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# A small benchmarking file for fancy_read and fast_fancy_read, just to make
# sure the latter deserves its name ;-)...
#
# Now the comparison between fancy_read and fast_fancy_read
require 'Dobjects/Dvector'
require 'benchmark'
require 'stringio'
require 'tempfile'
Benchmark.bm do |x|
# We first create a 'dummy file':
f = Tempfile.new("data")
x.report("data writing(100000):") do
100000.times do |i|
f.puts "#{i*1.0}\t#{i**1.3}\t#{i**0.7}"
end
f.close
end
x.report("fancy_read(100 000):") do
stream = File.open(f.path)
Dobjects::Dvector.fancy_read(stream, nil, 'default'=> 0.0).size
end
x.report("fancy_read(100 000), 2nd time:") do
stream = File.open(f.path)
Dobjects::Dvector.fancy_read(stream, nil, 'default'=> 0.0).size
end
# Trying pre-allocation.
x.report("fancy_read(100 000), preallocation to 1 :") do
stream = File.open(f.path)
Dobjects::Dvector.fancy_read(stream, nil, 'default'=> 0.0,
'initial_size' => 1).size
end
x.report("fancy_read(100 000), preallocation to 49999 :") do
stream = File.open(f.path)
Dobjects::Dvector.fancy_read(stream, nil, 'default'=> 0.0,
'initial_size' => 49999).size
end
x.report("fancy_read(100 000), preallocation to 100 000 :") do
stream = File.open(f.path)
Dobjects::Dvector.fancy_read(stream, nil, 'default'=> 0.0,
'initial_size' => 100000).size
end
# We create a smaller file:
f = Tempfile.new("data")
1000.times do |i|
f.puts "#{i*1.0}\t#{i**1.3}\t#{i**0.7}"
end
f.close
x.report("fancy_read(100 * 1000):") do
100.times do
stream = File.open(f.path)
Dobjects::Dvector.fancy_read(stream, nil, 'default'=> 0.0)
end
end
# We use a StringIO
string = ""
x.report("string creation:") do
50000.times do |i|
string.concat("#{i*1.0}\t#{i**1.3}\t#{i**0.7}\n")
end
end
x.report("fancy_read(50000):") do
stream = StringIO.new(string)
Dobjects::Dvector.fancy_read(stream, nil, 'default'=> 0.0).size
end
end
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