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"""Measure native (M1) simulator throughput on the bundled demo firmware.
Run standalone (from anywhere):
python3 examples/scripts/sim_bench.py # untraced baseline
python3 examples/scripts/sim_bench.py --trace # baseline + R4 trace overhead
Reports MIPS for a fixed instruction budget -- the budget
``SimClient.continue_(timeout=1.0)`` derives from SIM_IPS = 1e6. With
``--trace`` a second run enables the exec/access trace and reports the
per-instruction slowdown, so the non-trace path can be checked for regressions.
"""
from __future__ import annotations
import argparse
import sys
import time
from pathlib import Path
ROOT = Path(__file__).resolve().parents[2]
if str(ROOT) not in sys.path:
sys.path.insert(0, str(ROOT))
import greeneye as ge
from greeneye.errors import RspTimeout
from sim.trace import Trace
DEMO = ROOT / "firmware" / "uproc_demo" / "build" / "uproc_demo.elf"
def measure(budget: int, *, trace: bool = False) -> tuple[int, float]:
"""Run a fixed instruction budget; return (instructions, seconds)."""
session = ge.launch(kernel=str(DEMO), backend="native", name="sim-bench")
machine = session.client.machine
if trace:
session.client.trace = Trace() # recorder stays null: nothing is written
try:
machine.insns = 0
started = time.perf_counter()
try:
session.client.continue_(timeout=budget / 1_000_000.0)
except RspTimeout:
pass # budget exhausted: the benchmark workload completed
elapsed = time.perf_counter() - started
banner = session.target.read_uart().splitlines()
print(f"uart: {banner[0] if banner else '<empty>'!r}")
return machine.insns, elapsed
finally:
session.close()
def main(argv: list[str] | None = None) -> int:
parser = argparse.ArgumentParser(description=__doc__.splitlines()[0])
parser.add_argument("--budget", type=int, default=1_000_000)
parser.add_argument("--trace", action="store_true", help="also measure traced throughput")
parser.add_argument("--trace-budget", type=int, default=200_000)
args = parser.parse_args(argv)
insns, elapsed = measure(args.budget)
mips = insns / elapsed / 1e6 if elapsed else float("inf")
print(f"native M1: {insns} instructions in {elapsed:.3f}s = {mips:.2f} MIPS (untraced)")
if args.trace:
t_insns, t_elapsed = measure(args.trace_budget, trace=True)
t_mips = t_insns / t_elapsed / 1e6 if t_elapsed else float("inf")
overhead = (mips / t_mips - 1.0) if t_mips else float("inf")
print(
f"native M1 trace: {t_insns} instructions in {t_elapsed:.3f}s = {t_mips:.2f} MIPS "
f"({overhead * 100:+.1f}% per-instruction vs untraced)"
)
return 0
if __name__ == "__main__":
raise SystemExit(main())
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