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timothyye

Go 1.3 is released

  •  
  •   timothyye · Jun 19, 2014 · 2494 views
    This topic created in 4331 days ago, the information mentioned may be changed or developed.
    介绍: http://blog.golang.org/go1.3

    Go 1.3 Release Notes: http://golang.org/doc/go1.3

    跟1.2相比,golang的语法没有什么变化,而改进的是其他的一些功能,比如提供精确的GC,优化编译速度等……
    9 replies    2014-06-21 16:26:42 +08:00
    pubby
        1
    pubby  
       Jun 19, 2014
    good,坐等freebsd pkg更新

    最近上的几个go服务进程确实内存占用有些大
    Livid
        2
    Livid  
    MOD
    PRO
       Jun 19, 2014
    之前用 ab 测试某个 go 的 web 编程框架,每隔几千个请求就会有一次停顿,然后就对 go 的 gc 印象比较深刻……
    guotie
        3
    guotie  
       Jun 19, 2014
    不错,新的起点
    missdeer
        4
    missdeer  
       Jun 19, 2014
    @Livid 然后Go社区的人有没有叫你不要用ab来做压力测试?
    Livid
        5
    Livid  
    MOD
    PRO
       Jun 19, 2014
    @missdeer 我没和人讨论过这个事情,只是一直对这个事情印象比较深刻……
    fx
        6
    fx  
       Jun 19, 2014
    @Livid gc现在还是stop the world
    cnbuff410
        7
    cnbuff410  
       Jun 19, 2014 via Android
    "The garbage collector has been sped up, using a concurrent sweep algorithm, better parallelization, and larger pages. The cumulative effect can be a 50-70% reduction in collector pause time."
    Virtao
        8
    Virtao  
       Jun 19, 2014
    Go确实还有很大的改进空间,不过底子比较好,只要方向没问题,很有前景。这次1.3正则库效率也有所提高,之前效率是PCRE的十分之一
    pubby
        9
    pubby  
       Jun 21, 2014
    升级到1.3 踩坑里去了

    Reader.Read

    54 ¦ // An instance of this general case is that a Reader returning
    55 ¦ // a non-zero number of bytes at the end of the input stream may
    56 ¦ // return either err == EOF or err == nil. The next Read should
    57 ¦ // return 0, EOF regardless.


    这里确实发生变化了:
    1.2 的时候 最后一次Read 读到n byte, err == nil ,后续Read才会err == EOF
    更新到1.3, 最后一次Read 读到n byte,并且err == EOF,不需要再次Read才会碰到EOF


    之前没有严格按照文档做的恶果 ~~~55~~~,不少代码要改了
    59 ¦ // Callers should always process the n > 0 bytes returned before
    60 ¦ // considering the error err. Doing so correctly handles I/O errors
    61 ¦ // that happen after reading some bytes and also both of the
    62 ¦ // allowed EOF behaviors.
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