| Latency Comparison Numbers (~2012) | |
| ---------------------------------- | |
| L1 cache reference 0.5 ns | |
| Branch mispredict 5 ns | |
| L2 cache reference 7 ns 14x L1 cache | |
| Mutex lock/unlock 25 ns | |
| Main memory reference 100 ns 20x L2 cache, 200x L1 cache | |
| Compress 1K bytes with Zippy 3,000 ns 3 us | |
| Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
| Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |
| <!-- | |
| author Huber Flores | |
| --> | |
| <?xml version="1.0"?> | |
| <!DOCTYPE tsung SYSTEM "/usr/share/tsung/tsung-1.0.dtd"> | |
| <tsung loglevel="notice" version="1.0"> | |
| <!-- Client side setup --> | |
| <clients> |
| /* | |
| * author Huber Flores | |
| */ | |
| # Install on each Node | |
| $ su | |
| # Perl Templating-Toolkit and the Gnu plotting utility to create HTML and graphical reports with the result data set. | |
| $ apt-get install gnuplot-nox libtemplate-perl libhtml-template-perl libhtml-template-expr-perl |
| # appサーバ用の設定 | |
| <source> | |
| type tail | |
| path /var/log/nginx/access.log | |
| format apache | |
| tag nginx.access | |
| pos_file /var/log/td-agent/nginx.pos | |
| </source> | |
| <match nginx.access> |
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script data-main="usage" src="http://requirejs.org/docs/release/1.0.8/comments/require.js"></script> | |
| </head> | |
| <body> | |
| <p>Check your JavaScript console for output!</p> | |
| </body> | |
| </head> |
| #This is the "site config" for nginx | |
| upstream django { | |
| # Distribute requests to servers based on client IP. This keeps load | |
| # balancing fair but consistent per-client. In this instance we're | |
| # only using one uWGSI worker anyway. | |
| ip_hash; | |
| server unix:/tmp/uwsgi.sock; | |
| } | |
| server { |
This gist assumes:
| #! /bin/sh | |
| ### BEGIN INIT INFO | |
| # Provides: carbon-cache | |
| # Required-Start: $remote_fs $syslog | |
| # Required-Stop: $remote_fs $syslog | |
| # Default-Start: 2 3 4 5 | |
| # Default-Stop: 0 1 6 | |
| # Short-Description: carbon-cache init script | |
| # Description: An init script for Graphite's carbon-cache daemon. | |
| ### END INIT INFO |
| #! /bin/sh | |
| # ------------------------------------------------------------------------------ | |
| # SOME INFOS : fairly standard (debian) init script. | |
| # Note that node doesn't create a PID file (hence --make-pidfile) | |
| # has to be run in the background (hence --background) | |
| # and NOT as root (hence --chuid) | |
| # | |
| # MORE INFOS : INIT SCRIPT http://www.debian.org/doc/debian-policy/ch-opersys.html#s-sysvinit | |
| # INIT-INFO RULES http://wiki.debian.org/LSBInitScripts | |
| # INSTALL/REMOVE http://www.debian-administration.org/articles/28 |
| /* | |
| * Updated to use the function-based method described in http://www.phpied.com/social-button-bffs/ | |
| * Better handling of scripts without supplied ids. | |
| * | |
| * N.B. Be sure to include Google Analytics's _gaq and Facebook's fbAsyncInit prior to this function. | |
| */ | |
| (function(doc, script) { | |
| var js, | |
| fjs = doc.getElementsByTagName(script)[0], |
