我们的 Debian Linux 服务器上有一个奇怪的情况。
我们的麻烦/问题/疑问：
如果某个访问者调用该网站 - Apache 收到访问者的请求并停留在其上大约 1-20 秒（对于第一个请求），然后可能会处理一些其他（随机）对象（图像、java 脚本、html、php 和其他加载的对象）文件）在同一会话期间同一网站的静态和动态内容。无论是调用静态图片/图像还是带有数据库请求的动态 php 文件都没有关系。
PM2（套接字node.js）中也是如此。它只是像 Apache 一样，在服务器-客户端消息之间时不时地卡住。
结果，网站加载时间超过一分钟，而两周前还不到 1.2 秒。
日志中没有错误...
在客户端“等待” TTFB 之前，我的服务器上的 Apache Web 服务器正在做什么？
有关服务器的一些信息：
软件 RAID1 中的两个 HDD SATA /dev/sda 和 /dev/sdb。 （所有 RAID1 测试和 HDD 测试均良好，所有 HDD 均正常）
在运行应用程序的服务器上：Apache2、nginx（作为静态内容的反向代理）、本地 MySQL（MyISAM + InnoDB）、本地 MongoDB 和 PM2（套接字 node.js）。网络路由、网卡和 DNS 100% 正常。每天约有 10000 名游客。
我们已经尝试过 Apache 的 strace，但是数据太多（大约 5 秒超过 1Gb），并且我们无法在其他线程之间找到用于系统调用的线程。
Linux host 3.2.0-4-amd64 #1 SMP Debian 3.2.60-1+deb7u3 x86_64 GNU/Linux
PHP 作为 Apache 模块运行。
RAID1状态：
# cat /proc/mdstat
Personalities : [raid1]
md2 : active raid1 sda3[2] sdb3[1]
1936077760 blocks super 1.2 [2/2] [UU]
md1 : active raid1 sda2[2] sdb2[1]
523968 blocks super 1.2 [2/2] [UU]
md0 : active raid1 sda1[2] sdb1[1]
16768896 blocks super 1.2 [2/2] [UU]
unused devices: <none>
硬盘健康状况：
# smartctl -H /dev/sdb
smartctl 5.41 2011-06-09 r3365 [x86_64-linux-3.2.0-4-amd64] (local build)
Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net
=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED
# smartctl -H /dev/sda
smartctl 5.41 2011-06-09 r3365 [x86_64-linux-3.2.0-4-amd64] (local build)
Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net
=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED
两个数据库系统（Mongo 和 MySQL）上的日志记录在其配置中均已停用，但它在 EXT4 文件系统上工作。
以下是有关运行具有最高 IO 的进程的一些数据：
15:13:51 15313 be/4 mongodb 0.00 K/s 39.51 K/s 0.00 % 0.02 % mongod_config --config /etc/mongod_config.conf
15:13:51 27418 be/4 root 0.00 K/s 11.85 K/s 0.00 % 0.00 % rsyslogd -c5
15:13:53 339 be/3 root 0.00 K/s 382.84 K/s 0.00 % 10.95 % [jbd2/md2-8]
15:13:55 25191 be/4 nginx 27.46 K/s 0.00 K/s 0.00 % 0.90 % nginx: worker process
15:13:55 27418 be/4 root 0.00 K/s 15.69 K/s 0.00 % 0.00 % rsyslogd -c5
15:13:55 27801 be/4 mongodb 0.00 K/s 23.54 K/s 0.00 % 0.00 % mongod --config /etc/mongod.conf
15:13:56 339 be/3 root 0.00 K/s 165.80 K/s 0.00 % 13.04 % [jbd2/md2-8]
15:13:56 27418 be/4 root 0.00 K/s 11.84 K/s 0.00 % 0.00 % rsyslogd -c5
15:14:01 339 be/3 root 0.00 K/s 391.00 K/s 0.00 % 7.43 % [jbd2/md2-8]
15:14:01 27418 be/4 root 0.00 K/s 19.75 K/s 0.00 % 0.00 % rsyslogd -c5
15:14:02 339 be/3 root 0.00 K/s 228.93 K/s 0.00 % 14.90 % [jbd2/md2-8]
15:14:02 15059 be/4 mysql 0.00 K/s 15.79 K/s 0.00 % 0.04 % mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306
15:14:02 27627 be/4 mongodb 0.00 K/s 19.74 K/s 0.00 % 0.00 % mongod --config /etc/mongod.conf
15:14:03 27418 be/4 root 0.00 K/s 11.84 K/s 0.00 % 0.00 % rsyslogd -c5
15:14:03 27587 be/4 www-data 0.00 K/s 702.42 K/s 0.00 % 0.00 % apache2 -k start
15:14:03 27589 be/4 mongodb 0.00 K/s 966.81 K/s 0.00 % 0.00 % mongod --config /etc/mongod.conf
15:14:05 14959 be/4 mysql 0.00 K/s 236.84 K/s 0.00 % 0.09 % mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306
