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news 2025/10/4 14:22:13

社区门户网站规范化建设,网站设计论文总结,wordpress电影豆瓣,深圳我的网站听说google出品的go语言也是系统开发中常用的，性能到底怎么样，还是老办法，让DeepSeek写个程序跑一下，基于以往的经验，直接让它同时编写有缓冲和无缓冲版本。 package mainimport ("bufio""fmt"&qu…

听说google出品的go语言也是系统开发中常用的，性能到底怎么样，还是老办法，让DeepSeek写个程序跑一下，基于以往的经验，直接让它同时编写有缓冲和无缓冲版本。

package mainimport ("bufio""fmt""os""sort""time"
)// 无缓冲版本
func unbufferedSort(filename string) error {lines, err := readLines(filename)if err != nil {return err}sort.Strings(lines) // Go标准库的优化排序for _, line := range lines {fmt.Println(line) // 无缓冲直接输出}return nil
}// 带缓冲版本 (默认4MB缓冲区)
func bufferedSort(filename string, bufferSize int) error {lines, err := readLines(filename)if err != nil {return err}sort.Strings(lines)// 创建缓冲写入器writer := bufio.NewWriterSize(os.Stdout, bufferSize)defer writer.Flush()for _, line := range lines {_, err := writer.WriteString(line + "\n")if err != nil {return err}}return nil
}// 通用文件读取函数
func readLines(filename string) ([]string, error) {file, err := os.Open(filename)if err != nil {return nil, err}defer file.Close()var lines []stringscanner := bufio.NewScanner(file)for scanner.Scan() {lines = append(lines, scanner.Text())}return lines, scanner.Err()
}func main() {if len(os.Args) < 3 {fmt.Println("Usage:")fmt.Println("  sort_lines <filename> <mode> [bufferSize]")fmt.Println("Modes: unbuffered, buffered")os.Exit(1)}filename := os.Args[1]mode := os.Args[2]start := time.Now()var err errorswitch mode {case "unbuffered":err = unbufferedSort(filename)case "buffered":bufferSize := 4 * 1024 * 1024 // 默认4MBif len(os.Args) > 3 {_, err = fmt.Sscanf(os.Args[3], "%d", &bufferSize)if err != nil {fmt.Printf("Invalid buffer size: %v\n", err)os.Exit(1)}}err = bufferedSort(filename, bufferSize)default:fmt.Println("Invalid mode")os.Exit(1)}if err != nil {fmt.Printf("Error: %v\n", err)os.Exit(1)}elapsed := time.Since(start)fmt.Fprintf(os.Stderr, "Processing time: %s\n", elapsed)
}

编译执行

go/bin/go build -o gosort sort_lines.go
time ./gosort varchar.txt buffered > /dev/null
Processing time: 3.497140997sreal    0m3.554s
user    0m0.621s
sys     0m0.366s
time ./gosort varchar.txt unbuffered > /dev/null
Processing time: 3.720407838sreal    0m4.603s
user    0m0.755s
sys     0m0.474s
time ./gosort varchar.txt buffered > vcc.txt
Processing time: 3.798995799sreal    0m3.855s
user    0m0.681s
sys     0m0.301stime ./gosort varchar.txt buffered 65536 > vcc.txt
Processing time: 3.891683917sreal    0m3.959s
user    0m0.627s
sys     0m0.380stime ./gosort varchar.txt unbuffered > vcc.txt
^Creal    1m26.182s
user    0m3.305s
sys     0m7.983s
nm -D gosort >go.h
nm: gosort: no symbols
nm gosort >go.h