This takes an extra 8 bytes per channel, but means we can go back and
get more information about them; this is implemented in
gossmap_chan_get_update_details() which is what listchannels will need.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Now we create a separate set of local mods, and apply and unapply it.
This is more efficient than the previous approach, since we can do
some work up-front. It's also more graceful (and well-defined) when a
local modification overlaps an existing one.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
1. One place returned false instead of -1.
2. The names implied it returned a bool, and it doesn't.
Fix both, and curse C's loose typing a little.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
I went overboard on optimization. I am so sorry:
1. Squeezed channel min/max into 16 bits.
2. Uses mmap and leaves node_ids in the file.
3. Uses offsets instead of pointers where possible.
4. Uses custom free-list to allocate inside arrays.
5. Ignores our autogenerated marshalling code in favor of direct derefs.
6. Carefully aligns everything so we use minimal ram.
The result is that the current gossip_store:
- load time (-O3 -flto laptop): 40msec
- load time (-g laptop i.e. DEVELOPER=0): 60msec
- load time (-O0 laptop i.e. DEVELOPER=1): 110msec
- Total memory: 2.6MB:
- 1.5MB for the array of channels
- 512k for the channel htable to map scid -> channel.
- 320k for the node htable to map nodeid -> node.
- 192k for the array of channels inside each node
- 94k for the array of nodes
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
