If you have only small integers and free memory, the fastest method (just  
one i/o) would be

  | memory fOut |
  memory := Bitmap new: 6 * 1000 * 1000.
  memory atAllPut: SmallInteger maxVal.
  [(fOut := StandardFileStream newFileNamed: 'f.out')
	nextPutAll: memory asByteArray]
   ensure: [fOut close]

You can fill the memory instance with #integerAt:put:

/Klaus

On Sat, 26 Jan 2008 16:57:16 +0100, André Wendt wrote:

> Lukas Renggli wrote:
>>> Oe possible optimization is to not use the #, message  because it
>>> create a copy of the String.
>>> So you can try:
>>>
>>> aFile := CrLfFileStream fileNamed: aFilename.
>>> aLargeCollection do: [ :int |
>>>   aFile nextPutAll: int printString; nextPut: Character cr.
>>> ].
>>> aFile close.
>>
>> Or even smarter:
>>
>>     aStream print: int; nextPut: Character cr
>>
>> Lukas
>
> Thanks for your suggestions! I've tried, but it didn't give the boost I
> was hoping for...
>
> André
>
>>> On Jan 26, 2008, at 12:37 PM, André Wendt wrote:
>>>
>>>> Hi,
>>>>
>>>> I'm looking for a fast way to write a large Collection of ints (over 6
>>>> million elements) to a file. My attempt was:
>>>>
>>>> aFile := CrLfFileStream fileNamed: aFilename.
>>>> aLargeCollection do: [ :int |
>>>>  aFile nextPutAll: int printString, String cr.
>>>> ].
>>>> aFile close.
>>>>
>>>> Unfortunately, this takes more than fifteen minutes. I suspect this is
>>>> due to my implementation.
>>>>
>>>> Is there any smart way I can do this faster?
>>>>
>>>> Thanks,
>>>> André
>>>>
>>>         Mth
>
>
>