From: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
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To: | ZEUGSWETTER Andreas IZ5 <Andreas(dot)Zeugswetter(at)telecom(dot)at> |
Cc: | PostgreSQL-development <pgsql-hackers(at)postgreSQL(dot)org> |
Subject: | Re: [HACKERS] sgmr* vs. md* |
Date: | 1999-05-19 16:31:27 |
Message-ID: | 199905191631.MAA27780@candle.pha.pa.us |
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Lists: | pgsql-hackers |
>
> > smgr is a generic i/o interface layer that allows multiple storage
> > managers. Currently, we always use DEFAULT_SMGR as a parameter to smgr*
> > functions, causing calls to the md* routines. Is there any value in
> > just removing the smgr layer completely. It was originally for a CD
> > jutebox i/o layer in addition to our current disk i/o layer.
> >
> Wouldn't this be the interface for a tablespace i/o manager ?
> A tablespace has the advatage of only needing a number of files
> for thousands of small tables, and reduces the overhead of many
> open file handles. A tablespace is also needed before raw devices
> can be efficiently exploited.
Good point.
--
Bruce Momjian | http://www.op.net/~candle
maillist(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
+ Christ can be your backup. | Drexel Hill, Pennsylvania 19026
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