Slow performance under LOAD

• CentOS Version: CentOS 7
• Centmin Mod Version Installed: Centmin Mod 1.2.3-eva2000.08
• Nginx Version Installed: 1.11.10
• PHP Version Installed: 7.0.0 - Zend opcache v7.0.6-dev
• Persistent Config: No.

As per our chat on lowendtalk, i am having some issues when under high load.

I have installed wordpress via option 22 and went in and disabled all plugins; changed theme to default wordpress theme; enabled w3 total cache.

This is the result of centmin under load: Screenshot

This is the EXACT same VM from Vultr with same spec, standard wordpress install with same plugins and theme. The result is different: Screenshot

 

Thanks for the quick reply mate. Do you think you'll be around in a few hours?

 

Code:

[root@syd2 public]# cat /usr/local/nginx/conf/conf.d/vultr.domain.net.au.conf
# Centmin Mod Getting Started Guide
# must read http://centminmod.com/getstarted.html

# redirect from non-www to www
# uncomment, save file and restart Nginx to enable
# if unsure use return 302 before using return 301
#server {
#            listen   80;
#            server_name vultr.domain.net.au;
#            return 301 $scheme://www.vultr.domain.net.au$request_uri;
#       }

server {
  server_name vultr.domain.net.au www.vultr.domain.net.au;

# ngx_pagespeed & ngx_pagespeed handler
#include /usr/local/nginx/conf/pagespeed.conf;
#include /usr/local/nginx/conf/pagespeedhandler.conf;
#include /usr/local/nginx/conf/pagespeedstatslog.conf;

  # limit_conn limit_per_ip 16;
  # ssi  on;

  access_log /home/nginx/domains/vultr.domain.net.au/log/access.log combined buffer=256k flush=60m;
  error_log /home/nginx/domains/vultr.doamin.net.au/log/error.log;

  root /home/nginx/domains/vultr.dmaoin.net.au/public;

  include /usr/local/nginx/conf/wpsupercache_vultr.domain.net.au.conf;

  location / {

  # Enables directory listings when index file not found
  #autoindex  on;

  # for wordpress super cache plugin
  try_files /wp-content/cache/supercache/$http_host/$cache_uri/index.html $uri $uri/ /index.php?q=$uri&$args;

  # Wordpress Permalinks
  #try_files $uri $uri/ /index.php?q=$uri&$args;

  }

location ~* /(wp-login\.php) {
    limit_req zone=xwplogin burst=1 nodelay;
    #limit_conn xwpconlimit 30;
    auth_basic "Private";
    auth_basic_user_file /home/nginx/domains/vultr.domain.net.au/htpasswd_wplogin;
    include /usr/local/nginx/conf/php-wpsc.conf;
}

location ~* /(xmlrpc\.php) {
    limit_req zone=xwprpc burst=45 nodelay;
    #limit_conn xwpconlimit 30;
    include /usr/local/nginx/conf/php-wpsc.conf;
}

d include /usr/local/nginx/conf/wpsecure_vultr.domain.net.au.conf;
  include /usr/local/nginx/conf/php-wpsc.conf;
  include /usr/local/nginx/conf/staticfiles.conf;
  include /usr/local/nginx/conf/drop.conf;
  #include /usr/local/nginx/conf/errorpage.conf;
  include /usr/local/nginx/conf/vts_server.conf;
}

 

Code:

25 installed plugins:
  I wp-security-scan                4.0.5
  I akismet                         3.3
  I autoptimize                     2.1.0
  I db-cache-reloaded-fix           2.3
  I disable-xml-rpc                 1.0.1
  I go-newrelic                     0.3
  I google-analytics-for-wordpress  6.1.7
  I google-authenticator            0.48
  I gtmetrix-for-wordpress          0.4.2
  I hello                           1.6
  I limit-login-attempts            1.7.1
  I no-longer-in-directory          1.0.60
  I p3-profiler                     1.5.3.9
  I query-monitor                   2.13.4
  I rocket-lazy-load                1.1.1
  I search-regex                    1.4.16
  I addthis-smart-layers            3.0.0
  I sucuri-scanner                  1.8.3
  I tpc-memory-usage                0.9.1
  A w3-total-cache                  0.9.5.2
  I wp-optimize                     2.1.1
  I wp-super-cache                  1.4.9
  I wp-super-cache-clear-cache-menu 1.4
  I wp-updates-notifier             1.4.4
  I wordpress-seo                   4.6

Legend: I = Inactive, A = Active

 

I am on the Vultr Sydney 2GB RAM / 40GB SSD ($10USD per month).

 

And just to be clear on something, this is under any of the high end load testing.. if I simply do individual load testing from my local connection, page loads are around 0.5-0.8s each page.

 

I don't have them infront of me right now as I am not infront of a computer for a few hours. However, off the top of my head it was the first option where it was spread out evenly over 1 minute and min 500 connections is where it started to die. You can do up to 10k connections per minute.

Both serverpilot and centmin had exact test setup.

 

I was just using their free testing option.

 

Yeah correct. I just reinstalled and put centminmod over the sever pilot (obviously fresh install).

 

Okay interesting. I will test out once I get back. Because this only has 1 core - most likely the issue!

 

Awesome. Thanks mate. Can't wait to test it out. Curious, from the stable to beta, what are the biggest bugs which still need ironing out before going into a production environment?

 

Yep, the BETA fixed it That's awesome! And you are 100% right regarding the cache enabler plugin, made a big difference.

P.S - from your own testing, which do you prefer? Cache enabler or redis caching?