From: Zhukov Pavel <gelios@...>
Date: 2008-06-28T19:23:36+09:00
Subject: Re: Big empty file creation

On Sat, Jun 28, 2008 at 1:22 PM, Robert Klemme
<shortcutter@googlemail.com> wrote:
> On 28.06.2008 11:10, ts wrote:
>>
>> Zhukov Pavel wrote:
>>>
>>> I need to creat an empty file, over 10GB size.
>>> Which way is fastest in file creation?
>>
>> use IO#sysseek followed which a IO#seekwrite
>
> But note that this will not work on all OS in case the file must be
> allocated.  Seeking likely creates a sparse file.
>
> Another approach is to use dd like
>
> dd if=/dev/zero of=your_file bs=1048576 count=10240
>
> That's probably as fast as it gets if you need blocks actually allocated to
> the file.
>
> Kind regards
>
>        robert
>
>

i can't use dd, cause i want a cross-platform application