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

Re: 64-bit Mac OS X kernel
by rohan a 19 Aug '09

19 Aug '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=RNt4Zuyx2lX4did6H8TmBrUt4rnusVjHcesMZPwN2YM=; b=J8wgi8N6U/+S58k0g2KTxNLD15+T6AB+i9lx+goSzQqPekBIO9Tq4GESlp6o5OQGd8 6ElwUO+49fo6I9r2gko3PCAj0YEP7+ZH0M+YE639q54rAN55jCqCeuv0JNBUnScvxE9i JvEjUobIMQxHTSzf5qc5DsfhxA/E6+5gbLlsw= 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=MV9NfDZzeae+J5rjVsVnEkXjYC3Hg8s6p6QsXu+bBDnWdls+Ac4/a72+UxuEhfStTJ JZNj2T/vsswYgMKgR0PjLzR3Ite3Ji54T0mYfAQ7KjkbcrAdcCt3PuYpbvDa8LROZ2lc EyICxmWWMI2sjqcdtWdj2MkwFpo2yU++mk6pc= Thanks for this. However, why then are there 4 binary types : x86, x86_64, ppc32 and ppc64 when the kernel itself is a 32-bit. Will it be able to take advantage of the other 32-bits ? On Wed, Aug 19, 2009 at 3:30 PM, Jean-Daniel Dupas<devlists(a)shadowlab.org> wrote: > > Le 19 août 2009 à 11:53, rohan a a écrit : > >> Hi All, >> Does Mac OS X 10.5 provide separate 32-bit and 64-bit kernels >> ?Or there is only one type of kernel supported. >> >> What I mean is that like Windows has separate version x86, x86_64, IA >> is there something like this for Mac OS X 10.5 as well ? >> >> If not are there only 2 version: >> Intel i386 and PowerPC ? >> >> and does the same thing run on 32-bit and 64-bit hardware ? > > Most (if not all) of the answers are in the 64 bit Transition Guide and in > The Universal Binary programming Guide. > > http://developer.apple.com/documentation/Darwin/Conceptual/64bitPorting/int… > > http://developer.apple.com/documentation/MacOSX/Conceptual/universal_binary… > > > > _______________________________________________ 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: 64-bit Mac OS X kernel
by Jean-Daniel Dupas 19 Aug '09

19 Aug '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Le 19 août 2009 à 11:53, rohan a a écrit : Hi All, Does Mac OS X 10.5 provide separate 32-bit and 64-bit kernels ?Or there is only one type of kernel supported. What I mean is that like Windows has separate version x86, x86_64, IA is there something like this for Mac OS X 10.5 as well ? If not are there only 2 version: Intel i386 and PowerPC ? http://developer.apple.com/documentation/Darwin/Conceptual/64bitPorting/int… http://developer.apple.com/documentation/MacOSX/Conceptual/universal_binary… _______________________________________________ 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… and does the same thing run on 32-bit and 64-bit hardware ? Most (if not all) of the answers are in the 64 bit Transition Guide and in The Universal Binary programming Guide. This email sent to site_archiver(a)lists.apple.com

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Re: 64-bit Mac OS X kernel
by Mo McRoberts 19 Aug '09

19 Aug '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Wed, Aug 19, 2009 at 10:53, rohan a<info1686(a)gmail.com> wrote: > Hi All, > Does Mac OS X 10.5 provide separate 32-bit and 64-bit kernels > ?Or there is only one type of kernel supported. Under 10.5 (we can’t discuss 10.6 on this list), there is only one kernel, which runs both 32-bit and 64-bit binaries. Although it actually contains a 64-bit version of the code under 10.5.8, I don't think it's ever actually booted as a 64-bit kernel outside of Apple’s internal development labs. [mo@pip ~]$ file /mach_kernel /mach_kernel: Mach-O universal binary with 3 architectures /mach_kernel (for architecture x86_64): Mach-O 64-bit executable x86_64 /mach_kernel (for architecture i386): Mach-O executable i386 /mach_kernel (for architecture ppc): Mach-O executable ppc > What I mean is that like Windows has separate version x86, x86_64, IA > is there something like this for Mac OS X 10.5 as well ? > > If not are there only 2 version: > Intel i386 and PowerPC ? Just one. > and does the same thing run on 32-bit and 64-bit hardware ? Yes. -- http://nevali.net _______________________________________________ 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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64-bit Mac OS X kernel
by rohan a 19 Aug '09

19 Aug '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:date:message-id:subject :from:to:content-type:content-transfer-encoding; bh=C23DU8CLRW2rtV/HxTtBk7niJWRSAFT8E/KJb37c4V0=; b=MSJkO8PkoeAqpLuYExLN1PT0MuUAnWGPUMBcly14mQYOV3Ymmw+AZxbx6PxlzIyZjR WugLEedwEnLcT+GnFJtVCkdm2P4ZTkeCsq3vHBmTu8en6/Cx9rQ5wpkcgc00C/5as/yq ixk7NC2gMp/orr5GnYlqoMItP1AgE6j/z60Fk= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type :content-transfer-encoding; b=JEEjW6Km52FLFQhxlYzo8nXfSBCbxSiFxZU+WXoh/8LymLdrZc7vBog44o3lo9xfS0 jic7OylPFkN1bDbEii93YHYpu75lwgsn+zxPG3Za17QUdeWrCI4YIBZle6AtTIRr13K4 jWeCjmIl4M03f2RlVBTIM+JJU2gO8/vE7sOpw= Hi All, Does Mac OS X 10.5 provide separate 32-bit and 64-bit kernels ?Or there is only one type of kernel supported. What I mean is that like Windows has separate version x86, x86_64, IA is there something like this for Mac OS X 10.5 as well ? If not are there only 2 version: Intel i386 and PowerPC ? and does the same thing run on 32-bit and 64-bit hardware ? Thanks _______________________________________________ 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: which pages of the file are in the cache
by Mo McRoberts 19 Aug '09

