Re:How Discord stores trillions of messages
by menaerus on Sunday September 29, 2024 @10:06AM
(#41687514)
How about per-node memory pressure, did it change in favor of Scylla? I ask because I would legitimately expect that GC-based system would have a larger pressure on the memory subsystem.
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Re:How Discord stores trillions of messages
by jhgg on Sunday September 29, 2024 @12:38PM
(#41688519)
Scylla just eats all the ram it can with cache. So it's hard to say really. On Cassandra we allocated half the ram to the JVM which it gladly used up and left the other half to the OS for disk cache. On Scylla, since it uses direct io, there is no need for OS disk cache.