This is much faster to give 64 bits of data, and we don't need
cryptographic randomness.
This brings us back to 413ns per trace.
Before:
real 0m5.819000-6.472000(6.2064+/-0.26)s
user 0m3.779000-4.101000(3.956+/-0.12)s
sys 0m2.040000-2.431000(2.2496+/-0.15)s
After:
real 0m3.981000-4.247000(4.1276+/-0.11)s
user 0m3.979000-4.245000(4.126+/-0.11)s
sys 0m0.000000-0.002000(0.001+/-0.00063)s
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Fixed: lightingd: trimmed overhead of tracing infrastructure.
Any file in this directory which is executable and whose name only
consists of alphanumeric characters, space, '.', '-' or '_' will be
automatically loaded when lightningd starts (unless suppressed with
commandline options).
6a8e586ea8