Re: Filling a hash view

On 4 March 2010 19:37, Marcin Krol <[email protected]> wrote:
> Hello everyone,
>
> I'm "testdriving" metakit 4 py now, and I have a little trouble with hashed
> view: when the number of keys in view starts exceeding 2000, filling up a
> hash view becomes extremely slow.

When a view has a lot of rows you can fix the performance issues using
a blocked view. This is another wrapper around the view but it keeps
the performance in check. I've no idea about python but in C++
   c4_View v = rFiles(view[nInode]);
   m_vFiles = v.Blocked().Ordered();

When defining the layout you add a _B[] around the view description.

The performance issue is that metakit is column oriented. So when you
add a new row it moves whole columns around. By breaking this into
blocks it restricts the size of the columns. I use this kind of view
to manage 200 000 rows per view quite handily.

Pat.

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