Class: Procview::Analyzer

Inherits:
Object
  • Object
show all
Defined in:
lib/procview/analyzer.rb

Defined Under Namespace

Classes: PSTATS

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(opts = { debug: nil, missing: true }) ⇒ Analyzer

Returns a new instance of Analyzer.



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# File 'lib/procview/analyzer.rb', line 46

def initialize opts = { debug: nil, missing: true }
  @calls  = Hash.new {|h,k| h[k] = [0,0.0]}
  @iomap  = Hash.new{|h,k| h[k] = Procview::Stats.new}
  @pstats = Hash.new{|h,k| h[k] = initPstats }
  @ipid   = nil # the initial pid
  @pid    = nil # the current pid (same as above if just one process)
  @sigmap = Hash.new(0)
  @dregs  = 0.0 # store unaccounted for time here
  @pwd    = nil
  @inithandles = nil
  @opts   = opts
  @info   = []
  @warnings = []
end

Instance Attribute Details

#calls ⇒ Object (readonly)

Returns the value of attribute calls.



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# File 'lib/procview/analyzer.rb', line 13

def calls
  @calls
end

#dregs ⇒ Object (readonly)

Returns the value of attribute dregs.



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# File 'lib/procview/analyzer.rb', line 13

def dregs
  @dregs
end

#info(msg) ⇒ Object (readonly)

Returns the value of attribute info.



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# File 'lib/procview/analyzer.rb', line 13

def info
  @info
end

#inithandles=(value) ⇒ Object (writeonly)

Sets the attribute inithandles

Parameters:

  • value —

    the value to set the attribute inithandles to.



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# File 'lib/procview/analyzer.rb', line 14

def inithandles=(value)
  @inithandles = value
end

#iomap ⇒ Object (readonly)

Returns the value of attribute iomap.



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# File 'lib/procview/analyzer.rb', line 13

def iomap
  @iomap
end

#ipid ⇒ Object (readonly)

Returns the value of attribute ipid.



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# File 'lib/procview/analyzer.rb', line 13

def ipid
  @ipid
end

#pstats ⇒ Object (readonly)

Returns the value of attribute pstats.



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# File 'lib/procview/analyzer.rb', line 13

def pstats
  @pstats
end

#pwd ⇒ Object

Returns the value of attribute pwd.



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# File 'lib/procview/analyzer.rb', line 15

def pwd
  @pwd
end

#sigmap ⇒ Object (readonly)

Returns the value of attribute sigmap.



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# File 'lib/procview/analyzer.rb', line 13

def sigmap
  @sigmap
end

#warnings ⇒ Object (readonly)

Returns the value of attribute warnings.



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# File 'lib/procview/analyzer.rb', line 13

def warnings
  @warnings
end

Instance Method Details

#digest(line) ⇒ Object 



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# File 'lib/procview/analyzer.rb', line 72

def digest line

  # Complex as we cope with traces with no pids
  # and traces where the initial LSOF lines don't
  # know the pid (debug output on a command trace)
  #
  if line.slice! /^(\d+)\s+/
    @pid = $1.to_i
    if @ipid == -1
      @pstats[@pid] = @pstats.delete(@ipid)
      @ipid = @pid
    end
  else
    @pid = @ipid
  end

  case line
  when /^TIME\s+/
    info "TRACED on #{$'}"

  when /^REQUEST\s+/
    info $'

  when /^LSOF/
    fields = line.split /\s+/
    unless fields.size > 9
      warning "Too few fields"
      return 1
    end
    pid = fields[2].to_i
    fname = fields[9..-1].join(' ')
    case fields[4]
    when 'cwd'
      raise "PID set prior to cwd" if @ipid
      @ipid = pid
      @pstats[@ipid].cwd = fname
    when /(\d+)\w/
      handle = $1.to_i
      @pstats[@ipid].hmap[handle] = fname
    else
      warning "Invalid handle #{fields[4]}"
      return 1
    end

  when / <unfinished ...>/
    @pstats[@pid].resume.push $`

  when /<... (\w+) resumed> /
    call = $1.to_sym
    rest = $'.chomp
    prev = @pstats[@pid].resume.find_index {|f| f =~ /^#{call}/}
    unless prev
      warning "Failed to find resumable call #{call}"
      return 1
    end
    first = @pstats[@pid].resume.delete_at(prev)
    return digest (@pid.to_s+" "+first+rest)

  when /^(?<call>\w+)\((?<args>.*)\)\s+=\s+\?/x # process termination has ?
    return 0

  when /^(?<call>\w+)
    \((?<args>.*)\)\s+=\s+(?<rc>-?(\d+|\?))\s*
      (?<ret>.*)\s+
      <(?<duration>.*)>$
    /x
    return handleCall($1.to_sym, $2, $3.to_i, $4, $5.to_f)

  when /^---\s*(\w+)\s*/
    signal = $1.to_sym
    @sigmap[signal] += 1
  when /^+++.*+++$/
  else
    warning "Unknown line format"
    return 1
  end
  return 0
end

