############################################################################### ## ---------------------------------------------------------------------------- ## Parallel stream model for chaining multiple maps and greps. ## ############################################################################### package MCE::Stream; use strict; use warnings; no warnings qw( threads recursion uninitialized ); our $VERSION = '1.889'; ## no critic (BuiltinFunctions::ProhibitStringyEval) ## no critic (Subroutines::ProhibitSubroutinePrototypes) ## no critic (TestingAndDebugging::ProhibitNoStrict) use Scalar::Util qw( looks_like_number ); use MCE; use MCE::Queue; our @CARP_NOT = qw( MCE ); my $_tid = $INC{'threads.pm'} ? threads->tid() : 0; sub CLONE { $_tid = threads->tid() if $INC{'threads.pm'}; } ############################################################################### ## ---------------------------------------------------------------------------- ## Import routine. ## ############################################################################### my ($_MCE, $_def, $_params, $_tag) = ({}, {}, {}, 'MCE::Stream'); my ($_prev_c, $_prev_m, $_prev_n, $_prev_w) = ({}, {}, {}, {}); my ($_user_tasks, $_queue) = ({}, {}); sub import { my ($_class, $_pkg) = (shift, caller); my $_p = $_def->{$_pkg} = { MAX_WORKERS => 'auto', CHUNK_SIZE => 'auto', DEFAULT_MODE => 'map', }; ## Import functions. if ($_pkg !~ /^MCE::/) { no strict 'refs'; no warnings 'redefine'; *{ $_pkg.'::mce_stream_f' } = \&run_file; *{ $_pkg.'::mce_stream_s' } = \&run_seq; *{ $_pkg.'::mce_stream' } = \&run; } ## Process module arguments. while ( my $_argument = shift ) { my $_arg = lc $_argument; $_p->{MAX_WORKERS} = shift, next if ( $_arg eq 'max_workers' ); $_p->{CHUNK_SIZE} = shift, next if ( $_arg eq 'chunk_size' ); $_p->{TMP_DIR} = shift, next if ( $_arg eq 'tmp_dir' ); $_p->{FREEZE} = shift, next if ( $_arg eq 'freeze' ); $_p->{THAW} = shift, next if ( $_arg eq 'thaw' ); $_p->{INIT_RELAY} = shift, next if ( $_arg eq 'init_relay' ); $_p->{USE_THREADS} = shift, next if ( $_arg eq 'use_threads' ); $_p->{DEFAULT_MODE} = shift, next if ( $_arg eq 'default_mode' ); shift, next if ( $_arg eq 'fast' ); # ignored ## Sereal 3.015+, if available, is used automatically by MCE 1.8+. if ( $_arg eq 'sereal' ) { if ( shift eq '0' ) { require Storable; $_p->{FREEZE} = \&Storable::freeze; $_p->{THAW} = \&Storable::thaw; } next; } _croak("Error: ($_argument) invalid module option"); } _croak("Error: (DEFAULT_MODE) is not valid") if ($_p->{DEFAULT_MODE} ne 'grep' && $_p->{DEFAULT_MODE} ne 'map'); $_p->{MAX_WORKERS} = MCE::_parse_max_workers($_p->{MAX_WORKERS}); MCE::_validate_number($_p->{MAX_WORKERS}, 'MAX_WORKERS', $_tag); MCE::_validate_number($_p->{CHUNK_SIZE}, 'CHUNK_SIZE', $_tag) unless ($_p->{CHUNK_SIZE} eq 'auto'); return; } ############################################################################### ## ---------------------------------------------------------------------------- ## Gather callback to ensure chunk order is preserved during gathering. ## Also, the task end callback for when a task completes. ## ############################################################################### my ($_gather_ref, $_order_id, %_tmp); sub _preserve_order { $_tmp{$_[1]} = $_[0]; if (defined $_gather_ref) { while (1) { last unless exists $_tmp{$_order_id}; push @{ $_gather_ref }, @{ delete $_tmp{$_order_id++} }; } } else { $_order_id++; } return; } sub _task_end { my ($_mce, $_task_id, $_task_name) = @_; my $_pid = $_mce->{_init_pid}.'