rick446

If they are always under 16MB, you'll be fine, though if you could stream them out of GridFS using a chunked encoding or something like that, you might save a bit of RAM.

I guess it depends on what % of your writes were simply updating a boolean or integer value. My benchmark shows that simple updates like that don't affect query performance much. Writes that take longer probably have different performance characteristics, YMMV, etc.

Glad to help! 10gen actually has a policy of never sharing benchmarks so that explains why they never said anything.

I guess on an extremely high traffic site running with a relatively small amount of RAM you could cycle through the whole LRU cache in the VM between operations, but I'd expect the probability to be vanishingly small.

Yeah, I guess I should make the point that if you don't put the journal on SSD (and you only need a few gigs of SSD to journal terabytes of spinning disk storage), you will see significant slowdown.