On Tue, Mar 15, 2016 at 6:49 PM, Rostislav Pehlivanov
wrote:
> On 15 March 2016 at 23:21, Ganesh Ajjanagadde wrote:
>
>> On Tue, Mar 15, 2016 at 10:59 AM, Derek Buitenhuis
>> wrote:
>> > On 3/15/2016 2:56 PM, Ronald S. Bultje wrote:
>> >> Might be related to aacenc? But yes, we need to know over
On Tue, Mar 15, 2016 at 4:37 PM, Derek Buitenhuis
wrote:
> On 3/15/2016 10:26 PM, Ganesh Ajjanagadde wrote:
>> If one wants good Gaussian samples, then yes, I need a 64 bit rng.
>> Please also note that I can use av_lfg_get, it does not result in
>> slowdown, since speed benefits here come from th
On 15 March 2016 at 23:21, Ganesh Ajjanagadde wrote:
> On Tue, Mar 15, 2016 at 10:59 AM, Derek Buitenhuis
> wrote:
> > On 3/15/2016 2:56 PM, Ronald S. Bultje wrote:
> >> Might be related to aacenc? But yes, we need to know overall speed gain
> of
> >> some useful end user feature before/after th
On Wed, Mar 16, 2016 at 02:18:54AM +0100, Michael Niedermayer wrote:
> On Tue, Mar 15, 2016 at 11:37:30PM +, Derek Buitenhuis wrote:
> > On 3/15/2016 10:26 PM, Ganesh Ajjanagadde wrote:
> > > If one wants good Gaussian samples, then yes, I need a 64 bit rng.
> > > Please also note that I can us
On Tue, Mar 15, 2016 at 11:37:30PM +, Derek Buitenhuis wrote:
> On 3/15/2016 10:26 PM, Ganesh Ajjanagadde wrote:
> > If one wants good Gaussian samples, then yes, I need a 64 bit rng.
> > Please also note that I can use av_lfg_get, it does not result in
> > slowdown, since speed benefits here c
On Tue, Mar 15, 2016 at 11:37:30PM +, Derek Buitenhuis wrote:
> On 3/15/2016 10:26 PM, Ganesh Ajjanagadde wrote:
> > If one wants good Gaussian samples, then yes, I need a 64 bit rng.
> > Please also note that I can use av_lfg_get, it does not result in
> > slowdown, since speed benefits here c
On 3/15/2016 10:26 PM, Ganesh Ajjanagadde wrote:
> If one wants good Gaussian samples, then yes, I need a 64 bit rng.
> Please also note that I can use av_lfg_get, it does not result in
> slowdown, since speed benefits here come from the ziggurat algo.
> Concretely, it is 82 cycles vs 81 cycles; to
On Tue, Mar 15, 2016 at 10:59 AM, Derek Buitenhuis
wrote:
> On 3/15/2016 2:56 PM, Ronald S. Bultje wrote:
>> Might be related to aacenc? But yes, we need to know overall speed gain of
>> some useful end user feature before/after this.
>
> [13:42] <@atomnuker> well, AAC just requires the random num
On Tue, Mar 15, 2016 at 10:29 AM, Derek Buitenhuis
wrote:
> On 3/15/2016 4:46 AM, Ganesh Ajjanagadde wrote:
>> Concretely, it is nearly as fast as av_lfg_get (which only returns 32 bits),
>> and has a much smaller cache (128 bits). Thus, the timings should also
>> be more stable.
>>
>> This is nee
On 3/15/2016 2:56 PM, Ronald S. Bultje wrote:
> Might be related to aacenc? But yes, we need to know overall speed gain of
> some useful end user feature before/after this.
[13:42] <@atomnuker> well, AAC just requires the random numbers to be only
somewhat random
[13:43] <@atomnuker> you could pr
Hi,
On Tue, Mar 15, 2016 at 10:29 AM, Derek Buitenhuis <
derek.buitenh...@gmail.com> wrote:
> On 3/15/2016 4:46 AM, Ganesh Ajjanagadde wrote:
> > Concretely, it is nearly as fast as av_lfg_get (which only returns 32
> bits),
> > and has a much smaller cache (128 bits). Thus, the timings should al
On 3/15/2016 4:46 AM, Ganesh Ajjanagadde wrote:
> Concretely, it is nearly as fast as av_lfg_get (which only returns 32 bits),
> and has a much smaller cache (128 bits). Thus, the timings should also
> be more stable.
>
> This is needed because av_lfg_get<<32 | av_lfg_get is far slower, and
> like
This is based on the relatively well known xorshift128+ of Sebastiano
Vigna (https://en.wikipedia.org/wiki/Xorshift) that performs very well on the
BigCrush suite, is very efficient, and is thus used by a number of
clients: http://xorshift.di.unimi.it/ (see Introduction).
Moreover, the implementat
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