[0.1] Stop checking ChannelLiquidity's in-memory size
#3610
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We generally expect `ChannelLiquidity` to be exactly three cache lines to ensure the first bytes we need are all one one cache line. This improves performance very marginally on some machines, but the assertions that this is true do not work on some Android 32-bit machines due to differing `Duration` sizes. Here we simply remove the assertions to fix build on platforms where the struct size isn't exactly on cache lines. This may marginally harm performance but it shouldn't be that critical. Fixes lightningdevkit#3415
jkczyz
approved these changes
Feb 21, 2025
wpaulino
approved these changes
Feb 21, 2025
My more recent bencharks seem to show that even smarter layout than this doesn't get us the kind of win I saw previously, so I'm not sure its worth it. |
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We generally expect
ChannelLiquidityto be exactly three cache lines to ensure the first bytes we need are all one one cache line. This improves performance very marginally on some machines, but the assertions that this is true do not work on some Android 32-bit machines due to differingDurationsizes.Here we simply remove the assertions to fix build on platforms where the struct size isn't exactly on cache lines. This may marginally harm performance but it shouldn't be that critical.
Fixes #3415