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Re: Any idea about what makes Emacs slow reading on pipes?
From: |
Jan D. |
Subject: |
Re: Any idea about what makes Emacs slow reading on pipes? |
Date: |
Fri, 16 May 2003 22:23:00 +0200 |
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.
- Any idea about what makes Emacs slow reading on pipes?, David Kastrup, 2003/05/16
- Re: Any idea about what makes Emacs slow reading on pipes?, Jan D., 2003/05/16
- Re: Any idea about what makes Emacs slow reading on pipes?, David Kastrup, 2003/05/16
- Re: Any idea about what makes Emacs slow reading on pipes?,
Jan D. <=
- Re: Any idea about what makes Emacs slow reading on pipes?, Andreas Schwab, 2003/05/16
- Re: Any idea about what makes Emacs slow reading on pipes?, Satyaki Das, 2003/05/16
- Re: Any idea about what makes Emacs slow reading on pipes?, Kim F. Storm, 2003/05/16
- Re: Any idea about what makes Emacs slow reading on pipes?, David Kastrup, 2003/05/16
- Re: Any idea about what makes Emacs slow reading on pipes?, Kim F. Storm, 2003/05/17
- Re: Any idea about what makes Emacs slow reading on pipes?, Stefan Monnier, 2003/05/17
- Re: Any idea about what makes Emacs slow reading on pipes?, David Kastrup, 2003/05/17
- Re: Any idea about what makes Emacs slow reading on pipes?, Stefan Monnier, 2003/05/17
- Re: Any idea about what makes Emacs slow reading on pipes?, Kai Großjohann, 2003/05/18
- Re: Any idea about what makes Emacs slow reading on pipes?, David Kastrup, 2003/05/18