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require 'tempfile'
# A very simple memory profiles that checks the full size of a variable
# by serializing into a binary file.
#
# Yes, I know this is very rough, but there are cases where ObjectSpace.memsize_of
# doesn't cooperate, and this is one of the possible workarounds.
#
# For certain cases, it works (TM).
class ObjectBinsize
def measure(var, label: nil)
dump(var, label: label)
end
def report(var, label: nil, padding: 10)
file = measure(var, label: label)
size = format_integer(file.size)
name = label || File.basename(file.path)
printf("%#{padding}s %s\n", size, name)
end
private
def dump(var, **args)
file = Tempfile.new(args[:label].to_s)
file.write(Marshal.dump(var))
file
ensure
file.close
end
def format_integer(int)
int.to_s.reverse.gsub(/...(?=.)/, '\&,').reverse
end
end
if __FILE__ == $0
prof = ObjectBinsize.new
prof.report(nil, label: "nil")
prof.report(false, label: "false")
prof.report(true, label: "true")
prof.report(0, label: "integer")
prof.report("", label: "empty string")
prof.report({}, label: "empty hash")
prof.report({}, label: "empty array")
prof.report({ foo: "1" }, label: "hash 1 item (symbol)")
prof.report({ foo: "1", bar: 2 }, label: "hash 2 items (symbol)")
prof.report({ "foo" => "1" }, label: "hash 1 item (string)")
prof.report({ "foo" => "1", "bar" => 2 }, label: "hash 2 items (string)")
prof.report("big string" * 200, label: "big string * 200")
end
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