smarm-agent
48d47c45c9
Accumulate on-CPU cycles per actor as ActorInfo.budget_cycles, behind the off-by-default budget-accounting feature (D6) — a reductions-style work metric for relative comparison across runs. - Approximate by design (per Mark): charge now - slice-start once at the yield point, reusing the timestamp reset_timeslice already sets, so one RDTSC per resume not two. Wake-slot resumes inherit the slice and so slightly over-attribute the chain's time to the woken actor — noise that averages out; we trade exactness for half the hot-path cost. - Field/ActorInfo member are unconditional (keeps the snapshot shape stable across the feature flag, D1); only the accumulation is gated, so default builds are byte-identical and pay nothing. Reads return 0 when off. Single-writer Relaxed like the other counters; reset in reset_counters (D7). Matrix: default + feature-on + rq-mpmc + rq-striped + release + trace all green; loom unaffected (feature off under --cfg loom).
73 lines
1.3 KiB
TOML
73 lines
1.3 KiB
TOML
[package]
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name = "smarm"
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version = "0.4.0"
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edition = "2021"
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rust-version = "1.95"
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[lints.rust]
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unexpected_cfgs = { level = "warn", check-cfg = ["cfg(loom)"] }
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[features]
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default = ["rq-mutex"]
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smarm-trace = []
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# RFC 016 Chunk 2: cycle-accurate per-actor time-budget accounting. Off by
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# default — it costs two extra RDTSC reads per actor resume on the hot path
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# (D6). The `ActorInfo.budget_cycles` field exists regardless; it just stays 0
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# unless this is enabled.
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budget-accounting = []
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# Run-queue selection: exactly one, compile-time (see src/run_queue.rs).
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# Non-default variants need --no-default-features (features are additive).
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rq-mutex = []
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rq-mpmc = []
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rq-striped = []
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[dependencies]
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libc = "0.2"
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[target.'cfg(loom)'.dependencies]
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loom = "0.7"
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[dev-dependencies]
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libc = "0.2"
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tokio = { version = "1", features = ["rt", "rt-multi-thread", "macros", "sync", "time"] }
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[profile.dev]
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panic = "unwind"
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[profile.release]
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panic = "unwind"
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lto = "thin"
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codegen-units = 1
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[[bench]]
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name = "primes"
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harness = false
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[[bench]]
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name = "multi_scheduler"
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harness = false
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[[bench]]
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name = "general"
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harness = false
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[[bench]]
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name = "smarm_favored"
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harness = false
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[[bench]]
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name = "tokio_favored"
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harness = false
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[[bench]]
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name = "rq_micro"
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harness = false
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[[bench]]
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name = "rq_runtime"
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harness = false
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[[bench]]
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name = "switch_cost"
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harness = false
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