Re: [HACKERS] fsynch of pg_log write..

Zeugswetter Andreas IZ5 wrote:
>
> Vadim wrote:
> > Right way is just set some flag in WriteBuffer()/WriteNoReleaseBuffer()
> > and don't do
> >
> > FlushBufferPool
> > TransactionIdCommit
> > FlushBufferPool
> >
> > at all when this flag is not setted.
> >
> While this is even much better for select only transactions
> it will still do the second flush for writers.
> This flush is not needed for those, that are only interested
> in consistency, and don't care if the last transaction before
> system/backend crash is lost.
> It can actually really only be the very last transaction reported
> ok to any client, that is rolled back, since all other xactions
> will be flushed by this same first FlushBufferPool
> (since BufferSync currently flushes all dirty Pages).
> So IMHO a switch to avoid the second FlushBufferPool
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> would still be useful, even with this suggested fix.

I didn't object this.

Vadim