古いアパッチをなんとかチューニングする４ カーネルパラ触るだけ
カーネルパラメータをいじる
デフォルトままの設定。
mpmもデフォルト
<IfModule mpm_worker_module>
StartServers 2
MaxClients 150
MinSpareThreads 25
MaxSpareThreads 75
ThreadsPerChild 25
MaxRequestsPerChild 0
</IfModule>
1
Concurrency Level: 100
Time taken for tests: 38.576 seconds
Complete requests: 10000
Failed requests: 777
(Connect: 0, Receive: 0, Length: 777, Exceptions: 0)
Write errors: 0
Total transferred: 144226022 bytes
HTML transferred: 141446022 bytes
Requests per second: 259.23 [#/sec] (mean)
Time per request: 385.757 [ms] (mean)
Time per request: 3.858 [ms] (mean, across all concurrent requests)
Transfer rate: 3651.15 [Kbytes/sec] received
2
Concurrency Level: 100
Time taken for tests: 39.264 seconds
Complete requests: 10000
Failed requests: 806
(Connect: 0, Receive: 0, Length: 806, Exceptions: 0)
Write errors: 0
Total transferred: 144216916 bytes
HTML transferred: 141436916 bytes
Requests per second: 254.69 [#/sec] (mean)
Time per request: 392.641 [ms] (mean)
Time per request: 3.926 [ms] (mean, across all concurrent requests)
Transfer rate: 3586.91 [Kbytes/sec] received
3
oncurrency Level: 100
Time taken for tests: 39.463 seconds
Complete requests: 10000
Failed requests: 892
(Connect: 0, Receive: 0, Length: 892, Exceptions: 0)
Write errors: 0
Total transferred: 144189912 bytes
HTML transferred: 141409912 bytes
Requests per second: 253.40 [#/sec] (mean)
Time per request: 394.633 [ms] (mean)
Time per request: 3.946 [ms] (mean, across all concurrent requests)
Transfer rate: 3568.13 [Kbytes/sec] received
値がよくなったのは送り手のカーネルパラメータをいじったため。
ここで適当にぶっこむ
/etc/sysctl.conf
net.ipv4.tcp_max_syn_backlog = 20480
net.core.somaxconn = 20480
net.ipv4.tcp_rmem = 4096 873800 1747600
net.ipv4.tcp_wmem = 4096 873800 1747600
net.ipv4.tcp_mem = 2048000 2048000 2048000
kernel.sem = 250 32000 100 128
fs.file-max = 6815744
fs.aio-max-nr = 1048576
kernel.shmmni = 4096
net.ipv4.ip_local_port_range = 11000 65500
net.core.rmem_default = 1048576
net.core.rmem_max = 4194304
net.core.wmem_default = 262144
net.core.wmem_max = 1048576
vm.swappiness = 0
で
]# /sbin/sysctl -p
apacheも再起動しておく
1.
Concurrency Level: 100
Time taken for tests: 41.083 seconds
Complete requests: 10000
Failed requests: 938
(Connect: 0, Receive: 0, Length: 938, Exceptions: 0)
Write errors: 0
Total transferred: 144175468 bytes
HTML transferred: 141395468 bytes
Requests per second: 243.41 [#/sec] (mean)
Time per request: 410.828 [ms] (mean)
Time per request: 4.108 [ms] (mean, across all concurrent requests)
Transfer rate: 3427.14 [Kbytes/sec] received
2
Concurrency Level: 100
Time taken for tests: 39.346 seconds
Complete requests: 10000
Failed requests: 856
(Connect: 0, Receive: 0, Length: 856, Exceptions: 0)
Write errors: 0
Total transferred: 144201216 bytes
HTML transferred: 141421216 bytes
Requests per second: 254.16 [#/sec] (mean)
Time per request: 393.458 [ms] (mean)
Time per request: 3.935 [ms] (mean, across all concurrent requests)
Transfer rate: 3579.07 [Kbytes/sec] received
3
Concurrency Level: 100
Time taken for tests: 38.429 seconds
Complete requests: 10000
Failed requests: 876
(Connect: 0, Receive: 0, Length: 876, Exceptions: 0)
Write errors: 0
Total transferred: 144194936 bytes
HTML transferred: 141414936 bytes
Requests per second: 260.22 [#/sec] (mean)
Time per request: 384.291 [ms] (mean)
Time per request: 3.843 [ms] (mean, across all concurrent requests)
Transfer rate: 3664.29 [Kbytes/sec] received
あんまかわらん。
Concurrency Level: 200
Time taken for tests: 37.371 seconds
Complete requests: 10000
Failed requests: 509
(Connect: 0, Receive: 0, Length: 509, Exceptions: 0)
Write errors: 0
Total transferred: 144310174 bytes
HTML transferred: 141530174 bytes
Requests per second: 267.59 [#/sec] (mean)
Time per request: 747.411 [ms] (mean)
Time per request: 3.737 [ms] (mean, across all concurrent requests)
Transfer rate: 3771.09 [Kbytes/sec] received
Concurrency Level: 500
Time taken for tests: 56.050 seconds
Complete requests: 10000
Failed requests: 1358
(Connect: 0, Receive: 0, Length: 1358, Exceptions: 0)
Write errors: 0
Total transferred: 144047932 bytes
HTML transferred: 141267654 bytes
Requests per second: 178.41 [#/sec] (mean)
Time per request: 2802.515 [ms] (mean)
Time per request: 5.605 [ms] (mean, across all concurrent requests)
Transfer rate: 2509.74 [Kbytes/sec] received
結局何をしたのか
TIME_WAIT のソケットのリサイクル方法
reuse はプロトコルの概念から安全な方法らしい。recycleはなる早でリサイクルする。色々と問題があると他のページに書いてある。
FIN のタイムアウト時間。攻めの1秒
このあたりのブログから参考に。
Blog Alpha Networking: kernelチューニング
Linux(CentOS6)カーネルチューニングのメモ | ちゃんと覚えておけよ？
ソケット当たりのSYNを受け付けてACKを受け取っていない状態のコネクションの保持可能数
TCPソケットが受け付けた接続要求を格納するキューの最大長を設定。
net.core.somaxconn = 20480
ソケット1つ1つが使うバッファのサイズ。
左から順に min, deault, max.
システム全体で TCP が消費できるメモリの最大値、単位はページとのこと。
min/pressure/max。全部一緒ってどうなるんだこれ。
セマフォ。4つの意味は上のページ参考。でもわからん。
kernel.sem = 250 32000 100 128
共有メモリのセグメント数
kernel.shmmni = 4096
システム全体のファイルディスクリプタの上限
fs.file-max = 6815744
すべてのアクティブな非同期 I/O コンテキスト内で許可されるイベントの最大数。なんやそれ。
この値は同時未処理リクエストを制限するもので、I/Oサブシステムの障害を防ぐために設定する必要があります。
fs.aio-max-nr = 1048576
これはわかるわ。
net.ipv4.ip_local_port_range = 11000 65500
勘所がわからん。
net.core.rmem_default = 1048576
net.core.rmem_max = 4194304
net.core.wmem_default = 262144
net.core.wmem_max = 1048576
スワップすんなよ、ってことか。
vm.swappiness = 0