.'.$_mce->{_caller}; if (defined $_mce->{user_tasks}->[$_task_id + 1]) { my $n_workers = $_mce->{user_tasks}->[$_task_id + 1]->{max_workers}; my $_id = @{ $_queue->{$_pid} } - $_task_id - 1; $_queue->{$_pid}[$_id]->enqueue((undef) x $n_workers); } $_params->{task_end}->($_mce, $_task_id, $_task_name) if (exists $_params->{task_end} && ref $_params->{task_end} eq 'CODE'); return; } ############################################################################### ## ---------------------------------------------------------------------------- ## Init and finish routines. ## ############################################################################### sub init (@) { shift if (defined $_[0] && $_[0] eq 'MCE::Stream'); my $_pkg = "$$.$_tid.".caller(); $_params->{$_pkg} = (ref $_[0] eq 'HASH') ? shift : { @_ }; _croak("$_tag: (HASH) not allowed as input by this MCE model") if ( ref $_params->{$_pkg}{input_data} eq 'HASH' ); @_ = (); return; } sub finish (@) { shift if (defined $_[0] && $_[0] eq 'MCE::Stream'); my $_pkg = (defined $_[0]) ? shift : "$$.$_tid.".caller(); if ( $_pkg eq 'MCE' ) { for my $_k ( keys %{ $_MCE } ) { MCE::Stream->finish($_k, 1); } } elsif ( $_MCE->{$_pkg} && $_MCE->{$_pkg}{_init_pid} eq "$$.$_tid" ) { $_MCE->{$_pkg}->shutdown(@_) if $_MCE->{$_pkg}{_spawned}; $_gather_ref = $_order_id = undef, undef %_tmp; delete $_user_tasks->{$_pkg}; delete $_prev_c->{$_pkg}; delete $_prev_m->{$_pkg}; delete $_prev_n->{$_pkg}; delete $_prev_w->{$_pkg}; delete $_MCE->{$_pkg}; if (defined $_queue->{$_pkg}) { local $_; $_->DESTROY() for (@{ $_queue->{$_pkg} }); delete $_queue->{$_pkg}; } } @_ = (); return; } ############################################################################### ## ---------------------------------------------------------------------------- ## Parallel stream with MCE -- file. ## ############################################################################### sub run_file (@) { shift if (defined $_[0] && $_[0] eq 'MCE::Stream'); my ($_file, $_pos); my $_start_pos = (ref $_[0] eq 'HASH') ? 2 : 1; my $_pid = "$$.$_tid.".caller(); if (defined (my $_p = $_params->{$_pid})) { delete $_p->{input_data} if (exists $_p->{input_data}); delete $_p->{sequence} if (exists $_p->{sequence}); } else { $_params->{$_pid} = {}; } for my $_i ($_start_pos .. @_ - 1) { my $_r = ref $_[$_i]; if ($_r eq '' || $_r eq 'SCALAR' || $_r =~ /^(?:GLOB|FileHandle|IO::)/) { $_file = $_[$_i]; $_pos = $_i; last; } } if (defined $_file && ref $_file eq '' && $_file ne '') { _croak("$_tag: ($_file) does not exist") unless (-e $_file); _croak("$_tag: ($_file) is not readable") unless (-r $_file); _croak("$_tag: ($_file) is not a plain file") unless (-f $_file); $_params->{$_pid}{_file} = $_file; } elsif (ref $_file eq 'SCALAR' || ref($_file) =~ /^(?:GLOB|FileHandle|IO::)/) { $_params->{$_pid}{_file} = $_file; } else { _croak("$_tag: (file) is not specified or valid"); } if (defined $_pos) { pop @_ for ($_pos .. @_ - 1); } return run(@_); } ############################################################################### ## ---------------------------------------------------------------------------- ## Parallel stream with MCE -- sequence. ## ############################################################################### sub run_seq (@) { shift if (defined $_[0] && $_[0] eq 'MCE::Stream'); my ($_begin, $_end, $_pos); my $_start_pos = (ref $_[0] eq 'HASH') ? 