique_sample_files)
+ (b_to_gb !(t.unique_sample_bytes))
+ wall_time_group_by_head
+ proc_time_group_by_head;
+ eprintf "Ignored due to regex match : %8d files %6.2f Gb\n%!"
+ !(t.ignored_files)
+ (b_to_gb !(t.ignored_bytes))
--- /dev/null
+type t
+
+val init
+ : unit -> t
+val report
+ : t
+ -> wall_time_all:float
+ -> wall_time_group_by_size:float
+ -> wall_time_group_by_head:float
+ -> wall_time_group_by_digest:float
+ -> proc_time_all:float
+ -> proc_time_group_by_size:float
+ -> proc_time_group_by_head:float
+ -> proc_time_group_by_digest:float
+ -> unit
+
+val file_considered
+ : t -> size:int -> unit
+val file_ignored
+ : t -> size:int -> unit
+val file_empty
+ : t -> unit
+val file_sampled
+ : t -> unit
+val chunk_read
+ : t -> size:int -> unit
+val file_unique_size
+ : t -> size:int -> unit
+val file_unique_sample
+ : t -> size:int -> unit
+val file_hashed
+ : t -> size:int -> unit
+val digest
+ : t -> unit
+val redundant_data
+ : t -> size:int -> unit
--- /dev/null
+module Array = ArrayLabels
+module List = ListLabels
+module S = Stdlib.Stream
+
+type 'a t =
+ {mutable streams : ('a S.t) list}
+
+type ('input, 'output) msg_from_vassal =
+ | Ready of int
+ | Result of (int * ('input * 'output))
+ | Exiting of int
+
+type 'input msg_from_lord =
+ | Job of 'input option
+
+let create f =
+ {streams = [S.from (fun _ -> f ())]}
+
+let of_queue q =
+ create (fun () ->
+ match Queue.take q with
+ | exception Queue.Empty ->
+ None
+ | x ->
+ Some x
+ )
+
+let rec next t =
+ match t.streams with
+ | [] ->
+ None
+ | s :: streams ->
+ (match S.next s with
+ | exception S.Failure ->
+ t.streams <- streams;
+ next t
+ | x ->
+ Some x
+ )
+
+let map t ~f =
+ create (fun () ->
+ match next t with
+ | None -> None
+ | Some x -> Some (f x)
+ )
+
+let filter t ~f =
+ let rec filter () =
+ match next t with
+ | None ->
+ None
+ | Some x when f x ->
+ Some x
+ | Some _ ->
+ filter ()
+ in
+ create filter
+
+let iter t ~f =
+ List.iter t.streams ~f:(S.iter f)
+
+let concat ts =
+ {streams = List.concat (List.map ts ~f:(fun {streams} -> streams))}
+
+let group_by t ~f =
+ let groups_tbl = Hashtbl.create 1_000_000 in
+ let group_update x =
+ let group = f x in
+ let members =
+ match Hashtbl.find_opt groups_tbl group with
+ | None ->
+ (1, [x])
+ | Some (n, xs) ->
+ (succ n, x :: xs)
+ in
+ Hashtbl.replace groups_tbl group members
+ in
+ iter t ~f:group_update;
+ let groups = Queue.create () in
+ Hashtbl.iter
+ (fun name (length, members) -> Queue.add (name, length, members) groups)
+ groups_tbl;
+ of_queue groups
+
+module Ipc : sig
+ val send : out_channel -> 'a -> unit
+ val recv : in_channel -> 'a
+end = struct
+ let send oc msg =
+ Marshal.to_channel oc msg [];
+ flush oc
+
+ let recv ic =
+ Marshal.from_channel ic
+end
+
+let lord t ~njobs ~vassals ~ic ~ocs =
+ let active_vassals = ref njobs in
+ let results = Queue.create () in
+ let rec loop () =
+ match ((Ipc.recv ic) : ('input, 'output) msg_from_vassal) with
+ | Exiting i ->
+ close_out ocs.(i);
+ decr active_vassals;
+ if !active_vassals = 0 then () else loop ()
+ | Ready i ->
+ Ipc.send ocs.(i) (Job (next t));
+ loop ()
+ | Result (i, result) ->
+ Queue.add result results;
+ Ipc.send ocs.(i) (Job (next t));
+ loop ()
+ in
+ let rec wait = function
+ | [] ->
+ ()
+ | vassals ->
+ let pid, _process_status = Unix.wait () in
+ (* TODO: handle process_status *)
+ wait (List.filter vassals ~f:(fun p -> p <> pid))
+ in
+ loop ();
+ close_in ic;
+ wait vassals;
+ of_queue results
+
+let vassal i ~f ~vassal_pipe_r ~lord_pipe_w =
+ let ic = Unix.in_channel_of_descr vassal_pipe_r in
+ let oc = Unix.out_channel_of_descr lord_pipe_w in
+ let rec loop () =
+ match (Ipc.recv ic : 'input msg_from_lord) with
+ | Job (Some x) ->
+ Ipc.send oc (Result (i, (x, f x)));
+ loop ()
+ | Job None ->
+ Ipc.send oc (Exiting i)
+ in
+ Ipc.send oc (Ready i);
+ loop ();
+ close_in ic;
+ close_out oc;
+ exit 0
+
+let bag_map t ~njobs ~f =
+ let lord_pipe_r, lord_pipe_w = Unix.pipe () in
+ let vassal_pipes = Array.init njobs ~f:(fun _ -> Unix.pipe ()) in
+ let vassal_pipes_r = Array.map vassal_pipes ~f:(fun (r, _) -> r) in
+ let vassal_pipes_w = Array.map vassal_pipes ~f:(fun (_, w) -> w) in
+ let vassals = ref [] in
+ for i=0 to (njobs - 1) do
+ begin match Unix.fork () with
+ | 0 ->
+ Unix.close lord_pipe_r;
+ vassal i ~f ~lord_pipe_w ~vassal_pipe_r:vassal_pipes_r.(i)
+ | pid ->
+ vassals := pid :: !vassals
+ end
+ done;
+ Unix.close lord_pipe_w;
+ lord
+ t
+ ~njobs
+ ~vassals:!vassals
+ ~ic:(Unix.in_channel_of_descr lord_pipe_r)
+ ~ocs:(Array.map vassal_pipes_w ~f:Unix.out_channel_of_descr)
--- /dev/null
+type 'a t
+
+val create : (unit -> 'a option) -> 'a t
+
+val of_queue : 'a Queue.t -> 'a t
+
+val iter : 'a t -> f:('a -> unit) -> unit
+
+val bag_map : 'a t -> njobs:int -> f:('a -> 'b) -> ('a * 'b) t
+(** Parallel map with arbitrarily-reordered elements. *)
+
+val map : 'a t -> f:('a -> 'b) -> 'b t
+
+val filter : 'a t -> f:('a -> bool) -> 'a t
+
+val concat : ('a t) list -> 'a t
+
+val group_by : 'a t -> f:('a -> 'b) -> ('b * int * 'a list) t
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