From 7622c750648fe5453e83f7fa57e73732eb699638 Mon Sep 17 00:00:00 2001
From: Luca Bruno <luca.bruno@coreos.com>
Date: Mon, 17 Feb 2020 19:05:22 +0100
Subject: [PATCH] blocking: opt-out CPUs auto-detection in debug mode (#807)

This tweaks the tokio runtime checker (only used in debug mode) in
order to use a single thread.
Performing the CPUs auto-detection step on each check adds significant
syscall-tracing noise and runtime latency. This completely skips it.
---
 src/blocking/wait.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/blocking/wait.rs b/src/blocking/wait.rs
index 685572a..cfca8da 100644
--- a/src/blocking/wait.rs
+++ b/src/blocking/wait.rs
@@ -68,6 +68,7 @@ fn enter() {
     #[cfg(debug_assertions)]
     {
         tokio::runtime::Builder::new()
+            .core_threads(1)
             .build()
             .expect("build shell runtime")
             .enter(|| {});