私はnginxがPOSTリクエストを受信し、リクエストの本文をMySqlに配置する小さなPHPスクリプトを持っています。問題は、1秒あたり300のPOSTがある場合のMySqlCPU使用率が非常に高いことです。MySqlは、1秒あたり300回をはるかに超える挿入を処理できる高速なものであると期待していました。私はAmazonEC2スモールインスタンスであるAmazonLinuxを使用しています。
top - 18:27:06 up 3 days, 1:43, 2 users, load average: 4.40, 5.39, 5.76
Tasks: 178 total, 4 running, 174 sleeping, 0 stopped, 0 zombie
Cpu(s): 24.6%us, 13.4%sy, 0.0%ni, 0.0%id, 1.1%wa, 0.0%hi, 4.9%si, 56.0%st
Mem: 1717480k total, 1640912k used, 76568k free, 193364k buffers
Swap: 917500k total, 5928k used, 911572k free, 824136k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
7677 mysql 20 0 313m 153m 6124 S 39.0 9.2 393:49.11 mysqld
16529 nginx 20 0 157m 151m 820 R 15.2 9.0 28:36.50 nginx
29793 php 20 0 36780 3240 1896 S 2.5 0.2 0:00.34 php-fpm
29441 php 20 0 36780 3204 1892 S 2.2 0.2 0:00.78 php-fpm
29540 php 20 0 36780 3204 1900 S 2.2 0.2 0:00.82 php-fpm
29603 php 20 0 36780 3220 1892 S 2.2 0.2 0:00.61 php-fpm
29578 php 20 0 36780 3200 1900 S 1.9 0.2 0:00.42 php-fpm
29950 php 20 0 36780 3192 1900 S 1.9 0.2 0:00.48 php-fpm
30030 php 20 0 36780 3180 1888 S 1.9 0.2 0:00.08 php-fpm
30025 php 20 0 36780 3200 1888 S 1.6 0.2 0:00.11 php-fpm
29623 php 20 0 36780 3184 1892 S 1.3 0.2 0:00.49 php-fpm
29625 php 20 0 36780 3236 1900 S 1.3 0.2 0:00.46 php-fpm
29686 php 20 0 36780 3364 1900 R 1.3 0.2 0:00.51 php-fpm
29863 php 20 0 36780 3184 1892 S 1.3 0.2 0:00.23 php-fpm
30018 php 20 0 36780 3192 1892 S 1.3 0.2 0:00.19 php-fpm
29607 php 20 0 36780 3224 1900 S 1.0 0.2 0:00.42 php-fpm
29729 php 20 0 36780 3180 1888 R 1.0 0.2 0:00.41 php-fpm
これが私のPHPコードです:
<?php
$mysqli=new mysqli("localhost", "root", "", "errorreportsraw");
$project_id=$_REQUEST["project_id"];
$data=$_REQUEST["data"];
$date=date("Y-m-d H-i-s");
$mysqli->query("insert into rawreports(date, data, project_id) values ('$date', '$data', '$project_id')")
?>
mysql_connect、mysql_pconnect、mysqli( "localhost"、...)、mysqli( "p:localhost"、...)を試しました-それでも同じです。これらの挿入を除いて、データベースに対してクエリは実行されていません。
これが私のテーブルです:
CREATE TABLE `rawreports` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`date` datetime NOT NULL,
`data` mediumtext NOT NULL,
`project_id` varchar(100) NOT NULL,
PRIMARY KEY (`id`)
);
後の処理のためにPOSTデータを保存するだけで、インデックスはなく、非常にシンプルです。「データ」フィールドは、ほとんどの場合、約3キロバイトです。innodbとmyisamを試しました-それでも同じです。
これが私のSHOWPROCESSLISTで、複数の挿入以外は何もありません。
mysql> show processlist;
+---------+----------------------+-----------+-----------------+---------+------+------------------+------------------------------------------------------------------------------------------------------+
| Id | User | Host | db | Command | Time | State | Info |
+---------+----------------------+-----------+-----------------+---------+------+------------------+------------------------------------------------------------------------------------------------------+
| 3872248 | root | localhost | NULL | Query | 0 | NULL | show processlist |
| 3901991 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902003 | root | localhost | errorreportsraw | Sleep | 0 | | NULL |
| 3902052 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902053 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902054 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902055 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902056 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902057 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902058 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902059 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902060 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"protocol_version":" |
