smarm
72f5d38e5d
Three changes, each independently measured, landed together. Fuse pre-resume mutex acquisitions ----------------------------------- The schedule loop previously took the shared lock three separate times per actor resume: once to pop the run queue, once to read the stack pointer, and once to pop the first-resume closure. These are now a single acquisition that returns everything needed to resume the actor. As a side effect, pending_closures was changed from a Vec<(Pid, Closure)> with O(n) linear scan to a Vec<Option<Closure>> indexed by slot index, making first-closure lookup O(1). Move stack allocation outside the shared lock ---------------------------------------------- Stack::new() (mmap + mprotect) was previously called inside with_shared, stalling every other scheduler thread for the duration of two syscalls on every spawn. It now runs before the lock is acquired. Stack pool ---------- Rather than munmap-ing a stack when an actor finishes and mmap-ing a fresh one on the next spawn, stacks are now recycled through a per-Runtime pool (Mutex<Vec<Stack>>). finalize_actor extracts the stack from the Actor before clearing the slot and pushes it to the pool outside the shared lock. spawn_under pops from the pool before falling back to Stack::new(). The pool is unbounded for now (shrink policy TBD) but capped at stack_pool_cap stacks on return, defaulting to thread_count * 4. The cap is configurable via Config::stack_pool_cap(n). Results (24-thread, against stored baseline) -------------------------------------------- chained_spawn smarm 1-thread: 9763 → 261 µs (-97%) chained_spawn smarm 24-thread: 23562 → 838 µs (-96%) ping_pong_oneshot smarm 1-thread: 18409 → 742 µs (-96%) ping_pong_oneshot smarm 24-thread: 44596 → 1425 µs (-97%) catch_unwind_panics smarm 24-thread: 267812 → 124094 µs (-54%) fan_out_compute smarm 24-thread: 2839 → 2226 µs (-22%) Tokio regressions in the checker output are baseline measurement drift; no tokio code was changed.
186 lines
3.4 KiB
JSON
186 lines
3.4 KiB
JSON
{
|
|
"chained_spawn": {
|
|
"smarm 1-thread": {
|
|
"result": 1000,
|
|
"median": 273,
|
|
"min": 261,
|
|
"max": 292
|
|
},
|
|
"smarm 24-thread": {
|
|
"result": 1000,
|
|
"median": 837,
|
|
"min": 788,
|
|
"max": 913
|
|
},
|
|
"tokio current_thread": {
|
|
"result": 1000,
|
|
"median": 68,
|
|
"min": 61,
|
|
"max": 113
|
|
},
|
|
"tokio multi-thread": {
|
|
"result": 1000,
|
|
"median": 200,
|
|
"min": 176,
|
|
"max": 230
|
|
}
|
|
},
|
|
"yield_many": {
|
|
"smarm 1-thread": {
|
|
"result": 200000,
|
|
"median": 19465,
|
|
"min": 19299,
|
|
"max": 20007
|
|
},
|
|
"smarm 24-thread": {
|
|
"result": 200000,
|
|
"median": 163921,
|
|
"min": 155700,
|
|
"max": 167921
|
|
},
|
|
"tokio current_thread": {
|
|
"result": 200000,
|
|
"median": 5022,
|
|
"min": 5001,
|
|
"max": 5530
|
|
},
|
|
"tokio multi-thread": {
|
|
"result": 200000,
|
|
"median": 8341,
|
|
"min": 7412,
|
|
"max": 9199
|
|
}
|
|
},
|
|
"fan_out_compute": {
|
|
"smarm 1-thread": {
|
|
"result": 33860,
|
|
"median": 14096,
|
|
"min": 13982,
|
|
"max": 17406
|
|
},
|
|
"smarm 24-thread": {
|
|
"result": 33860,
|
|
"median": 2475,
|
|
"min": 2264,
|
|
"max": 2589
|
|
},
|
|
"tokio current_thread": {
|
|
"result": 33860,
|
|
"median": 12640,
|
|
"min": 12548,
|
|
"max": 15881
|
|
},
|
|
"tokio multi-thread": {
|
|
"result": 33860,
|
|
"median": 1483,
|
|
"min": 1395,
|
|
"max": 1710
|
|
}
|
|
},
|
|
"ping_pong_oneshot": {
|
|
"smarm 1-thread": {
|
|
"result": 1000,
|
|
"median": 801,
|
|
"min": 720,
|
|
"max": 929
|
|
},
|
|
"smarm 24-thread": {
|
|
"result": 1000,
|
|
"median": 1449,
|
|
"min": 1292,
|
|
"max": 1530
|
|
},
|
|
"tokio current_thread": {
|
|
"result": 1000,
|
|
"median": 398,
|
|
"min": 369,
|
|
"max": 407
|
|
},
|
|
"tokio multi-thread": {
|
|
"result": 1000,
|
|
"median": 10497,
|
|
"min": 9238,
|
|
"max": 11961
|
|
}
|
|
},
|
|
"deep_recursion": {
|
|
"smarm 1-thread": {
|
|
"result": 1,
|
|
"median": 136,
|
|
"min": 117,
|
|
"max": 163
|
|
},
|
|
"smarm 24-thread": {
|
|
"result": 1,
|
|
"median": 743,
|
|
"min": 654,
|
|
"max": 845
|
|
},
|
|
"tokio current_thread": {
|
|
"result": 1,
|
|
"median": 14,
|
|
"min": 14,
|
|
"max": 16
|
|
},
|
|
"tokio multi-thread": {
|
|
"result": 1,
|
|
"median": 61,
|
|
"min": 47,
|
|
"max": 94
|
|
}
|
|
},
|
|
"yield_in_hot_loop": {
|
|
"smarm 1-thread": {
|
|
"result": 1000000,
|
|
"median": 83281,
|
|
"min": 80264,
|
|
"max": 85697
|
|
},
|
|
"tokio current_thread": {
|
|
"result": 1000000,
|
|
"median": 75538,
|
|
"min": 69842,
|
|
"max": 78823
|
|
}
|
|
},
|
|
"uncontended_channel": {
|
|
"smarm 1-thread": {
|
|
"result": 1000000,
|
|
"median": 9440,
|
|
"min": 9393,
|
|
"max": 13168
|
|
},
|
|
"tokio current_thread": {
|
|
"result": 1000000,
|
|
"median": 17817,
|
|
"min": 16926,
|
|
"max": 18572
|
|
}
|
|
},
|
|
"catch_unwind_panics": {
|
|
"smarm 1-thread": {
|
|
"result": 10000,
|
|
"median": 133840,
|
|
"min": 130425,
|
|
"max": 139709
|
|
},
|
|
"smarm 24-thread": {
|
|
"result": 10000,
|
|
"median": 128729,
|
|
"min": 108091,
|
|
"max": 132700
|
|
},
|
|
"tokio current_thread": {
|
|
"result": 10000,
|
|
"median": 10681,
|
|
"min": 10158,
|
|
"max": 11644
|
|
},
|
|
"tokio multi-thread": {
|
|
"result": 10000,
|
|
"median": 6700,
|
|
"min": 2778,
|
|
"max": 7453
|
|
}
|
|
}
|
|
} |