initial commit

.gitignore

+/target

Cargo.lock

+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
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+checksum = "190092ea657667030ac6a35e305e62fc4dd69fd98ac98631e5d3a2b1575a12b5"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.153"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c198f91728a82281a64e1f4f9eeb25d82cb32a5de251c6bd1b5154d63a8e7bd"
+
+[[package]]
+name = "multi_thread"
+version = "0.1.0"
+dependencies = [
+ "rand",
+]
+
+[[package]]
+name = "ppv-lite86"
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+
+[[package]]
+name = "rand"
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+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_chacha"
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+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
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+dependencies = [
+ "getrandom",
+]
+
+[[package]]
+name = "wasi"
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Cargo.toml

+[package]
+name = "multi_thread"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rand = "0.8.5"

src/main.rs

+use rand::{self, Rng};
+use std::{
+    thread::{self, JoinHandle},
+    time::Instant,
+};
+
+fn th_run() {
+    let mut random = rand::thread_rng();
+    let mut arr = vec![0u8; 1_000_000];
+    for _ in 0..100 {
+        for i in 0..1_000_000 {
+            arr[i] = random.gen();
+        }
+    }
+    println!("th_run: end");
+}
+
+fn main() {
+    let start = Instant::now();
+    // th_run();
+    // th_run();
+
+    let mut thread_list: Vec<JoinHandle<()>> = vec![];
+    for _ in 0..2 {
+        let t = thread::spawn(move || {
+            th_run();
+        });
+        thread_list.push(t);
+    }
+
+    println!("count: {}", thread_list.len());
+
+    for th in thread_list {
+        th.join().unwrap();
+    }
+
+    println!("{:?}", start.elapsed());
+}