15:14:06 339 be/3 root 0.00 K/s 197.61 K/s 0.00 % 46.68 % [jbd2/md2-8]
15:14:06 14959 be/4 mysql 0.00 K/s 529.58 K/s 0.00 % 0.39 % mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306
15:14:06 27418 be/4 root 0.00 K/s 11.86 K/s 0.00 % 0.00 % rsyslogd -c5
15:14:07 339 be/3 root 0.00 K/s 138.08 K/s 0.00 % 12.15 % [jbd2/md2-8]
15:14:07 18365 be/4 mysql 0.00 K/s 11.84 K/s 0.00 % 0.04 % mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306
15:14:10 25191 be/4 nginx 15.79 K/s 0.00 K/s 0.00 % 2.99 % nginx: worker process
15:14:11 25192 be/4 nginx 39.48 K/s 3.95 K/s 0.00 % 2.77 % nginx: worker process
15:14:11 25199 be/4 nginx 19.74 K/s 0.00 K/s 0.00 % 0.69 % nginx: worker process
15:14:11 25194 be/4 nginx 23.69 K/s 3.95 K/s 0.00 % 0.01 % nginx: worker process
15:14:12 339 be/3 root 0.00 K/s 464.09 K/s 0.00 % 6.12 % [jbd2/md2-8]
15:14:14 27418 be/4 root 0.00 K/s 11.84 K/s 0.00 % 0.00 % rsyslogd -c5
15:14:14 27605 be/4 mongodb 0.00 K/s 23.69 K/s 0.00 % 0.00 % mongod --config /etc/mongod.conf
15:14:16 339 be/3 root 0.00 K/s 244.83 K/s 0.00 % 38.10 % [jbd2/md2-8]
15:14:16 14959 be/4 mysql 0.00 K/s 418.59 K/s 0.00 % 0.32 % mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306
15:14:16 27342 be/4 mongodb 0.00 K/s 15.80 K/s 0.00 % 0.00 % mongod --config /etc/mongod.conf
15:14:18 27418 be/4 root 0.00 K/s 15.80 K/s 0.00 % 0.00 % rsyslogd -c5
15:14:20 27398 be/4 mongodb 0.00 K/s 27.10 K/s 0.00 % 0.00 % mongod --config /etc/mongod.conf
15:14:21 339 be/3 root 0.00 K/s 402.19 K/s 0.00 % 9.45 % [jbd2/md2-8]
15:14:21 27328 be/4 www-data 0.00 K/s 11.83 K/s 0.00 % 0.00 % apache2 -k start
15:14:22 25192 be/4 nginx 23.72 K/s 0.00 K/s 0.00 % 0.41 % nginx: worker process
15:14:22 27595 be/4 www-data 0.00 K/s 11.86 K/s 0.00 % 0.00 % apache2 -k start
15:14:23 339 be/3 root 0.00 K/s 307.91 K/s 0.00 % 10.74 % [jbd2/md2-8]
15:14:23 27549 be/4 mongodb 0.00 K/s 15.79 K/s 0.00 % 0.00 % mongod --config /etc/mongod.conf
15:14:25 339 be/3 root 0.00 K/s 247.60 K/s 0.00 % 9.74 % [jbd2/md2-8]
15:14:25 27388 be/4 mongodb 0.00 K/s 27.51 K/s 0.00 % 0.00 % mongod --config /etc/mongod.conf
15:14:26 339 be/3 root 0.00 K/s 90.01 K/s 0.00 % 33.82 % [jbd2/md2-8]
15:14:26 25195 be/4 nginx 15.65 K/s 0.00 K/s 0.00 % 1.71 % nginx: worker process
15:14:26 14959 be/4 mysql 0.00 K/s 508.77 K/s 0.00 % 0.34 % mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306
15:14:27 25195 be/4 nginx 0.00 K/s 11.62 K/s 0.00 % 0.00 % nginx: worker process
15:14:30 15313 be/4 mongodb 0.00 K/s 35.57 K/s 0.00 % 0.04 % mongod_config --config /etc/mongod_config.conf
15:14:31 339 be/3 root 0.00 K/s 351.53 K/s 0.00 % 4.41 % [jbd2/md2-8]
15:14:33 339 be/3 root 0.00 K/s 43.37 K/s 0.00 % 7.53 % [jbd2/md2-8]
15:14:33 15059 be/4 mysql 0.00 K/s 11.83 K/s 0.00 % 0.04 % mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306
15:14:33 27794 be/4 mongodb 0.00 K/s 15.77 K/s 0.00 % 0.00 % mongod --config /etc/mongod.conf
