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Earlier quoted context omitted.
Why do applications think they can manage my memory better than my kernel?
Actually, MongoDB does leave memory management to the kernel by using MMAP to access data files. Most kernels will allocate a lot of memory to the disk cache, which can make it look like mongo is eating all of your ram.
If your really serious about developing stuff what will end up running on a Linux server, I think you should really be using Linux on the development machine. I know that is not always practical, but more people should do it. No one would dream of writing a Mac app on Windows, and I don't see why Linux should be any different.
How do you handle version control in this environment? Locally on the mac or in the virtual server?
It makes for very convenient testing and it has helped me catch issues others didn't see on their distros, mostly because CentOS has ancient versions of everything and sometimes people don't realize they are relying on a feature that was introduced later.