Have had some folks ask about the Carmine appender performance I quoted - 
the 50k/sec figure is conservative if we're talking about server hardware. 
If you're not logging awfully large arguments (large state maps, etc.) - 
you'll basically see standard [unpipelined] Redis write performance for 
your system.

Each log entry consists of a serialization and 2 Redis ops (ZSET, HSET). 
Log entry garbage collection is done infrequently so the amortised cost is 
low.

I see around 250k writes/sec on an Intel Xeon E3-1270 Quadcore Haswell. 
That's an upper-limit for the Redis server, the actual bottleneck will 
likely be the clients making the logging calls.

-- 
*Peter Taoussanis*

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