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Re: reading and writing very slow [message #75050 is a reply to message #75049]

Fri, 11 February 2011 07:16

oxfordenergyservices is currently offline

oxfordenergyservices
Messages: 56
Registered: January 2009

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On Feb 11, 2:09 pm, Reimar Bauer <R.Ba...@fz-juelich.de> wrote:
> Am 11.02.2011 14:12, schrieb geoff:
>
>> Hi
>
>> I have some 1-2 GB text files (lots of them!), each containing weather
>> data for many thousands of stations for 1 year (per file). I need to
>> get the data out of the year files and into files which have all the
>> data for 1 weather station. It's easy but slow.
>
>> I am reading each year file line by line and appending that line to
>> the filename of the station (which is one of the fields on the line).
>> (openw.../append, close). Does opening and closing files so many
>> times have such an overhead? Is there a quicker way?
>
> no
>
> but reading line by line has.
>
only way i know how. variable length ascii unfortunately :(

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[Message index]

		Re: reading and writing very slow By: R.Bauer on Mon, 14 February 2011 08:29
		Re: reading and writing very slow By: oxfordenergyservices on Fri, 11 February 2011 09:06
		Re: reading and writing very slow By: ben.bighair on Fri, 11 February 2011 07:27
		Re: reading and writing very slow By: oxfordenergyservices on Fri, 11 February 2011 07:16
		Re: reading and writing very slow By: R.Bauer on Fri, 11 February 2011 06:09

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