#handleCall(call, args, rc, ret, duration) ⇒ Object 



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# File 'lib/procview/analyzer.rb', line 181

def handleCall call, args, rc, ret, duration
  pstat = @pstats[@pid]
  case call

  when :accept, :accept4 
    fd = StraceArgs.fd! args
    accumulate pstat.hmap, fd, :other, duration
    pstat.hmap[rc] = (StraceArgs.sockaddr!(args) || "#{call}#{rc}") if rc > 0

  when :clone
    StraceArgs.nextcomma! args
    flags = StraceArgs.flags! args
    @pstats[rc] = initPstats @pstats[@pid], flags.include?(:CLONE_FS), flags.include?(:CLONE_FILES)
    @dregs += duration

  when :stat, :lstat
    file = StraceArgs.name! args
    if rc == -1
      if @opts[:missing]
        @dregs += duration
      else
        @iomap[File.absolute_path(file, pstat.cwd)].acc! :other, duration
      end
    else
      @iomap[File.absolute_path(file, pstat.cwd)].acc! :other, duration
    end

  when :rename, :symlink
    f1 = StraceArgs.name! args
    f2 = StraceArgs.name! args
    @iomap[File.absolute_path(f1, pstat.cwd)].acc! :other, duration/2.0
    @iomap[File.absolute_path(f2, pstat.cwd)].acc! :other, duration/2.0

  when :execve, :access, :readlink, :chmod
    file = StraceArgs.name! args
    @iomap[File.absolute_path(file, pstat.cwd)].acc! :other, duration

  when :open
    file = StraceArgs.name! args
    if rc == -1
      if @opts[:missing]
        @dregs += duration
      else
        @iomap[File.absolute_path(file, pstat.cwd)].acc! :other, duration
      end
    else
      pstat.hmap[rc] = File.absolute_path(file, pstat.cwd)
      accumulate pstat.hmap, rc, :other, duration
    end

  when :mkdir, :rmdir, :getcwd, :statfs, :utimes, :unlink
    file = StraceArgs.name! args
    @iomap[File.absolute_path(file, pstat.cwd)].acc! :other, duration

  when :chdir
    file = StraceArgs.name! args
    pstat.cwd = File.absolute_path(file, pstat.cwd)
    @iomap[pstat.cwd].acc! :other, duration

  when :close
    fd = StraceArgs.fd! args
    inhmap = pstat.hmap.include? fd
    if rc == -1
      @dregs += duration
      raise "Handle map contains non-existent fd #{fd}" if inhmap
    end
    if inhmap
      accumulate pstat.hmap, fd, :other, duration
      pstat.hmap.delete fd
    end
    # Strace IO flags don't collect epoll_create so check assumption it's emap
    unless rc == -1 or inhmap or pstat.emap.include? fd
      warning "Neither handle map or emap include #{fd}"
    end

  when :fcntl
    fd = StraceArgs.fd! args
    op = StraceArgs.op! args
    if [:F_DUPFD, :F_DUPFD_CLOEXEC].include? op
      pstat.hmap[rc] = pstat.hmap[fd]
    end
    accumulate pstat.hmap, fd, :other, duration

  when :pipe, :pipe2
    fds = StraceArgs.afds! args
    pstat.hmap[fds[0]] = call
    accumulate pstat.hmap, fds[0], :other, duration/2.0
    pstat.hmap[fds[1]] = call
    accumulate pstat.hmap, fds[1], :other, duration/2.0

  when :eventfd, :eventfd2
    fd = StraceArgs.fd! args
    pstat.hmap[fd] = call
    accumulate pstat.hmap, fd, :other, duration

  when :socket
    pstat.hmap[rc] = Stats.new
    accumulate pstat.hmap, rc, :other, duration

  when :getsockopt, :setsockopt
    fd = StraceArgs.fd! args
    accumulate pstat.hmap, fd, :other, duration

  when :connect, :getpeername
    fd = StraceArgs.fd! args
    name = StraceArgs.sockaddr! args
    accumulate pstat.hmap, fd, :other, duration
    movetoIOmap name, fd, pstat.hmap

  when :bind
    fd = StraceArgs.fd! args
    name = StraceArgs.sockaddr! args
    accumulate pstat.hmap, fd, :other, duration
    movetoIOmap name, fd, pstat.hmap

  when :listen
    fd = StraceArgs.fd! args
    accumulate pstat.hmap, fd, :other, duration

  when :fsync, :fdatasync
    fd = StraceArgs.fd! args
    accumulate pstat.hmap, fd, :other, duration

  when :dup, :dup2, :dup3
    fd = StraceArgs.fd! args
    pstat.hmap[rc] = pstat.hmap[fd]
    accumulate pstat.hmap, fd, :other, duration

  when :flock, :fstat, :ioctl, :getsockname, :shutdown
    fd = StraceArgs.fd! args
    accumulate pstat.hmap, fd, :other, duration