2 : 1; my $_pid = "$$.$_tid.".caller(); if (defined (my $_p = $_params->{$_pid})) { delete $_p->{sequence} if (exists $_p->{sequence}); delete $_p->{input_data} if (exists $_p->{input_data}); delete $_p->{_file} if (exists $_p->{_file}); } else { $_params->{$_pid} = {}; } for my $_i ($_start_pos .. @_ - 1) { my $_r = ref $_[$_i]; if ($_r eq '' || $_r =~ /^Math::/ || $_r eq 'HASH' || $_r eq 'ARRAY') { $_pos = $_i; if ($_r eq '' || $_r =~ /^Math::/) { $_begin = $_[$_pos], $_end = $_[$_pos + 1]; $_params->{$_pid}{sequence} = [ $_[$_pos], $_[$_pos + 1], $_[$_pos + 2], $_[$_pos + 3] ]; } elsif ($_r eq 'HASH') { $_begin = $_[$_pos]->{begin}, $_end = $_[$_pos]->{end}; $_params->{$_pid}{sequence} = $_[$_pos]; } elsif ($_r eq 'ARRAY') { $_begin = $_[$_pos]->[0], $_end = $_[$_pos]->[1]; $_params->{$_pid}{sequence} = $_[$_pos]; } last; } } _croak("$_tag: (sequence) is not specified or valid") unless (exists $_params->{$_pid}{sequence}); _croak("$_tag: (begin) is not specified for sequence") unless (defined $_begin); _croak("$_tag: (end) is not specified for sequence") unless (defined $_end); $_params->{$_pid}{sequence_run} = undef; if (defined $_pos) { pop @_ for ($_pos .. @_ - 1); } return run(@_); } ############################################################################### ## ---------------------------------------------------------------------------- ## Parallel stream with MCE. ## ############################################################################### sub run (@) { shift if (defined $_[0] && $_[0] eq 'MCE::Stream'); my $_pkg = caller() eq 'MCE::Stream' ? caller(1) : caller(); my $_pid = "$$.$_tid.$_pkg"; if (ref $_[0] eq 'HASH' && !exists $_[0]->{code}) { $_params->{$_pid} = {} unless defined $_params->{$_pid}; for my $_p (keys %{ $_[0] }) { $_params->{$_pid}{$_p} = $_[0]->{$_p}; } shift; } my $_aref; $_aref = shift if (ref $_[0] eq 'ARRAY'); $_order_id = 1; undef %_tmp; if (defined $_aref) { $_gather_ref = $_aref; @{ $_aref } = (); } else { $_gather_ref = undef; } ## ------------------------------------------------------------------------- my (@_code, @_mode, @_name, @_wrks); my $_init_mce = 0; my $_pos = 0; my $_default_mode = $_def->{$_pkg}{DEFAULT_MODE}; while (ref $_[0] eq 'CODE' || ref $_[0] eq 'HASH') { if (ref $_[0] eq 'CODE') { push @_code, $_[0]; push @_mode, $_default_mode; } else { last if (!exists $_[0]->{code} && !exists $_[0]->{mode}); push @_code, exists $_[0]->{code} ? $_[0]->{code} : undef; push @_mode, exists $_[0]->{mode} ? $_[0]->{mode} : $_default_mode; unless (ref $_code[-1] eq 'CODE') { @_ = (); _croak("$_tag: (code) is not valid"); } if ($_mode[-1] ne 'grep' && $_mode[-1] ne 'map') { @_ = (); _croak("$_tag: (mode) is not valid"); } } if (defined (my $_p = $_params->{$_pid})) { push @_name, (ref $_p->{task_name} eq 'ARRAY') ? $_p->{task_name}->[$_pos] : undef; push @_wrks, (ref $_p->{max_workers} eq 'ARRAY') ? $_p->{max_workers}->[$_pos] : undef; } $_init_mce = 1 if ( !defined $_prev_c->{$_pid}[$_pos] || $_prev_c->{$_pid}[$_pos] != $_code[$_pos] ); $_init_mce = 1 if ( !defined $_prev_m->{$_pid}[$_pos] || $_prev_m->{$_pid}[$_pos] ne $_mode[$_pos] ); $_init_mce = 1 if ($_prev_n->{$_pid}[$_pos] ne $_name[$_pos]); $_init_mce = 1 if ($_prev_w->{$_pid}[$_pos] ne $_wrks[$_pos]); $_prev_c->{$_pid}[$_pos] = $_code[$_pos]; $_prev_m->{$_pid}[$_pos] = $_mode[$_pos]; $_prev_n->{$_pid}[$_pos] = $_name[$_pos]; $_prev_w->{$_pid}[$_pos] = $_wrks[$_pos]; shift; $_pos++; } if (defined $_prev_c->{$_pid}[$_pos]) { pop @{ $_prev_c->{$_pid} } for ($_pos .. $#{ $_prev_c->{$_pid } }); pop @{ $_prev_m->{$_pid} } for ($_pos .. $#{ $_prev_m->{$_pid } }); pop @{ $_prev_n->{$_pid} } for ($_pos .. $#{ $_prev_n->{$_pid } }); pop @{ $_prev_w->{$_pid} } for ($_pos .. $#{ $_prev_w->{$_pid } }); $_init_mce = 1; } return unless (scalar @_code); ## ------------------------------------------------------------------------- my $_input_data; my $_max_workers = $_def->{$_pkg}{MAX_WORKERS}; my $_r = ref $_[0]; if (@_ == 1 && $_r =~ /^(?:ARRAY|HASH|SCALAR|GLOB|FileHandle|IO::)/) { _croak("$_tag: (HASH) not allowed as input by this MCE model") if $_r eq 'HASH'; $_input_data = shift; } if (defined (my $_p = $_params->{$_pid})) { $_max_workers = MCE::_parse_max_workers($_p->{max_workers}) if (exists $_p->{max_workers} && ref $_p->{max_workers} ne 'ARRAY'); delete $_p->{sequence} if (defined $_input_data || scalar @_); delete $_p->{user_func} if (exists $_p->{user_func}); delete $_p->{user_tasks} if (exists $_p->{user_tasks}); delete $_p->{use_slurpio} if (exists $_p->{use_slurpio}); delete $_p->{bounds_only} if (exists $_p->{bounds_only}); delete $_p->{gather} if (exists $_p->{gather}); } if (@_code > 1 && $_max_workers > 1) { $_max_workers = int($_max_workers / @_code + 0.5) + 1; } my $_chunk_size = do { my $_p = $_params->{$_pid} || {}; (defined $_p->{init_relay} || defined $_def->{$_pkg}{INIT_RELAY}) ? 1 : MCE::_parse_chunk_size( $_def->{$_pkg}{CHUNK_SIZE}, $_max_workers, $_params->{$_pid}, $_input_data, scalar @_ ); }; if (defined (my $_p = $_params->{$_pid})) { if (exists $_p->{_file}) { $_input_data = delete $_p->{_file}; } else { $_input_data = $_p->{input_data} if exists $_p->{input_data}; } } ## ------------------------------------------------------------------------- MCE::_save_state($_MCE->{$_pid}); if ($_init_mce || !exists $_queue->{$_pid}) { $_MCE->{$_pid}->shutdown() if (defined $_MCE->{$_pid}); $_queue->{$_pid} = [] if (!defined $_queue->{$_pid}); my $_Q = $_queue->{$_pid}; pop(@{ $_Q })->DESTROY for (@_code .. @{ $_Q }); push @{ $_Q }, MCE::Queue->new() for (@{ $_Q } .. @_code - 2); ## must clear arrays for nested session to work with Perl < v5.14 _gen_user_tasks($_pid, $_Q, [@_code], [@_mode], [@_name], [@_wrks]); @_code = @_mode = @_name = @_wrks = (); my %_opts = ( max_workers => $_max_workers, task_name => $_tag, user_tasks => $_user_tasks->{$_pid}, task_end => \&_task_end, use_slurpio => 0, ); if (defined (my $_p = $_params->{$_pid})) { local $_; for (keys %{ $_p }) { next if ($_ eq 'sequence_run'); next if ($_ eq 'max_workers' && ref $_p->{max_workers} eq 'ARRAY'); next if ($_ eq 'task_name' && ref $_p->{task_name} eq 'ARRAY'); next if ($_ eq 'input_data'); next if ($_ eq 'chunk_size'); next if ($_ eq 'task_end'); _croak("$_tag: ($_) is not a valid constructor argument") unless (exists $MCE::_valid_fields_new{$_}); $_opts{$_} = $_p->{$_}; } } for my $_k (qw/ tmp_dir freeze thaw init_relay use_threads /) { $_opts{$_k} = $_def->{$_pkg}{uc($_k)} if (exists $_def->{$_pkg}{uc($_k)} && !exists $_opts{$_k}); } $_MCE->{$_pid} = MCE->new(pkg => $_pkg, %_opts); } else { ## Workers may persist after running. Thus, updating the MCE instance. ## These options do not require respawning. if (defined (my $_p = $_params->{$_pid})) { for my $_k (qw( RS interval stderr_file stdout_file user_error user_output job_delay submit_delay on_post_exit