A little script to take memory profiling output from rdbtool and do some key prefix totalling

total

#!/usr/bin/env ruby

hash = Hash.new{|h,k| h[k] = [0,0]}
aggregate_n = (ARGV[0] || 1).to_i

STDIN.each_line do |line|
  parts = line.split(",")
  key = parts[2][1..-2]
  prefix = key.split(":")[0..(-1-aggregate_n)].join(":")
  size = parts[3]
  hash[prefix][0] += (size.to_i + key.size)
  hash[prefix][1] += 1
end

hash.entries.sort_by{|k,(size,count)| size}.reverse.each do |k,(size,count)|
  puts "#{k}: #{size} (#{count})"
end