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013's second step is in (d9e0b68): each transport holds a window of its
output's sends. 104 measures it with the receivers down: once the window
is full a node grows by the outbox alone, 219 and 218 B a send over the
link and HTTP (399 and 534 B before).
The third step is a measurement. A checkpoint holds one list's snapshot
while it writes the image, so what it adds is what the app changed
meanwhile: nothing visible on tmpfs or for a list that fits the card's
fast writes; on the SD card, a 22.4 MB list written for about 8 s while
1,400 items a second were set left +3.0 and +4.4 MiB. The highest
resident memory was twice the state bytes, inside 013's bound (the state
and one snapshot) and its stop criterion (3x).
021's run.py takes --items, --stores (a directory on the device to
measure) and --label, and reports the peak (VmHWM).
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