jerodsanto · January 13, 2009 13:20 · Jan 13, 2009
diff --git a/gemweight.rb b/gemweight.rb
@@ -0,0 +1,41 @@
+require 'rubygems'
+require 'benchmark'
+
+gem = ARGV.shift.strip rescue ''
+if gem == ''
+        STDERR.puts "usage: #{$0} [gem]"
+        exit 1
+end
+
+`free`
+if $? != 0
+        STDERR.puts "This program only works on Linux (or other unixes with the \"free\" command)."
+        STDERR.puts "If you can figure out a way to get this to work on OS X, please send me a patch!"
+        exit 1
+end
+
+def free_mem
+        `free -b`.match(/Mem:\s*\d+\s*(\d+)/)[1].to_i
+end
+
+KB = 1024
+MB = 1024 * KB
+GB = 1024 * MB
+
+def bytes(amount)
+        return nil if amount.nil?
+        return "#{amount} bytes" if amount < KB
+        return "#{(amount / KB).round}kb" if amount < MB
+        return "#{(amount / MB).round}MB" if amount < GB
+        return "#{(amount / GB).round}GB"
+end
+
+before = free_mem
+time = Benchmark.measure { require gem }.real
+after = free_mem
+
+used = after - before
+
+time = sprintf("%0.02f", time)
+
+puts "#{gem} uses #{bytes(used)} and takes #{time}s to load"
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