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1 代码优化 1 尽量静态化 如果一个方法能被静态,那就声明它为静态的,速度可提高1/4,甚至我测试的时候,这个提高了近三倍. 当然了,这个测试方法需要在十万级以上次执行,效果才明显. 其实静态方法和非静态方法的效率主要区别在内存:静态方法在程序开始时生成内存,实例方法(非静态方法)在程序运行中生成内存,所以静态方法可以直接调用,实例方法要先成生实例再调用,静态速度很快,但是多了会占内存. 任何语言都是对内存和磁盘的操作,至于是否面向对象,只是软件层的问题,底层都是一样的,只是实现方法不同.静态…

#!/usr/bin/python # 8th November, 2009 # update manager failed, giving me the error: # 'files list file for package 'xxx' is missing final newline' for every package. # some Googling revealed that this problem was due to corrupt files(s) in /var/lib/…

Cause - Failed to access the temporary location. Action - Ensure that the current user has required permissions to access the temporary location. Additional Information:  - Framework setup check failed on all the nodes - Cause: Cause Of Problem Not A…

Travis -  June 13, 2015 - Leave a comment One of the most common things I do on Linux machines is open ports to test software in a development environment.  In the past, that meant trying to remember (and Googling) cryptic iptables commands.  Now, Ce…

This week I setup the Jenkins on my Mac and try to build iOS applications. unfortunately I got the code signing issues, either I use xcode plugin or xcode command line tool. Through a couple days of googling and I could not find any solution that wor…

1.尽量静态化: 如果一个方法能被静态,那就声明它为静态的,速度可提高1/4,甚至我测试的时候,这个提高了近三倍.当然了,这个测试方法需要在十万级以上次执行,效果才明显.其实静态方法和非静态方法的效率主要区别在内存:静态方法在程序开始时生成内存,实例方法在程序运行中生成内存,所以静态方法可以直接调用,实例方法要先成生实例,通过实例调用方法,静态速度很快,但是多了会占内存.任何语言都是对内存和磁盘的操作,至于是否面向对象,只是软件层的问题,底层都是一样的,只是实现方法不同.静态内存是连续的,因为是…

Linux Essentials for Delphi Developers   There is currently no way using Delphi to target Linux. Long ago there was a thing called Kylix that worked on one version of RedHat Linux, barely, back in the 1990s. But in the Community road-map, targeting a…

深入分析PHP优化及注意事项 1.尽量静态化: 如果一个方法能被静态,那就声明它为静态的,速度可提高1/4,甚至我测试的时候,这个提高了近三倍. 当然了,这个测试方法需要在十万级以上次执行,效果才明显. 其实静态方法和非静态方法的效率主要区别在内存:静态方法在程序开始时生成内存,实例方法在程序运行中生成内存,所以静态方法可以直接调用,实例方法要先成生实例,通过实例调用方法,静态速度很快,但是多了会占内存. 任何语言都是对内存和磁盘的操作,至于是否面向对象,只是软件层的问题,底层都是一样的,只是实…

1.尽量静态化: 如果一个方法能被静态,那就声明它为静态的,速度可提高1/4,甚至我测试的时候,这个提高了近三倍.当然了,这个测试方法需要在十万级以上次执行,效果才明显.其实静态方法和非静态方法的效率主要区别在内存:静态方法在程序开始时生成内存,实例方法在程序运行中生成内存,所以静态方法可以直接调用,实例方法要先成生实例,通过实例调用方法,静态速度很快,但是多了会占内存.任何语言都是对内存和磁盘的操作,至于是否面向对象,只是软件层的问题,底层都是一样的,只是实现方法不同.静态内存是连续的,因为是…

1.尽量静态化: 如果一个方法能被静态,那就声明它为静态的,速度可提高1/4,甚至我测试的时候,这个提高了近三倍. 当然了,这个测试方法需要在十万级以上次执行,效果才明显. 其实静态方法和非静态方法的效率主要区别在内存:静态方法在程序开始时生成内存,实例方法在程序运行中生成内存,所以静态方法可以直接调用,实例方法要先成生实例,通过实例调用方法,静态速度很快,但是多了会占内存. 任何语言都是对内存和磁盘的操作,至于是否面向对象,只是软件层的问题,底层都是一样的,只是实现方法不同.静态内存是连续的,…

Q: Is it possible to check which package do I need to install to get certain .sty file from tlmgr rather than googling it or going to CTAN? A: $ tlmgr search --global --file cfr-lm.sty tlmgr: package repository http://mirror.ox.ac.uk/sites/ctan.org/s…

I can assure you: SelectedItems is indeed bindable as a XAML CommandParameter After a lot of digging and googling, I have finally found a simple solution to this common issue. To make it work you must follow ALL the following rules: Following Ed Ball…

VirtualBox error: Kernel driver not installed (rc=1908) Hi all, Let me first say that this is my final resort after googling this issue for the last several hours. None of the solutions that I have found are working for me. My VirtualBox (PUEL, not O…

