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benches: baseline results

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Two compile fixes:
- tokio_favored.rs bench_mpsc_smarm: consumer spawn closure returned u64 via
  bare 'count' tail expression; smarm::Runtime::run() requires FnOnce()->().
  Fixed to 'let _ = count;'. Same fix on the consumer.join() call site.
- smarm_favored.rs bench_unc_smarm: same pattern, same fix.

Baseline run: Intel Xeon @ 2.80GHz, 1 core, kernel 6.18.5, rustc 1.95.0,
smarm 0.3.0, no RUSTFLAGS. Single-CPU sandbox — N-thread rows identical to
1-thread; scaling sweep limited to 1 thread.

Notable findings:
- deep_recursion: tokio wins (22 vs 62 us); mmap stack alloc cost dominates
  for single-use actors at depth 500.
- yield_in_hot_loop: tokio wins (138 vs 182 ms); smarm mutex overhead on
  yield_now exceeds expected naked-switch advantage on 1 CPU.
- mpsc_contention/uncontended_channel/catch_unwind_panics: smarm wins as
  predicted.
- spawn_storm_busy: smarm 47x slower; global mutex saturated by bg yielders.
This commit is contained in:
Bench
2026-05-24 10:49:23 +00:00
committed by smarm
parent 4b348d12be
commit 6d1c59fb99
8 changed files with 1205 additions and 0 deletions
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42
benches/baseline-output/tokio_favored.txt Normal file
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smarm tokio-favored benchmarks
available parallelism: 1 threads
ITERS=15 (+1 warmup, discarded)
STORM_BACKGROUND=8, STORM_SPAWN=10000, MPSC=32×10000, TIMER_ACTORS=10000 (1–10 ms), SCALING_N=400000/64
================================================================================
spawn_storm_busy: 8 bg yielders + 10000 zero-work spawns
================================================================================
runtime | result | median µs | min µs | max µs
--------------------------------------------------------------------------------
smarm 1-thread | 10000 | 105512 | 102322 | 120552
smarm 1-thread | 10000 | 107113 | 104048 | 112377
tokio current_thread | 10000 | 2222 | 2124 | 2506
tokio multi-thread | 10000 | 4546 | 3833 | 7305
================================================================================
mpsc_contention: 32 producers × 10000 msgs → 1 consumer
================================================================================
runtime | result | median µs | min µs | max µs
--------------------------------------------------------------------------------
smarm 1-thread | 320000 | 10456 | 10331 | 10639
smarm 1-thread | 320000 | 10395 | 9201 | 10549
tokio current_thread | 320000 | 17348 | 16639 | 19061
tokio multi-thread | 320000 | 18628 | 17499 | 19298
================================================================================
many_timers: 10000 actors sleeping 1–10 ms
================================================================================
runtime | result | median µs | min µs | max µs
--------------------------------------------------------------------------------
smarm 1-thread | 10000 | 120242 | 116239 | 127200
smarm 1-thread | 10000 | 121023 | 113997 | 127826
tokio current_thread | 10000 | 13581 | 13182 | 14415
tokio multi-thread | 10000 | 14266 | 14084 | 14843
================================================================================
multi_thread_scaling: primes in [2, 400000) across 64 workers
================================================================================
runtime | result | median µs | min µs | max µs
--------------------------------------------------------------------------------
smarm 1-thread | 33860 | 19852 | 19601 | 22679
tokio multi 1-thread | 33860 | 19638 | 18994 | 20102