From: Matt Corallo <git@bluematt.me>
Date: Fri, 28 May 2021 14:16:20 +0000 (+0000)
Subject: Add bench profiles to Cargo.toml to force codegen-units=1
X-Git-Tag: v0.0.98~9^2~4
X-Git-Url: http://git.bitcoin.ninja/index.cgi?p=rust-lightning;a=commitdiff_plain;h=08ecb53915018b34b89e089d0517cadcd542522b

Add bench profiles to Cargo.toml to force codegen-units=1

This makes a small difference for NetworkGraph deserialization
as it enables more inlining across different files, hopefully
better matching user performance as well.

As of this commit, on an Intel 2687W v3, the serialization
benchmarks take:

test routing::network_graph::benches::read_network_graph  ... bench: 2,037,875,071 ns/iter (+/- 760,370)
test routing::network_graph::benches::write_network_graph ... bench: 320,561,557 ns/iter (+/- 176,343)
---

diff --git a/Cargo.toml b/Cargo.toml
index 597d4efb..df32ac5d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,3 +22,8 @@ panic = "abort"
 opt-level = 3
 lto = true
 panic = "abort"
+
+[profile.bench]
+opt-level = 3
+codegen-units = 1
+lto = true