On 20 Jan 2012, at 00:46, David Xu wrote:
It depends on hardware, if it is a large machine with lots of cpu,
a small conflict on dual-core machine can become a large conflict
on large machine because it is possible more cpus are now
running same code which becomes a bottleneck. On a large
On Thursday, January 19, 2012 7:36:33 pm David Xu wrote:
On 2012/1/19 23:23, John Baldwin wrote:
On Thursday, January 19, 2012 12:57:50 am David Xu wrote:
rdtsc() may not work on SMP, so I have updated it to use clock_gettime
to get total time.
On Thursday, January 19, 2012 12:57:50 am David Xu wrote:
rdtsc() may not work on SMP, so I have updated it to use clock_gettime
to get total time.
http://people.freebsd.org/~davidxu/bench/semaphore2/
http://people.freebsd.org/%7Edavidxu/bench/semaphore2/
Still, lfence is a lot faster
On Thu, 19 Jan 2012, John Baldwin wrote:
On Thursday, January 19, 2012 12:57:50 am David Xu wrote:
rdtsc() may not work on SMP, so I have updated it to use clock_gettime
to get total time.
http://people.freebsd.org/~davidxu/bench/semaphore2/
On Fri, 20 Jan 2012, Bruce Evans wrote:
...
% + v = *p; \
% + __asm __volatile(lfence ::: memory);\
Style bug (missing spaces around binary operator `:') which becomes
a syntax error for C++. Other places in this file use ` : : : '.
Hi David,
* David Xu listlog2...@gmail.com, 20120116 08:53:
but since atomic.h does not have a full barrier atomic operation
interface, I intend to add a rmb() here.
In the very nearby future (after I switch SPARC64 and MIPS to
libcompiler_rt), it should be possible to safely use C11's
On 19 Jan 2012, at 18:09, Ed Schouten wrote:
In the very nearby future (after I switch SPARC64 and MIPS to
libcompiler_rt), it should be possible to safely use C11's stdatomic.h
on all supported architectures. The C11 interface allows any operation
to be combined with any type of barrier.
On 2012/1/19 23:23, John Baldwin wrote:
On Thursday, January 19, 2012 12:57:50 am David Xu wrote:
rdtsc() may not work on SMP, so I have updated it to use clock_gettime
to get total time.
http://people.freebsd.org/~davidxu/bench/semaphore2/
http://people.freebsd.org/%7Edavidxu/bench/semaphore2/
On 2012/1/20 0:55, Bruce Evans wrote:
On Thu, 19 Jan 2012, John Baldwin wrote:
On Thursday, January 19, 2012 12:57:50 am David Xu wrote:
rdtsc() may not work on SMP, so I have updated it to use clock_gettime
to get total time.
http://people.freebsd.org/~davidxu/bench/semaphore2/
On 2012/1/18 23:09, John Baldwin wrote:
On Tuesday, January 17, 2012 9:09:25 pm David Xu wrote:
On 2012/1/17 22:57, John Baldwin wrote:
On Monday, January 16, 2012 1:15:14 am David Xu wrote:
Author: davidxu
Date: Mon Jan 16 06:15:14 2012
New Revision: 230201
URL:
On 2012/1/19 11:24, David Xu wrote:
On 2012/1/18 23:09, John Baldwin wrote:
On Tuesday, January 17, 2012 9:09:25 pm David Xu wrote:
On 2012/1/17 22:57, John Baldwin wrote:
On Monday, January 16, 2012 1:15:14 am David Xu wrote:
Author: davidxu
Date: Mon Jan 16 06:15:14 2012
New Revision:
On Monday, January 16, 2012 1:15:14 am David Xu wrote:
Author: davidxu
Date: Mon Jan 16 06:15:14 2012
New Revision: 230201
URL: http://svn.freebsd.org/changeset/base/230201
Log:
Insert read memory barriers.
I think using atomic_load_acq() on sem-nwaiters would be clearer as it would
On 2012/1/17 22:57, John Baldwin wrote:
On Monday, January 16, 2012 1:15:14 am David Xu wrote:
Author: davidxu
Date: Mon Jan 16 06:15:14 2012
New Revision: 230201
URL: http://svn.freebsd.org/changeset/base/230201
Log:
Insert read memory barriers.
I think using atomic_load_acq() on
Author: davidxu
Date: Mon Jan 16 06:15:14 2012
New Revision: 230201
URL: http://svn.freebsd.org/changeset/base/230201
Log:
Insert read memory barriers.
Modified:
head/lib/libc/gen/sem.c
head/lib/libc/gen/sem_new.c
Modified: head/lib/libc/gen/sem.c
On 01/16/12 17:15, David Xu wrote:
Author: davidxu
Date: Mon Jan 16 06:15:14 2012
New Revision: 230201
URL: http://svn.freebsd.org/changeset/base/230201
Log:
Insert read memory barriers.
Modified:
head/lib/libc/gen/sem.c
head/lib/libc/gen/sem_new.c
Could you please provide a bit
On 2012/1/16 15:39, Lawrence Stewart wrote:
On 01/16/12 17:15, David Xu wrote:
Author: davidxu
Date: Mon Jan 16 06:15:14 2012
New Revision: 230201
URL: http://svn.freebsd.org/changeset/base/230201
Log:
Insert read memory barriers.
Modified:
head/lib/libc/gen/sem.c
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