WIP: Validate resource stats match real usage

test/data/memory_children.py

@@ -0,0 +1,41 @@
+#!/usr/bin/env python3
+"""Spawn child processes that each allocate a known amount of memory.
+
+Usage: memory_children.py <num_children> <mb_per_child> <hold_seconds>
+
+Each child allocates mb_per_child MB and holds it for hold_seconds.
+The parent waits for all children to finish.
+"""
+
+from __future__ import annotations
+import multiprocessing
+import sys
+import time
+
+
+def _allocate_and_hold(mb: int, seconds: float) -> None:
+    """Allocate mb megabytes and hold for seconds."""
+    data = bytearray(mb * 1024 * 1024)
+    assert data  # prevent optimization
+    time.sleep(seconds)
+
+
+def main() -> None:
+    num_children = int(sys.argv[1])
+    mb_per_child = int(sys.argv[2])
+    hold_seconds = float(sys.argv[3])
+
+    processes = []
+    for _ in range(num_children):
+        p = multiprocessing.Process(
+            target=_allocate_and_hold, args=(mb_per_child, hold_seconds)
+        )
+        p.start()
+        processes.append(p)
+
+    for p in processes:
+        p.join()
+
+
+if __name__ == "__main__":
+    main()