据说每个安装完NS的人都可以写一篇博客,这个过程确实很折腾,可能会遇到各种编译错误,还会缺少各种软件包。 我是vmware下CentOS 6.2安装的ns-allinone-2.34,ns-allinone包含了所有组件,相对来说是懒人式安装,以下是我安装中遇到的问题及解决方法: (1
据说每个安装完NS的人都可以写一篇博客,这个过程确实很折腾,可能会遇到各种编译错误,还会缺少各种软件包。
我是vmware下CentOS 6.2安装的ns-allinone-2.34,ns-allinone包含了所有组件,相对来说是懒人式安装,以下是我安装中遇到的问题及解决方法:
(1)
问题:
tk8.4.18 make failed! Exiting …
解决:
安装libx11-devel和libxmu-devel
注意安装软件包的时候最好尽量在线安装,否则手动安装还要解决各种依赖关系会让你吐血身亡!所以还是尽量使用yum install libX11-devel ,yum install libXmu-devel,让系统自动给你解决依赖关系并找到合适的版本。如果是虚拟机上不了网或者源设置的不好,一定要解决联网问题和源的设置问题,这样就会有一劳永逸的效果,以后再安装软件直接yum install就好了。
(2)
问题:
otcl-1.13 make failed! Exiting …
原因:
gcc4.0之前的版本是使用“ld-share”来生成共享库的,而gcc4.0之后的版本使用“gcc-share”命令生成共享库。
解决:
进入otcl-1.13目录,
Vimconfigure.in
把77行处的
SHLIB_LD=”ld-shared”
改为
SHLIB_LD=”gcc-shared”
然后vimconfigure
把6304行的
SHLIB_LD=”ld-shared”
改为
SHLIB_LD=”gcc-shared”
(3)
问题:
tclcl-1.19make failed! Exiting ...
make: g++:命令未找到
make: ***[tcl2c++]错误
tclcl-1.19 make failed! Exiting …
原因:
g++没有安装
解决:
yum install gcc-c++,注意,这个软件包叫gcc-c++,不是g++
解决以上问题后,在ns-allinone-2.34目录下执行./install,过一段时间编译安装成功后,会有如下的提示:
- IMPORTANT NOTICES:
- (1) You MUST put /home /pengyicun/桌面/ns-allinone-2.34/otcl-1.13, /home/pengyicun/桌面/ns- allinone-2.34/lib,
- into your LD_LIBRARY_PATH environment variable.
- If it complains about X libraries, add path to your X libraries
- into LD_LIBRARY_PATH.
- If you are using csh, you can set it like:
- setenv LD_LIBRARY_PATH
- If you are using sh, you can set it like:
- export LD_LIBRARY_PATH=
- (2) You MUST put /home /pengyicun/桌面/ns-allinone-2.34/tcl8.4.18 /library into your TCL_LIBRARY environmental
- variable. Otherwise ns/nam will complain during startup.
- After these steps, you can now run the ns validation suite with
- cd ns-2.34; ./validate
- For trouble shooting, please first read ns problems page
- http://www.isi.edu/nsnam/ns/ns-problems.html. Also search the ns mailing list archive
- for related posts.
最后按照提示配置好3个环境变量就好了,配置方法:
vim ~/.bashrc,然后添加三行:
export PATH=$PATH:你的路径
export LD_LIBRARY_PATH=你的路径
export TCL_LIBRARY=你的路径
然后关闭shell窗口并重新打开,执行ns命令出现%符号,说明环境变量也配置好了。
cd ns-2.34,并执行./validate,测试NS安装是否有效,这个命令会测试很多例子,有些例子可能会fail,忽略不管。
进入ns-2.34/tcl/ex目录,会有很多.tcl的例子,可以尝试一下ns simple.tcl,这时会出现两个图形控制窗口。

MySQL processes data replication through three modes: asynchronous, semi-synchronous and group replication. 1) Asynchronous replication performance is high but data may be lost. 2) Semi-synchronous replication improves data security but increases latency. 3) Group replication supports multi-master replication and failover, suitable for high availability requirements.

The EXPLAIN statement can be used to analyze and improve SQL query performance. 1. Execute the EXPLAIN statement to view the query plan. 2. Analyze the output results, pay attention to access type, index usage and JOIN order. 3. Create or adjust indexes based on the analysis results, optimize JOIN operations, and avoid full table scanning to improve query efficiency.

Using mysqldump for logical backup and MySQLEnterpriseBackup for hot backup are effective ways to back up MySQL databases. 1. Use mysqldump to back up the database: mysqldump-uroot-pmydatabase>mydatabase_backup.sql. 2. Use MySQLEnterpriseBackup for hot backup: mysqlbackup--user=root-password=password--backup-dir=/path/to/backupbackup. When recovering, use the corresponding life

The main reasons for slow MySQL query include missing or improper use of indexes, query complexity, excessive data volume and insufficient hardware resources. Optimization suggestions include: 1. Create appropriate indexes; 2. Optimize query statements; 3. Use table partitioning technology; 4. Appropriately upgrade hardware.

MySQL view is a virtual table based on SQL query results and does not store data. 1) Views simplify complex queries, 2) Enhance data security, and 3) Maintain data consistency. Views are stored queries in databases that can be used like tables, but data is generated dynamically.

MySQLdiffersfromotherSQLdialectsinsyntaxforLIMIT,auto-increment,stringcomparison,subqueries,andperformanceanalysis.1)MySQLusesLIMIT,whileSQLServerusesTOPandOracleusesROWNUM.2)MySQL'sAUTO_INCREMENTcontrastswithPostgreSQL'sSERIALandOracle'ssequenceandt

MySQL partitioning improves performance and simplifies maintenance. 1) Divide large tables into small pieces by specific criteria (such as date ranges), 2) physically divide data into independent files, 3) MySQL can focus on related partitions when querying, 4) Query optimizer can skip unrelated partitions, 5) Choosing the right partition strategy and maintaining it regularly is key.

How to grant and revoke permissions in MySQL? 1. Use the GRANT statement to grant permissions, such as GRANTALLPRIVILEGESONdatabase_name.TO'username'@'host'; 2. Use the REVOKE statement to revoke permissions, such as REVOKEALLPRIVILEGESONdatabase_name.FROM'username'@'host' to ensure timely communication of permission changes.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

Zend Studio 13.0.1
Powerful PHP integrated development environment

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

SublimeText3 Chinese version
Chinese version, very easy to use

Atom editor mac version download
The most popular open source editor
