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POapache server reached MaxClients setting, consider raising the MaxClients setting
 

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    <p>I am running centos 5.5 with 768mb ram. i keep getting <code>server reached MaxClients setting, consider raising the MaxClients setting</code> in the logs also apache runs really slow. when i look at cacti graphs it shows the server is not even using all the resources.. here is the current configuration</p> <pre><code>&lt;IfModule prefork.c&gt; StartServers 8 MinSpareServers 5 MaxSpareServers 10 ServerLimit 1024 MaxClients 768 MaxRequestsPerChild 4000 &lt;/IfModule&gt; &lt;IfModule worker.c&gt; StartServers 2 MaxClients 150 MinSpareThreads 25 MaxSpareThreads 75 ThreadsPerChild 25 MaxRequestsPerChild 0 &lt;/IfModule&gt; free -m total used free shared buffers cached Mem: 768 352 415 0 0 37 -/+ buffers/cache: 315 452 Swap: 0 0 0 top - 11:03:54 up 41 days, 11:53, 1 user, load average: 0.05, 0.03, 0.00 Tasks: 35 total, 1 running, 34 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 0.0%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.3%st Mem: 786432k total, 389744k used, 396688k free, 0k buffers Swap: 0k total, 0k used, 0k free, 38284k cached </code></pre> <p>I have tried the following but the server responds very slowly</p> <pre><code>&lt;IfModule worker.c&gt; #StartServers 2 #MaxClients 150 #MinSpareThreads 25 #MaxSpareThreads 75 #ThreadsPerChild 25 #MaxRequestsPerChild 0 StartServers 20 MaxClients 1024 ServerLimit 1024 MinSpareThreads 128 MaxSpareThreads 768 ThreadsPerChild 64 MaxRequestsPerChild 0 &lt;/IfModule&gt; free -m total used free shared buffers cached Mem: 768 324 443 0 0 37 -/+ buffers/cache: 286 481 Swap: 0 0 0 </code></pre> <p><img src="https://i.stack.imgur.com/C3q9v.png" alt="enter image description here"></p> <p>@regilero</p> <p>I have updated to </p> <pre><code>&lt;IfModule prefork.c&gt; StartServers 12 MinSpareServers 12 MaxSpareServers 12 MaxClients 50 MaxRequestsPerChild 300 &lt;/IfModule&gt; </code></pre> <p>using top i see</p> <pre><code>Tasks: 36 total, 1 running, 35 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 0.3%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 786432k total, 613180k used, 173252k free, 0k buffers Swap: 0k total, 0k used, 0k free, 76488k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1 root 20 0 10364 92 60 S 0.0 0.0 1:09.53 init 2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd/808 3 root 20 0 0 0 0 S 0.0 0.0 0:00.00 khelper/808 124 root 16 -4 12620 8 4 S 0.0 0.0 0:00.00 udevd 533 root 20 0 95504 5692 228 S 0.0 0.7 4:02.94 memcached 546 root 20 0 5924 332 276 S 0.0 0.0 6:54.51 syslogd 557 root 20 0 101m 1456 868 S 0.0 0.2 13:18.64 snmpd 570 root 20 0 62640 316 208 S 0.0 0.0 2:39.56 sshd 579 root 20 0 21656 24 20 S 0.0 0.0 0:00.00 xinetd 589 root 20 0 12072 12 8 S 0.0 0.0 0:00.05 mysqld_safe 940 mysql 20 0 559m 164m 3832 S 0.3 21.5 209:33.88 mysqld 1015 root 20 0 20880 200 132 S 0.0 0.0 0:10.48 crond 1023 root 20 0 46748 4 0 S 0.0 0.0 0:00.00 saslauthd 1024 root 20 0 46748 4 0 S 0.0 0.0 0:00.00 saslauthd 3605 root 20 0 62832 2168 636 S 0.0 0.3 0:02.58 sendmail 3613 smmsp 20 0 57712 1648 504 S 0.0 0.2 0:00.01 sendmail 17610 root 20 0 85932 3312 2600 S 0.0 0.4 0:00.02 sshd 17612 mcmap 20 0 86072 1760 1012 S 0.0 0.2 0:00.17 sshd 17613 mcmap 20 0 12076 1656 1292 S 0.0 0.2 0:00.01 bash 17637 root 20 0 45052 1432 1120 S 0.0 