15:14:33 27835 be/4 mongodb 0.00 K/s 11.83 K/s 0.00 % 0.00 % mongod --config /etc/mongod.conf
15:14:34 339 be/3 root 0.00 K/s 106.56 K/s 0.00 % 12.32 % [jbd2/md2-8]
15:14:34 14977 be/4 mysql 0.00 K/s 11.84 K/s 0.00 % 0.06 % mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306
15:14:34 27418 be/4 root 0.00 K/s 15.79 K/s 0.00 % 0.00 % rsyslogd -c5
15:14:37 339 be/3 root 0.00 K/s 242.20 K/s 0.00 % 8.01 % [jbd2/md2-8]
15:14:37 25195 be/4 nginx 11.72 K/s 0.00 K/s 0.00 % 1.01 % nginx: worker process
15:14:37 14977 be/4 mysql 0.00 K/s 11.72 K/s 0.00 % 0.04 % mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306
15:14:37 27634 be/4 www-data 0.00 K/s 15.63 K/s 0.00 % 0.00 % apache2 -k start
15:14:37 27636 be/4 mongodb 0.00 K/s 19.53 K/s 0.00 % 0.00 % mongod --config /etc/mongod.conf
15:14:37 27842 be/4 www-data 0.00 K/s 11.72 K/s 0.00 % 0.00 % apache2 -k start
15:14:39 27418 be/4 root 0.00 K/s 11.77 K/s 0.00 % 0.00 % rsyslogd -c5
15:14:39 27849 be/4 mongodb 0.00 K/s 31.39 K/s 0.00 % 0.00 % mongod --config /etc/mongod.conf
15:14:41 27801 be/4 mongodb 118.35 K/s 43.39 K/s 0.00 % 1.34 % mongod --config /etc/mongod.conf
15:14:41 22209 be/4 mysql 0.00 K/s 11.83 K/s 0.00 % 0.00 % mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306
15:14:44 339 be/3 root 0.00 K/s 541.22 K/s 0.00 % 51.74 % [jbd2/md2-8]
15:14:44 14959 be/4 mysql 0.00 K/s 1335.27 K/s 0.00 % 0.85 % mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306
15:14:44 18604 be/4 mysql 0.00 K/s 11.85 K/s 0.00 % 0.16 % mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306
15:14:45 25195 be/4 nginx 23.68 K/s 0.00 K/s 0.00 % 0.90 % nginx: worker process
15:14:46 339 be/3 root 0.00 K/s 327.37 K/s 0.00 % 9.90 % [jbd2/md2-8]
15:14:46 18362 be/4 mysql 0.00 K/s 11.83 K/s 0.00 % 0.05 % mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306
15:14:46 27800 be/4 mongodb 0.00 K/s 11.83 K/s 0.00 % 0.00 % mongod --config /etc/mongod.conf
15:14:47 339 be/3 root 0.00 K/s 46.87 K/s 0.00 % 7.34 % [jbd2/md2-8]
15:14:47 18504 be/4 mysql 0.00 K/s 15.62 K/s 0.00 % 0.06 % mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306
15:14:50 27867 be/4 mongodb 0.00 K/s 23.64 K/s 0.00 % 0.00 % mongod --config /etc/mongod.conf
来自 Apache 配置：
<IfModule mpm_prefork_module>
StartServers 7
MinSpareServers 7
MaxSpareServers 15
ServerLimit 1024
MaxClients 1024
MaxRequestsPerChild 10000
</IfModule>
更新1 （附加信息）
# iostat
Linux 3.2.0-4-amd64 (host) 08/19/2018 _x86_64_ (8 CPU)
avg-cpu: %user %nice %system %iowait %steal %idle
8.86 0.00 3.80 1.02 0.00 86.32
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
sdb 96.78 3093.98 498.35 2022098528 325699718
sda 96.09 3085.66 498.35 2016660127 325699718
md0 0.01 0.01 0.02 4002 10552
md1 0.05 0.02 0.05 13068 32539
md2 88.37 252.24 496.79 164852095 324679412
# cat /etc/fstab
proc /proc proc defaults 0 0
/dev/md/0 none swap sw 0 0
/dev/md/1 /boot ext3 defaults 0 0
/dev/md/2 / ext4 defaults 0 0
更新2 （附加信息）
# dmesg -T
.....
