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c5ee62a6a4
"This patchset restricts background writers - such as compactions, streaming flushes and memtable flushes to a maximum amount of CPU usage through a seastar::thread_scheduling_group. The said maximum is recommended to be set 50 % - it is default disabled, but can be adjusted through a configuration option until we are able to auto-tune this. The second patch in this series provides a preview on how such auto-tune would look like. By implementing a simple controller we automatically adjust the quota for the memtable writer processes, so that the rate at which bytes come in is equal to the rates at which bytes are flushed. Tail latencies are greatly reduced by this series, and heavy spikes that previously appeared on CPU-bound workloads are no more." * 'memtable-controller-v5' of https://github.com/glommer/scylla: simple controller for memtable/streaming writer shares. restrict background writers to 50 % of CPU.