原文出处:http://www.fpga4fun.com/PCI-Express4.html 感觉没什么好翻译的,都比较简单,主要讲了TLP的帧结构 In the transaction layer, we receive "packets". There is a 32-bits bus and the packets arrive on the bus (packet lengths are always multiples of 32-bits). Maybe one packe…

转自: http://russmatney.com/techsposure/update-protobuf-golang-grpc/ TL;DR: When protobuf updates, all the .protos and deps need to update. This post is a quick-lookup for how to do that so I’m not googling it every time. Go Dependencies Update your re…

自己用树莓派搭建了个小server,用了很长时间了,最近查看log发现有很多SSH登陆失败,瞬间心就碎了,一直没关心小派的安全问题,怪我咯! 马上行动,首先研究下log:/var/log/auth.log记录了SSH登陆等权限安全信息,如何知道自己被攻击了呢? # grep sshd.\*Failed /var/log/auth.log | less Nov 16 11:26:44 raspberrypi2 sshd[4876]: Failed password for root from 61…

源文地址 (September 2008) For the last couple of years, I've been working on European Space Agency (ESA) projects - writing rather complex code generators. In the ESA project I am currently working on, I am also the technical lead; and I recently faced t…

原文地址:Integrating JAD decompiler into JDeveloper In JDeveloper, when debugging or otherwise navigating to classes that JDeveloper does not have the source code for, JDeveloper generates a "stub source", showing you only the fields and methods but…

1.尽量静态化: 如果一个方法能被静态,那就声明它为静态的,速度可提高1/4,甚至我测试的时候,这个提高了近三倍.当然了,这个测试方法需要在十万级以上次执行,效果才明显.其实静态方法和非静态方法的效率主要区别在内存:静态方法在程序开始时生成内存,实例方法在程序运行中生成内存,所以静态方法可以直接调用,实例方法要先成生实例,通过实例调用方法,静态速度很快,但是多了会占内存.任何语言都是对内存和磁盘的操作,至于是否面向对象,只是软件层的问题,底层都是一样的,只是实现方法不同.静态内存是连续的,因为是…

一. 先上干货 解决问题 1.1 安装工具alsa-tools-gui sudo apt-get install alsa-tools-gui 1.2 通过hdajackretask设置 直接执行命令,然后在图形界面中操作, 将“Green headphone, Front side” 选中Override, 并设置为“Not connected”, 然后选择 “Apply Now”, 之后就没有这个烦恼的问题了. hdajackretask 如下图: 二.问题描述 2.1 问题版本Ubuntu…

http://www.zvolkov.com/clog/2009/07/09/why-nhibernate-updates-db-on-commit-of-read-only-transaction/ Always be careful with NULLable fields whenever you deal with NHibernate. If your field is NULLable in DB, make sure corresponding .NET class uses Nu…

How To Ask Questions The Smart Way Eric Steven Raymond Thyrsus Enterprises <esr@thyrsus.com> Rick Moen <respond-auto@linuxmafia.com> Copyright © 2001,2006 Eric S. Raymond, Rick Moen Revision History Revision 3.9 23 Apr 2013 esr URL fixes. Revi…

1.尽量静态化: 如果一个方法能被静态,那就声明它为静态的,速度可提高1/4,甚至我测试的时候,这个提高了近三倍.   当然了,这个测试方法需要在十万级以上次执行,效果才明显.   其实静态方法和非静态方法的效率主要区别在内存:静态方法在程序开始时生成内存,实例方法在程序运行中生成内存,所以静态方法可以直接调用,实例方法要先成生实例,通过实例调用方法,静态速度很快,但是多了会占内存.  任何语言都是对内存和磁盘的操作,至于是否面向对象,只是软件层的问题,底层都是一样的,只是实现方法不同.静态内存…

su : must be run from a terminal After some googling, I found the solution from Tero's glob. If you have python installed, just run the following from your shell: echo "import pty; pty.spawn('/bin/bash')" > /tmp/asdf.py python /tmp/asdf.py 30…

一.说明 IG是information gain 的缩写,中文名称是信息增益,是选择特征的一个很有效的方法(特别是在使用svm分类时).这里不做详细介绍,有兴趣的可以googling一下. chi-square 是一个常用特征筛选方法,在种子词扩展那篇文章中,有详细说明,这里不再赘述. 二.weka中的使用方法 1.特征筛选代码 package com.lvxinjian.alg.models.feature; import java.nio.charset.Charset; import ja…

A. Eevee time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You are solving the crossword problem K from IPSC 2014. You solved all the clues except for one: who does Eevee evolve into? You are…

Stephen Smith's Blog All things Sage 300… The Road to TensorFlow – Part 7: Finally Some Code leave a comment » Introduction Well after a long journey through Linux, Python, Python Libraries, the Stock Market, an Introduction to Neural Networks and tr…

http://queue.acm.org/detail.cfm?id=1854041 The July/August issue of acmqueue is out now acmqueue is free for ACM professional members. Non-members can purchase an annual subscription for $19.99 or a single issue for $6.99. Download the app from iTune…

Most of the database intensive applications are worring about the default values of these variables obviously. Developers used to inform me that they need to extend the wait_timeout value in order to complete the query execution. After some googling,…