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node and Error: EMFILE, too many open files
...ID USER FD TYPE DEVICE SIZE/OFF NODE NAME
...
nodejs 12211 root 1012u IPv4 151317015 0t0 TCP 10.101.42.209:40371->54.236.3.170:80 (ESTABLISHED)
nodejs 12211 root 1013u IPv4 151279902 0t0 TCP 10.101.42.209:43656->54.236.3.172:80 (ESTABLISHED)
nodejs 12211 ...
Can someone explain the right way to use SBT?
...use sbt is:
Use sbt-extras - just get the shell script and add it to the root of you project
Create a project folder with a MyProject.scala file for setting up sbt. I much prefer this over the build.sbt approach - it's scala and is more flexible
Create a project/plugins.sbt file and add the approp...
How can I get the MAC and the IP address of a connected client in PHP?
...you need to do is to put arp into diferrent group.
Default:
-rwxr-xr-x 1 root root 48K 2008-11-11 18:11 /usr/sbin/arp*
With command:
sudo chown root:www-data /usr/sbin/arp
you will get:
-rwxr-xr-x 1 root www-data 48K 2008-11-11 18:11 /usr/sbin/arp*
And because apache is a daemon running un...
MQTT与TCP的区别 - 创客硬件开发 - 清泛IT社区，为创新赋能！
... Maori dictionary)。10. mqtt客户端connect时，可以带有用户名和密码，用于验证客户端。服务端可以根据clientid、IP地址、用户名等进行ACL访问控制。可以通过自定义应用消息实现客户端对服务端的身份验证。11. 有商业和开源的mqtt broke...
浅谈TCP优化 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...里就不一一说明了，有兴趣的读者可以自行查阅。
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如何调整「rwnd」到一个合理值
有很多人都遇到过网络传输速度过慢的问题，比如说明明是百兆网络，其最大传输数据的理论值怎么着也得有个十兆，但是实际情况却相距...
MySQL ON DUPLICATE KEY UPDATE for multiple rows insert in single query
...
INSERT INTO ... ON DUPLICATE KEY UPDATE will only work for MYSQL, not for SQL Server.
for SQL server, the way to work around this is to first declare a temp table, insert value to that temp table, and then use MERGE
Like this:
declare @Source table
(
name varchar(30),
age decimal(...
How to import classes defined in __init__.py
...atch, os
from lib.settings import Values
from lib import Helper
print
for root, dirs, files in os.walk('.'):
for f in fnmatch.filter(files, '*.py'):
print "# %s/%s" % (os.path.basename(root), f)
print open(os.path.join(root, f)).read()
print
# lib/helper.py
print 'help...
Prevent direct access to a php include file
...direct access to files is to place them outside of the web-server document root (usually, one level above). You can still include them, but there is no possibility of someone accessing them through an http request.
I usually go all the way, and place all of my PHP files outside of the document root...
MySQL - How to select data by string length
Is there a MySQL function to do this (of course instead of string_length )?
6 Answers
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MySQL Select all columns from one table and some from another table
...mns from one table and just some columns from another table using JOIN? In MySQL.
4 Answers
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