multithreading - Perl6 多线程问题

Question

我编写了生成“随机”文本文件的程序，其中 3 个单词替换为存储在 $keysfilename 中的 key 。文件。 key 文件具有非常简单的结构，例如

ASD123ASD
QWE123QWE
XZC123ZXC

例如，当我使用多个线程时会出现问题

my @threads = (^32).map({

如果在任意文件上失败，则出现错误

    started
Thread<17>(14) got 1
Thread<18>(15) got 2
Thread<20>(17) got 17
Thread<5>(2) got 3
Thread<16>(13) got 4
Thread<21>(18) got 5
Thread<3>(0) got 6
Thread<8>(5) got 7
Thread<12>(9) got 10
Thread<11>(8) got 8
Thread<9>(6) got 9
Thread<14>(11) got 11
Thread<15>(12) got 12
Unhandled exception: Failed to open file C:\c\perltests\00000017.txt: no such file or directory
Thread<10>(7) got 13
Thread<13>(10) got 14
Thread<7>(4) got 15
Thread<19>(16) got 16
Thread<4>(1) got 0
Thread<6>(3) got 18
Thread<22>(19) got 19
   at <unknown>:1  (C:\rakudo/share/perl6/runtime/CORE.setting.moarvm:throw:4294967295)
Thread<23>(20) got 20
Thread<24>(21) got 21
 from gen/moar/m-CORE.setting:22337  (C:\rakudo/share/perl6/runtime/CORE.setting.moarvm:throw:34)
Thread<26>(23) got 22
Thread<25>(22) got 23
Thread<27>(24) got 24
 from gen/moar/m-CORE.setting:22374  (C:\rakudo/share/perl6/runtime/CORE.setting.moarvm:FALLBACK:35)
Thread<28>(25) got 25
Thread<29>(26) got 26
 from gen/moar/m-Metamodel.nqp:3041  (C:\rakudo\share\nqp\lib/Perl6/Metamodel.moarvm::13)
Thread<30>(27) got 27
Thread<16>(13) got 28
Thread<17>(14) got 29
Thread<5>(2) got 30
Thread<18>(15) got 31
Thread<14>(11) got 32
Thread<15>(12) got 33
 from gen/moar/m-CORE.setting:25189  (C:\rakudo/share/perl6/runtime/CORE.setting.moarvm:spurt:226)
Thread<30>(27) got 58
Thread<29>(26) got 57
Unhandled exception: Failed to open file C:\c\perltests\00000028.txt: no such file or directory
Thread<28>(25) got 56
 from gen/moar/m-CORE.setting:25203  (C:\rakudo/share/perl6/runtime/CORE.setting.moarvm:spurt:92)
Thread<25>(22) got 55
 from gen/moar/m-CORE.setting:25199  (C:\rakudo/share/perl6/runtime/CORE.setting.moarvm:spurt:44)
Thread<27>(24) got 54
 from gen/moar/m-CORE.setting:25506  (C:\rakudo/share/perl6/runtime/CORE.setting.moarvm:spurt:96)
Thread<26>(23) got 53
 from gentexts.pl:54  (<ephemeral file>::189)
Thread<24>(21) got 52
Thread<23>(20) got 51
Unhandled exception: Failed to open file C:\c\perltests\00000058.txt: no such file or directory
Thread<6>(3) got 50
Thread<22>(19) got 49
   at <unknown>:1  (C:\rakudo/share/perl6/runtime/CORE.setting.moarvm:throw:4294967295)
Thread<34>(31) got 48
 from gen/moar/m-CORE.setting:22337  (C:\rakudo/share/perl6/runtime/CORE.setting.moarvm:throw:34)
Thread<33>(30) got 47
Thread<4>(1) got 46
 from gen/moar/m-CORE.setting:22374  (C:\rakudo/share/perl6/runtime/CORE.setting.moarvm:FALLBACK:35)
Thread<7>(4) got 45
 from gen/moar/m-Metamodel.nqp:3041  (C:\rakudo\share\nqp\lib/Perl6/Metamodel.moarvm::13)
Thread<19>(16) got 44
Thread<11>(8) got 43
   at <unknown>:1  (C:\rakudo/share/perl6/runtime/CORE.setting.moarvm:throw:4294967295)
Thread<8>(5) got 42
 from gen/moar/m-CORE.setting:22337  (C:\rakudo/share/perl6/runtime/CORE.setting.moarvm:throw:34)
Thread<12>(9) got 41
Thread<10>(7) got 40
 from gen/moar/m-CORE.setting:25189  (C:\rakudo/share/perl6/runtime/CORE.setting.moarvm:spurt:226)
Thread<13>(10) got 39
 from gen/moar/m-CORE.setting:25203  (C:\rakudo/share/perl6/runtime/CORE.setting.moarvm:spurt:92)
Thread<31>(28) got 37
 from gen/moar/m-CORE.setting:25199  (C:\rakudo/share/perl6/runtime/CORE.setting.moarvm:spurt:44)
Thread<32>(29) got 38
Thread<9>(6) got 36
 from gentexts.pl:44  (<ephemeral file>::15)
Thread<3>(0) got 35
Thread<21>(18) got 34
 from gen/moar/m-CORE.setting:22374  (C:\rakudo/share/perl6/runtime/CORE.setting.moarvm:FALLBACK:35)
Thread<17>(14) got 59
 from gen/moar/m-CORE.setting:25506  (C:\rakudo/share/perl6/runtime/CORE.setting.moarvm:spurt:96)
Thread<5>(2) got 60
Thread<18>(15) got 61
 from gentexts.pl:54  (<ephemeral file>::189)
Thread<9>(6) got 85
Thread<32>(29) got 84
 from gen/moar/m-CORE.setting:30638  (C:\rakudo/share/perl6/runtime/CORE.setting.moarvm:THREAD-ENTRY:44)

