buffer manager

"ravi chotalia" <bse_2004@hotmail.com> writes:

is there any version where simple LRU is used with 8-0-3's vacum
and BufferStrategyCDB stuff.

No. There never will be either, because that code is completely gone
in CVS tip.

[ This seems a tad off-topic for pgsql-general... ]

regards, tom lane

On Tue, Sep 13, 2005 at 04:38:27AM +0000, ravi chotalia wrote:

hi
i'm working on typical problem of comparing buffer manager's policies
(MRU/LRU/FIFO) and working on postgresql 8-03 . I read old versiona and
beta version and found 8-03 uses LRU 2q and the newer beta version is using
simple LRU but this time global buffer lock is used removing vacum process
in freelist. since i'm working on 8-03 and want to change my code as less
as possible , is there any version where simple LRU is used with 8-0-3's
vacum and BufferStrategyCDB stuff.

IIRC Neil Conway posted a patch to make 8.0.2 use LRU instead of ARC,
when the whole patent issue arised. You could search that in the
archives. OTOH, the current devel code uses an approach completely
different to both.

--
Alvaro Herrera -- Valdivia, Chile Architect, www.EnterpriseDB.com
"�Que diferencia tiene para los muertos, los hu�rfanos, y aquellos que han
perdido su hogar, si la loca destrucci�n ha sido realizada bajo el nombre
del totalitarismo o del santo nombre de la libertad y la democracia?" (Gandhi)

Alvaro Herrera wrote:

IIRC Neil Conway posted a patch to make 8.0.2 use LRU instead of ARC,
when the whole patent issue arised.

http://archives.postgresql.org/pgsql-patches/2005-01/msg00253.php

-Neil