N 版本编程和恢复块技术之间的区别

软件容错技术使用两种常用技术来实现容错。

1. N版编程：
在 N 版本编程技术中，有 N 个开发者群体或个人不共享编程过程，这些独立的人开发 N 个版本的软件模块。这种技术背后的想法是，不同的人会犯不同的错误，并会涵盖所有可能的错误。

2. 恢复块：
在恢复块技术中，不同的算法用于不同的尝试块。 Try 块基本上是冗余组件。此处冗余副本不会同时运行。每个 try is 块中的结果通过验收测试进行测试。

N 版本编程和恢复块技术之间的区别：

N-VERSION PROGRAMMING	RECOVERY BLOCKS
N-versions of software are developed by n independent team.	Redundant copies are developed using different algorithms.
Redundant copies are run concurrently.	Redundant copies are run one by one.
Acceptance test is not performed.	Acceptance test is performed.
It can be applied top critical systems.	It can’t be applied to critical systems.
It is possible to achieve same fault for different version.	Same fault can’t be achieved by redundant copies.
It has statistical correlation of failure.	It is used only if task deadline is more than task computation time.
It can be used with task having more or less laxity.	It is used with tasks having more laxity.