reduce the lock contention in task spawn. #7008

	name: Stress Test
	on:
	pull_request:
	push:
	branches:
	- master

	concurrency:
	group: ${{ github.workflow }}-${{ github.event.pull_request.number \|\| github.sha }}
	cancel-in-progress: true

	env:
	RUSTFLAGS: -Dwarnings
	RUST_BACKTRACE: 1
	# Change to specific Rust release to pin
	rust_stable: stable

	permissions:
	contents: read

	jobs:
	stress-test:
	name: Stress Test
	runs-on: ubuntu-latest
	strategy:
	matrix:
	stress-test:
	- simple_echo_tcp
	steps:
	- uses: actions/checkout@v3
	- name: Install Rust ${{ env.rust_stable }}
	uses: dtolnay/rust-toolchain@master
	with:
	toolchain: ${{ env.rust_stable }}
	- name: Install Valgrind
	uses: taiki-e/install-action@valgrind

	- uses: Swatinem/rust-cache@v2
	# Compiles each of the stress test examples.
	- name: Compile stress test examples
	run: cargo build -p stress-test --release --example ${{ matrix.stress-test }}

	# Runs each of the examples using Valgrind. Detects leaks and displays them.
	- name: Run valgrind
	run: valgrind --error-exitcode=1 --leak-check=full --show-leak-kinds=all --fair-sched=yes ./target/release/examples/${{ matrix.stress-test }}

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