Fr0zkaandClaude Opus 5.5
303b7b9f24
Clang -ffp-contract=on/fast and GCC's default (fast) all change the density hash on the L1 view; contraction off reproduces L1 (= Windows S13) at W1/W12. Seed sweep: 48 FloatingIslands seeds and 14 effective SurfaceWorld seeds (34 of 48 fell on a seed-independent cube) match across Clang/GCC and W1/W12. Standalone gains --seed/--recipe/--render-distance-chunks (viewer + headless) and a Windows replay script. Linux standalone workers get 32 MiB pthread stacks (TLS is 17.3 MiB/thread), so no external stack limit is needed. No Core or world-output change; MSVC compile unverified. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
35 lines
1.4 KiB
Python
35 lines
1.4 KiB
Python
#!/usr/bin/env python3
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"""Run one child and print its wait4 peak RSS under the Linux2 process limits."""
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import os
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import resource
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import sys
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import time
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if len(sys.argv) < 2:
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raise SystemExit("usage: MeasureProcess.py executable [arguments ...]")
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address_limit, _ = resource.getrlimit(resource.RLIMIT_AS)
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stack_limit, _ = resource.getrlimit(resource.RLIMIT_STACK)
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if address_limit in (resource.RLIM_INFINITY, -1) or address_limit > 6 * 1024**3:
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raise SystemExit("run under prlimit --as=6442450944")
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if stack_limit in (resource.RLIM_INFINITY, -1) or stack_limit < 8 * 1024**2:
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raise SystemExit("run with the ordinary process stack limit of at least 8 MiB")
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if not os.sched_getaffinity(0).issubset(set(range(12))):
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raise SystemExit("run under taskset -c 0-11")
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print(f"[ProcessLimits] address_limit={address_limit} stack_limit={stack_limit} affinity={sorted(os.sched_getaffinity(0))}", flush=True)
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started = time.monotonic()
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pid = os.fork()
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if pid == 0:
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try:
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os.execvp(sys.argv[1], sys.argv[1:])
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except OSError as error:
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print(f"MeasureProcess: exec failed: {error}", file=sys.stderr, flush=True)
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os._exit(127)
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_, status, usage = os.wait4(pid, 0)
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wall = time.monotonic() - started
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exit_code = os.waitstatus_to_exitcode(status)
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print(f"[ProcessResources] exit_code={exit_code} wall_s={wall:.6f} peak_rss_kib={usage.ru_maxrss}")
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raise SystemExit(exit_code)
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