Re: [HACKERS] sbufdesc' padding...

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От Bruce Momjian
Тема Re: [HACKERS] sbufdesc' padding...
Дата
Msg-id 199812020139.UAA08677@candle.pha.pa.us
обсуждение исходный текст
Ответ на Re: [HACKERS] sbufdesc' padding...  (Vadim Mikheev <vadim@krs.ru>)
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> "Thomas G. Lockhart" wrote:
> > 
> > > * ... this hack cut 10% off of the time to create the Wisconsin
> > > * database! It eats up more shared memory, of course, but we're
> > > * (allegedly) going to make some of these types bigger soon
> > > * anyway... -pma 1/2/93
> > > This is not true now:
> > > #define BufferDescriptorGetBuffer(bdesc) ((bdesc)->buf_id + 1)
> > > Comments ?...
> > 
> > Does that mean that we have re-introduced the slower allocation
> > technique sometime since 1993? 10% speed improvement for some operations
> > seems interesting...
> 
> Why slower allocation? BufferDescriptorGetBuffer used sizeof sbufdesc
> to get buffer number in 1993. Jolly/Andrew put buffer number
> (buf_id) into sbufdesc itself and so made sbufdesc padding
> useless.

Oh, then you can remove the padding.

--  Bruce Momjian                        |  http://www.op.net/~candle maillist@candle.pha.pa.us            |  (610)
853-3000+  If your life is a hard drive,     |  830 Blythe Avenue +  Christ can be your backup.        |  Drexel Hill,
Pennsylvania19026
 


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