TMPFS, is it available on FreeBSD 6 or 7?
kris at obsecurity.org
Thu Aug 2 19:09:31 UTC 2007
On Thu, Aug 02, 2007 at 08:28:18PM +0200, Oliver Fromme wrote:
> Sten Daniel Soersdal wrote:
> > Is TMPFS available on FreeBSD 6 or 7?
> > Or do i have to settle for mfs?
> > [venting frustration]
> > The reason i ask is i need something very flexible when it comes to
> > memory usage as a poor-mans shared-memory feature for a closed source
> > data conversion app, used only occasionally but with *alot* of data
> > passing through. By alot i mean it took our quad core xeon 3 ghz with
> > 4 gbyte memory and 4 SAS drives in 1+0 RAID, about a day and a half to
> > process (on disk).
> > Simple tests (by others) using netbsd on a single cpu 3 ghz and tmpfs,
> > it took roughly 70 minutes. Most of which was spent loading and
> > unloading the data over the network.
> > I'd really like that memory back after use for other things as this
> > server is also serving databases with files etc.
> If you only need it occasionally, but not permanently,
> then why don't you simply mount an MD filesystem on some
> non-standard name (i.e. not /tmp) and use it, and when
> you're done you simply umount it. You get all memory
> back then.
There is also a patch from pjd that will reclaim memory from md upon
file deletion. It should apply to 6.x possibly with some changes. If
you are unable to use 7.0 for some reason then I can send this to you
to work on.
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