Class: Pwrake::Master

Inherits:
Object
  • Object
show all
Defined in:
lib/pwrake/master/master.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Master

Returns a new instance of Master.



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# File 'lib/pwrake/master/master.rb', line 13

def initialize
  @selector = NBIO::Selector.new
  @hostinfo_by_taskname = {}
  @hdl_set = []
  @channel_by_hostid = {}
  @channels = []
  @hostinfo_by_id = {}
  @current_flow = {}
  # init
  @option = Option.new
  Log.set_logger(@option)
  TaskWrapper.init_task_logger(@option)
  # moved from Option#init
  @option.put_log
  if @option['LOG_DIR'] && @option['GC_LOG_FILE']
    GC::Profiler.enable
  end
end

Instance Attribute Details

#current_flow ⇒ Object (readonly)

current_flow = task.property.subflow



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# File 'lib/pwrake/master/master.rb', line 35

def current_flow
  @current_flow
end

#option ⇒ Object (readonly)

Returns the value of attribute option.



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# File 'lib/pwrake/master/master.rb', line 33

def option
  @option
end

#task_queue ⇒ Object (readonly)

Returns the value of attribute task_queue.



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# File 'lib/pwrake/master/master.rb', line 32

def task_queue
  @task_queue
end

#thread ⇒ Object (readonly)

Returns the value of attribute thread.



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# File 'lib/pwrake/master/master.rb', line 34

def thread
  @thread
end

Instance Method Details

#create_fiber(channels, &blk) ⇒ Object 



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# File 'lib/pwrake/master/master.rb', line 180

def create_fiber(channels,&blk)
  channels.each do |chan|
    fb = Fiber.new(&blk)
    fb.resume(chan)
  end
end

#drop_host(host_info) ⇒ Object 



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# File 'lib/pwrake/master/master.rb', line 405

def drop_host(host_info)
  Log.debug "drop_host: #{host_info.name}"
  hid = host_info.id
  if @hostinfo_by_id[hid]
    s = "drop:#{hid}"
    @channel_by_hostid[hid].put_line(s)
    @task_queue.drop_host(host_info)
    @hostinfo_by_id.delete(hid)
    if @hostinfo_by_id.empty?
      if @finished
        Log.debug "drop_host: @finished and @hostinfo_by_id.empty?"
      else
        Log.error "drop_host: All workers retired."
        $stderr.puts "All workers retired."
        @failed = true
      end
    end
  end
end

#ending? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pwrake/master/master.rb', line 376

def ending?
  #Log.debug " @no_more_run=#{@no_more_run.inspect}"
  #Log.debug " @task_queue.empty?=#{@task_queue.empty?}"
  #Log.debug " @hostinfo_by_id.empty?=#{@hostinfo_by_id.empty?}"
  #Log.debug " @hostinfo_by_taskname.keys=#{@hostinfo_by_taskname.keys.inspect}"
  (@no_more_run || @task_queue.empty? || @hostinfo_by_id.empty?) &&
    @hostinfo_by_taskname.empty?
end

#finish ⇒ Object 



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# File 'lib/pwrake/master/master.rb', line 425

def finish
  Log.debug "Master#finish begin"
  @branch_setup_thread.join
  # continues running fibers
  Log.debug "Master#finish @selector.run begin"
  @selector.run(60)
  Log.debug "Master#finish @selector.run end"
  if !@exited
    @exited = true
    Log.debug "Master#finish Handler.exit begin"
    NBIO::Handler.exit(@hdl_set)
    @selector.run(60)
    Log.debug "Master#finish Handler.exit end"
  end
  TaskWrapper.close_task_logger
  Log.debug "Master#finish end"
  @failed
end

#handle_failed_target(name) ⇒ Object 



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# File 'lib/pwrake/master/master.rb', line 385

def handle_failed_target(name)
  case @option['FAILED_TARGET']
    #
  when /rename/i, NilClass
    dst = name+"._fail_"
    ::FileUtils.mv(name,dst)
    msg = "Rename output file '#{name}' to '#{dst}'"
    $stderr.puts(msg)
    Log.warn(msg)
    #
  when /delete/i
    ::FileUtils.rm(name)
    msg = "Delete output file '#{name}'"
    $stderr.puts(msg)
    Log.warn(msg)
    #
  when /leave/i
  end
end

