Dan Kennedy wrote:
On 04/04/2013 08:44 PM, Howard Chu wrote:
Richard Hipp wrote:
The memory-mapped I/O is only enabled for windows, linux, mac OS-X, and
solaris. We have found that it does not work on OpenBSD, for reasons we
have not yet been able to uncove; but as a precaution, memory mapped
I/O is
disabled by default on all of the *BSDs until we understand the problem.
As I understand it, OpenBSD lacks a unified buffer cache. They reported
problems with LMDB in its default mode, too.
But it works in some non-default mode? When both reads and writes are
done via memory mapping? Or some other trick?
Right. It works if you use a writable mmap and do all reads and writes thru
the map. But any process that comes along and accesses the file using read
will see invalid/stale information, and start double-caching the file pages.
--
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/
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