| From: | Craig Ringer <craig(at)2ndquadrant(dot)com> |
|---|---|
| To: | Hao Lee <mixtrue(at)gmail(dot)com> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, PostgreSQL hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Do we need the gcc feature "__builtin_expect" to promote the branches prediction? |
| Date: | 2017-06-06 03:06:55 |
| Message-ID: | CAMsr+YGn94r9NXEtgmMATYFaKKd-ndyqpFxzb02Z_8mtU8QCFA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On 6 June 2017 at 10:44, Hao Lee <mixtrue(at)gmail(dot)com> wrote:
> and another things come into my mind, in some scenario, as we know that the
> native library is not the most effective way to do that, such as, allocation
> a large amount of memories by using "alloc()"... and "memmove()", so on. As
> the SIMD instruction became the standard in CPU, therefore, we can that to
> do something more effectively. for example, using SIMD to impl
> 'alloc',"memmove" and so on, or the other database operations. and it seems
> that there some one have done this job.
Compilers are already pretty good at this.
https://en.wikipedia.org/wiki/Program_optimization
--
Craig Ringer http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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