#invoke(t, args) ⇒ Object 



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# File 'lib/pwrake/master/master.rb', line 187

def invoke(t, args)
  Log.debug "Master#invoke start: #{t.class}[#{t.name}]"
  @failed = false
  t.pw_search_tasks(args)
  return if @running
  @running = true

  if @option['GRAPH_PARTITION']
    setup_postprocess0
    @task_queue.deq_noaction_task do |tw|
      tw.preprocess
      tw.status = "end"
      @post_pool.enq(tw)
    end
    @selector.run
    @post_pool.finish
    Log.debug "@post_pool.finish"

    require 'pwrake/misc/mcgp'
    MCGP.graph_partition(@option.host_map)
  end

  setup_postprocess1
  @branch_setup_thread.join
  @killed = 0
  [:TERM,:INT].each do |sig|
    Signal.trap(sig) do
      signal_trap(sig)
    end
  end
  send_task_to_idle_core
  setup_fiber(t)
end

#retire(hid) ⇒ Object 



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# File 'lib/pwrake/master/master.rb', line 166

def retire(hid)
  host_info = @hostinfo_by_id[hid.to_i]
  if host_info && host_info.decrease(1)
    # all retired
    m = "retired: host #{host_info.name}"
    Log.warn(m)
    $stderr.puts(m)
    drop_host(host_info) # delete from hostinfo_by_id
    if @hostinfo_by_id.empty?
      raise RuntimeError,"no worker host"
    end
  end
end

#send_task_to_idle_core ⇒ Object 



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# File 'lib/pwrake/master/master.rb', line 296

def send_task_to_idle_core
  #Log.debug "#{self.class}#send_task_to_idle_core start"
  count = 0
  # @idle_cores.decrease(..
  @task_queue.deq_task do |tw,host_info,ncore|
    host_info.busy(ncore)
    count += 1
    @hostinfo_by_taskname[tw.name] = host_info
    tw.preprocess
    if tw.has_action?
      hid = host_info.id
      s = "#{hid}:#{tw.task_id}:#{tw.name}"
      @channel_by_hostid[hid].put_line(s)
      tw.exec_host = host_info.name
      tw.exec_host_id = hid
    else
      tw.status = "end"
      task_end(tw,host_info) # @idle_cores.increase(..
      @post_pool.enq(tw)
    end
  end
  if count == 0 && !@task_queue.empty? && @hostinfo_by_taskname.empty?
    m="No task was invoked while unexecuted tasks remain"
    Log.error m
    Log.error "@task_queue="+@task_queue.inspect
    raise RuntimeError,m
  end
  #Log.debug "#{self.class}#send_task_to_idle_core end time=#{Time.now-tm}"
end

#setup_branch_handler(sub_host) ⇒ Object 



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# File 'lib/pwrake/master/master.rb', line 37

def setup_branch_handler(sub_host)
  ior,w0 = IO.pipe
  r2,iow = IO.pipe
  if sub_host == "localhost" && /^(n|f)/i !~ ENV['T']
    @thread = Thread.new(r2,w0,@option) do |r,w,o|
      Rake.application.run_branch_in_thread(r,w,o)
    end
  else
    dir = File.absolute_path(File.dirname($PROGRAM_NAME))
    cmd = "ssh -x -T -q #{sub_host} '" +
      "cd \"#{Dir.pwd}\";"+
      "PATH=#{dir}:${PATH} exec pwrake_branch'"
    Log.debug("BranchCommunicator cmd=#{cmd}")
    spawn(cmd,:pgroup=>true,:out=>w0,:in=>r2)
    w0.close
    r2.close
    Marshal.dump(@option,iow)
    iow.flush
    s = ior.gets
    if !s or s.chomp != "pwrake_branch start"
      raise RuntimeError,"pwrake_branch start failed: receive #{s.inspect}"
    end
  end
  rd = NBIO::Reader.new(@selector,ior)
  wt = NBIO::Writer.new(@selector,iow)
  return NBIO::Handler.new(rd,wt,sub_host)
end

