Trans wrote:
> mortee, do you think you can run this through a profiler and see what
> you come up with?
Here's what I could produce. I'd gladly say I hope this provides some
meaningful insight to some of you, but the results don't seem to be too
informative...
As you can see, the 40 secs delay (with virtually zero CPU activity) is
spent during the XML::Parser#parse method - but the profiler data for
the same operation shows just a fraction of a second...
mortee
$ head -41 xml-bm-libxml.rb
#!/usr/bin/env ruby
require 'xml/libxml'
require 'benchmark'
require 'ruby-prof'
xml = DATA.read
parserinit_prof = parse_prof = traverse_prof = parser = doc = nil
Benchmark.bm 10 do |b|
b.report('init') do
parserinit_prof = RubyProf.profile do
parser = XML::Parser.string(xml)
end
end
b.report('parse') do
parse_prof = RubyProf.profile do
doc = parser.parse
end
end
b.report('traverse') do
traverse_prof = RubyProf.profile do
doc.find('//data').each{}
end
end
end
puts 'init profile data:'
RubyProf::FlatPrinter.new(parserinit_prof).print
puts 'parse profile data:'
RubyProf::FlatPrinter.new(parse_prof).print
puts 'traverse profile data:'
RubyProf::FlatPrinter.new(traverse_prof).print
__END__
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
$ ./xml-bm-libxml.rb
user system total real
init 0.015000 0.000000 0.015000 ( 0.014000)
parse 0.797000 0.031000 0.828000 ( 40.985000)
traverse 0.094000 0.000000 0.094000 ( 0.101000)
init profile data:
Thread ID: 268683600
Total: 0.015
%self total self wait child calls name
100.00 0.01 0.01 0.00 0.00 1
<Class::XML::Parser>#string
0.00 0.01 0.00 0.00 0.01 0 Global#[No method]
parse profile data:
Thread ID: 268683600
Total: 0.828
%self total self wait child calls name
100.00 0.83 0.83 0.00 0.00 1 XML::Parser#parse
0.00 0.83 0.00 0.00 0.83 0 Global#[No method]
traverse profile data:
Thread ID: 268683600
Total: 0.094
%self total self wait child calls name
67.02 0.06 0.06 0.00 0.00 1
XML::XPath::Object#each
32.98 0.03 0.03 0.00 0.00 1 XML::Document#find
0.00 0.09 0.00 0.00 0.09 0 Global#[No method]
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