Created
February 22, 2010 08:43
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File reading benchmark
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#! ruby19 | |
require 'benchmark' | |
REP = 10 | |
BS = 1024 | |
files = [] | |
at_exit do | |
files.each {|name| File.delete(name) rescue nil} | |
end | |
[100, 1024*1024, 1024*1024*100].each do |s| | |
name = "f-#{s}.bin" | |
File.open(name, File::WRONLY | File::EXCL | File::CREAT | File::BINARY) do |out| | |
data = (".".encode! 'binary') * 1024 | |
while s >= data.bytesize | |
s -= out.write(data) | |
end | |
out.write(data[0, s]) | |
end | |
files << name | |
end | |
Benchmark.bmbm 30 do |r| | |
files.each do |name| | |
r.report name + ' simple' do | |
REP.times do | |
File.open name, "rb" do |io| | |
while b = io.read(BS) | |
end | |
end | |
end | |
end | |
r.report name + ' smart' do | |
REP.times do | |
File.open name, "rb" do |io| | |
b = "" | |
while io.read(BS, b) | |
end | |
end | |
end | |
end | |
r.report name + ' complete' do | |
REP.times do | |
File.open name, "rb" do |io| | |
io.read | |
end | |
end | |
end | |
end | |
end |
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Rehearsal ----------------------------------------------------------------- | |
f-100.bin simple 0.000000 0.000000 0.000000 ( 0.004000) | |
f-100.bin smart 0.016000 0.000000 0.016000 ( 0.005000) | |
f-100.bin complete 0.000000 0.000000 0.000000 ( 0.008000) | |
f-1048576.bin simple 0.094000 0.046000 0.140000 ( 0.133000) | |
f-1048576.bin smart 0.078000 0.016000 0.094000 ( 0.100000) | |
f-1048576.bin complete 0.015000 0.031000 0.046000 ( 0.054000) | |
f-104857600.bin simple 9.031000 3.875000 12.906000 ( 12.913000) | |
f-104857600.bin smart 5.766000 4.047000 9.813000 ( 9.820000) | |
f-104857600.bin complete 0.609000 3.156000 3.765000 ( 3.807000) | |
------------------------------------------------------- total: 26.780000sec | |
user system total real | |
f-100.bin simple 0.016000 0.000000 0.016000 ( 0.007000) | |
f-100.bin smart 0.000000 0.000000 0.000000 ( 0.008000) | |
f-100.bin complete 0.000000 0.000000 0.000000 ( 0.007000) | |
f-1048576.bin simple 0.093000 0.109000 0.202000 ( 0.207000) | |
f-1048576.bin smart 0.078000 0.016000 0.094000 ( 0.103000) | |
f-1048576.bin complete 0.000000 0.046000 0.046000 ( 0.037000) | |
f-104857600.bin simple 8.594000 4.125000 12.719000 ( 12.760000) | |
f-104857600.bin smart 6.219000 3.500000 9.719000 ( 9.721000) | |
f-104857600.bin complete 0.593000 3.125000 3.718000 ( 3.778000) |
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