系统 Win 10 x32, Rakudo 6.c

my $keysfilename := 'C:/c/keysfile.txt';
my $output       := 'C:/c/perltests';

my @keys = ();
for $keysfilename.IO.words {
    @keys.push($_);
}
my $len  := elems @keys;

my $lorem = q:to/END/; 
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec malesuada purus vel tincidunt eleifend. Fusce sollicitudin augue augue, et gravida dolor varius a. Vestibulum iaculis, dui iaculis iaculis molestie, tellus ante hendrerit massa, at volutpat risus metus vitae nisi. Integer neque magna, ultrices eu erat at, efficitur sollicitudin sem. Aliquam sed purus malesuada, porta est eu, rutrum neque. Quisque dolor leo, condimentum non mollis eget, tristique eget odio. Donec dignissim magna nec imperdiet iaculis. Vestibulum lorem ligula, euismod ac porttitor faucibus, rutrum eu ex.

Donec scelerisque nisi eget risus condimentum ultrices. Integer porta maximus quam, in lobortis quam fermentum eu. Morbi eu ligula consequat, aliquam sem eget, sollicitudin eros. Suspendisse potenti. Cras finibus metus et eros accumsan, id vehicula libero lobortis. Aenean vulputate lacinia urna at fringilla. Nulla id tincidunt lectus, quis accumsan lorem. In posuere magna non purus hendrerit rutrum. Maecenas in mattis tellus. Maecenas vel feugiat enim. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin convallis dapibus tellus vitae euismod. Nam eleifend dui quam, eget lobortis quam pulvinar id. Cras euismod posuere dolor non ultricies.

Ut dapibus porta faucibus. Duis velit ante, tincidunt id velit id, imperdiet egestas velit. Morbi efficitur enim dignissim interdum egestas. Vivamus eu urna condimentum, aliquam orci non, ullamcorper est. Phasellus egestas at tellus nec tristique. Fusce feugiat commodo faucibus. In hac habitasse platea dictumst. Quisque dignissim, mauris a pellentesque dictum, mauris velit tincidunt lorem, sed tincidunt libero enim vitae orci. Nam interdum, ante nec consequat vulputate, nisi turpis euismod nibh, sit amet elementum nunc diam non eros. Proin quis viverra risus. Vestibulum vestibulum diam in velit consectetur, eu elementum lacus sagittis. Morbi accumsan ac ante eget faucibus. In nec elit bibendum, tristique enim non, sodales ex. Donec sodales erat vitae odio cursus commodo.

