run like `./tokumx-compression-estimator.sh /data/db/test.3` and it'll print out the compression ratio you can expect by migrating from MongoDB to TokuMX

tokumx-compression-estimator.sh

#!/bin/bash

usage() {
    echo 1>&2 "usage: $0 [--bnsize=BYTES[K]] /path/to/file.N"
}
bnsize=64K
while [ $# -gt 1 ] ; do
    arg=$1; shift
    if [[ $arg =~ --(.*)=(.*) ]] ; then
        k=${BASH_REMATCH[1]}; v=${BASH_REMATCH[2]}
        eval $k=$v
    else
        usage; exit 1;
    fi
done
case $1 in
    /*) file=$1 ;;
    *) file=$PWD/$1 ;;
esac
rm -rf /tmp/tokumx-compression-estimate
mkdir -p /tmp/tokumx-compression-estimate
cd /tmp/tokumx-compression-estimate
split -d -b$bnsize $file chunks.
gzip chunks.*
gzip -l chunks.*