on_post_run user_args flush_file flush_stderr flush_stdout max_retries )) { $_MCE->{$_pid}{$_k} = $_p->{$_k} if (exists $_p->{$_k}); } } } ## ------------------------------------------------------------------------- if (defined $_input_data) { @_ = (); $_MCE->{$_pid}->process({ chunk_size => $_chunk_size }, $_input_data); delete $_MCE->{$_pid}{input_data}; } elsif (scalar @_) { $_MCE->{$_pid}->process({ chunk_size => $_chunk_size }, \@_); delete $_MCE->{$_pid}{input_data}; } else { if (defined $_params->{$_pid} && exists $_params->{$_pid}{sequence}) { $_MCE->{$_pid}->run({ chunk_size => $_chunk_size, sequence => $_params->{$_pid}{sequence} }, 0); if (exists $_params->{$_pid}{sequence_run}) { delete $_params->{$_pid}{sequence_run}; delete $_params->{$_pid}{sequence}; } delete $_MCE->{$_pid}{sequence}; } } MCE::_restore_state(); # destroy queue(s) if MCE::run requested workers to shutdown if (!$_MCE->{$_pid}{_spawned}) { $_->DESTROY() for @{ $_queue->{$_pid} }; delete $_queue->{$_pid}; } return map { @{ $_ } } delete @_tmp{ 1 .. $_order_id - 1 } unless (defined $_aref); $_gather_ref = undef; return; } ############################################################################### ## ---------------------------------------------------------------------------- ## Private methods. ## ############################################################################### sub _croak { goto &MCE::_croak; } sub _gen_user_tasks { my ($_pid, $_queue_ref, $_code_ref, $_mode_ref, $_name_ref, $_wrks_ref) = @_; @{ $_user_tasks->{$_pid} } = (); ## For the code block farthest to the right. push @{ $_user_tasks->{$_pid} }, { task_name => $_name_ref->[-1], max_workers => $_wrks_ref->[-1], gather => (@{ $_code_ref } > 1) ? $_queue_ref->[-1] : \&_preserve_order, user_func => sub { my ($_mce, $_chunk_ref, $_chunk_id) = @_; my @_a; my $_code = $_code_ref->[-1]; if (ref $_chunk_ref) { push @_a, ($_mode_ref->[-1] eq 'map') ? map { &{ $_code } } @{ $_chunk_ref } : grep { &{ $_code } } @{ $_chunk_ref }; } else { push @_a, ($_mode_ref->[-1] eq 'map') ? map { &{ $_code } } $_chunk_ref : grep { &{ $_code } } $_chunk_ref; } MCE->gather( (@{ $_code_ref } > 1) ? MCE->freeze([ \@_a, $_chunk_id ]) : (\@_a, $_chunk_id) ); } }; ## For in-between code blocks (processed from right to left). for (my $_i = @{ $_code_ref } - 2; $_i > 0; $_i--) { my $_pos = $_i; push @{ $_user_tasks->{$_pid} }, { task_name => $_name_ref->[$_pos], max_workers => $_wrks_ref->[$_pos], gather => $_queue_ref->[$_pos - 1], user_func => sub { my $_q = $_queue_ref->[$_pos]; while (1) { my $_chunk = $_q->dequeue; last unless (defined $_chunk); my @_a; my $_code = $_code_ref->[$_pos]; $_chunk = MCE->thaw($_chunk); push @_a, ($_mode_ref->[$_pos] eq 'map') ? map { &{ $_code } } @{ $_chunk->[0] } : grep { &{ $_code } } @{ $_chunk->[0] }; MCE->gather(MCE->freeze([ \@_a, $_chunk->[1] ])); } return; } }; } ## For the left-most code block. if (@{ $_code_ref } > 1) { push @{ $_user_tasks->{$_pid} }, { task_name => $_name_ref->[0], max_workers => $_wrks_ref->[0], gather => \&_preserve_order, user_func => sub { my $_q = $_queue_ref->[0]; while (1) { my $_chunk = $_q->dequeue; last unless (defined $_chunk); my @_a; my $_code = $_code_ref->[0]; $_chunk = MCE->thaw($_chunk); push @_a, ($_mode_ref->[0] eq 'map') ? map { &{ $_code } } @{ $_chunk->[0] } : grep { &{ $_code } } @{ $_chunk->[0] }; MCE->gather(\@_a, $_chunk->[1]); } return; } }; } return; } 1; __END__ ############################################################################### ## ---------------------------------------------------------------------------- ## Module usage. ## ############################################################################### =head1 NAME MCE::Stream - Parallel stream model for chaining multiple maps and greps =head1 VERSION This document describes MCE::Stream version 1.889 =head1 SYNOPSIS ## Exports mce_stream, mce_stream_f, mce_stream_s use MCE::Stream; my (@m1, @m2, @m3); ## Default mode is map and processed from right-to-left @m1 = mce_stream sub { $_ * 3 }, sub { $_ * 2 }, 1..10000; mce_stream \@m2, sub { $_ * 3 }, sub { $_ * 2 }, 1..10000; ## Native Perl @m3 = map { $_ * $_ } grep { $_ % 5 == 0 } 1..10000; ## Streaming grep and map in parallel mce_stream \@m3, { mode => 'map', code => sub { $_ * $_ } }, { mode => 'grep', code => sub { $_ % 5 == 0 } }, 1..10000; ## Array or array_ref my @a = mce_stream sub { $_ * $_ }, 1..10000; my @b = mce_stream sub { $_ * $_ }, \@list; ## Important; pass an array_ref for deeply input data my @c = mce_stream sub { $_->[1] *= 2; $_ }, [ [ 0, 1 ], [ 0, 2 ], ... ]; my @d = mce_stream sub { $_->[1] *= 2; $_ }, \@deeply_list; ## File path, glob ref, IO::All::{ File, Pipe, STDIO } obj, or scalar ref ## Workers read directly and not involve the manager process my @e = mce_stream_f sub { chomp; $_ }, "/path/to/file"; # efficient ## Involves the manager process, therefore slower my @f = mce_stream_f sub { chomp; $_ }, $file_handle; my @g = mce_stream_f sub { chomp; $_ }, $io; my @h = mce_stream_f sub { chomp; $_ }, \$scalar; ## Sequence of numbers (begin, end [, step, format]) my @i = mce_stream_s sub { $_ * $_ }, 1, 10000, 5; my @j = mce_stream_s sub { $_ * $_ }, [ 1, 10000, 5 ]; my @k = mce_stream_s sub { $_ * $_ }, { begin => 1, end => 10000, step => 5, format => undef }; =head1 DESCRIPTION This module allows one to stream multiple map and/or grep operations in parallel. Code blocks run simultaneously from right-to-left. The results are appended immediately when providing a reference to an array. ## Appends are serialized, even out-of-order ok, but immediately. ## Out-of-order chunks are held temporarily until ordered chunks ## arrive. mce_stream \@a, sub { $_ }, sub { $_ }, sub { $_ }, 1..10000; ## input ## chunk1 input ## chunk3 chunk2 input ## chunk2 chunk2 chunk3 input ## append1 chunk3 chunk1 chunk4 input ## append2 chunk1 chunk5 chunk5 input ## append3 chunk5 chunk4 chunk6 ... ## append4 chunk4 chunk6 ... ## append5 chunk6 ... ## append6 ... ## ... ## MCE incurs a small overhead due to passing of data. A fast code block will run faster natively when chaining multiple map functions. However, the overhead will likely diminish as the complexity increases for the code. ## 0.334 secs -- baseline using the native map function my @m1 = map { $_ * 4 } map { $_ * 3 } map { $_ * 2 } 1..1000000; ## 0.427 secs -- this is quite amazing considering data passing my @m2 = mce_stream sub { $_ * 4 }, sub { $_ * 3 }, sub { $_ * 2 }, 1..1000000; ## 0.355 secs -- appends to @m3 immediately, not after running my @m3; mce_stream \@m3, sub { $_ * 4 }, sub { $_ * 3 }, sub { $_ * 2 }, 1..1000000; Even faster is mce_stream_s; useful when input data is a range of numbers. Workers generate sequences mathematically among themselves without any interaction from the manager process. Two arguments are required for mce_stream_s (begin, end). Step defaults to 1 if