| 3902061 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902062 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902063 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902064 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902065 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902066 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902067 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902068 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902069 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902070 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902071 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902072 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902073 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902074 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902075 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902076 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902077 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902078 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902079 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902080 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902081 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902082 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902083 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902084 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902085 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902086 | root | localhost | errorreportsraw | Query | 0 | update | insert into rawreports(date, data, project_id) values ('2012-05-05 17-01-37', '{"exceptions":[{"stac |
| 3902087 | unauthenticated user | localhost | NULL | Connect | NULL | Reading from net | NULL |
+---------+----------------------+-----------+-----------------+---------+------+------------------+------------------------------------------------------------------------------------------------------+
39 rows in set (0.00 sec)
サーバーにまだプレッシャーがかかっているときに同じ挿入を手動で行った場合のプロファイルは次のとおりです。
set profiling=1;
insert into rawreports(date, data, project_id) values('2012-05-04 00:58:08','[3000-chars-data-here]','5');
show profile ALL for query 1;
Status Duration CPU_user CPU_system Context_voluntary Context_involuntary Block_ops_in Block_ops_out Messages_sent Messages_received Page_faults_major Page_faults_minor Swaps Sourc
starting 0.000231 0.000000 0.000000 0 0 0 0 0 0 0 0 0 NULL NULL NULL
checking permissions 0.000030 0.000000 0.000000 0 0 0 0 0 0 0 0 0 check_access sql_parse.cc 4745
Opening tables 0.000057 0.001000 0.000000 0 0 0 0 0 0 0 0 0 open_tables sql_base.cc 4836
System lock 0.000030 0.000000 0.000000 0 0 0 0 0 0 0 0 0 mysql_lock_tables lock.cc 299
init 0.000037 0.000000 0.000000 0 0 0 0 0 0 0 0 0 mysql_insert sql_insert.cc 721
update 0.075716 0.001999 0.011998 166 2 0 0 0 0 0 0 0 mysql_insert sql_insert.cc 806
Waiting for query cache lock 0.000087 0.000000 0.000000 0 0 0 0 0 0 0 0 0 lock sql_cache.cc 552
update 0.000037 0.000000 0.000000 0 0 0 0 0 0 0 0 0 NULL NULL NULL
end 0.000024 0.000000 0.000000 0 0 0 0 0 0 0 0 0 mysql_insert sql_insert.cc 1049
query end 0.000042 0.000000 0.000000 0 0 0 0 0 0 0 0 0 mysql_execute_command sql_parse.cc 4434
closing tables 0.000031 0.000000 0.001000 0 0 0 0 0 0 0 0 0 mysql_execute_command sql_parse.cc 4486
freeing items 0.000126 0.000000 0.000000 0 1 0 0 0 0 0 0 0 mysql_parse sql_parse.cc 5634
logging slow query 0.000030 0.000000 0.000000 0 0 0 0 0 0 0 0 0 log_slow_statement sql_parse.cc 1460
cleaning up 0.000024 0.000000 0.000000 0 0 0 0 0 0 0 0 0 dispatch_command sql_parse.cc 1416
MySql5.5.20を使用しています。InnoDBとMyISAMの両方を試しました-どちらも同じです。
これが私のiostat出力です:
# iostat -x
Linux 3.2.12-3.2.4.amzn1.i686 05/15/2012 _i686_ (1 CPU)
avg-cpu: %user %nice %system %iowait %steal %idle
23.67 0.03 18.39 4.09 52.87 0.95
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
xvdap1 0.00 1.74 0.03 0.78 1.50 25.12 32.85 0.01 14.03 5.92 0.48
xvdap3 0.00 0.00 0.01 0.01 0.05 0.08 10.47 0.00 5.72 1.09 0.00
xvdf 0.40 18.59 23.14 117.55 753.12 3465.25 29.98 0.53 3.74 2.38 33.46
最も明白なことは、それらを1つずつではなく、すべて一緒にバッチ挿入してコミットすることです。しかし、すべての挿入は個別のPOSTリクエストであり、個別のPHPスクリプトの実行であるため、これを行うことはできません。それらはすべて同時に実行され、互いに干渉しません。
非常に単純なタスクのようですが、私のCPUは実際に何をしているのでしょうか。mysql、php、linuxの経験はあまりありません。たぶん私は何かが恋しいです。アイデアをありがとう!