It usually means we're missing something, but there's no way to ask what.
Simply start a broad scid probe.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We assume that the time for gossip propagation is < 10 minutes, so by
going back that far from last gossip we won't miss anything,
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
It's simple: if we wouldn't accept the timestamp we see, don't put
the channel in the stale_scid_map.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Since we have to validate, there can be a delay (and peer might
vanish) between receiving the gossip and actually confirming it, hence
the use of softref.
We will use this information to check that the peers are making progress
as we start asking them for specific information.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We do this by keeping a current and an old map, and moving the current to old
every hour or 10,000 entries.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
I was seeing some accidental pruning under load / Travis, and in
particular we stopped accepting channel_updates because they were 103
seconds old. But making it too long makes the prune test untenable,
so restore a separate flag that this test can use.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
The first one means we don't discard channels just because we're not
synced, and the second is implied by the spec: don't accept
channel_announcement if the channel isn't 6 deep. Since LND defers in
such cases, we do too (unless it's newer than the current block, in
which case we simply discard). Otherwise there's a risk that a slow
node might discard valid gossip.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
It's generally clearer to have simple hardcoded numbers with an
#if DEVELOPER around it, than apparent variables which aren't, really.
Interestingly, our pruning test was always kinda broken: we have to pass
two cycles, since l2 will refresh the channel once to avoid pruning.
Do the more obvious thing, and cut the network in half and check that
l1 and l3 time out.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Make update_local_channel use a timer if it's too soon to make another
update.
1. Implement cupdate_different() which compares two updates.
2. make update_local_channel() take a single arg for timer usage.
3. Set timestamp of non-disable update back 5 minutes, so we can
always generate a disable update if we need to.
4. Make update_local_channel() itself do the "unchanged update" suppression.
gossipd: clean up local channel updates.
5. Keep pointer to the current timer so we override any old updates with
a new one, to avoid a race.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Normally we'd put a pointer into struct half_chan for local
information, but it would be NULL on 99.99% of nodes. Instead, keep a
separate hash table.
This immediately subsumes the previous "map of local-disabled
channels", and will be enhanced further.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We've been slack, but it's going to be important for testing
ratelimiting. And it currently has a minor memory leak.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Rather than reaching into data structures, let them register their own
callbacks. This avoids us having to expose "memleak_remove_xxx"
functions, and call them manually.
Under the hood, this is done by having a specially-named tal child of
the thing we want to assist, containing the callback.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
`make update-mocks` is usually run in DEVELOPER mode, but then it includes
definitions for functions which aren't declared in non-DEVELOPER mode.
We hacked this in a few places, but it's fragile, and worst, now we
have EXPERIMENTAL_FEATURES as well, it's complex.
Instead, declare developer-only functions (but don't define them).
This is a bit more awkward if you accidentally use one in
non-DEVELOPER code (link error rather than compile error), but makes
autogenerating test mocks much easier.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
The crashes in #2750 are mostly caused by us trying to partially truncate
the store. The simplest fix for release is to discard the whole thing if
we detect a problem.
This is a workaround: it'd be far nicer to try to recover.
Fixes: #2750
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We might have channel_announcements which have no channel_update: normally
these don't get written into the store until there is one, but if the
store was truncated it can happen. We then get upset on compaction, since
we don't have an in-memory representation of the channel_announcement.
Similarly, we leave the node_announcement pending until after that
channel_announcement, leading to a similar case.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
In particular, we'll need to know the short_channel_id if a
channel_update is unknown (implies we're missing a channel), and whether
processing a pending channel_announcement was successful (implies that
the channel was real).
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This clarifies things a fair bit: we simply add and remove from the
gossip_store directly.
Before this series: (--disable-developer, -Og)
store_load_msec:20669-20902(20822.2+/-82)
vsz_kb:439704-439712(439706+/-3.2)
listnodes_sec:0.890000-1.000000(0.92+/-0.04)
listchannels_sec:11.960000-13.380000(12.576+/-0.49)
routing_sec:3.070000-5.970000(4.814+/-1.2)
peer_write_all_sec:28.490000-30.580000(29.532+/-0.78)
After: (--disable-developer, -Og)
store_load_msec:19722-20124(19921.6+/-1.4e+02)
vsz_kb:288320
listnodes_sec:0.860000-0.980000(0.912+/-0.056)
listchannels_sec:10.790000-12.260000(11.65+/-0.5)
routing_sec:2.540000-4.950000(4.262+/-0.88)
peer_write_all_sec:17.570000-19.500000(18.048+/-0.73)
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We use the high bit of the length field: this way we can still check
that the checksums are valid on deleted fields.
