I am running the admittedly somewhat odd vac command
> phlogiston% vac \
>     -d ... -q \ 
>     -f ... \ 
>     -h ... \ 
>     -e acme/acid/386 -e acme/acid/alpha -e acme/acid/arm \
>     -e acme/acid/mips -e acme/acid/power -e acme/bin/386 \
>     -e acme/bin/alpha -e acme/bin/arm -e acme/bin/mips \
>     -e acme/bin/power -e acme/mail/386 -e acme/mail/alpha \
>     -e acme/mail/arm -e acme/mail/mips -e acme/mail/power \
>     -e sys/man/vol1.ps -e sys/man/vol1.ps.gz -e sys/man/vol1.pdf \
>     LICENSE* NOTICE acme lib rc sys ;
and observe 
> nwf           42696    0:00   0:00    82744K Fstat    vac
which raises the natural question
> What is vac doing with 83 megabytes of RAM!?

Thoughts? :)
--nwf;