On Wed, 10 Jan 2001, David Miller wrote:
> On Wed, 10 Jan 2001, Tom Samplonius wrote:
> > On Wed, 10 Jan 2001, Lauri Laupmaa wrote:
> > ...
> > > It seems that on SMP mysql doesn't scale well. (currently testing on
> > > dual 833 PIII and running on couple older dual systems)
> > Because there is no such thing as SMP mysql. It is a single process,
> > and can only run on a single processor at a time.
> My understanding is that it's single process but multithreaded. When I
> asked a very similar question on a mysql list a year ago I was told that
> on linux it ran much better on multiple cpu's.
You can however compile mysql with linuxthreads. BTW, the linuxthreads
is a full FreeBSD port of the linuxthreads package, which provides
pseudo-process threads. These threads are scheduled as processes and you
will see a performance improvement with SMP. Linux threads are rather
heavy weight, so this solution has not been included as the standard
Standard FreeBSD theads are now (as 4.2-stable) solid and reliable.
Reliability has been inconsistant. I have a 3.5-STABLE system using mysql
and the native threads on a 2 GB database. No problems. Standard FreeBSD
threads have less overhead that threads on Linux, or Linux-like threads on
> --- David
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