#setup_branches ⇒ Object 



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# File 'lib/pwrake/master/master.rb', line 93

def setup_branches
  sum_ncore = 0
  @option.host_map.each do |sub_host, wk_hosts|
    @hdl_set << hdl = setup_branch_handler(sub_host)
    Fiber.new do
      hdl.put_line "host_list_begin"
      wk_hosts.each do |host_info|
        name = host_info.name
        ncore = host_info.ncore
        host_id = host_info.id
        Log.debug "connecting #{name} ncore=#{ncore} id=#{host_id}"
        hdl.put_line "host:#{host_id} #{name} #{ncore}"
        @channel_by_hostid[host_id] = hdl
        @hostinfo_by_id[host_id] = host_info
      end
      hdl.put_line "host_list_end"
      while s = hdl.get_line
        case s
        when /^ncore:done$/
          break
        when /^ncore:(\d+):(\d+)$/
          id, ncore = $1.to_i, $2.to_i
          Log.debug "worker_id=#{id} ncore=#{ncore}"
          @hostinfo_by_id[id].set_ncore(ncore)
          sum_ncore += ncore
        when /^ip:(\d+):(\S+)$/
          id, ipa = $1.to_i, $2
          Log.debug "worker_id=#{id} ip=#{ipa}"
          @hostinfo_by_id[id].set_ip(ipa)
        when /^exited$/
          raise RuntimeError,"Unexpected branch exit"
        else
          msg = "#{hdl.host}:#{s.inspect}"
          raise RuntimeError,"invalid return: #{msg}"
        end
      end
    end.resume
  end
  @selector.run

  Log.info "num_cores=#{sum_ncore}"
  @option.total_cores = sum_ncore
  @hostinfo_by_id.each do |id,host|
    if ncore = @hostinfo_by_id[id].idle_cores
      Log.info "#{host.name} id=#{id} ncore=#{ncore}"
    else
      @hostinfo_by_id.delete(id)
    end
  end
  if @hostinfo_by_id.empty?
    raise RuntimeError,"no worker host"
  end
  queue_class = Pwrake.const_get(@option.queue_class)
  @task_queue = queue_class.new(@hostinfo_by_id)

  @branch_setup_thread = Thread.new do
    create_fiber(@hdl_set) do |hdl|
      while s = hdl.get_line
        case s
        when /^retire:(\d+)$/
          retire($1.to_i)
        when /^branch_setup:done$/
          break
        else
          raise RuntimeError,"branch_setup failed: s=#{s.inspect}"
        end
      end
    end
    @selector.run
  end

end

#setup_fiber(t) ⇒ Object 



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# File 'lib/pwrake/master/master.rb', line 221

