In particular for Aeron LogBuffer false sharing on length writes can only happen (on systems with cache line length 64b) for 0 length messages as the data header size is 32b:https://github.com/real-logic/Aeron/blob/e0bb87c4538125c577a653f20f5865a6d6d8dc95/aeron-client/src/main/java/io/aeron/protocol/DataHeaderFlyweight.java#L34-L34
and messages are aligned to 32b:https://github.com/real-logic/Aeron/blob/ae85cb4d00e5f8c7eed3dd18d9ba737a4885393a/aeron-client/src/main/java/io/aeron/logbuffer/FrameDescriptor.java#L58-L58 This is ignoring prefetch induced false sharing which increases the boundaries of this issue to 128b, but which is also less severe. -- You received this message because you are subscribed to the Google Groups "mechanical-sympathy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
