> This is unfair to mmap since mmap is called once
> per page. Better to mmap large regions (many
> pages at once), then use msync() to force
> write any modified pages. Access purely in
> memory mmap'd I/O is _many_ times faster than
> read/write under Solaris or Linux later
> than 2.1.99 (prior to 2.1.99, Linux had
> slow mmap performance).
This makes me feel better. Linux is killing BSD/OS in mapping tests.
See my other posting.
Bruce Momjian | 830 Blythe Avenue
maillist(at)candle(dot)pha(dot)pa(dot)us | Drexel Hill, Pennsylvania 19026
+ If your life is a hard drive, | (610) 353-9879(w)
+ Christ can be your backup. | (610) 853-3000(h)
In response to
pgsql-hackers by date
|Next:||From: ocie||Date: 1998-05-15 22:50:45|
|Subject: Re: [HACKERS] mmap vs read/write|
|Previous:||From: Internet Wire||Date: 1998-05-15 20:30:28|
|Subject: Internet Wire|