From: "Jan D." <jan.h.d@swipnet.se>
Cc: emacs-devel@gnu.org
Subject: Re: Any idea about what makes Emacs slow reading on pipes?
Date: Fri, 16 May 2003 22:23:00 +0200 [thread overview]
Message-ID: <30294AAC-87DC-11D7-9CFB-00039363E640@swipnet.se> (raw)
In-Reply-To: <x54r3uka7z.fsf@lola.goethe.zz>
> Here is a more elaborate test file
> <testio.el>
> If I run this and print out test-pattern afterwards, I get
>
> test-pattern
...
>
> And from then on (actually backwards in time) only packets with single
> characters, with perhaps 100 filter calls per second.
I think this is a scheduling issue. After all, dd is only reading one
character at a time. I do get some one character reads, but not many.
There is more one character reads on a RedHat 6 than on the Mandrake 9,
not because of some difference in the systems, but because the RedHat
runs on a much slower machine (AMD K6 450Mhz versus AMD Athlon 1400).
For example, if I change to dd bs=1024 count=100, I get no single
character
reads at all. If I raise the priority of dd, I get 1024 consistently
even
on the slower machine.
Jan D.
next prev parent reply other threads:[~2003-05-16 20:23 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-16 13:08 Any idea about what makes Emacs slow reading on pipes? David Kastrup
2003-05-16 13:55 ` Andreas Schwab
2003-05-16 17:18 ` Kevin Rodgers
2003-05-16 17:34 ` David Kastrup
2003-05-16 18:38 ` Kevin Rodgers
2003-05-16 18:49 ` David Kastrup
2003-05-16 17:48 ` Jan D.
2003-05-16 18:38 ` David Kastrup
2003-05-16 20:23 ` Jan D. [this message]
2003-05-16 21:00 ` Andreas Schwab
2003-05-16 23:17 ` Satyaki Das
2003-05-17 1:50 ` Kim F. Storm
2003-05-17 0:34 ` David Kastrup
2003-05-18 0:31 ` Kim F. Storm
2003-05-17 23:07 ` Stefan Monnier
2003-05-17 23:39 ` David Kastrup
2003-05-18 2:09 ` Stefan Monnier
2003-05-18 8:45 ` Kai Großjohann
2003-05-18 10:12 ` David Kastrup
2003-05-18 19:04 ` Richard Stallman
2003-05-18 19:46 ` David Kastrup
2003-05-19 7:33 ` Kai Großjohann
2003-05-19 8:24 ` David Kastrup
2003-05-18 8:46 ` Kai Großjohann
2003-05-18 10:03 ` David Kastrup
2003-05-18 15:09 ` Kai Großjohann
2003-05-18 15:36 ` David Kastrup
2003-05-18 15:50 ` Kai Großjohann
2003-05-18 16:28 ` David Kastrup
2003-05-19 7:26 ` Kai Großjohann
2003-05-19 8:09 ` David Kastrup
2003-05-18 19:03 ` Richard Stallman
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