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Pin an Executor's State to minimize atomic operations. #146

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Use Pin<&'a State> to point to the state instead of cloning Arcs, this should reduce the amount of atomic operations required.

This should be sound given that the state are never moved until the Executor is dropped. This still uses Arc instead of Box as miri will treat a former Box as a uniquely owned pointer and cannot be shared (backed by Unique vs Shared).

Benchmark results:

group                                               master                                 pinned-state
-----                                               ------                                 ------------
executor::create                                    1.06  944.7±129.72ns        ? ?/sec    1.00   889.7±17.24ns        ? ?/sec
multi_thread/executor::channels                     1.00     35.5±0.76ms        ? ?/sec    1.00     35.7±0.75ms        ? ?/sec
multi_thread/executor::spawn_batch                  1.23     27.8±5.06µs        ? ?/sec    1.00     22.6±9.96µs        ? ?/sec
multi_thread/executor::spawn_many_local             1.08     23.2±0.57ms        ? ?/sec    1.00     21.5±0.79ms        ? ?/sec
multi_thread/executor::spawn_one                    1.07   995.0±35.82ns        ? ?/sec    1.00   929.5±26.16ns        ? ?/sec
multi_thread/executor::spawn_recursively            1.06    144.8±1.28ms        ? ?/sec    1.00    136.8±1.56ms        ? ?/sec
multi_thread/executor::web_server                   1.00     50.9±1.03ms        ? ?/sec    1.00     51.1±1.80ms        ? ?/sec
multi_thread/executor::yield_now                    1.00     20.2±0.61ms        ? ?/sec    1.01     20.4±0.28ms        ? ?/sec
single_thread/executor::channels                    1.00     14.4±0.41ms        ? ?/sec    1.07     15.4±0.66ms        ? ?/sec
single_thread/executor::spawn_batch                 1.08    20.2±11.74µs        ? ?/sec    1.00     18.7±8.31µs        ? ?/sec
single_thread/executor::spawn_many_local            1.11      5.4±0.72ms        ? ?/sec    1.00      4.9±0.24ms        ? ?/sec
single_thread/executor::spawn_one                   1.02  1422.7±75.41ns        ? ?/sec    1.00  1388.6±42.78ns        ? ?/sec
single_thread/executor::spawn_recursively           1.03     22.6±1.05ms        ? ?/sec    1.00     21.9±1.11ms        ? ?/sec
single_thread/executor::web_server                  1.03     23.0±0.22ms        ? ?/sec    1.00     22.3±0.31ms        ? ?/sec
single_thread/executor::yield_now                   1.02      4.1±0.06ms        ? ?/sec    1.00      4.0±0.03ms        ? ?/sec

@james7132 james7132 requested a review from notgull August 14, 2025 01:42
@james7132 james7132 mentioned this pull request Aug 14, 2025
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