On Thu, 31 May 2018 10:14:50 -0700
Han Zhou <zhou...@gmail.com> wrote:
> > +# vec_sub VEC_A VEC_B
> > +#
> > +# Subtracts two vectors:
> > +#
> > +# VEC_A = [a1, a2, ...]
> > +# VEC_B = [b1, b2, ...]
> > +# OUT = [(a1 - b1), (a2 - b2), ...]
> > +#
> > +# VEC_A and VEC_B must be lists of values separated by a character from
> $IFS.
> > +vec_sub() {
> > + local a b i j
> > +
> > + i=0
> > + for a in $1; do
> > + j=0
> > + for b in $2; do
> > + if test $i -eq $j; then
> > + expr $a - $b
> > + break
> > + fi
> > + j=`expr $j + 1`
> > + done
> > + i=`expr $i + 1`
> > + done
>
> The loop is O(n^2) while ideally it can be O(n). I think it is not a big
> deal since it is testing, and I don't have better idea how to achieve O(n)
> while keeping the current convenient input parameters. Just to confirm it
> is not supposed to be used in scalability testing environment to calculate
> counters for thousands of sandboxes, right?
Oh, no, I would not be brave enough to go testing 1000's of sandboxes
with shell scripts. For that scale I would rewrite the whole test to
Python probably.
This is the best I could come up with, w/o going into Bash arrays. It
is intended only for the scale we test at in the automated test suite.
So just a few sandboxes as most.
Thanks for the review,
-Jakub
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