Date: Tue, 22 Oct 2002 13:16:49 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: Dan Nelson <dnelson@allantgroup.com> Cc: Danny Braniss <danny@cs.huji.ac.il>, Poul-Henning Kamp <phk@critter.freebsd.dk>, freebsd-hackers@FreeBSD.ORG Subject: Re: malloc Message-ID: <3DB5B231.BCD6E9CA@mindspring.com> References: <E183u5Y-0003Yc-00@cse.cs.huji.ac.il> <3DB50A5A.F87EDA78@mindspring.com> <20021022153347.GA92973@dan.emsphone.com> <3DB5A73C.20513D50@mindspring.com> <20021022194612.GA7165@dan.emsphone.com>
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Dan Nelson wrote: > > The only calls to sbrk have a 0 argument. This is only used to find > > the segment end, so that the mmap's do not occur over top of anything > > important. > > Ah, but take a look at the calls to brk, especially in map_pages() and > free_pages(). How the anonymous pages (which I have already made reference to) are explcitly obtained is irrelevent to the current discussion. If you want me to be exact in terms of implementation details, on both Linux and FreeBSD, I can do so. That isn't the real purpose of the current discussion. The real purpose of this discussion is to defend the choice of FreeBSD, rather than Linux, to users who are strong advocates of Linux. Any answers that don't provide *only* general details on the differences between the systems which lead to the differences in performance behaviour aren't really useful... in fact, they are counter-productive. Yes, this is really nothing more than a "Linux shortage" discussion, where someone has written some bogus code to demonstrate how terrible the world is, without Linux everywhere. ... I have a bad idea <insert "Bad Idea Dance" here>. Why don't you explain how malloc works in excruciating implementation detail, instead of why his program is failing on FreeBSD and not on Linux, so that he gets no real useful comparative information out of the resulting discussion, and everyone reading the archives thinks we bury valid "Linux vs. FreeBSD" questions in technobabble, thus affirming the validity of the original complaint to any third parties who are later referred to the thread as an example of "Why FreeBSD sucks". Then he can throw up his hands in surrender, because no one is willing to speak in the abstract, instead of in terms of implementation details, and switch over to Linux, as his users are demanding he do, since they appear to spend their entire lives looking for degenerate cases that they can use to advocate the the use of Linux in place of whatever other software their administration happens to be using, because they are NOT in fact users being prevented from doing their jobs, they are Linux advocates *pretending* to be users being prevented from doing their jobs by a "severe lack of Linux, God's One True Blessed OS". ... Yes, technically, this discussion should be taking place on -advocacy, but that's not where the question was asked, and it's not where the discussion will be read, and it's not where the results will be archived. And it's not the archive that will be referred to by future advocates who want to make FreeBSD look bad. Moving it will only serve the purpose of placing a question about FreeBSD for which there is "apparently no good answer", for lack of an answer in the archives of the forum (-hackers) in which the question was asked. Thanks, -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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