This one too.

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---------- Forwarded message ---------- From: Stuart Henderson stu@spacehopper.org Date: Tue, Jan 15, 2013 at 6:41 AM Subject: Re: adding support to mdb To: Friedrich Locke friedrich.locke@gmail.com

On 2013/01/14 21:31, Friedrich Locke wrote:

Hi!

people from openldap group have already migrated to mdb. Why OpenBSD has such problems. On other OSes, things work nicely. BTW, no offense, i do like obsd, but things like make me upset.

I suspect that the MDB code probably requires something from the OS that OpenBSD doesn't have (coherent buffer and page caches - http://utcc.utoronto.ca/~cks/space/blog/unix/UnifiedCacheMmap)

If I'm correct then it will appear to work, but with a risk of database corruption. For this reason I won't enable this in the OpenLDAP port unless someone who knows the area well is satisfied that it's safe.

Some other database code which likes to use mmap (e.g. cyrus skiplist) takes into account the various types of cache behaviour and has options to avoid using mmap. It doesn't appear that MDB has this yet.