So, how does this works on Linux?

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For the past few days I have been talking about our findings with regards to creating ACID storage solution. And mostly I’ve been focusing on how it works with Windows, using Windows specific terms and APIs.

The problem is that I am not sure if those are still relevant if we talk about Linux. I know that fsync perf is still an issue (if only because both Win & Lin are running on the same hardware). But would the same solutions apply?

For example, the nearest that I can find to FILE_FLAG_NO_BUFFERING is O_DIRECT and FILE_FLAG_WRITE_THROUGH appears to be similar to  O_SYNC. But I am not sure if they are actually behaving in the same fashion.

Any ideas? Anyone has something like Process Monitor for Linux and can look at the actual behavior of industry grade databases commit behavior?

From my exploring, it appears that PostgreSQL is using fdatasync() as the default approach, but it can use O_DIRECT and O_DSYNC as well, so that is promising. But I would like to have someone who actually know Linux intimately tell me if I am even in the right direction.