Say what TPC-C costs when SQLite commits in groups too, and with four warehouses (106)

SQLite tuned first, by the criteria committed before (and, beyond them,
checkpoints each 40 MB of WAL, in its favour). On the SD card Pure stays
4.2-10.8x ahead at equal terminals, SQLite writing 8-18x the bytes a
transaction; in RAM 3.2-3.5x. All tables equal at W=1 and W=4, and
every run consistent. In RAM the one owner is the limit (0.94 of a core
at W=4, no gain from 16 to 64 terminals), a third of its busy time
copying nodes the snapshots share; checkpoints and memory are within
their criteria.

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