Re: bdflush flushing memory mapped pages.

[Nick Piggin]

Keith Ansell wrote:

>Thank you for your prompt replies.
>
>I realise that Linux conforms to the letter of the specification, but maybe
>not the spirit of the it.
>
>I am porting a Database solution to Linux from Unix SVR4, Sco OpenServer and
>AIX, where all write required memory mapped files are flushed to disk with
>the system flusher, my users have large systems (some in excess of 600
>concurrent connections) flushing memory mapped files is a big part of are
>systems performance.  This ensures that in the event of a catastrophic
>system failure the customers vitual business data has been written to disk .
>
As Andrew mentioned, msync would do what you want. It seems
to me though, that your database solution wants a stronger
guarantee about the safety of the data than asynchronous
writes will provide anyway.