[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: dd does not handle input from pipes correctly (coreutils-5.93)

From: James Youngman
Subject: Re: dd does not handle input from pipes correctly (coreutils-5.93)
Date: Fri, 18 Nov 2005 08:28:30 +0000
User-agent: Mutt/1.5.9i

On Thu, Nov 17, 2005 at 11:55:42PM -0800, Paul Mielke wrote:

> After I sent the bug report, I realized why it was that we suddenly
> started seeing this problem in a script that had been working for
> quite a while:  we just got a new machine that's a dual cpu box
> and are running an MP linux kernel.  The first write to the pipe
> wakes up the reader and he actually gets to run, instead of hanging
> out to dry on the run queue until the writer fills up the pipe buffer
> and blocks.  On a single cpu machine, you would only see the
> problem very rarely (if an interrupt happens to cause a reschedule
> at just the wrong time).

Many systems now include the 'buffer' program (I have it here on an
Ubuntu box).  If you have it, try piping the data through 'buffer -z
4096' (or whatever PIPE_BUF is on your machine if it's not 4096).


reply via email to

[Prev in Thread] Current Thread [Next in Thread]