.....
[Sun Aug 19 17:03:28 2018] type=1300 audit(1534691393.580:36049): arch=c000003e syscall=54 success=yes exit=0 a0=3 a1=0 a2=40 a3=17344e0 items=0 ppid=16922 pid=16923 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="iptables" exe="/sbin/xtables-multi" key=(null)
[Sun Aug 19 17:04:14 2018] type=1325 audit(1534691439.884:36050): table=filter family=2 entries=85
[Sun Aug 19 17:04:14 2018] type=1300 audit(1534691439.884:36050): arch=c000003e syscall=54 success=yes exit=0 a0=3 a1=0 a2=40 a3=1b12660 items=0 ppid=16956 pid=16957 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="iptables" exe="/sbin/xtables-multi" key=(null)
[Sun Aug 19 17:05:02 2018] type=1325 audit(1534691487.740:36051): table=filter family=2 entries=86
[Sun Aug 19 17:05:02 2018] type=1300 audit(1534691487.740:36051): arch=c000003e syscall=54 success=yes exit=0 a0=3 a1=0 a2=40 a3=1f417d0 items=0 ppid=16993 pid=16994 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="iptables" exe="/sbin/xtables-multi" key=(null)
[Sun Aug 19 17:09:19 2018] CPU7: Core power limit notification (total events = 11377)
[Sun Aug 19 17:09:19 2018] CPU1: Core power limit notification (total events = 11377)
[Sun Aug 19 17:09:19 2018] CPU4: Core power limit notification (total events = 11377)
[Sun Aug 19 17:09:19 2018] CPU3: Core power limit notification (total events = 11377)
[Sun Aug 19 17:09:19 2018] CPU5: Core power limit notification (total events = 11377)
[Sun Aug 19 17:09:19 2018] CPU0: Core power limit notification (total events = 11377)
[Sun Aug 19 17:09:19 2018] CPU2: Core power limit notification (total events = 11377)
[Sun Aug 19 17:09:19 2018] CPU6: Core power limit notification (total events = 11377)
[Sun Aug 19 17:09:19 2018] CPU1: Package power limit notification (total events = 11377)
[Sun Aug 19 17:09:19 2018] CPU4: Package power limit notification (total events = 11377)
[Sun Aug 19 17:09:19 2018] CPU3: Package power limit notification (total events = 11376)
[Sun Aug 19 17:09:19 2018] CPU5: Package power limit notification (total events = 11375)
[Sun Aug 19 17:09:19 2018] CPU0: Package power limit notification (total events = 11376)
[Sun Aug 19 17:09:19 2018] CPU2: Package power limit notification (total events = 11377)
[Sun Aug 19 17:09:19 2018] CPU6: Package power limit notification (total events = 11376)
[Sun Aug 19 17:09:19 2018] CPU7: Package power limit notification (total events = 11377)
[Sun Aug 19 17:09:19 2018] CPU3: Core power limit normal
[Sun Aug 19 17:09:19 2018] CPU0: Core power limit normal
[Sun Aug 19 17:09:19 2018] CPU7: Core power limit normal
[Sun Aug 19 17:09:19 2018] CPU1: Core power limit normal
[Sun Aug 19 17:09:19 2018] CPU5: Core power limit normal
[Sun Aug 19 17:09:19 2018] CPU2: Core power limit normal
[Sun Aug 19 17:09:19 2018] CPU4: Core power limit normal
[Sun Aug 19 17:09:19 2018] CPU6: Core power limit normal
[Sun Aug 19 17:09:19 2018] CPU0: Package power limit normal
[Sun Aug 19 17:09:19 2018] CPU7: Package power limit normal
[Sun Aug 19 17:09:19 2018] CPU1: Package power limit normal