  # Calls classed as 'wait'

  when :select
    max = StraceArgs.fd! args
    if max > 0
      rfds = StraceArgs.afds!(args).to_set
      wfds = StraceArgs.afds!(args).to_set
      efds = StraceArgs.afds!(args).to_set
      fds = rfds+wfds+efds
    else
      fds = Set.new
    end
    if fds.size > 0
      fds.each{|fd| accumulate pstat.hmap, fd, :wait, duration/fds.size}
    else
      @dregs += duration
    end

  when :poll, :ppoll
    fds = StraceArgs.pollfd! args
    if (rc > 0)
      rds = StraceArgs.pollfd! ret.slice(1..-2)
      rds.each{|rd| accumulate pstat.hmap, rd, :wait, duration/rds.size }
    else
      fds.each{|fd| accumulate pstat.hmap, fd, :wait, duration/fds.size }
    end

  when :epoll_ctl
    epfd = StraceArgs.fd! args
    op = StraceArgs.op! args
    fd  = StraceArgs.fd! args
    case op
    when :EPOLL_CTL_ADD, :EPOLL_CTL_MOD
      pstat.emap[epfd].add fd
    when :EPOLL_CTL_DEL
      pstat.emap[epfd].delete fd
    end

  when :epoll_wait, :epoll_pwait
    epfd = StraceArgs.fd! args
    if rc < 1
      pstat.emap[epfd].each do |fd|
        accumulate pstat.hmap, fd, :wait, duration/pstat.emap[epfd].size
      end
    else
      epfds = StraceArgs.epollevents! args
      epfds.each{|fd| accumulate pstat.hmap, fd, :wait, duration/epfds.size }
    end

  when :pread, :read, :recvfrom, :lseek, :recvmsg, :getdents
    fd = StraceArgs.fd! args
    accumulate pstat.hmap, fd, :read, duration

  when :truncate
    file = StraceArgs.name! args
    absfile = File.absolute_path(file, pstat.cwd)
    @iomap[absfile].acc! :write, duration

  when :pwrite, :write, :writev, :send, :sendmsg, :ftruncate
    fd = StraceArgs.fd! args
    accumulate pstat.hmap, fd, :write, duration

  when :sendto  # TODO the case when a sockaddr is specified
    fd = StraceArgs.fd! args
    accumulate pstat.hmap, fd, :write, duration

  when :arch_prctl, :wait4
    @dregs += duration

  else
    warn "Unhandled call #{call}"
    return 1
  end
  @calls[call][0] += 1
  @calls[call][1] += duration
  return 0
end

#initPstats(parent = nil, same_wd = false, same_fds = false) ⇒ Object 



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# File 'lib/procview/analyzer.rb', line 25

def initPstats parent = nil, same_wd = false, same_fds = false
  if parent
    cwd = same_wd ? parent.cwd : parent.cwd.clone
    hmap = same_fds ? parent.hmap : parent.hmap.clone
    emap = same_fds ? parent.emap : parent.emap.clone
    return PSTATS.new( cwd, hmap, emap, [] )
  else
    stats = PSTATS.new(
      @pwd,
      Hash.new do |h,k|
        warning "Unknown handle #{k} (Pid #{@pid})"
        h[k] = "h#{k}".to_sym
      end,
      Hash.new{|h,k| h[k] = Set.new},
      []
    )
    @inithandles.each {|k,v| stats.hmap[k] = v} if @inithandles
    return stats
  end
end

#load(io) ⇒ Object 



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# File 'lib/procview/analyzer.rb', line 61

def load io
  while line = io.gets
    @opts[:debug].puts line if @opts[:debug]
    begin
      warning line if digest(line) > 0
    rescue StandardError => e
      warning "#{e.message} (#{e.backtrace[0]}): #{line}"
    end
  end
end

#warning(msg) ⇒ Object 



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# File 'lib/procview/analyzer.rb', line 21

def warning msg
  @warnings.push ($. > 0 ? "#{$.}: ":'')+msg
end