feat(tvix): Switch to jemalloc r/8222

Switch tvix to using jemalloc as the default global allocator on
supported (eg, non-msvc) platforms. This gives a pretty reasonable
performance boost basically for free:

int                     time:   [24.361 µs 24.386 µs 24.418 µs]
                        change: [-19.355% -18.859% -18.527%] (p = 0.00 < 0.05)
                        Performance has improved.

merge small attrs       time:   [37.201 µs 37.328 µs 37.442 µs]
                        change: [-24.609% -24.266% -23.982%] (p = 0.00 < 0.05)
                        Performance has improved.

merge large attrs with small attrs
                        time:   [20.030 ms 20.135 ms 20.251 ms]
                        change: [-4.2811% -3.2549% -2.3807%] (p = 0.00 < 0.05)
                        Performance has improved.

hello outpath           time:   [967.91 ms 974.07 ms 983.33 ms]
                        change: [-5.5008% -4.4552% -3.4099%] (p = 0.00 < 0.05)
                        Performance has improved.

Change-Id: I6c6e6e3295ec2fca01ea28dc37bcb201cd811767
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10851
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
Autosubmit: aspen <root@gws.fyi>
Reviewed-by: flokli <flokli@flokli.de>

2 files changed, 9 insertions, 0 deletions

diff --git a/tvix/eval/Cargo.toml b/tvix/eval/Cargo.toml
index cc590791cc92..4cf8ea146cf8 100644
--- a/tvix/eval/Cargo.toml
+++ b/tvix/eval/Cargo.toml
@@ -42,6 +42,9 @@ pretty_assertions = "1.2.1"
 rstest = "0.19.0"
 tempfile = "3.3.0"
 
+[target.'cfg(not(target_env = "msvc"))'.dev-dependencies]
+tikv-jemallocator = "0.5"
+
 [features]
 default = ["impure", "arbitrary", "nix_tests"]
 
diff --git a/tvix/eval/benches/eval.rs b/tvix/eval/benches/eval.rs
index 57d4eb71b59f..1333f5018cb3 100644
--- a/tvix/eval/benches/eval.rs
+++ b/tvix/eval/benches/eval.rs
@@ -1,5 +1,11 @@
 use criterion::{black_box, criterion_group, criterion_main, Criterion};
 use itertools::Itertools;
+#[cfg(not(target_env = "msvc"))]
+use tikv_jemallocator::Jemalloc;
+
+#[cfg(not(target_env = "msvc"))]
+#[global_allocator]
+static GLOBAL: Jemalloc = Jemalloc;
 
 fn interpret(code: &str) {
     tvix_eval::Evaluation::new_pure().evaluate(code, None);