On Fri, Sep 16, 2016 at 9:09 AM, Pavan Deolasee <pavan.deola...@gmail.com>

> I also realised that we can compact the TID array in step (b) above
> because we only need to store 17 bits for block numbers (we already know
> which 1GB segment they belong to). Given that usable offsets are also just
> 13 bits, TID array needs only 4 bytes per TID instead of 6.
Actually this seems like a clear savings of at least 30% for all use cases,
at the cost of allocating in smaller chunks and doing some transformations.
But given the problem we are trying to solve, seems like a small price to


 Pavan Deolasee                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services

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