0.2 0:00.00 su 17638 root 20 0 12180 1800 1324 S 0.0 0.2 0:00.08 bash 17740 root 20 0 246m 9264 4516 S 0.0 1.2 0:00.19 httpd 18264 apache 20 0 282m 43m 4940 S 0.0 5.7 0:00.56 httpd 18514 apache 20 0 279m 40m 4832 S 0.0 5.3 0:01.47 httpd 18518 apache 20 0 273m 36m 4396 S 0.0 4.7 0:00.45 httpd 18528 apache 20 0 251m 13m 3660 S 0.0 1.8 0:00.41 httpd 18529 apache 20 0 278m 40m 4340 S 0.0 5.3 0:00.99 httpd 18530 apache 20 0 278m 40m 4268 S 0.0 5.3 0:00.67 httpd 18548 apache 20 0 272m 33m 3516 S 0.0 4.4 0:00.28 httpd 18552 apache 20 0 280m 42m 3684 S 0.0 5.5 0:00.48 httpd 18553 apache 20 0 271m 33m 3768 S 0.0 4.3 0:00.45 httpd 18555 apache 20 0 274m 36m 3672 S 0.0 4.7 0:00.58 httpd 18572 apache 20 0 247m 9020 2856 S 0.0 1.1 0:00.01 httpd 18578 apache 20 0 280m 42m 3684 S 0.0 5.6 0:00.76 httpd 18589 apache 20 0 246m 5452 676 S 0.0 0.7 0:00.00 httpd 18588 root 20 0 12624 1216 932 R 0.0 0.2 0:00.06 free -m total used free shared buffers cached Mem: 768 578 189 0 0 74 -/+ buffers/cache: 504 263 Swap: 0 0 0 </code></pre> <p><img src="https://i.stack.imgur.com/YObfB.png" alt="enter image description here"> Just added current picture of cacti result last 4 hours. busy periods are monday tuesday. So i will wait till next week to see further results of the config change. but it looks like an improvement as before i only had max 10 threads available. Looking at this do you think i can make more improvment?</p> <pre><code>free -m total used free shared buffers cached Mem: 768 619 148 0 0 49 -/+ buffers/cache: 570 197 Swap: 0 0 0 </code></pre> <p><strong>NEW TEST</strong></p> <p>On a 2GB Ram VPS box i have now set prefork to</p> <pre><code>StartServers 20 MinSpareServers 20 MaxSpareServers 20 ServerLimit 256 MaxClients 256 MaxRequestsPerChild 4000 </code></pre> <p>today morning my memcache server died from</p> <pre><code>Nov 20 09:28:40 vps22899094 kernel: Out of memory: Kill process 12517 (memcached) score 81 or sacrifice child Nov 20 09:28:40 vps22899094 kernel: Killed process 12517, UID 497, (memcached) total-vm:565252kB, anon-rss:42940kB, file-rss:44kB </code></pre> <p>What should the optimal values be to set in apache?</p> <p><strong>#/etc/sysconfig/memcached</strong></p> <pre><code>PORT="11211" USER="memcached" MAXCONN="1024" CACHESIZE="1024" OPTIONS="-l 127.0.0.1" </code></pre> <p><strong>/etc/my.cnf</strong></p> <pre><code>[mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock user=mysql # Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=0 bind-address=127.0.0.1 #script thread_concurrency=2 query_cache_size = 16M query_cache_type=1 query_cache_limit=5M # MyISAM # #key-buffer-size = 32M #myisam-recover = FORCE,BACKUP # SAFETY # #max-allowed-packet = 16M #max-connect-errors = 1000000 # CACHES AND LIMITS # tmp-table-size = 32M max-heap-table-size = 32M #query-cache-type = 0 #query-cache-size = 0 max-connections = 50 thread-cache-size = 16 #open-files-limit = 65535 #table-definition-cache = 1024 #table-open-cache = 2048 # INNODB # #innodb-flush-method = O_DIRECT #innodb-log-files-in-group = 2 #innodb-log-file-size = 5M #innodb-flush-log-at-trx-commit = 1 #innodb-file-per-table = 1 #innodb-buffer-pool-size = 921M # LOGGING # log-error = /var/log/mysqld.log log-queries-not-using-indexes = 1 slow-query-log = 1 slow-query-log-file = /var/log/mysqld-slow.log [mysqld_safe] log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid </code></pre>
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