On Thu, Jun 18, 2015 at 8:29 AM, Tiankun Hu <tiankun...@foxmail.com> wrote:
> Hi Tom, > Thanks your reply, I have another question, in function > "min_available_space" why buffer_size/2 is best ? > I'm not really sure. That's a question for Eric. What happens when you change it? How does it affect performance? Tom > 在 2015年06月16日 21:31, Tom Rondeau 写道: > > On Tue, Jun 16, 2015 at 8:57 AM, Tiankun Hu <tiankun...@foxmail.com> > wrote: > >> Hi, >> After go through the block_executor.cc, I found alignment feature work >> only when output_multiple not set, why them can not work at the same time? >> >> -- >> Thanks >> Tiankun >> > > Because they are competing objectives. The alignment tries to keep > buffers aligned and therefore the number of items will be based on a > multiple of the alignment requirement. If you need an output multiple > that's different than that, which one should the scheduler choose? > > Note that the buffers always begin on a page and so are inherently > aligned. If your output multiple is also a multiple of the alignment for > the data type, then you'll always be aligned. > > Tom > > > -- > Thanks > Tiankun > >
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