From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail4-relais-sop.national.inria.fr (mail4-relais-sop.national.inria.fr [192.134.164.105]) by walapai.inria.fr (8.13.6/8.13.6) with ESMTP id p82CpQ2u025962 for ; Fri, 2 Sep 2011 14:51:30 +0200 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AmMCAPvPYE5N6B+kcWdsb2JhbABCqHoBDAgOBxQmgUYBAQQBJxM/BQsLDgonB0YDAQ0GE4dyAgK3DoZlBIdjhFaMAowD X-IronPort-AV: E=Sophos;i="4.68,319,1312149600"; d="scan'208";a="107500364" Received: from fe01x03-cgp.akado.ru (HELO akado.ru) ([77.232.31.164]) by mail4-smtp-sop.national.inria.fr with ESMTP; 02 Sep 2011 14:51:30 +0200 Received: from [10.0.66.9] ([10.0.66.9] verified) by fe01-cgp.akado.ru (CommuniGate Pro SMTP 5.2.13) with ESMTPS id 296469491; Fri, 02 Sep 2011 16:51:29 +0400 Date: Fri, 2 Sep 2011 16:51:22 +0400 (MSD) From: malc X-X-Sender: malc@linmac To: David Allsopp cc: "caml-list@inria.fr" In-Reply-To: Message-ID: References: User-Agent: Alpine 2.00 (LNX 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Subject: RE: [Caml-list] Cross-platform cpu count On Fri, 2 Sep 2011, David Allsopp wrote: > malc wrote: > > On Fri, 2 Sep 2011, Daniel B?nzli wrote: > > > > > Hello, > > > > > > Can anybody confirm me that the following code works on cygwin : > > It won't - Sys.os_type returns "Cygwin" and getconf isn't in Cygwin either - http://cygwin.com/ml/cygwin/2010-12/msg00435.html (actually, it may be now - I haven't upgraded my Cygwin in a while - but it'll be a recent addition) > > > > > > > let cpu_count () = > > > try match Sys.os_type with > > > | "Win32" -> int_of_string (Sys.getenv "NUMBER_OF_PROCESSORS") > > > | _ -> > > > let i = Unix.open_process_in "getconf _NPROCESSORS_ONLN" in > > > let close () = ignore (Unix.close_process_in i) in > > > try Scanf.fscanf i "%d" (fun n -> close (); n) with e -> close (); > > raise e > > > with > > > | Not_found | Sys_error _ | Failure _ | Scanf.Scan_failure _ > > > | End_of_file | Unix.Unix_error (_, _, _) -> 1 > > > > > > Thanks, > > > > > > > http://repo.or.cz/w/apc.git/blob/55de75ccb853f5e4443fd484e5eb95e1342e72bd: > > /ml_apc.c > > The C code here uses a deprecated API call (probably for Windows NT 4 > compatibility). If you do end up using a C stub, use GetSystemInfo > (http://msdn.microsoft.com/en-us/library/ms724381(v=vs.85).aspx) - it's > easier to call. It's used in the OCaml runtime - see byterun/win32.c. > Personally, even for something where it's unimportant, I'd be nervous > relying on an environment variable (which can be edited...) Uhm, no, it uses native API which was never publically documented to begin with, and the reason for that that it provides other information which is unavailable via other means. -- mailto:av1474@comtv.ru