Re: autotest speedups

[Paolo Bonzini]

> *Wow!*
>
> 6 seconds (35% speedup) for executing just one test!  And when executing ten 
> tests, 17 seconds speedup!

Wow indeed.  But what are the timings on Linux? :-)

> 1) My patch invokes sed once per test group.  Perhaps we should instead 
> generate a single sed script based on the final value of at_groups, and parse 
> out all relevant shell functions with one pass of sed prior to starting the 
> driver loop.  This has the benefit of fewer sed calls, but the expense of 
> constant memory usage proportional to the size of the subset of tests being run.

I like this, but timing is needed on both cygwin and Linux.

Paolo