def setup_fiber(t)
  n_retry = @option["RETRY"]
  create_fiber(@hdl_set) do |hdl|
    while s = hdl.get_line
      Log.debug "Master:recv #{s.inspect} from branch[#{hdl.host}]"
      case s
      when /^task(\w+):(\d*):(.*)$/o
        status, shell_id, task_name = $1, $2.to_i, $3
        tw = Rake.application[task_name].wrapper
        tw.shell_id = shell_id
        tw.status = status
        host_info = @hostinfo_by_taskname[task_name]
        if host_info.nil?
          m = "unknown hostid: task_name=#{task_name} s=#{s.inspect}"+
            " @hostinfo_by_taskname.keys=#{@hostinfo_by_taskname.keys.inspect}"
          Log.error(m)
          $stderr.puts(m)
        end
        task_end(tw,host_info) # @idle_cores.increase(..
        # check failure
        if tw.status == "fail"
          $stderr.puts %[task "#{tw.name}" failed.]
          if host_info
            continuous_fail = host_info.task_result(tw.status)
            Log.debug "task=#{tw.name} continuous_fail=#{continuous_fail}"
            if continuous_fail > n_retry && @hostinfo_by_id.size > 1
              # retire this host
              drop_host(host_info)
              Log.warn("retired host:#{host_info.name} due to continuous fail")
            end
          end
          if tw.no_more_retry && !@failed
            @failed = true
            case @option['FAILURE_TERMINATION']
            when 'kill'
              NBIO::Handler.kill(@hdl_set,"INT")
              @selector.run
              @no_more_run = true
              $stderr.puts "... Kill running tasks."
            when 'continue'
              $stderr.puts "... Continue runable tasks."
            else # 'wait'
              @no_more_run = true
              $stderr.puts "... Wait for running tasks."
            end
          end
          if tw.has_output_file? && File.exist?(tw.name)
            handle_failed_target(tw.name)
          end
        end
        # postprocess
        @post_pool.enq(tw) # must be after @no_more_run = true
        break if @finished
      when /^retire:(\d+)$/
        retire($1.to_i)
      when /^exited$/o
        @exited = true
        Log.debug "receive #{s.chomp} from branch"
        break
      else
        Log.error "unknown result: #{s.inspect}"
        $stderr.puts(s)
      end
    end
    Log.debug "Master#invoke: fiber end"
  end
  if !ending?
    Log.debug "@selector.run begin"
    @selector.run
    Log.debug "@selector.run end"
  end
  @post_pool.finish
  Log.debug "Master#invoke: end of task=#{t.name}"
end

#setup_postprocess ⇒ Object 



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# File 'lib/pwrake/master/master.rb', line 326

def setup_postprocess
  i = 0
  n = @option.max_postprocess_pool
  @post_pool = FiberPool.new(n) do |pool|
    postproc = @option.postprocess(@selector)
    i += 1
    Log.debug "New postprocess fiber ##{i}"
    Fiber.new do
      j = i
      while tw = pool.deq()
        #Log.debug "postproc##{j} deq=#{tw.name}"
        tw.postprocess(postproc)
        pool.count_down
        @hostinfo_by_taskname.delete(tw.name)
        tw.retry_or_subsequent unless @exited
        break if yield(pool,j)
      end
      postproc.close
      #Log.debug "postproc##{j} end"
    end
  end
end

#setup_postprocess0 ⇒ Object 



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# File 'lib/pwrake/master/master.rb', line 357

def setup_postprocess0
  setup_postprocess{false}
end

#setup_postprocess1 ⇒ Object 



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# File 'lib/pwrake/master/master.rb', line 361

def setup_postprocess1
  setup_postprocess do |pool,j|
    #Log.debug " pool.empty?=#{pool.empty?}"
    if ending?
      Log.debug "postproc##{j} closing"
      @finished = true
      @selector.halt
      true
    elsif !@no_more_run
      send_task_to_idle_core
      false
    end
  end
end

#signal_trap(sig) ⇒ Object 



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# File 'lib/pwrake/master/master.rb', line 65

def signal_trap(sig)
  case @killed
  when 0
    # log writing failed. can't be called from trap context
    $stderr.puts "\nSignal trapped. (sig=#{sig} pid=#{Process.pid} ##{@killed})"
    if Rake.application.options.debug
      $stderr.puts "in master thread #{Thread.current}:"
      $stderr.puts caller
      if @thread
        $stderr.puts "in branch thread #{@thread}:"
        $stderr.puts @thread.backtrace.join("\n")
      end
    end
    $stderr.puts "Exiting..."
    @no_more_run = true
    @failed = true
    NBIO::Handler.kill(@hdl_set,sig)
    # @selector.run : not required here
  when 1
    $stderr.puts "\nOnce more Ctrl-C (SIGINT) for exit."
  when 2
    @thread.kill if @thread
  else
    Kernel.exit(false) # must wait for nomral exit
  end
  @killed += 1
end

#task_end(tw, host_info) ⇒ Object 



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# File 'lib/pwrake/master/master.rb', line 349

def task_end(tw,host_info)
  if host_info && host_info.idle(tw.n_used_cores(host_info))
    # all retired
    Log.warn("retired host:#{host_info.name} because all core retired")
    drop_host(host_info)
  end
end