Re: Is Intel exceptionally unsuccessful as an architecture designer?

On 9/21/24 18:49, jseigh wrote:

 Well, we have asymmetric memory barriers now (membarrier() in linux)
so we can get rid of memory barriers in some cases.  For hazard
pointers which used to be a (load, store, mb, load) are now just
a (load, store, load).  Much faster,  from 8.02 nsecs to 0.79 nsecs.
So much so that other things which has heretofore been considered
to add negligible overhead are not so much by comparison.  Which can
be a little annoying because some like using those a lot.
 

I should correct those timings slightly.  The measurements were for a
hazard pointer load, a dummy dependent load, and a hazard pointer clear.
If I measure w/o the dummy dependent load, the timings go from
7.75 to 0.61 nsecs respectively.
Joe Seigh