Date: Mon, 9 Feb 1998 12:20:44 +0100 (CET) From: Andrzej Bialecki <abial@nask.pl> To: Dmitrij Tejblum <dima@tejblum.dnttm.rssi.ru> Cc: dyson@FreeBSD.ORG, Mike Smith <mike@smith.net.au>, tlambert@primenet.com, freebsd-current@FreeBSD.ORG, jkh@FreeBSD.ORG Subject: Re: Custom init(8) (and some ideas) Message-ID: <Pine.NEB.3.95.980209121017.16915B-100000@korin.warman.org.pl> In-Reply-To: <199802081336.QAA15578@tejblum.dnttm.rssi.ru>
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On Sun, 8 Feb 1998, Dmitrij Tejblum wrote:
> "John S. Dyson" wrote:
> > I think that I might have misinformed here. Gzipped binaries need swap
> > backing store for each page in the image even for .text section, when
> > physical memory space needs to be freed for another page. Non-gzipped
> > binaries can depend on paging off of the a.out itself. Also, non-gzipped
> > binaries don't have to page out the .text for the initial freeing of the
> > .text space. Gzipped binaries need to page out the .text pages when they
> > are individually freed due to pageout daemon activity. Also, gzipped
> > binaries are not demand-loaded, but are loaded at startup.
>
> Also, (unpacked) .text section of gzipped binaries is not shared among
> several copies of same program, like in case of normal program. If I
> understand correctly, this is a big problem for Andrzej, since all his
> program is crunched together.
Yes, it hurts :-). That's why I conducted several tests with making a
dynamic crunch, to save at least on libraries. But in reality it proved to
take more space in case of minimal system, than statically linked binary
(if you count the size of objects taken from libc for statical linking, it
may be relatively small depending on functions used by program; while when
dynamically linked we have to load the whole libc [ca. 450kB] whether we
use all the parts or not).
It would be very interesting to know (if it's at all possible) how much
space is occupied on running system by libraries only. Is it somehow
related to "shared" pages?
BTW. if someone can use this (I mean, dynamic version of crunched
binaries), I can send a patch to crunchgen - it's trivial anyway. It would
allow for generating both kinds of crunches, depending on a command line
switch.
Andrzej Bialecki
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abial@warman.org.pl | if(halt_per_mth > 0) { fetch("http://www.freebsd.org") }
Research & Academic | "Be open-minded, but don't let your brains to fall out."
Network in Poland | All of the above (and more) is just my personal opinion.
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