Once this is done, serially reading the gossip_store file will result
in a complete, ordered, minimal gossip broadcast. Also, the horrible
corner case where we might try to delete things from the store during
load time is completely gone: we only load non-deleted things.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Each destructor2 costs 40 bytes, and struct chan is only 120 bytes. So
this drops our memory usage quite a bit:
MCP bench results change:
-vsz_kb:580004-580016(580006+/-4.8)
+vsz_kb:533148
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We now have a test blockchain for MCP which has the correct channels,
so this is not needed.
Also fix a benchmark script bug where 'mv "$DIR"/log
"$DIR"/log.old.$$' would fail if you log didn't exist from a previous run.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Now we can benchmark, and remove 500 bytes per node.
MCP results from 5 runs, min-max(mean +/- stddev):
store_load_msec:35093-37907(36146+/-1.1e+03)
vsz_kb:555168
store_rewrite_sec:12.120000-13.750000(12.7+/-0.6)
listnodes_sec:1.270000-1.370000(1.322+/-0.039)
listchannels_sec:29.770000-31.600000(30.82+/-0.64)
routing_sec:0.00
peer_write_all_sec:63.630000-67.850000(65.432+/-1.7)
MCP notable changes from pre-Dijkstra (>1 stddev):
-vsz_kb:577456
+vsz_kb:555168
-routing_sec:60.70
+routing_sec:12.04
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Use a uintmap as our minheap.
Note that Dijkstra can give overlength routes, so some checks are disabled.
Comparison using gossipd/test/run-bench-find_route 100000 10:
Before:
10 (10 succeeded) routes in 100000 nodes in 120087 msec (12008708402 nanoseconds per route)
After:
10 (10 succeeded) routes in 100000 nodes in 2269 msec (226925462 nanoseconds per route)
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
When we compact the store, we need to adjust the broadast index for
peers so they know where they're up to.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This requires some trickiness when we want to re-add unannounced channels
to the store after compaction, so we extract a common "copy_message" to
transfer from old store to new.
MCP results from 5 runs, min-max(mean +/- stddev):
store_load_msec:36034-37853(37109.8+/-5.9e+02)
vsz_kb:577456
store_rewrite_sec:12.490000-13.250000(12.862+/-0.27)
listnodes_sec:1.250000-1.480000(1.364+/-0.09)
listchannels_sec:30.820000-31.480000(31.068+/-0.24)
routing_sec:26.940000-27.990000(27.616+/-0.39)
peer_write_all_sec:65.690000-68.600000(66.698+/-0.99)
MCP notable changes from previous patch (>1 stddev):
-vsz_kb:1202316
+vsz_kb:577456
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
The txout_script field is unused; the local_disable only applies to
the handful of local channels, so move that into a hash table.
MCP results from 5 runs, min-max(mean +/- stddev):
store_load_msec:39207-45089(41374.6+/-2.2e+03)
vsz_kb:1202316
store_rewrite_sec:15.090000-16.790000(15.654+/-0.63)
listnodes_sec:1.290000-3.790000(1.938+/-0.93)
listchannels_sec:30.190000-32.120000(31.31+/-0.69)
routing_sec:28.220000-31.340000(29.314+/-1.2)
peer_write_all_sec:66.830000-76.850000(71.976+/-3.6)
MCP notable changes from previous patch (>1 stddev):
-store_load_msec:35107-37944(36686+/-1e+03)
+store_load_msec:39207-45089(41374.6+/-2.2e+03)
-vsz_kb:1218036
+vsz_kb:1202316
-listchannels_sec:28.510000-30.270000(29.6+/-0.6)
+listchannels_sec:30.190000-32.120000(31.31+/-0.69)
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We used to have a `struct chan` while we're waiting for an update; now we
keep that internally. So a `struct chan` without a channel_announcement
in the store is private, and other is public.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Reload them from disk if they do listnodes.
