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tcp加速技术解决方案 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...弊端
慢启动，指数增加（有可能被推迟确认），http/2.0通过减少连接数来避免慢启动，上图经过4个RTT时间cwnd从1个MSS增加到慢启动阈值16
增加到慢启动阈值后，线性增加慢。 在一个RTT时间内收到所有确认只能增加1个MSS
丢...
CSS hack大全 - 创意 - 清泛网 - 专注C/C++及内核技术
...巧大全
——作者：吴雷君
兼容范围：
IE:6.0+，FireFox:2.0+，Opera 10.0+，Sarari 3.0+，Chrome
参考资料：
各游览器常用兼容标记一览表:
标记
IE6
IE7
IE8
FF
Opera
Sarari
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Any way to modify Jasmine spies based on arguments?
...on of Jasmine, the syntax is slightly different:
1.3.1: .andCallFake(fn)
2.0: .and.callFake(fn)
Resources:
withArgs docs
callFake docs
andCallFake vs and.callFake
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Why doesn't C have unsigned floats?
...rts of problems if there are no negative values. Consider this:
float a = 2.0f, b = 10.0f, c;
c = a - b;
What value does c have? -8. But what would that mean in a system without negative numbers. FLOAT_MAX - 8 perhaps? Actually, that doesn't work as FLOAT_MAX - 8 is FLOAT_MAX due to precision eff...
@Basic(optional = false) vs @Column(nullable = false) in JPA
...clipseLink Architecture Committee Member, TopLink Core Technical Lead, JPA 2.0 Expert Group Member) wrote a good answer on this topic so instead of paraphrasing him, I'll quote his answer:
The difference between optional and
nullable is the scope at which they
are evaluated. The definition o...
CodeFile vs CodeBehind
...ile: You provide the source file with the solution for deployment. ASP.NET 2.0 runtime compiles the code when needed. The compiled files are at Microsoft.NET[.NET version]\Temporary ASP.NET Files.
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How do I create an Excel (.XLS and .XLSX) file in C# without installing Microsoft Office?
...
And what about using Open XML SDK 2.0 for Microsoft Office?
A few benefits:
Doesn't require Office installed
Made by Microsoft = decent MSDN documentation
Just one .Net dll to use in project
SDK comes with many tools like diff, validator, etc
Links:
Gi...
Sample settings.xml for maven
...ship. The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in...
How to use SCNetworkReachability in Swift
... edit history if somebody needs it.)
This is how you would do it in Swift 2.0 (Xcode 7):
import SystemConfiguration
func connectedToNetwork() -> Bool {
var zeroAddress = sockaddr_in()
zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
zeroAddress.sin_family = sa_family_t(AF_INE...
What's the difference between JPA and Hibernate? [closed]
...uest) which resulted in JPA 1.0 (2006) and eventually JSR 317 which is JPA 2.0 (2009). These are specifications of a generic Java Persistence API. The API is provided in the JDK as a set of interfaces so that your classes can depend on the javax.persistence and not worry about the particular vendor ...