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How to implement a system with high throughput , low latency
- Do not use locks in the main transaction flow because they cause context switches, and therefore latency and unpredictable jitter.
- Never have more threads that need to run than you have cores available.
- Set affinity of threads to cores, or at least sockets, to avoid cache pollution by avoiding migration. This is particularly important when on a server class machine having multiple sockets because of the NUMA effect.
- Ensure uncontested access to any resource respecting the Single Writer Principle so that the likes of biased locking can be your friend.
- Keep call stacks reasonably small. Still more work to do here. If you are crazy enough to use Spring, then check out your call stacks to see what I mean! The garbage collector has to walk them finding reachable objects.
- Do not use finalizers.
- Keep garbage generation to modest levels. This applies to most JVMs but is likely not an issue for Zing.
- Ensure no disk IO on the main flow.
- Do a proper warm-up before beginning to measure.
- Do all the appropriate OS tunings for low-latency systems that are way beyond this blog. For example turn offC-States power management in the BIOS and watch out for RHEL 6 as it turns it back on without telling you!
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