MCP results from 5 runs, min-max(mean +/- stddev):
store_load_msec:35390-38659(37336.4+/-1.3e+03)
vsz_kb:1780516
store_rewrite_sec:13.800000-16.800000(15.02+/-0.98)
listnodes_sec:1.280000-1.530000(1.382+/-0.096)
listchannels_sec:28.700000-30.440000(29.34+/-0.68)
routing_sec:30.120000-31.080000(30.526+/-0.35)
peer_write_all_sec:65.910000-76.850000(69.462+/-4.1)
MCP notable changes from previous patch (>1 stddev):
-vsz_kb:1792996
+vsz_kb:1780516
-listnodes_sec:1.030000-1.120000(1.068+/-0.032)
+listnodes_sec:1.280000-1.530000(1.382+/-0.096)
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We currently create a struct chan when we receive a `channel_announcement`,
but we can only broadcast once we have a `channel_update` (since that
provides the timestamp).
This means a `struct chan` can be in a weird state where it exists,
but is unusable (can't use without an update), and also means we need to
keep the channel_announcement message around until an update arrives, so
we can put it in the gossip_store.
Instead, keep track of these "unupdated" channels separately, and check
for them in all the places we search for a specific channel to update.
MCP results from 5 runs, min-max(mean +/- stddev):
store_load_msec:30640-33236(32202+/-8.7e+02)
vsz_kb:1812956
store_rewrite_sec:13.410000-16.970000(14.438+/-1.3)
listnodes_sec:0.590000-0.660000(0.62+/-0.033)
listchannels_sec:28.140000-29.560000(28.816+/-0.56)
routing_sec:29.530000-32.590000(30.352+/-1.1)
peer_write_all_sec:60.380000-61.320000(60.836+/-0.37)
MCP notable changes from previous patch (>1 stddev):
-vsz_kb:1812904
+vsz_kb:1812956
-store_rewrite_sec:21.390000-27.070000(23.596+/-2.4)
+store_rewrite_sec:13.410000-16.970000(14.438+/-1.3)
-listnodes_sec:1.120000-1.230000(1.176+/-0.044)
+listnodes_sec:0.590000-0.660000(0.62+/-0.033)
-listchannels_sec:38.900000-50.580000(44.716+/-3.9)
+listchannels_sec:28.140000-29.560000(28.816+/-0.56)
-routing_sec:45.080000-48.160000(46.814+/-1.1)
+routing_sec:29.530000-32.590000(30.352+/-1.1)
-peer_write_all_sec:58.780000-87.150000(72.278+/-9.7)
+peer_write_all_sec:60.380000-61.320000(60.836+/-0.37)
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Instead of an arbitrary counter, we can use the file offset for our
partial ordering, removing a field. It takes some care when we compact
the store, however, as this field changes.
MCP results from 5 runs, min-max(mean +/- stddev):
store_load_msec:34271-35283(34789.6+/-3.3e+02)
vsz_kb:2288784
store_rewrite_sec:38.060000-39.130000(38.426+/-0.39)
listnodes_sec:0.750000-0.850000(0.794+/-0.042)
listchannels_sec:30.740000-31.760000(31.096+/-0.35)
routing_sec:29.600000-33.560000(30.472+/-1.5)
peer_write_all_sec:49.220000-52.690000(50.892+/-1.3)
MCP notable changes from previous patch (>1 stddev):
-store_load_msec:35685-38538(37090.4+/-9.1e+02)
+store_load_msec:34271-35283(34789.6+/-3.3e+02)
-vsz_kb:2288768
+vsz_kb:2288784
-peer_write_all_sec:51.140000-58.350000(55.69+/-2.4)
+peer_write_all_sec:49.220000-52.690000(50.892+/-1.3)
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This is more compact, but also required once we replace the arbitrary
"index" with an actual offset into the gossip store. That will let us
remove the in-memory variants entirely.
MCP results from 5 runs, min-max(mean +/- stddev):
store_load_msec:35685-38538(37090.4+/-9.1e+02)
vsz_kb:2288768
store_rewrite_sec:35.530000-41.230000(37.904+/-2.3)
listnodes_sec:0.720000-0.810000(0.762+/-0.041)
listchannels_sec:30.750000-35.990000(32.704+/-2)
routing_sec:29.570000-34.010000(31.374+/-1.8)
peer_write_all_sec:51.140000-58.350000(55.69+/-2.4)
MCP notable changes from previous patch (>1 stddev):
-vsz_kb:2621808
+vsz_kb:2288768
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We used an s64 so we could use -1 and save a check, but that's just
silly as we have adjacent non-u64 fields: wastes 7 bytes per node
and 16 per channel.
