January 2009 - Darwin-dev - lists.apple.com

Re: constrain an app to one core?
by Andrew Gallatin 31 Jan '09

31 Jan '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=simple/simple; d=cs.duke.edu; s=mail; t=1233411203; bh=JfiK58q4C9Rx/jadxs1NbA3KdUPkC3nPKe2vMtzSb+g=; h=Message-ID:Date:From:MIME-Version:To:CC:Subject:References: In-Reply-To:Content-Type:Content-Transfer-Encoding; b=bb2TNhh3ojjg t5XYg6LdZgIIWh4fUe+m/wNWZZ+c7L/Y5QlJqElJtukHscjWCgwwCD5vPGNDcVr5Ouv zr0+cyUseyRcEyN6RdMnNr1GTc6QGgsqFgHa/RDRbFi0wBUWAxS1vx87bV2CVwytfc8 fc8EiY18PFK1GQYfFMcTg0awo= User-agent: Thunderbird 2.0.0.16 (X11/20080724) You can use utilBindThreadToCPU(). However, it requires the CHUD tools kext be loaded, so it is not at all appropriate for a shipping product. As somebody else said, it might be best to fix your bug. Drew PS: Here is a hack which binds a program to a CPU: #include <stdio.h> #include <stdlib.h> int main(int argc, char *argv[]) { int cpu = atoi(argv[1]); int ret; chudInitialize(); printf("binding to cpu %d\n", cpu); ret = utilBindThreadToCPU(cpu); if (ret != 0) { fprintf(stderr, "bind failed, return = %d\n", ret); fprintf(stderr, "check that chud kext is installed\n"); fprintf(stderr, "and CPU %d is online\n", cpu); exit(1); } execv(argv[2], &argv[2]); return(0); } _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: constrain an app to one core?
by Tim Seufert 31 Jan '09

31 Jan '09

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Re: GetTickCount on the mac
by Andy Wiese 30 Jan '09

30 Jan '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Jan 30, 2009, at 3:22 PM, Jason Coco wrote: On Jan 30, 2009, at 16:01 , Andy Wiese wrote: On Jan 30, 2009, at 9:05 AM, Jason Coco wrote: On Jan 30, 2009, at 09:27 , Christopher Khaljah Xu wrote: Hi there! I'm a rookie on a mac. I've been trying to port some windows programs that was written in C/C++ onto the mac. I need to rewrite a timer that measures CPU ticks between the start and end of an operation. I wonder if there is something in the mac api similar as GetTickCount or GetTickCount64 ? You can use mach_absolute_time() (declared in mach/mach_time.h) for this purpose. For more information on using this routine, see this technical qa: http://developer.apple.com/qa/qa2004/qa1398.html Jason How does clock(3) compare to mach_absolute_time()? mach_absolute_time() actually counts the clock cycles and is the reference timer for everything else. Internally, from the C library, clock(3) calls getrusage(2) on itself and returns the converted sum of its system and user time. So resolution issues aside (I understand that clock is low resolution), clock(3) attempts to measure the cpu usage of the particular process, and mach_absolute_time will give the system global cpu time. Correct? So for my purposes, I want rough measurements of a single relatively long-running task (a cgi handler) in an environment that is polluted with many such processes, so clock(3) is actually a pretty good choice. (The fact that the deployment environment is FreeBSD makes it an even better choice, but that is off-topic and off-platform). _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: GetTickCount on the mac
by Tommy Nordgren 30 Jan '09

30 Jan '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Jan 30, 2009, at 3:27 PM, Christopher Khaljah Xu wrote: #include <CoreServices/CoreServices.h> long TickCount(); _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… Hi there! I'm a rookie on a mac. I've been trying to port some windows programs that was written in C/C++ onto the mac. I need to rewrite a timer that measures CPU ticks between the start and end of an operation. I wonder if there is something in the mac api similar as GetTickCount or GetTickCount64 ? //Found in ca one minute by searching the Xcode docs for for symbols containing 'TickCount' ------------------------------------------------------ "Home is not where you are born, but where your heart finds peace" - Tommy Nordgren, "The dying old crone" tommy.nordgren(a)comhem.se This email sent to site_archiver(a)lists.apple.com