begin is smaller than end, otherwise -1. ## 0.278 secs -- numbers are generated mathematically via sequence my @m4; mce_stream_s \@m4, sub { $_ * 4 }, sub { $_ * 3 }, sub { $_ * 2 }, 1, 1000000; =head1 OVERRIDING DEFAULTS The following list options which may be overridden when loading the module. The fast option is obsolete in 1.867 onwards; ignored if specified. use Sereal qw( encode_sereal decode_sereal ); use CBOR::XS qw( encode_cbor decode_cbor ); use JSON::XS qw( encode_json decode_json ); use MCE::Stream max_workers => 8, # Default 'auto' chunk_size => 500, # Default 'auto' tmp_dir => "/path/to/app/tmp", # $MCE::Signal::tmp_dir freeze => \&encode_sereal, # \&Storable::freeze thaw => \&decode_sereal, # \&Storable::thaw init_relay => 0, # Default undef; MCE 1.882+ use_threads => 0, # Default undef; MCE 1.882+ default_mode => 'grep', # Default 'map' ; From MCE 1.8 onwards, Sereal 3.015+ is loaded automatically if available. Specify C<< Sereal => 0 >> to use Storable instead. use MCE::Stream Sereal => 0; =head1 CUSTOMIZING MCE =over 3 =item MCE::Stream->init ( options ) =item MCE::Stream::init { options } =back The init function accepts a hash of MCE options. The gather and bounds_only options, if specified, are ignored due to being used internally by the module (not shown below). use MCE::Stream; MCE::Stream->init( chunk_size => 1, max_workers => 4, user_begin => sub { print "## ", MCE->wid, " started\n"; }, user_end => sub { print "## ", MCE->wid, " completed\n"; } ); my @a = mce_stream sub { $_ * $_ }, 1..100; print "\n", "@a", "\n"; -- Output ## 1 started ## 2 started ## 3 started ## 4 started ## 3 completed ## 1 completed ## 2 completed ## 4 completed 1 4 9 16 25 36 49 64 81 100 121 144 169 196 225 256 289 324 361 400 441 484 529 576 625 676 729 784 841 900 961 1024 1089 1156 1225 1296 1369 1444 1521 1600 1681 1764 1849 1936 2025 2116 2209 2304 2401 2500 2601 2704 2809 2916 3025 3136 3249 3364 3481 3600 3721 3844 3969 4096 4225 4356 4489 4624 4761 4900 5041 5184 5329 5476 5625 5776 5929 6084 6241 6400 6561 6724 6889 7056 7225 7396 7569 7744 7921 8100 8281 8464 8649 8836 9025 9216 9409 9604 9801 10000 Like with MCE::Stream->init above, MCE options may be specified using an anonymous hash for the first argument. Notice how both max_workers and task_name can take an anonymous array for setting values uniquely per each code block. Remember that MCE::Stream processes from right-to-left when setting the individual values. use MCE::Stream; my @a = mce_stream { task_name => [ 'c', 'b', 'a' ], max_workers => [ 2, 4, 3, ], user_end => sub { my ($mce, $task_id, $task_name) = @_; print "$task_id - $task_name completed\n"; }, task_end => sub { my ($mce, $task_id, $task_name) = @_; MCE->print("$task_id - $task_name ended\n"); } }, sub { $_ * 4 }, ## 2 workers, named c sub { $_ * 3 }, ## 4 workers, named b sub { $_ * 2 }, 1..10000; ## 3 workers, named a -- Output 0 - a completed 0 - a completed 0 - a completed 0 - a ended 1 - b completed 1 - b completed 1 - b completed 1 - b completed 1 - b ended 2 - c completed 2 - c completed 2 - c ended Note that the anonymous hash, for specifying options, also comes first when passing an array reference. my @a; mce_stream { ... }, \@a, sub { ... }, sub { ... }, 1..10000; =head1 API DOCUMENTATION Scripts using MCE::Stream can be written using the long or short form. The long form becomes relevant when mixing modes. Again, processing occurs from right-to-left. my @m3 = mce_stream { mode => 'map', code => sub { $_ * $_ } }, { mode => 'grep', code => sub { $_ % 5 == 0 } }, 1..10000; my @m4; mce_stream \@m4, { mode => 'map', code => sub { $_ * $_ } }, { mode => 'grep', code => sub { $_ % 5 == 0 } }, 1..10000; For multiple grep blocks, the short form can be used. Simply specify the default mode for the module. The two valid values for default_mode is 'grep' and 'map'. use MCE::Stream default_mode => 'grep'; my @f = mce_stream_f sub { /ending$/ }, sub { /^starting/ }, $file; The following assumes 'map' for default_mode in order to demonstrate all the possibilities for providing input data. =over 3 =item MCE::Stream->run ( sub { code }, list ) =item mce_stream sub { code }, list =back Input data may be defined using a list or an array reference. Unlike MCE::Loop, Flow, and Step, specifying a hash reference as input data isn't allowed. ## Array or array_ref my @a = mce_stream sub { $_ * 2 }, 1..1000; my @b = mce_stream sub { $_ * 2 }, \@list; ## Important; pass an array_ref for deeply input data my @c = mce_stream sub { $_->[1] *= 2; $_ }, [ [ 0, 1 ], [ 0, 2 ], ... ]; my @d = mce_stream sub { $_->[1] *= 2; $_ }, \@deeply_list; ## Not supported my @z = mce_stream sub { ... }, \%hash; =over 3 =item MCE::Stream->run_file ( sub { code }, file ) =item mce_stream_f sub { code }, file =back The fastest of these is the /path/to/file. Workers communicate the next offset position among themselves with zero interaction by the manager process. C { File, Pipe, STDIO } is supported since MCE 1.845. my @c = mce_stream_f sub { chomp; $_ . "\r\n" }, "/path/to/file"; # faster my @d = mce_stream_f sub { chomp; $_ . "\r\n" }, $file_handle; my @e = mce_stream_f sub { chomp; $_ . "\r\n" }, $io; # IO::All my @f = mce_stream_f sub { chomp; $_ . "\r\n" }, \$scalar; =over 3 =item MCE::Stream->run_seq ( sub { code }, $beg, $end [, $step, $fmt ] ) =item mce_stream_s sub { code }, $beg, $end [, $step, $fmt ] =back Sequence may be defined as a list, an array reference, or a hash reference. The functions require both begin and end values to run. Step and format are optional. The format is passed to sprintf (% may be omitted below). my ($beg, $end, $step, $fmt) = (10, 20, 0.1, "%4.1f"); my @f = mce_stream_s sub { $_ }, $beg, $end, $step, $fmt; my @g = mce_stream_s sub { $_ }, [ $beg, $end, $step, $fmt ]; my @h = mce_stream_s sub { $_ }, { begin => $beg, end => $end, step => $step, format => $fmt }; =over 3 =item MCE::Stream->run ( { input_data => iterator }, sub { code } ) =item mce_stream { input_data => iterator }, sub { code } =back An iterator reference may be specified for input_data. The only other way is to specify input_data via MCE::Stream->init. This prevents MCE::Stream from configuring the iterator reference as another user task which will not work. Iterators are described under section "SYNTAX for INPUT_DATA" at L. MCE::Stream->init( input_data => iterator ); my @a = mce_stream sub { $_ * 3 }, sub { $_ * 2 }; =head1 MANUAL SHUTDOWN =over 3 =item MCE::Stream->finish =item MCE::Stream::finish =back Workers remain persistent as much as possible after running. Shutdown occurs automatically when the script terminates. Call finish when workers are no longer needed. use MCE::Stream; MCE::Stream->init( chunk_size => 20, max_workers => 'auto' ); my @a = mce_stream { ... } 1..100; MCE::Stream->finish; =head1 INDEX L, L =head1 AUTHOR Mario E. Roy, Smarioeroy AT gmail DOT comE> =cut