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Re: Poor performance on Solaris
Brett @Google wrote:
On Fri, Feb 25, 2011 at 10:25 AM, Howard Chu <email@example.com
I will note that if you are going to use slowaris, I highly advise you set
a memory key rather than using on disk cache for BDB if your DB is any
over about 4 GB. Other than that, you'll generally just have to deal with
the fact it will be significantly slower than Linux.
Actually, you should always use a shared memory key on Solaris. Using
mmap'd files is just too slow on that OS.
Incidentlly, What is the uniqueness of a shared memory key, is it unique
amoung all instances on a single server ?
The significance of a shared memory key depends entirely on your operating
system. But by its nature, shared memory is global to a machine, so you can
assume that all keys must be unique on a particular machine.
I have personally only ever needed a shared memory key on one of a group of
But i noticed that the bdb logs are not written to disk when shared memory is
configured, is this a good or bad thing ?
The use of shared memory has no bearing on how the BDB library writes its
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/