many_objects.rb

require 'benchmark'
require_relative '../lib/odb'

$db = ODB.new

class MyObj
  attr_accessor :__serialize_key__
  include ODB::Persistent
end

def create_objs
  TIMES.times {|i| MyObj.new.tap {|o| o.__serialize_key__ = "obj#{i}".to_sym } }
end

TIMES = 100_000
Benchmark.bmbm do |x|
  x.report("nonpersisted") { create_objs }
  x.report("persisted   ") { $db.transaction { create_objs } }
end

__END__
Rehearsal ------------------------------------------------
nonpersisted   0.340000   0.010000   0.350000 (  0.359124)
persisted      0.290000   0.010000   0.300000 (  0.290687)
--------------------------------------- total: 0.650000sec

                   user     system      total        real
nonpersisted   0.250000   0.000000   0.250000 (  0.246094)
persisted      0.280000   0.000000   0.280000 (  0.289827)