Interestingly, this seemed to make us a little slower for some reason.
MCP results from 5 runs, min-max(mean +/- stddev):
store_load_msec:35569-38776(37169.8+/-1.2e+03)
vsz_kb:2621808
store_rewrite_sec:35.870000-40.290000(38.14+/-1.6)
listnodes_sec:0.740000-0.800000(0.768+/-0.023)
listchannels_sec:29.820000-32.730000(30.972+/-0.99)
routing_sec:30.110000-30.590000(30.346+/-0.18)
peer_write_all_sec:52.420000-59.160000(54.692+/-2.5)
MCP notable changes from previous patch (>1 stddev):
-store_load_msec:32825-36365(34615.6+/-1.1e+03)
+store_load_msec:35569-38776(37169.8+/-1.2e+03)
-vsz_kb:2637488
+vsz_kb:2621808
-store_rewrite_sec:35.150000-36.200000(35.59+/-0.4)
+store_rewrite_sec:35.870000-40.290000(38.14+/-1.6)
-listnodes_sec:0.590000-0.710000(0.682+/-0.046)
+listnodes_sec:0.740000-0.800000(0.768+/-0.023)
-peer_write_all_sec:49.020000-52.890000(50.376+/-1.5)
+peer_write_all_sec:52.420000-59.160000(54.692+/-2.5)
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
I tried to just do gossipd, but it was uncontainable, so this ended up being
a complete sweep.
We didn't get much space saving in gossipd, even though we should save
24 bytes per node.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Allocating a htable is overkill for most nodes; we can fit 11 pointers
in the same space (10, since we use 1 to indicate we're using an array).
MCP results from 5 runs, min-max(mean +/- stddev):
store_load_msec:45947-47016(46683.4+/-4e+02)
vsz_kb:2639240
store_rewrite_sec:46.950000-49.830000(48.048+/-0.95)
listnodes_sec:1.090000-1.350000(1.196+/-0.095)
listchannels_sec:48.960000-57.640000(53.358+/-2.8)
routing_sec:29.990000-33.880000(31.088+/-1.4)
peer_write_all_sec:49.360000-53.210000(51.338+/-1.4)
MCP notable changes from previous patch (>1 stddev):
- vsz_kb:2641316
+ vsz_kb:2639240
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Makes the next step easier.
MCP results from 5 runs, min-max(mean +/- stddev):
store_load_msec:45791-46917(46330.4+/-3.6e+02)
vsz_kb:2641316
store_rewrite_sec:47.040000-48.720000(47.684+/-0.57)
listnodes_sec:1.140000-1.340000(1.2+/-0.072)
listchannels_sec:50.970000-54.250000(52.698+/-1.3)
routing_sec:29.950000-31.010000(30.332+/-0.37)
peer_write_all_sec:51.570000-52.970000(52.1+/-0.54)
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This lets us benchmark without a valid blockchain.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Header from folded patch 'fixup!_gossipd__dev_option_to_allow_unknown_channels.patch':
fixup! gossipd: dev option to allow unknown channels.
Suggested-by: @cdecker
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
For giant nodes, it seems we spend a lot of time memmoving this array.
Normally we'd go for a linked list, but that's actually hard: each
channel has two nodes, so needs two embedded list pointers, and when
iterating there's no good way to figure out which embedded pointer
we'd be using.
So we (ab)use htable; we don't really need an index, but it's good for
cache-friendly iteration (our main operation). We can actually change
to a hybrid later to avoid the extra allocation for small nodes.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
If we asked `bitcoind` for a txout and it failed we were not storing that
information anywhere, meaning that when we see the channel announcement the
next time we'd be reaching out to `lightningd` and `bitcoind` again, just to
see it fail again. This adds an in-memory cache for these failures so we can
just ignore these the next time around.
Fixes#2503
Signed-off-by: Christian Decker <decker.christian@gmail.com>
Rusty Russell
trueptolemy
trueptolemy
Christian Decker