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Re: GetTickCount on the mac
by Shawn Erickson 30 Jan '09

30 Jan '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=s7khry5Xpyz395VJPrDTq0H5epB9lanGLbgPskGewn8=; b=IveT/65nWWllvbrOSg3iMRi9iPFAOAiI10VK/U23ZdkgV8GUX0nqTyAlboeZnKpP+r HKqZd2EMYp7xNIjCmbaXQVeKrTj56jb1LVh0DWvqhp0/i4ZKbrYPZeDL0sehRN0zgDWb /13KChNU6C5P9eZUJR+pfW8s3zjzK1McKCJHw= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=wME28ERMYLMuHZ4i3lthoUUcHid0chTJ+sNA4ouw/cXh9MNUa4H8J+4bFUpgmS5wP1 GKoeTF9ml9Nx4prFYIEsZ06htxjD4CBO04JicCJ9mVrFGzF3iIuRu5Y0yxg9l5p873Mo EFW6PoaWqafCkWfTkhdoofr/ZbFCi+V7tU1rc= On Fri, Jan 30, 2009 at 1:01 PM, Andy Wiese <andyw(a)mitosystems.com> wrote: > How does clock(3) compare to mach_absolute_time()? Poorly... given that the resolution of clock is 100 ticks per second on Mac OS X while mach_absolute_time can get into the 10s / 100s of nanoseconds. -Shawn _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: GetTickCount on the mac
by Jason Coco 30 Jan '09

30 Jan '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:cc:message-id:from:to :in-reply-to:content-type:content-transfer-encoding:mime-version :subject:date:references:x-mailer; bh=s+s4BJ3W6d3gA/SrdDXbUorzOH3PYc0hJxAs7zskGHs=; b=FYg1w8zvruWRBsi6/scyGZ76FAbxEU0j5Phfo8kxpkRMyG3VoUD4LBQq+mLRUp0KeI PdM8+Hs9xtGogwsoTyFPbW40Vzo/Euwj29x9h/wJi9K9r6iZXiS15sgzehhc16/eXKVz ieqR80ASJtuAocuRjl1p01x6O2x348FGCeuTs= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=cc:message-id:from:to:in-reply-to:content-type :content-transfer-encoding:mime-version:subject:date:references :x-mailer; b=Tq1ZjNwAU4cd1CL4fY9uFCeJv7vbR+eRXS1gs2NUXrVMsPdXA21JDusqfr1HvSTlLC jgMoNtwNRc2p05jffRwK69FweZycoL6mTXomAmb+L/2DLWb1fn/w3TIptjUJiFpdpQtx tXgbzzrVoqE81eqaoZoDlg3txleJfTbmxA1CI= On Jan 30, 2009, at 16:01 , Andy Wiese wrote: On Jan 30, 2009, at 9:05 AM, Jason Coco wrote: On Jan 30, 2009, at 09:27 , Christopher Khaljah Xu wrote: Hi there! I'm a rookie on a mac. I've been trying to port some windows programs that was written in C/C++ onto the mac. I need to rewrite a timer that measures CPU ticks between the start and end of an operation. I wonder if there is something in the mac api similar as GetTickCount or GetTickCount64 ? You can use mach_absolute_time() (declared in mach/mach_time.h) for this purpose. For more information on using this routine, see this technical qa: http://developer.apple.com/qa/qa2004/qa1398.html Jason How does clock(3) compare to mach_absolute_time()? mach_absolute_time() actually counts the clock cycles and is the reference timer for everything else. Internally, from the C library, clock(3) calls getrusage(2) on itself and returns the converted sum of its system and user time. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: GetTickCount on the mac
by Andy Wiese 30 Jan '09

