| From: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | count0(at)fsj(dot)co(dot)jp |
| Cc: | hackers(at)postgreSQL(dot)org |
| Subject: | Re: [HACKERS] mmap vs read/write |
| Date: | 1998-05-15 22:16:58 |
| Message-ID: | 199805152216.SAA21606@candle.pha.pa.us |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
> 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)
| From | Date | Subject | |
|---|---|---|---|
| Next Message | ocie | 1998-05-15 22:50:45 | Re: [HACKERS] mmap vs read/write |
| Previous Message | Internet Wire | 1998-05-15 20:30:28 | Internet Wire |