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Hello,

	Just to share an experience of something that happened to me today; i wrote a 
script and it took all the memory of my computer and I had no idea why...
	Then after many hours, I had a flash.. Maybe SyncEnumerator was guilty, since 
it (does it?) seems to use continuations...
	Well.. in my code I actually could change the use of SyncEnumerator by an 
Array#zip.. the result: the calculation took about no memory (instead of 
several hundred megabytes) and finished almost instantly (as it always should 
have)!

	So, maybe just a warning: SyncEnumerator is not as cheap as it seems: prefer 
Array#zip, and at the moment I can't think of a reason when SyncEnumerator 
brings something over Array#zip since Array#zip is so much faster...

	Attached a script.. it doesn't actually work to the end (the script is 
working on data that I can't send here), but you can see the difference if 
running with SyncEnumerator or Array#zip. Amazing!

	At line 12 in the script:
# 	s = SyncEnumerator.new(persons, values)
	s = persons.zip(values)

you can switch the comment between the two lines to see the change.

my conclusion for now: maybe SyncEnumerator will be one day more readable than 
Array#zip, but in current implementations of ruby, it's way too slow..

emmanuel
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									=09
									=09
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col3	aaaaaaaaa aaaaaa	aaaaaaaa aaaaaa	aaaaaaaaaaaa	=C5=A1aaaaaa-aaaaa aa =
=C5=A1aaa	=C5=A1aaaaaa-aaaaa aa =C5=A1aaa	aaaaaaaaa-aaaaa aa =C5=A1aaa	aaaa=
aaaaaa,aaaaaaa	aaaaaaa	aaaaaaaaaa	aaaa=C4=8Daaaa=C4=8Daa
col4	b	b	b	b	b	b	b	a	b	a
col5	4	4	3	3	4	5	3	3	4	3
	M	N	N	N	M	N	N	N	M	M
	438	439	440	441	442	443	444	445	446	447
	438	439	440	441	442	443	444	445	446	447
									=09
									=09
									=09
									=09
	448	449	450	451	452	453	454	455	456	457
col1	M	=C5=BD	M	M	M	M	M	=C5=BD	=C5=BD	M
col2	23	23	24	25	23	22	23	24	16	24
col3	=C5=A1aaaaaa	=C5=A1aaaaaa	aaaa aaaaaaa 	aaaaaa	aaaaaaaaaaaa	aaaa aaaaa=
aa	a.a.	=C5=A1aaaaaaaa	aaaaaaaaa	aaaaaaa
col4	a	b	brez poklica 	b	b	brez poklica	b.o.	b	iz b v a	b
col5	3	4	4	b.o.	3	2	4	5	4	4
	448	449	450	451	452	453	454	455	456	457
	M	M	M	N	S	S	E	N	N	N
	448	449	450	451	452	453	454	455	456	457
									=09
									=09
									=09
									=09
									=09
									=09
									=09
	458	459	460	461	462	463	464	465	466=09
col1	M	M	M	M	M	M	=C5=BD	M	M=09
col2	25	24	20	25	25	20	20	24	21=09
col3	=C5=A1aaaaaa	aaaaaa=C5=A1=C4=8Daaa	aaaa aaaaaaa	aaaaaaaa	aaaaaaa	aaaaa=
aa-aaaaaaa	aaaaaaaaa	aaaaaaaaaa	aaaaa=09
col4	a	a	a	b.o.	a	b	b	a	b=09
col5	4,5	3	3	4 do 5	3	3	4	4	3=09
	N	M	M	M	M	E	M	E	M=09
	458	459	460	461	462	463	464	465	466=09
	458	459	460	461	462	463	464	465	466=09

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require 'generator'

def usage(msg); puts msg; exit 1; end

def parse_line(persons, lines, member, col_name)
	while (line = lines.next.chomp) !~ /^#{Regexp.escape(col_name)}/
		#puts "#{line} doesn't match skipping it"
	end
	values = line.split /\t/
	values.shift # remove the column name
# 	s = SyncEnumerator.new(persons, values)
	s = persons.zip(values)
	s.each { |person, value|
		if person.send(member)
			# not overwriting if value is not nil
			next
		end
		_value = if block_given?; yield value; else value; end
		person.send(member.to_s + '=', _value)
	}
end

class Person
	attr_accessor :person_id, :is_male, :age, :job, :state,
		:education
	
	def initialize(person_id)
		@person_id = person_id
	end
end

if $0 == __FILE__
	
	fName = ARGV.shift || usage("missing filename of statistics file")
	f = File.open(fName)
	lines = Generator.new(f)
	
	all_persons = []
	
	while lines.next?
		
		line = lines.next.chomp while (lines.next? && line !~ /^(\t\d+)+\s*$/)
		break if line !~ /^(\t\d+)+\s*$/
		
		# found a series of data. first line => series
		# of person numbers
		person_ids = line.scan(/\d+/).map {|i| i.to_i}
		line = nil # clear for next iteration
		persons = person_ids.map { |p_id| Person.new(p_id) }
		
		# now the series of genders
		parse_line(persons, lines, :is_male, 'col1') { |gender_s| (gender_s == 'M') }
		# now the age
		parse_line(persons, lines, :age, 'col2') 
		# now the job
		parse_line(persons, lines, :job, 'col3') 
		# now the stanje
		parse_line(persons, lines, :state, 'col4')
		# now the education
		parse_line(persons, lines, :education, 'col5')
	
		all_persons.concat(persons)
		puts "parsed #{all_persons.size} people"
		File.open('/proc/meminfo') {|memi| puts memi.grep(/MemFree/)} if RUBY_PLATFORM =~ /linux/
	end
	
	f.close
	
	File.open('data.dta', 'w') do |file|
		Marshal.dump(all_persons, file)
	end
	
end

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