Askrene: scale with many layers #8760
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Simple bench. Before: Creating 20,000 layers: 32 seconds After: Creating 20,000 layers: 13 seconds Creating 50,000 layers: 30 seconds Creating 100,000 layers: 57 seconds Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
…ers on startup. We used non-persistent layers before, but what if we save to the datastore and restore? This takes it from 57 to 87 seconds. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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@Lagrang3 pointed out that our single linked list of layers will become a bottleneck, so this contains a quick benchmark for many layers, and replaces the linked list with a hashtable.
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