19 Aug '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Wed, Aug 19, 2009 at 08:56, Jean-Daniel Dupas<devlists(a)shadowlab.org> wrote: > For the record, the best place to find about case and spacing is the "Apple > Publication Style Guide" > > http://developer.apple.com/documentation/userexperience/conceptual/APStyleG… In general, yes, but there’s an easier way for this particular term if you actually use a Mac. Apple Menu > “Mac OS X Software…”. And, if you need more proof, you can always select “About this Mac” which presents the name of the OS in big letters beneath the shiny Apple logo ;) M. -- http://nevali.net _______________________________________________ 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: which pages of the file are in the cache
by Jean-Daniel Dupas 19 Aug '09

19 Aug '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Le 19 août 2009 à 07:51, Steve Checkoway a écrit : On Aug 18, 2009, at 16:39, Michael Smith <msmith(a)freebsd.org> wrote: http://developer.apple.com/documentation/userexperience/conceptual/APStyleG… _______________________________________________ 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… MacOS X (note correct spacing for those that care)? Close. It's Mac OS X <http://www.apple.com/macosx/> for those _who_ care. =) For the record, the best place to find about case and spacing is the "Apple Publication Style Guide" This email sent to site_archiver(a)lists.apple.com

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Re: which pages of the file are in the cache
by Steve Checkoway 19 Aug '09

19 Aug '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Aug 18, 2009, at 16:39, Michael Smith <msmith(a)freebsd.org> wrote: -- Steve Checkoway _______________________________________________ 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… MacOS X (note correct spacing for those that care)? Close. It's Mac OS X <http://www.apple.com/macosx/> for those _who_ care. =) This email sent to site_archiver(a)lists.apple.com

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Re: which pages of the file are in the cache
by Michael Smith 18 Aug '09

18 Aug '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com _______________________________________________ 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: which pages of the file are in the cache
by Terry Lambert 18 Aug '09

18 Aug '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com -- 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 Aug 18, 2009, at 9:16 AM, Jonas Maebe wrote: On 18 Aug 2009, at 18:08, Terry Lambert wrote: My understanding of the performance issues there are that they are not related to what's in the cache, at least not after the first run, since we will preheat the cache for processes after we know what pages are typically in use. This was true for 10.4, but no longer in 10.5 afaik (see rdar://problem/5139360) . For the non-Apple people: my bug report about the fact that the /var/ vm/app_profile/ directory was never cleaned up under 10.4 (which led to quite a lot of disk usage when performing daily overnight regression testing of a compiler testsuite), was closed with the comment: "There are no application profiles on Leopard. Similar (or better) performance was achieved by using a more flexible read-ahead strategy." We have a specific read-ahead strategy that pre-faults pages into the buffer cache, plus specific compiler and linker options to order the code and data to reduce paging and increase code and data locality. It's possible that a particular degenerate arrangement of code and data in a binary would be able to defeat that. You can avoid that using the -order_file linker option and the - freorder-blocks / -freorder-blocks-and-partition / -freorder- functions. If your build includes dynamic libraries, you can also do - exported_symbols_order, and if you are talking about the main compilation unit and the code is not intended to be used by a plugin, you can also use the -dead_strip option to delete dead code (including any constructors contained in the dead code). This email sent to site_archiver(a)lists.apple.com

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Re: which pages of the file are in the cache
by Terry Lambert 18 Aug '09

18 Aug '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Terry, -- 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 Aug 18, 2009, at 10:53 AM, Joel Reymont wrote: It's actually my understanding that the issue is one of having lots of static constructors which are not precomputed, What is a non-precomputed static constructor and what is a precomputed one? Some compilers also support precomputing the post-constructed value of static class instances, such that the class starts out initialized, rather than having to call the constructor at runtime, which costs compile time but saves start time. If you have a lot of static or global constructors, this can cause considerable overhead constructing things before your program actually starts running. You can find most cases where this might be an issue with -Wglobal-constructors. Based on your optimization level, you will have two options that might be on or off with regard to constructors; one is -fno-elide- constructors, which is my understanding is the case witho no specific optimization enabled. If this setting is in play, then g++ will always create a temporary and use a copy constructor to initialize objects of the same type. The other is the inlining options, which can greatly impact recursive templates. PS: Hopefully, you don't use exceptions or rtti, and can turn them off; otherwise they also cause a lot of overhead. The dwarf stuff that is used for exception unwinding is pretty heavy weight. This email sent to site_archiver(a)lists.apple.com

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