Re: pgsql: Have test_fsync honor -f filename argument.

Qingqing Zhou wrote:
>
> "Bruce Momjian" <momjian@svr1.postgresql.org> wrote
> > -----------
> > Have test_fsync honor -f filename argument.
> >
>
> The patch may forget to change the error message (Also, it would be better
> to append a '\n' in die() function). Another possible problem of this test
> is that it pickups the "/var/tmp". OS may have IO optimization on temporary
> directories, which will affect the confidence of the results.
>
> Example:
> ---
> $#./test_fsync -f $HOME/test.out
> Simple write timing:
>         write                    4.265149
> $#./test_fsync -f /var/tmp/test.out
> Simple write timing:
>         write                    0.018404
> $#./test_fsync -f /tmp/test.out
> Simple write timing:
>         write                    0.018511
> ---

Thanks.  Updated error message and added mention of memory file systems
to README.

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