40% slowdown with dynamic /bin/sh

[Jonathan Mini]

I have found that the cost of printing the spew often
slows down compiles measurably, especially when spewing
to an xterm running on a local XFree86 process.  Even
with syscons, this is noticeable.

I generally tend to run my builds behind the screen
port these days, which  helps (screen implements a
virtual display buffer that disconnects screen updates
from the display client and the slave pty).  Another
optimization worth noting is running make -q, which
silences a lot of that spam (urban legend has it that
the synchronization in parallel makes to write the build
messages causes noticeable amounts of contention).

On Nov 29, 2003, at 3:22 PM, Garance A Drosihn wrote:

> I also had some benchmarks of doing 'buildworld' over an
> ssh connection vs doing it at the console.  Oddly enough,
> the ssh connection was faster in some ways and slower in
> others.  I wonder if there is a speed-up by writing to a
> file instead of the console?
-- 
Jonathan Mini
mini at freebsd.org
http://www.freebsd.org