Created
October 28, 2016 09:03
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rmとddのベンチマーク
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#!/usr/bin/env ruby | |
# -*- coding: utf-8 -*- | |
# 以下2つのプロセスを用意して、同時に実行 | |
# 1つ目のプロセスで1MBのファイルを40000個削除する | |
# 2つ目のプロセスでddで/dev/zeroから1GBファイルをディスクにwrite | |
# * 40000ファイルrmとddを同時に行う(チョークなし)実験結果 | |
# 1. 1073741824 bytes (1.1 GB) copied, 13.3225 s, 80.6 MB/s | |
# 2. 1073741824 bytes (1.1 GB) copied, 14.1681 s, 75.8 MB/s | |
# 3. 1073741824 bytes (1.1 GB) copied, 14.2344 s, 75.4 MB/s | |
# 4. 1073741824 bytes (1.1 GB) copied, 13.2137 s, 81.3 MB/s | |
# 5. 1073741824 bytes (1.1 GB) copied, 14.33 s, 74.9 MB/s | |
# 平均: 77.60 MB/s | |
# * 40000rmとddを同時に行う(rm側にチョークあり, 1ファイル消すごとに50ms)実験結果 | |
# 1. 1073741824 bytes (1.1 GB) copied, 15.1325 s, 71.0 MB/s | |
# 2. 1073741824 bytes (1.1 GB) copied, 17.3953 s, 61.7 MB/s | |
# 3. 1073741824 bytes (1.1 GB) copied, 16.9412 s, 63.4 MB/s | |
# 4. 1073741824 bytes (1.1 GB) copied, 17.0393 s, 63.0 MB/s | |
# 5. 1073741824 bytes (1.1 GB) copied, 17.2306 s, 62.3 MB/s | |
# 平均: 64.28 MB/s | |
# $ cat /sys/block/sda/queue/scheduler | |
# noop [deadline] cfq | |
TARGET_DIR = "/tmp/rmbench" | |
NUM_OF_FILES = 40000 | |
CHOKE_DELETE = false | |
def run | |
puts "prepare #{NUM_OF_FILES} files in #{TARGET_DIR}..." | |
prepare_many_files(NUM_OF_FILES) | |
puts "done" | |
puts "start benchmark" | |
pid = Process.fork { | |
# 子プロセスの処理 | |
# 1000ファイル削除 | |
do_rm_many_files(NUM_OF_FILES) | |
puts "done rm files" | |
} | |
do_stress_io | |
puts "done dd" | |
Process.kill(:INT, pid) | |
Process.waitpid pid | |
end | |
def prepare_many_files(numoffiles) | |
`rm -rf #{TARGET_DIR}/*` | |
ary = [].fill(1, 0..(1024 * 1024)) | |
packed = ary.pack('C*') | |
numoffiles.times{|id| | |
File.open("#{TARGET_DIR}/#{id}", "wb") do |file| | |
file.write(packed) | |
end | |
} | |
end | |
def do_rm_many_files(numoffiles) | |
## ret = `rm -rf /tmp/rmbench/*` | |
## p ret | |
numoffiles.times{|id| | |
File.delete("#{TARGET_DIR}/#{id}") | |
if CHOKE_DELETE | |
sleep(0.05) | |
end | |
} | |
end | |
def gracefile_rm_many_files(numoffiles) | |
end | |
def do_stress_io | |
ret = `time dd if=/dev/zero of=/tmp/hdparm_write.tmp ibs=1M obs=1M count=1024 oflag=dsync,direct` | |
end | |
run |
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