Very slow sed...

[Kris Kennaway]

On Wed, Jun 20, 2007 at 10:24:01AM -0400, David Cross wrote:

> Machine 2:
> time sed -f 
> /usr/src/gnu/usr.bin/groff/tmac/../../../../contrib/groff/tmac/strip.sed 
> /usr/src/gnu/usr.bin/groff/tmac/../../../../contrib/groff/tmac/doc-common 
> >/dev/null
> 
> real    0m4.506s
> user    0m4.167s
> sys     0m0.000s
> 
> Yes... you read that right... almost 400 _TIMES_ slower.  WTF..
> 
> Where should I be looking?

Try ktracing to see what it is doing (although sys time = 0 says it's
all in userland).  So maybe gprof or pmc.  Also double check the
kernel configs are identical and malloc debugging is disabled.

Kris
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