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February 24, 2007

ApacheBench

サーバにベンチを掛けて類推する(安全率、AP使用率も考慮に入れる事)

ad -n [連続アクセス数] -c [同時アクセス数] http://[アクセス先]
ab -n 1000 -c 10 http://www.bangboo.com/index.html

- Requests per second:  23.34 [#/sec] (mean)で、一秒間に23回 → 200万アクセスまでOK
- Time per request:       50.530 [ms]  → 140万アクセスまでOK
- Failed requests:    0 → 失敗がでる同時アクセス、連続アクセスは?

・アクセス先ファイル容量
 Document Length:    19670 bytes

・送信リクエスト数
 Concurrency Level:   10

・リクエスト完了までの所要時間
 Time taken for tests:  50.525910 seconds

・総リクエスト数
 Complete requests:   1000

・取りこぼしたリクエスト数
 Failed requests:    0

・1秒あたりに処理されたリクエスト数
 Requests per second:  23.34 [#/sec] (mean)

・1秒あたりに処理された所要時間
 Time per request:    515.299 [ms] (mean)

・1秒あたりに受信された容量
 Transfer rate:    337.26 [Kbytes/sec] received

・上から順に接続(Connect)、処理(Processing)、待ち時間(Wait)を集計し、最小値、平均、最大値、平均で表している
 Connnection Times (ms)

・処理時間の推移
 Percentage of the requests served within a certain time (ms)

メモリ12GB搭載したSPARC SolarisのサーバでApacheのプロセスを6000個ぐらい上げた猛者もいるが、一般的なLinuxサーバでは700あたりで挙動が不安定になる。非常におおざっぱに言えば、ひとつのサーバ筐体でたかだか700人しか収容できないということ。


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Posted by funa : 07:25 PM | Web | Comment (0) | Trackback (0)


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