[Sun Aug 19 17:09:19 2018] CPU5: Package power limit normal
[Sun Aug 19 17:09:19 2018] CPU2: Package power limit normal
[Sun Aug 19 17:09:19 2018] CPU4: Package power limit normal
[Sun Aug 19 17:09:19 2018] CPU6: Package power limit normal
[Sun Aug 19 17:09:19 2018] CPU3: Package power limit normal
[Sun Aug 19 17:11:48 2018] type=1325 audit(1534691893.367:36052): table=filter family=2 entries=87
[Sun Aug 19 17:11:48 2018] type=1300 audit(1534691893.367:36052): arch=c000003e syscall=54 success=yes exit=0 a0=3 a1=0 a2=40 a3=185a7d0 items=0 ppid=17942 pid=17943 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="iptables" exe="/sbin/xtables-multi" key=(null)
[Sun Aug 19 17:13:28 2018] type=1325 audit(1534691993.655:36053): table=filter family=2 entries=86
[Sun Aug 19 17:13:28 2018] type=1300 audit(1534691993.655:36053): arch=c000003e syscall=54 success=yes exit=0 a0=3 a1=0 a2=40 a3=950650 items=0 ppid=17983 pid=17984 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="iptables" exe="/sbin/xtables-multi" key=(null)
[Sun Aug 19 17:14:14 2018] type=1325 audit(1534692039.907:36054): table=filter family=2 entries=85
[Sun Aug 19 17:14:14 2018] type=1300 audit(1534692039.907:36054): arch=c000003e syscall=54 success=yes exit=0 a0=3 a1=0 a2=40 a3=1ec14e0 items=0 ppid=18025 pid=18026 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="iptables" exe="/sbin/xtables-multi" key=(null)
[Sun Aug 19 17:15:02 2018] type=1325 audit(1534692087.763:36055): table=filter family=2 entries=84
[Sun Aug 19 17:15:02 2018] type=1300 audit(1534692087.763:36055): arch=c000003e syscall=54 success=yes exit=0 a0=3 a1=0 a2=40 a3=84a360 items=0 ppid=18133 pid=18134 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="iptables" exe="/sbin/xtables-multi" key=(null)
[Sun Aug 19 17:15:28 2018] type=1325 audit(1534692114.219:36056): table=filter family=2 entries=83
[Sun Aug 19 17:15:28 2018] type=1300 audit(1534692114.219:36056): arch=c000003e syscall=54 success=yes exit=0 a0=3 a1=0 a2=40 a3=1280370 items=0 ppid=18243 pid=18244 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="iptables" exe="/sbin/xtables-multi" key=(null)
[Sun Aug 19 17:17:14 2018] type=1325 audit(1534692219.563:36057): table=filter family=2 entries=84
[Sun Aug 19 17:17:14 2018] type=1300 audit(1534692219.563:36057): arch=c000003e syscall=54 success=yes exit=0 a0=3 a1=0 a2=40 a3=189b4e0 items=0 ppid=18389 pid=18390 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="iptables" exe="/sbin/xtables-multi" key=(null)
mysql> show variables like 'thread_cache_size';
+-------------------+-------+
| Variable_name | Value |
+-------------------+-------+
| thread_cache_size | 8 |
+-------------------+-------+
1 row in set (0.00 sec)
mysql> show status like 'Threads%';
+-------------------+-------+
| Variable_name | Value |
+-------------------+-------+
| Threads_cached | 7 |
| Threads_connected | 1 |
| Threads_created | 3082 |
| Threads_running | 1 |
+-------------------+-------+
4 rows in set (0.00 sec)