Vestibulum felis lacus, mattis eget porta eget, mattis ut felis. Pellentesque aliquet, purus eu semper suscipit, sem ipsum euismod nunc, sed dapibus augue sem vel elit. Etiam tincidunt arcu ut nisi tempor commodo. Mauris at eros tincidunt, fringilla erat nec, sagittis ante. Integer et malesuada quam. Cras vel porta erat, sit amet efficitur erat. Praesent blandit purus quis urna consectetur, eget ultricies ipsum pulvinar. Phasellus ac molestie elit. Vestibulum et tincidunt velit. Aliquam a venenatis ipsum, nec commodo libero. Nullam eget consectetur lectus. Morbi placerat interdum erat nec interdum.

Morbi bibendum dui eu turpis pretium, eget aliquet augue aliquam. Aliquam eu dignissim mauris, vitae placerat augue. Ut sed tortor sit amet augue imperdiet rutrum. Aliquam erat volutpat. Morbi a turpis in sapien ultrices tristique. Proin quis vestibulum lorem, ut pharetra ex. Quisque tempor bibendum purus ac vehicula. Suspendisse tellus ipsum, imperdiet id sodales vel, congue a leo. Nulla gravida tincidunt nisi eu tempor. Mauris imperdiet tempor ante eget rutrum. Nam ut dui at augue laoreet mollis. Sed metus elit, viverra ac fringilla vel, fermentum et magna. Nam ligula purus, pretium vel dignissim vitae, fermentum at urna. Nullam ac ullamcorper felis. Maecenas dapibus consequat mi. 
END

my @words = $lorem.split(' ');
my $wordlen = @words.elems;

my &getNext = sub {
    my $counter = 0;
    my Lock $lock .= new;
    return sub (@filename) {
        $lock.lock;
        if ($counter < 100_000) {
            @filename[0] = $counter;
            $counter++;
        }
        $lock.unlock;
    };
}();

say "started";

my @threads = (^1).map({
    Thread.start(
        name => $_,
        sub {
            loop {              
                my @counter = (-1);
                getNext(@counter);
                last if @counter[0] < 0;
                say $*THREAD ~ " got " ~ @counter[0];
                my @copy = @words.clone;
                for (^3) {
                    my $pos = $wordlen.rand.round;
                    @copy[$pos] = @keys[$len.rand.round];
                }
                spurt sprintf($output ~ '/%08d.txt', @counter[0]), @copy.join(' ');
            }
        }
    );
}).join;

Answer 1

一些笔记。

这个:

my @keys = ();
for $keysfilename.IO.words {
    @keys.push($_);
}

真的只是这样: my @keys = $keysfilename.IO.words;
和这个: @keys[$len.rand.round]真的只是这样: @keys.pick
我不太确定你在用计数器数组做什么，似乎
就像你只想要文件 0..99999 .

您正在为每个线程在子例程内锁定。如果你
想要防止多个线程访问某些东西，请制作一个锁
并让他们每个人都用它来锁定独占代码。

您也在使用 Thread制作线程，但这确实是一个
相当低级的界面。尝试使用更高级别的结构
如果可能的话，在下降到那个水平之前。

在这种情况下，您似乎只想拆分 100,000 个文件
创建到多个线程中只是为了获得一些并行性。那里
有一些结构可以让这一切变得非常简单， hyper和 race .因为你甚至不关心文件的顺序
创建，你可以只使用种族，它会以最快的速度生产出来
尽可能。

您可以使用'degree'参数来 race说多少
您要使用的线程。 (您可能需要将 RAKUDO_MAX_THREADS 设置为
得到你想要的行为)。

my $keysfilename := 'C:/c/keysfile.txt';
my $output       := 'C:/c/perltests';

my @keys = $keysfilename.IO.words;

my $lorem = q:to/END/; 
Lorem ipsum ...
END

my @words = $lorem.split(' ');
my $wordlen = @words.elems;

[^100000].race(degree => 32).map({ 
#    say $*THREAD ~ " got " ~ $_;

    my @copy = @words;

    for (^3) {
        my $pos = $wordlen.rand.round;
        @copy[$pos] = @keys.pick;
    }

    spurt sprintf($output ~ '/%08d.txt', $_), @copy.join(' ');
});