gh-75876: Report the peak memory use of a bigmem test - #156024
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In verbose mode, report how much memory the test really used, next to how much it declared. The subprocess measures its own peak; if it died before reporting it, the parent reports what it sampled, as a lower bound. Report also the number of major page faults, if any: the test did not fit in memory, so its timing means little. Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
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In verbose mode, report how much memory the test really used, next to how much it declared:
The subprocess measures its own peak; if it died before reporting it, the parent reports what it sampled, as a lower bound.
Report also the number of major page faults, if any: the test did not fit in memory, so its timing means little.