[Twisted-Python] non-blocking interface for local file system operations

[Eduardo Schettino]

Hi Henrik,

  Thanks for the information. It was really helpful. I was thinking
that my IO operations would be an issue. I will take your suggestion
and do IO directly by now.

Regards,
  Eduardo

On 8/9/07, Henrik Thostrup Jensen <thostrup at gmail.com> wrote:
> Hi
>
> On 8/9/07, Eduardo Schettino <schettino72 at gmail.com> wrote:
>
> >
> > Is there an asynchronous wrapper for local file system operation
> > (i.e. write a file to disk)?
>
> I don't think there is anything that works out of the box. I think there is
> a python wrapper for posix aio somewhere, but AFAIK it is not integrated
> into twisted in any way.
> > And I guess using deferToThread is not the right approach for I/O
> operations.
> >
>
> Usually writes take _very_ little time. The data is only copied to kernel
> space and control is returned. The data is then written to disk later.
> Reading will probably be a bit more problematic, but it will still take
> little time compared to (common) network IO.
>
> I suggest starting with just doing writes and reads directly and if it
> becomes a problem, then start to solve it. You can create a small file
> wrapper which returns a defer (just use return defer.succeed() and then
> change the implementation if it becomes necessary.
>
> --
>    - Henrik
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