Re: lug-bg: Otnosno lekciqta za http serverite

[vasil@xxxxxxxxxxx (Vasil Kolev)]

Kolkoto i da e burzo forkvaneto, to thread-vaneto ti garantiram che e
po-burzo :) Realen sluchaj - Apache i aolserver , ediniq e perforked,
drugiq - perthreaded, razlikata v load-a na mashinata e 10 puti ( t.e.
load 3 pri apache, load 0.3 pri aolserver). Da kazhem che aolservera e
pisan malko po-chisto, no 10 puti razlika ne mozhe da se poluchi samo ot
po-chisto pisane :)

On Thu, 17 May 2001, Petko Boukov wrote:

> Ne sym chul vyprosnata lekciq, no tova koeto cheta tuk ne e pravilno.
> To e validno po princip za *nix, no ne i za Linux. Linux kernel-yt
> se gordee s dosta byrzo fork-vane na procesi, ponezhe polzva t.nar.
> copy-on-write ili copy-on-demand, pri koeto procesyt raboti kato
> thread, dokato ne izvyrshi pisane (promqna) nqkyde v pametta. Chak
> togava kernel-yt kopira roditelskata pamet. Eto kakvo dava
> 'man 2 fork':
> 
> Under Linux, fork is implemented using copy-on-write pages, so the
> only penalty incurred by fork is the time and  memory required
> to duplicate the parent's page tables, and to create a unique task
> structure for the child.
> 
> Ako nqkoj iska po-zadylbocheno opisanie na realizaciqta na thread-ove
> i procesi, mozhe da pogledne tuk:
> http://www.kernel.org/pub/linux/docs/LDP/LDP/lki/lki-2.html#ss2.2
> 
> Petko
> 
> 

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