每次我完成一项任务时，我都会做出承诺。这通常需要30分钟到1小时。

我觉得你不用太担心多久来一次。重要的是什么，什么时候，为什么。说你必须每3小时或每24小时完成一次任务是毫无意义的。有事情要承诺时就承诺，没有事情就不要承诺。

以下是我推荐的版本控制最佳实践的摘录:

[...] If you are doing many changes to a project at the same time, split them up into logical parts and commit them in multiple sessions. This makes it much easier to track the history of individual changes, which will save you a lot of time when trying to find and fix bugs later on. For example, if you are implementing feature A, B and C and fixing bug 1, 2 and 3, that should result in a total of at least six commits, one for each feature and one for each bug. If you are working on a big feature or doing extensive refactoring, consider splitting your work up into even smaller parts, and make a commit after each part is completed. Also, when implementing independent changes to multiple logical modules, commit changes to each module separately, even if they are part of a bigger change. Ideally, you should never leave your office with uncommitted changes on your hard drive. If you are working on projects where changes will affect other people, consider using a branch to implement your changes and merge them back into the trunk when you are done. When committing changes to libraries or projects that other projects—and thus, other people—depend on, make sure you don’t break their builds by committing code that won’t compile. However, having code that doesn’t compile is not an excuse to avoid committing. Use branches instead. [...]

我使用的经验法则是签入，当签入的文件组可以被单个签入注释覆盖时。

这通常是为了确保签入是原子的，并且注释可以很容易地被其他开发人员消化。

当您的更改影响到具有应用程序范围的配置文件(例如spring上下文文件或struts配置文件)时，情况尤其如此。如果您在签入之前做了几个“组”的更改，它们的影响在配置文件中会重叠，导致两个组彼此合并。

如果您正在进行重大更改，并且担心会影响其他使用代码的人，那么您可以创建一个新的分支，然后在更改完成后合并回主干。

你现在的模式说得通。请记住如何使用这个源代码控制:如果您必须回滚，或者如果您想做一个不同的?在这些情况下，你所描述的块看起来就像是正确的差异:差异将准确地显示在实现bug #(在签入日志中指定)时发生了什么变化，或者确切地显示用于实现特性的新代码是什么。类似地，回滚一次只会触及一个东西。

我喜欢每30-60分钟提交一次更改，只要它编译干净，并且在单元测试中没有回归。