| # Kernel sysctl configuration file for Red Hat Linux | |
| # | |
| # For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and | |
| # sysctl.conf(5) for more details. | |
| # Turn on execshield | |
| # 0 completely disables ExecShield and Address Space Layout Randomization | |
| # 1 enables them ONLY if the application bits for these protections are set to “enable” | |
| # 2 enables them by default, except if the application bits are set to “disable” | |
| # 3 enables them always, whatever the application bits |
(from http://www.metabrew.com/article/a-million-user-comet-application-with-mochiweb-part-1)
Save yourself some time and tune the kernel tcp settings before testing with lots of connections, or your test will fail and you’ll see lots of Out of socket memory messages (and if you are masquerading, nf_conntrack: table full, dropping packet.)
Here are the sysctl settings I ended up with - YMMV, but these will probably do:
$ cat /etc/sysctl.conf
# General gigabit tuning:
net.core.rmem_max = 16777216
| Put these in /etc/sysctl.conf then run sysctl -p to apply them. | |
| # General gigabit tuning: | |
| net.core.rmem_max = 16777216 | |
| net.core.wmem_max = 16777216 | |
| net.ipv4.tcp_rmem = 4096 87380 16777216 | |
| net.ipv4.tcp_wmem = 4096 65536 16777216 | |
| net.ipv4.tcp_syncookies = 1 | |
| # this gives the kernel more memory for tcp |
| #!/bin/bash | |
| echo "*****************************************" | |
| echo " Based on information from Google" | |
| echo " http://dev.chromium.org/spdy/spdy-best-practices" | |
| echo "*****************************************" | |
| sudo su | |
| yum –y update | |
| echo "*****************************************" | |
| echo " Changing initcwnd and initrwnd" | |
| echo " Step 1: check route settings." |
| // sending to sender-client only | |
| socket.emit('message', "this is a test"); | |
| // sending to all clients, include sender | |
| io.emit('message', "this is a test"); | |
| // sending to all clients except sender | |
| socket.broadcast.emit('message', "this is a test"); | |
| // sending to all clients in 'game' room(channel) except sender |
| var mongoose = require('mongoose'); | |
| var Schema = mongoose.Schema; | |
| var assert = require('assert') | |
| console.log('\n==========='); | |
| console.log(' mongoose version: %s', mongoose.version); | |
| console.log('========\n\n'); | |
| var dbname = 'testing_geojsonPoint'; |