What about
 notmuch count query1; notmuch count query2; ...
all as a single command issued by notmuch-hello?  That should give exactly
the same output, but eliminates the network round-trips without special
support from count.  It would be interesting to see how this compares with
your modified count and with the current round-trip-per-count approach.

On Sun, Nov 21, 2010 at 4:10 PM, Michal Sojka <sojkam1@fel.cvut.cz> wrote:

> Then we could use something like the following to determine the counts
> of matched messages for saved searches:
>
> $ (echo $query1; echo $query2; ...) | notmuch count --stdin
> <count1>
> <count2>
> ...
>
> -Michal
>