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gossipd: make more compact getchannels entries.

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We can save significant space by combining both sides: so much that we
can reduce the WIRE_LEN_LIMIT to something sane again.

MCP results from 5 runs, min-max(mean +/- stddev):
	store_load_msec:34467-36764(35517.8+/-7.7e+02)
	vsz_kb:2637488
	store_rewrite_sec:35.310000-36.580000(35.816+/-0.44)
	listnodes_sec:1.140000-2.780000(1.596+/-0.6)
	listchannels_sec:55.390000-58.110000(56.998+/-0.99)
	routing_sec:30.330000-30.920000(30.642+/-0.19)
	peer_write_all_sec:50.640000-53.360000(51.822+/-0.91)

MCP notable changes from previous patch (>1 stddev):
	-store_rewrite_sec:34.720000-35.130000(34.94+/-0.14)
	+store_rewrite_sec:35.310000-36.580000(35.816+/-0.44)

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2019-04-08 19:28:44 +09:30
committed by neil saitug
parent 91849dddc4
commit 0b484b111e
6 changed files with 157 additions and 102 deletions
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1
tools/generate-wire.py
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@@ -37,6 +37,7 @@ type2size = {
varlen_structs = [
'peer_features',
'gossip_getnodes_entry',
'gossip_getchannels_entry',
'failed_htlc',
'utxo',
'bitcoin_tx',