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Author	SHA1	Message	Date
M. J. Fromberger	f7f4067968	pubsub: simplify and improve server concurrency handling (#7070 ) Rework the internal plumbing of the server. This change does not modify the exported interfaces or semantics of the package, and all the existing tests still pass. The main changes here are to: - Simplify the interface for subscription indexing with a typed index rather than a single nested map. - Ensure orderly shutdown of channels, so that there is no longer a dynamic race with concurrent publishers & subscribers at shutdown. - Remove a layer of indirection between publishers and subscribers. This mainly helps legibility. - Remove order dependencies between registration and delivery. - Add documentation comments where they seemed helpful, and clarified the existing comments where it was practical. Although performance was not a primary goal of this change, the simplifications did very slightly reduce memory use and increase throughput on the existing benchmarks, though the delta is not statistically significant. BENCHMARK BEFORE AFTER SPEEDUP (%) B/op (B) B/op (A) Benchmark10Clients-12 5947 5566 6.4 2017 1942 Benchmark100Clients-12 6111 5762 5.7 1992 1910 Benchmark1000Clients-12 6983 6344 9.2 2046 1959	3 years ago

Author

SHA1

Message

Date

M. J. Fromberger

f7f4067968

pubsub: simplify and improve server concurrency handling (#7070 )

Rework the internal plumbing of the server. This change does not modify the
exported interfaces or semantics of the package, and all the existing tests
still pass.

The main changes here are to:

- Simplify the interface for subscription indexing with a typed index rather
  than a single nested map.

- Ensure orderly shutdown of channels, so that there is no longer a dynamic
  race with concurrent publishers & subscribers at shutdown.

- Remove a layer of indirection between publishers and subscribers. This mainly
  helps legibility.

- Remove order dependencies between registration and delivery.

- Add documentation comments where they seemed helpful, and clarified the
  existing comments where it was practical.

Although performance was not a primary goal of this change, the simplifications
did very slightly reduce memory use and increase throughput on the existing
benchmarks, though the delta is not statistically significant.

    BENCHMARK                BEFORE AFTER SPEEDUP (%) B/op (B) B/op (A)
    Benchmark10Clients-12    5947   5566  6.4         2017     1942
    Benchmark100Clients-12   6111   5762  5.7         1992     1910
    Benchmark1000Clients-12  6983   6344  9.2         2046     1959

3 years ago

1 Commits (c9f90953a2e9320bd23edda102e6756cbcc9b460)