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Is Java really slow?

...y optimized code written in a ahead-of-time compiled language (C, Fortran, etc.) can beat it; however, Java can be more than 10x as fast as PHP, Ruby, Python, etc. There are specific areas where it can beat common compiled languages (if they use standard libraries). There is no excuse for "slow" Ja...
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Why would introducing useless MOV instructions speed up a tight loop in x86_64 assembly?

...ome work in that area. But we're talking a minimum of 5-10 minutes of 100% CPU to compile, and the resulting optimizations would probably be CPU core model and even core or microcode revision specific. – AdamIerymenko Jul 27 '13 at 19:16 ...
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What is “(program)” in Chrome debugger’s profiler?

...s there because the jump from native code to JavaScript, resource loading, etc. has to start somewhere :) You can see examples of the treeview in the Chrome developer tool docs. share | improve thi...
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App Inventor 2 BLE扩展源码分析 - WriteBytes vs WriteStrings 23字节硬编...

一、问题背景 用户反馈:WriteBytes 发送字符串硬件能收到,WriteStrings 发送却收不到。 同样的字符串数据,通过 WriteBytes 方法发送时硬件正常接收,但通过 WriteStrings 方法发送时硬件收不到或收到截断数据。 源码仓库: mit-c...
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普通码农和CTO之间的差距,就是这7点了 - 杂谈 - 清泛网 - 专注C/C++及内核技术

...让大家多思考(希望我达到这个目的了)。 解决完一个问题后我们要经常“回头看看”,我们要学习的不是“解决具体问题的办法”而不是“解决问题的方法”。很多朋友通过网络或者同事帮助解决完一个问题之后就没有然后...
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Android: AsyncTask vs Service

...-consuming tasks that cannot be run of the UI thread. A common example is fetching/processing data when a button is pressed. Services are designed to be continually running in the background. In the example above of fetching data when a button is pressed, you could start a service, let it fetch the...
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CFormView 不显示、空白显示的问题 - C/C++ - 清泛网 - 专注C/C++及内核技术

CFormView 不显示、空白显示的问题有时,CFormView会出现不显示、空白显示的问题,尤其是在View中没有可显示的控件的时候(自绘控件除外)。这时在rc对话框资源中添加一个But...有时,CFormView会出现不显示、空白显示的问题,尤...
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尝试加载 Oracle 客户端库时引发 BadImageFormatException。如果在安装 32 ...

...位 Oracle 客户端组件的情况下以 64 位模式运行,将出现此问题。尝试加载 Oracle 客户端库时引发 BadImageFormatException。如果在安装 32 位 Oracle 客户端组件的情况下以 64 位模式运行,将出...“尝试加载 Oracle 客户端库时引发 BadImageForm...
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IE无法设置短域名下Cookie - 更多技术 - 清泛网 - 专注C/C++及内核技术

...e最近客户在使用我们的流量监测系统以及GA时发现了一个问题,我们统计到的数据比GA的要多很多倍,而且我们统计到的数据中,跳出率非常高,高...最近客户在使用我们的流量监测系统以及GA时发现了一个问题,我们统计到的...
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移动端弱网络测试问题总结 - 更多技术 - 清泛网 - 专注C/C++及内核技术

移动端弱网络测试问题总结 因项目需要,在这两个版本开始引入弱网络测试。本文对测试过程中真实遇到的一些有代表性的问题做一下记录和总结。 先介绍一下使用的弱...因项目需要,在这两个版本开始引入弱网络测试。本...