multicore processing question
Ggatten at waddell.com
Wed Mar 17 19:31:16 UTC 2010
Thanks for posting the link to GCD. Interesting info is always welcomed!
From: owner-freebsd-questions at freebsd.org [mailto:owner-freebsd-questions at freebsd.org] On Behalf Of Adam Vande More
Sent: Wednesday, March 17, 2010 2:17 PM
To: Zepeda, Herbey
Cc: freebsd-questions at freebsd.org
Subject: Re: multicore processing question
On Wed, Mar 17, 2010 at 1:02 PM, Zepeda, Herbey <Herbey.Zepeda at atg.in.gov>wrote:
> I'm relatively new to FreeBSD and have had a hard time get to the right
> information relating multicore processing. I hope someone can give me some
> I have a two core processor and FreeBSD (latest stable release).
> If I have a c program that creates child processes with fork and exec (in a
> non blocking way), will the child processes be executed by FreeBSD in
> parallel using the different cores without me having to do special
> synchronization arrangements to my program?
Well probably...processes are automatically on SMP kernels so a basic
example is if you have 2 cores and 2 processes which are each utilizing 100%
of cpu time, then each process would be assigned to a separate core.
However in practice executions states are much more complicated and both
processes may be assigned to a single core under certain conditions eg one
is in a sleep state. The short story is this is all handled automatically,
and many applications run just fine without any further tweaking
> Will I need threads instead of processes?
Really depends on your need, but in general properly creating threaded safe
applications is significantly harder(at least to my understanding, I don't
do it). If you need to use this route, you can check out
It's available on FreeBSD.
Adam Vande More
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