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> In MongoDB version 2.0 and higher, this is addressed by detecting the likelihood of a page fault and releasing the lock before faulting.

I'm assuming MongoDB tries to detect this with OS-specific syscalls. Has there been any attempt to determine whether it would be even faster and/or more portable to just unconditionally "read" the pages before acquiring the lock?

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I forget who, but a fairly popular implementation of MongoDB once posted about their experience, and they mentioned that they always did a find before doing an update.

Every now and again you'll see this approach get suggested in the groups.

Sounds like a great extension of the benchmarks provided in the article.

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