bench_tables.rb

require 'prawn'
require 'benchmark'

LIPSUM = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam urna
  augue, tempor a ornare tempor, blandit in sapien. Cras et purus sit amet eros
  dictum euismod non sed risus. Duis sed commodo felis. Fusce scelerisque
  gravida nunc, nec malesuada elit volutpat eu. Mauris rutrum posuere hendrerit.
  Nulla laoreet semper tristique. Nullam aliquam dignissim auctor. Sed luctus
  posuere ultricies. Proin felis lacus, feugiat eu aliquam vitae, fringilla
  molestie quam."

# Add text and tables of Lipsum with an AFM & TTF font
def basic_pdf
  pdf = Prawn::Document.new

  pdf.font 'Helvetica'
  pdf.text LIPSUM
  pdf.table([[ LIPSUM, LIPSUM ]])

  pdf.font File.join( Prawn::DATADIR, 'fonts', 'Chalkboard.ttf' )
  pdf.text LIPSUM
  pdf.table([[ LIPSUM, LIPSUM ]])

  pdf.render

  #$stdout.write "."
end

def bigger_pdf

end

n = 100

Benchmark.bm do |x|
  x.report("basic_pdf")  { n.times { basic_pdf } }
  #x.report("bigger_pdf") { n.times { bigger_pdf } }
end

gistfile1.txt

Benchmarks at present with MRI 1.9.3-p327 on Mountain Lion

Master (with memory leak)

        user     system      total        real
basic_pdf 18.590000   0.050000  18.640000 ( 18.643244)

------------------------------------------------------

table-memory-leak (without cache)

        user     system      total        real
basic_pdf 18.890000   0.030000  18.920000 ( 18.929270)


------------------------------------------------------

table-memory-leak (with naive metric cache)

        user     system      total        real
basic_pdf 14.820000   0.030000  14.850000 ( 14.857459)