[DUG] Creating lots of files on slow machines

[Steve Peacocke]

Hi John,

All I can say is that I came across this before and resolved it in much the
same way. I looked up the issue at the time and there was some convoluted
explanation but in the end I just put it down to the programmer (me) being
so fast that even a computer couldn't keep up. I could live with that
explanation.

This was about 10 years ago.

Steve

On Thursday, 12 April 2012, John Bird wrote:

>   I came across an oddity in a program that creates lots (eg 30,000+)
> files exporting selected data from a database.
>
> Some files disappear on slower PCs  even though they are created.
>
>    - Files are created in a thread using TFilestream, in a loop
>    - Each file is being checked that it gets created using a if
>    FileExists(filename) in the loop and they always seem to be there.
>    - Files are written at the rate of around 20-30 per second and are
>    mostly around 3KB in size.
>    - At the end of the big loop a list of files created is created by the
>    usual FindNext code.
>    - On some slower PC’s (XP or Server 2003) some files are missing.
>    Faster PC’s with Win7 have all the files.  All PC’s are VMs.
>    - Files missing might range from 10 to 500, never the same number
>    - The problem can be cured by putting a 2 millisecond sleep between
>    creating each file.  1 Millisecond is not enough.
>
> Can anyone shed any light on why this might be the underlying issue and
> why a sleep might fix it?
>
> John Bird
>


-- 

Steve Peacocke
Mobile: 0220 612-611
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Profile<http://nz.linkedin.com/pub/steve-peacocke/1/a06/489>
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