30 Jan '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Jan 30, 2009, at 9:05 AM, Jason Coco wrote: On Jan 30, 2009, at 09:27 , Christopher Khaljah Xu wrote: How does clock(3) compare to mach_absolute_time()? _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… Hi there! I'm a rookie on a mac. I've been trying to port some windows programs that was written in C/C++ onto the mac. I need to rewrite a timer that measures CPU ticks between the start and end of an operation. I wonder if there is something in the mac api similar as GetTickCount or GetTickCount64 ? You can use mach_absolute_time() (declared in mach/mach_time.h) for this purpose. For more information on using this routine, see this technical qa: http://developer.apple.com/qa/qa2004/qa1398.html Jason This email sent to site_archiver(a)lists.apple.com

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Re: Easiest way to get function name/offset from a hex address?
by Terry Lambert 30 Jan '09

30 Jan '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Within the program itself: man dladdr Outside the program itself: man atos The debugger, gdb, also has multiple modes in which it operates, two of which can be programmatically controlled (to permit things like GUIs that still use gdb internally). You could open the binary with gdb in one of these modes and interactively query gdb for the information. Can you tell me what these modes are? Or at least what to look for in the manual? The GDB/MI Interface <http://sourceware.org/gdb/current/onlinedocs/gdb_26.html#SEC260> You can attach GUI apps after they are already launched. -- Terry _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… On Jan 29, 2009, at 6:29 AM, Karan, Cem (Civ, ARL/CISD) wrote: Terry Lambert wrote on Wednesday, January 28, 2009 4:37 PM My first choice is GDB, if I can get it to launch GUI apps correctly. However, for alpha/beta testing, the dladdr trick is probably what I'll need. Crash reports just don't give enough info on how I got into the state I'm currently in. This email sent to site_archiver(a)lists.apple.com

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constrain an app to one core?
by fred ross-perry 30 Jan '09

30 Jan '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Thread-index: AcmCcHeGthPayu5jEd2hSAAX8stjOwAjyt80AAAJPbQ= Thread-topic: constrain an app to one core? User-agent: Microsoft-Entourage/11.3.3.061214 _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: GetTickCount on the mac
by Jason Coco 30 Jan '09

30 Jan '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:cc:message-id:from:to :in-reply-to:content-type:content-transfer-encoding:mime-version :subject:date:references:x-mailer; bh=j89FTxH8Js5j9FIku27UoVY0TekkmVC7AFZfiwtL3u8=; b=ugNJY+7CcDK5LEJBj4udkicOHkxA2VEFcVCC0YnRW/yDAgTRq3efI/SBNuCIu2tOb3 f8ZjjgEpUbdlgbYbBi1W+NQLjmrzbNyrXUVEEK61+5ecmACXqBd73qFhCH7lfcW6M+qp G3H1gbluIwQWjvfYhpqkMr6TV9qCWApd0KSxo= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=cc:message-id:from:to:in-reply-to:content-type :content-transfer-encoding:mime-version:subject:date:references :x-mailer; b=hohZfMRh01STahIWWA7OvfrdWxYbTfitSl4Je5U/enhvNrc0InpV1ZFnibdaD/LDWL g5AzbF6IeuBnjYrfp0IERmWVpLNDMUTdrY89ypIn9i+hWRsclWqXdWj+uTdVXx3tPAln AuQHM7ter8kqjrXj82XQjLFX9fzpoArOz0D30= On Jan 30, 2009, at 09:27 , Christopher Khaljah Xu wrote: Jason _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… Hi there! I'm a rookie on a mac. I've been trying to port some windows programs that was written in C/C++ onto the mac. I need to rewrite a timer that measures CPU ticks between the start and end of an operation. I wonder if there is something in the mac api similar as GetTickCount or GetTickCount64 ? You can use mach_absolute_time() (declared in mach/mach_time.h) for this purpose. For more information on using this routine, see this technical qa: http://developer.apple.com/qa/qa2004/qa1398.html This email sent to site_archiver(a)lists.apple.com

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