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Redis 的性能幻想与残酷现实 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...超过一个 MTU （以太网下大约 1500 bytes），那么对于 10、100、1000 bytes 不同包大小的处理吞吐能力实际结果差不多。关于吞吐量与数据大小的关系可见下面官方网站提供的示意图。
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基于我们真实的使用场景，我们搭建了性...
How to scroll the window using JQuery $.scrollTo() function
I'm trying to scroll down 100px every time the user gets near the top of the document.
6 Answers
...
How to connect to my http://localhost web server from Android Emulator
...or the emulator "Nox App Player". Here is how I figured out it was 172.17.100.2.
Installed Android Terminal Emulator from the app store
Issue ip link show command to show all network interfaces. Of particular interest was the eth1 interface
Issue ifconfig eth1 command, shows net as 172.17.100.15...
How to use timeit module
... random
random.seed('slartibartfast')
s = [random.random() for i in range(1000)]
timsort = list.sort
'''
>>> print min(timeit.Timer('a=s[:]; timsort(a)', setup=setup).repeat(7, 1000))
0.334147930145
Note that the series of statements makes a fresh copy of the unsorted data on every pass...
Print an integer in binary format in Java
...
Assuming you mean "built-in":
int x = 100;
System.out.println(Integer.toBinaryString(x));
See Integer documentation.
(Long has a similar method, BigInteger has an instance method where you can specify the radix.)
...
Image inside div has extra space below the image
...;
}
#block img{
display:block;
}
div {border: 1px solid red;width:100px;}
img {width:100px;}
<p>No fix:</p>
<div><img src="http://i.imgur.com/RECDV24.jpg" /></div>
<p>With vertical-align:bottom; on image:</p>
<div id="vAlign"><img sr...
How to vertically center a container in Bootstrap?
...gt;
...
</div>
</div>
.vertical-center {
min-height: 100%; /* Fallback for browsers do NOT support vh unit */
min-height: 100vh; /* These two lines are counted as one :-) */
display: flex;
align-items: center;
}
Important notes (Considered in the demo):
A perc...
BSS段、数据段、代码段、堆与栈 剖析 - C/C++ - 清泛网 - 专注C/C++及内核技术
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编译如下程序（test.cpp）：
#include <stdio.h>
#define LEN 1002000
int inbss[LEN];
float fA;
int indata[LEN]={1,2,3,4,5,6,7,8,9};
double dbB = 100.0;
const int cst = 100;
int main(void)
{
int run[100] = {1,2,3,4,5,6,7,8,9};
for(int i=0; i<LEN; ++i)
printf("%d ", inbss...
Can I use a min-height for table, tr or td?
...
height for td works like min-height:
td {
height: 100px;
}
instead of
td {
min-height: 100px;
}
Table cells will grow when the content does not fit.
https://jsfiddle.net/qz70zps4/
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...
How do you use NSAttributedString?
...ton.showsTouchWhenHighlighted = true;
let myCGSize:CGSize = CGSizeMake(100.0, 50.0)
let myFrame = CGRectMake(myView.frame.midX - myCGSize.height,myView.frame.midY - 2 * myCGSize.height,myCGSize.width,myCGSize.height)
myButton.frame = myFrame
let myTitle = myAttributedText("Button",20...