完善字符串测试

Author: llgoer

r2p-fib/src/lib.rs

@@ -1,4 +1,7 @@
+#![feature(test)]
+extern crate test;
 extern crate libc;
+
 use libc::c_char;
 use std::ffi::CString;
 use std::iter;
@@ -27,4 +30,40 @@ pub extern fn text_free(s: *mut c_char) {
 		if s.is_null() {return}
 		CString::from_raw(s)
 	};
+}
+
+// rust生成
+fn rust_text_generate(length: u8) -> String {
+	let mut song = String::from("💣");
+	song.extend(iter::repeat("na ").take(length as usize));
+	song.push_str("Batman! 💣");
+
+	song
+}
+
+// cargo +nightly bench
+#[cfg(test)]
+mod tests {
+	use super::*;
+	use test::Bencher;
+
+	#[test]
+	fn test_rust_text_generate() {
+		assert_eq!(rust_text_generate(12), "💣na na na na na na na na na na na na Batman! 💣");
+	}
+
+	#[bench]
+    fn bench_text_generate(b: &mut Bencher) {
+        b.iter(|| {
+        	let result = text_generate(12);
+        	text_free(result);
+        });
+    }
+
+	#[bench]
+    fn bench_rust_text_generate(b: &mut Bencher) {
+        b.iter(|| {
+        	let _ = rust_text_generate(12);
+        });
+    }
 }

test-ffi2.php

@@ -23,6 +23,7 @@
 	$result = FFI::string($rstr); // 转成php字符串
 	$ffiDebug->text_free($rstr); // 释放掉内存
 }
+// debug在8300ns一次
 echo '[Rust]debug执行时间:' . (microtime(true) - $time_start).PHP_EOL;
 var_dump($result);
 
@@ -38,6 +39,8 @@
 	$result = FFI::string($rstr); // 转成php字符串
 	$ffiRelease->text_free($rstr); // 释放掉内存
 }
+// release基本上在1600ns一次
+// 测试在rust中每次操作在700ns一次，那就是这里的FFI转值消耗了将近1000ns
 echo '[Rust]release执行时间:' . (microtime(true) - $time_start).PHP_EOL;
 var_dump($result);
 
@@ -53,8 +56,10 @@ function text_generate($num) {
 
 $time_start = microtime(true);
 for ($i=0; $i < 1000000; $i++) { 
+	$result = "";
 	$result = text_generate(12);
 }
+// 这里计算出PHP这样一个生成字符串的操作，实际是需要270ns左右
 echo '[PHP]执行时间:' . (microtime(true) - $time_start).PHP_EOL;
 var_dump($result);
 ?>