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libevent对比libev的基准测试 - C/C++ - 清泛网 - 专注C/C++及内核技术
...O 的客户端），底行使用 1000 个。所有图形都有一个对数 fd 轴，以合理地显示 100 到 100000 的大范围文件描述符编号（实际上，它的实际套接字对，因此实际上进程中的文件描述符数量是原来的两倍）。
讨论
与 libev 相比，li...
SPAN vs DIV (inline-block)
...an't put block elements inside inline elements so:
<p>...<div>foo</div>...</p>
is not strictly valid even if you change the <div> to inline or inline-block.
So, if your element is inline or inline-block use a <span>. If it's a block level element, use a <di...
How do I redirect output to a variable in shell? [duplicate]
...
TL;DR
To store "abc" into $foo:
echo "abc" | read foo
But, because pipes create forks, you have to use $foo before the pipe ends, so...
echo "abc" | ( read foo; date +"I received $foo on %D"; )
Sure, all these other answers show ways to not do what ...
private final static attribute vs private final attribute
...use:
private static final int NUMBER = 10;
Why? This reduces the memory footprint per instance. It possibly is also favourable for cache hits. And it just makes sense: static should be used for things that are shared across all instances (a.k.a. objects) of a certain type (a.k.a. class).
...
What is the best way to ensure only one instance of a Bash script is running? [duplicate]
...script boilerplate
### HEADER ###
LOCKFILE="/var/lock/`basename $0`"
LOCKFD=99
# PRIVATE
_lock() { flock -$1 $LOCKFD; }
_no_more_locking() { _lock u; _lock xn && rm -f $LOCKFILE; }
_prepare_locking() { eval "exec $LOCKFD>\"$LOCKFILE\""; trap _no_more_locking EXIT; }
# ON...
How do I prevent 'git diff' from using a pager?
...d to avoid an error, you have to make an alias like this: git config alias.foo '!git --no-pager foo'. Somewhat confusing. Simply aliasing to '--no-pager foo' won't work.
– Jim Stewart
Oct 10 '13 at 20:20
...
Linux command to print directory structure in the form of a tree
...).
~> tree -d /proc/self/
/proc/self/
|-- attr
|-- cwd -> /proc
|-- fd
| `-- 3 -> /proc/15589/fd
|-- fdinfo
|-- net
| |-- dev_snmp6
| |-- netfilter
| |-- rpc
| | |-- auth.rpcsec.context
| | |-- auth.rpcsec.init
| | |-- auth.unix.gid
| | |-- auth.unix.ip
| | |-- ...
How to convert a file into a dictionary?
...trip().partition(" ")
return int(key), value
with open("file.txt") as fd:
d = dict(get_pair(line) for line in fd)
share
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...
Displaying the build date
...ystem" #>
<#@ output extension=".g.cs" #>
using System;
namespace Foo.Bar
{
public static partial class Constants
{
public static DateTime CompilationTimestampUtc { get { return new DateTime(<# Write(DateTime.UtcNow.Ticks.ToString()); #>L, DateTimeKind.Utc); } }
}
...
Using curl POST with variables defined in bash script functions
...out shell quoting rules:
The double quotes in the -H arguments (as in -H "foo bar") tell bash to keep what's inside as a single argument (even if it contains spaces).
The single quotes in the --data argument (as in --data 'foo bar') do the same, except they pass all text verbatim (including double...