24/10/2012
Сейчас я потихоньку занимаюсь своим проектом, когда есть свободное время, и вот недавно встал вопрос о железе для хостинга. Я хочу рассказать о производительности SSD vs RAM Drive vs HDD.
Тесты проводились на компьютере с OS X, 4x4Gb Kingston @ 1333 RAM, Intel Core i3 @ 2.8 Ghz, OCZ Vertex3, HDD Seagate ST3000DM001. OS X установлена на SSD, Ruby с гемами расположены в домашней папке. Я создал Rails приложение с 10.000 записей в sqlite и контроллер со следующим кодом:
@products = Product.all
Rails.cache.clear
Записи на странице не рендерил, подумал что это будет лишним. Дальше связка nginx + unicorn и тестирование нагрузки. Результаты на чтение получились очень странными:
HDD
Document Length: 719 bytes
Concurrency Level: 4
Time taken for tests: 40.510 seconds
Complete requests: 100
Failed requests: 0
Total transferred: 130600 bytes
HTML transferred: 71900 bytes
Requests per second: 2468.54
Transfer rate: 3223.92 kb/s received
Connnection Times (ms)
min avg max
Connect: 0 0 0
Processing: 1193 1596 2400
Total: 1193 1596 2400
RAM disk
Document Length: 719 bytes
Concurrency Level: 4
Time taken for tests: 39.272 seconds
Complete requests: 100
Failed requests: 0
Total transferred: 130600 bytes
HTML transferred: 71900 bytes
Requests per second: 2546.33
Transfer rate: 3325.51 kb/s received
Connnection Times (ms)
min avg max
Connect: 0 0 0
Processing: 366 1546 1645
Total: 366 1546 1645
SSD
Document Length: 719 bytes
Concurrency Level: 4
Time taken for tests: 39.274 seconds
Complete requests: 100
Failed requests: 0
Total transferred: 130600 bytes
HTML transferred: 71900 bytes
Requests per second: 2546.21
Transfer rate: 3325.35 kb/s received
Connnection Times (ms)
min avg max
Connect: 0 0 0
Processing: 398 1546 1627
Total: 398 1546 1627
И для удобства:
Connnection Times (ms) RPS
min avg max
HDD: 1193 1596 2400 2468.54
RAM Disk: 366 1546 1645 2546.33
SSD: 398 1546 1627 2546.21
Тесты на запись получились куда адекватнее. Код тестирования записи:
1.upto(100) do |i|
Product.create do |p|
p.code = rand 10_000
p.name = "name"
p.shown = [true, false].sample
p.description = "text"
end
end
HDD
Document Length: 975 bytes
Concurrency Level: 4
Time taken for tests: 83.542 seconds
Complete requests: 100
Failed requests: 0
Non-2xx responses: 100
Total transferred: 124700 bytes
HTML transferred: 97500 bytes
Requests per second: 1197.00
Transfer rate: 1492.65 kb/s received
Connnection Times (ms)
min avg max
Connect: 0 0 0
Processing: 540 3290 4829
Total: 540 3290 4829
RAM disk
Document Length: 972 bytes
Concurrency Level: 4
Time taken for tests: 13.850 seconds
Complete requests: 100
Failed requests: 0
Non-2xx responses: 100
Total transferred: 124400 bytes
HTML transferred: 97200 bytes
Requests per second: 7220.03
Transfer rate: 8981.72 kb/s received
Connnection Times (ms)
min avg max
Connect: 0 0 0
Processing: 130 545 577
Total: 130 545 577
SSD
Document Length: 974 bytes
Concurrency Level: 4
Time taken for tests: 15.569 seconds
Complete requests: 100
Failed requests: 0
Non-2xx responses: 100
Total transferred: 124600 bytes
HTML transferred: 97400 bytes
Requests per second: 6422.87
Transfer rate: 8002.89 kb/s received
Connnection Times (ms)
min avg max
Connect: 0 0 0
Processing: 183 613 664
Total: 183 613 664
И для удобства:
Connnection Times (ms) RPS
min avg max
HDD: 540 3290 4829 1197.00
RAM Disk: 130 545 577 7220.03
SSD: 183 613 664 6422.87
