83 lines
3.8 KiB
Plaintext
83 lines
3.8 KiB
Plaintext
From fork-admin@xent.com Mon Sep 2 13:13:38 2002
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From: "Adam L. Beberg" <beberg@mithral.com>
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To: Bill Stoddard <bill@wstoddard.com>
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Cc: "Fork@Xent.Com" <fork@spamassassin.taint.org>
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Subject: RE: Gasp!
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Date: Sun, 1 Sep 2002 16:59:24 -0700 (PDT)
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On Sun, 1 Sep 2002, Bill Stoddard wrote:
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> >
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> > "Red Hat Linux Advanced Server provides many high end features such as:
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> > Support for Asynchronous I/O. Now read I/O no longer needs to stall your
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> > application while waiting for completion."
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>
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> Can you provide a reference? I could find it myself but I'm too lazy.
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Well, i saw it on the Compaq Testdrive site, then had to seriously dig on
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the redhat site... It's in one of their whitepapers...
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http://www.redhat.com/pdf/as/as_rasm.pdf
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> > Could it be? After 20 years without this feature UNIX finally
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> > catches up to
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> > Windows and has I/O that doesnt totally suck for nontrivial apps? No way!
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>
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> Do /dev/poll and FreeBSD's KQ event driven APIs count? IMHO, true async
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> io as implemented by Windows 4.0 and beyond is pretty slick, but the
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> programming model is substantially more complex than programming to an
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> event API like /dev/poll. And true async does not buy much if the
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> system call overhead is low (as it is with Linux).
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I havent used the FBSD poll, as it's not portable, select and poll(still not
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100%) are all that exist in the UNIX world. Redhat of course doesnt count as
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portable either, but it's nice they are trying. The Windows I/O model does
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definately blow the doors off the UNIX one, but then they had select to
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point at in it's suckiness and anything would have been an improvement. UNIX
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is just now looking at it's I/O model and adapting to a multiprocess
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multithreaded world so it's gonna be years yet before a posix API comes out
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of it. Bottom line is the "do stuff when something happens" model turned out
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to be right, and the UNIX "look for something to do and keep looking till
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you find it no matter how many times you have to look" is not really working
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so great anymore.
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- Adam L. "Duncan" Beberg
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http://www.mithral.com/~beberg/
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beberg@mithral.com
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