Greg Stark wrote:

That said, I'm curious why the emulated servers performed better than the
Native Windows port. My first thought is that they probably aren't syncing
every write to disk so effectively they're defeating the fsyncs, allowing the
host OS to buffer disk writes.

I havn't tested it, and it's certanly possible. However, please bear in mind that it is also possible that it just gives better performance.

The reason this may be possible is that the emulation layer gets the CPU (and other resources) from the OS in bulk, and decides on it's own how to allocate it to the various processes running within the emulation. Inparticular, this "on it's own" is done using the stock Linux kernel. As Postgresql works sufficiently better on Linux than on Windows, this yields better performance.

Again - speculation only. Someone should defenitely make sure that no caching takes place where it shouldn't.

As a side note, I have had a chance to talk to Dan Aloni (coLinux maintainer) about running PostgreSQL on coLinux. He said that he knows that this particular use is high on people's priority list, but he feels it is totally unsafe to run a production database on alpha grade software. Then again, free software projects being what they are, this is usually what a maintainer would say.


Shachar Shemesh
Lingnu Open Source Consulting

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