Bufferbloat, rotational disk + BBU style. In case you still you magnetic disks to back a database taking writes, it can be worthwhile to disable "intelligent" controllers that do their own caching/readahead:pic.twitter.com/OoNs560vNU
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Note that for other workloads, with fewer random writes (e.g. increasing shared buffers to contain the whole working set, making small sequential writes more important by using logged tables in an OLTP setup) and more synchronous writes that's not true:pic.twitter.com/B8ru6zbsFf
The queuing logic inside the controller still clearly is crappy, but it's outweighed by being able to acknowledge WAL flushes. So, WAL should be on a drive with the BBU's caching enabled, data absolutely not.
what do you use for your benchmarking (loadgen) ans as metric collection? :)
The benchmark here is just postgres' pgbench. The metrics are a combination of self written tools, and wrappers around tools like iostat (parsing it into separate CSV files). Then a scripts which loads them into pandas, and uses matplotlib to generates the graphss.
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