Re: Before & After Under The Giant Lock
- From: Doug Barton <dougb@xxxxxxxxxxx>
- Date: Sun, 25 Nov 2007 16:48:30 -0800
Roman Divacky wrote:
On Sun, Nov 25, 2007 at 02:41:35PM -0600, Stephen Montgomery-Smith wrote:
On Sun, 25 Nov 2007, Robert Watson wrote:
........................I just want to add my 2 cents, that my recent experience with FreeBSD MP
In FreeBSD 8, I expect we'll see a continued focus on both locking
granularity and improving opportunities for kernel parallelism by better
distributing workloads over CPU pools. This is important because the
number of cores/chip is continuing to increase dramatically, so MP
performance is going to be important to keep working on. That said, the
results to date have been extremely promising, and I anticipate that we
will continue to find ways to better exploit multiprocessor hardware,
especially in the network stack.
has been extremely positive. I tend to use highly CPU bound MP programs,
typically lots and lots of floating point operations. It used to be that
Linux beat FreeBSD hands down - now FreeBSD seems to have a slight edge!
Basically my program runs about twice as fast when I run two threads as
opposed to one - I cannot see doing any better than that!
pure computation does not need kernel operations most of the time.. ie.
multi-threading kernel wont help much ;)
It has an indirect benefit by (presumably) not being in contention
with the userland process, and not needing slap Giant on the whole
system every few milliseconds.
Doug
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