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{
"version": 1,
"written_before_measurement": true,
"seed": 20260923,
"repeats": 5,
"policies": [
{"name": "borrow", "policy": "borrow"},
{"name": "copy", "policy": "copy"},
{"name": "shared_copy", "policy": "shared_copy"},
{"name": "threshold2", "policy": "threshold", "ratio": 2},
{"name": "threshold8", "policy": "threshold", "ratio": 8},
{"name": "compact", "policy": "compact", "ratio": 2},
{"name": "copy_no_pool", "policy": "copy", "pool": 0}
],
"cases": [
{"name": "one_slow", "shape": "large", "records": 1024, "keys": ["tag"], "hold_us": [8000], "service_us": [0], "budget": 8388608, "slots": 64},
{"name": "three_distinct_speeds", "shape": "large", "records": 1024, "keys": ["body", "tag", "tag"], "hold_us": [0, 5000, 8000], "service_us": [0, 0, 0], "budget": 8388608, "slots": 64},
{"name": "same_large_field", "shape": "large", "records": 1024, "keys": ["body", "body", "body"], "hold_us": [0, 5000, 8000], "service_us": [0, 0, 0], "budget": 8388608, "slots": 64},
{"name": "slow_large_field", "shape": "large", "records": 1024, "keys": ["tag", "tag", "body"], "hold_us": [0, 5000, 8000], "service_us": [0, 0, 0], "budget": 8388608, "slots": 64},
{"name": "mixed_tight", "shape": "mixed", "records": 1024, "keys": ["body", "tag", "tag"], "hold_us": [0, 5000, 8000], "service_us": [0, 0, 0], "budget": 2097152, "slots": 64},
{"name": "metadata_heavy", "shape": "metadata", "records": 512, "keys": ["body", "tag", "tag"], "hold_us": [0, 5000, 8000], "service_us": [0, 0, 0], "budget": 2097152, "slots": 64}
],
"expectations": [
"A slow small-field consumer can retain the input after a fast large-field consumer finishes.",
"Sharing identical compact copies can remove duplicate per-consumer copies without a new runtime.",
"Late compaction may save copied bytes or fail to beat early size-based copying; all remaining owners matter.",
"Parser temporary memory and reader growth must be charged, even when retained selections are small.",
"No novel-policy advantage or production service SLO is presumed."
],
"comparison_rule": "Report all fixed presets; exploratory measurements, no trained/held-out policy or significance claim.",
"limits": "Real yyjson parser and actual bytes, but synthetic NDJSON corpus and sink delays, three synchronous consumers in one event loop, no open-loop arrivals, thread races, durable output, or independent parser comparison."
}
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