From: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>
To: "Cristian Rodríguez" <cristian@rodriguez.im>
Cc: Wilco Dijkstra <Wilco.Dijkstra@arm.com>,
GNU C Library <libc-alpha@sourceware.org>
Subject: Re: [PATCH 2/2] Add single-threaded fast path to rand()
Date: Wed, 20 Mar 2024 11:27:25 -0300 [thread overview]
Message-ID: <ddc55095-8ca2-41f9-b647-2d3fde02714a@linaro.org> (raw)
In-Reply-To: <CAPBLoAdYdzN6ML7FZ=9TUn2_-2z91MOETfsx3ZB5Jxpj6U3j7Q@mail.gmail.com>
On 20/03/24 11:18, Cristian Rodríguez wrote:
> On Wed, Mar 20, 2024 at 9:31 AM Adhemerval Zanella Netto
> <adhemerval.zanella@linaro.org> wrote:
>
>
>> I don't have a strong opinion on this rand patch, if this idea is to
>> have it as an workbench for a possible single-thread lock optimization
>> it should be fine. It is just that I don't see much gain in optimizing
>> such a bad interface (although we still lack a proper userland PRNG).
>
> Yeah, it should be no surprise this interfaces are bad,
> I thought this was common knowledge.
>
> we need something like https://github.com/C2SP/C2SP/blob/main/chacha8rand.md
> which prety much outperforms even non-CS algorithms in at least 64 bit x86.
> but the question of the state remains.global? TLS? how to discard it
> in all the appropriate occasions?
And this is the arc4random in userspace discussion all over again.
next prev parent reply other threads:[~2024-03-20 14:27 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-18 15:20 Wilco Dijkstra
2024-03-18 19:24 ` Cristian Rodríguez
2024-03-19 15:44 ` Wilco Dijkstra
2024-03-20 12:31 ` Adhemerval Zanella Netto
2024-03-20 14:18 ` Cristian Rodríguez
2024-03-20 14:27 ` Adhemerval Zanella Netto [this message]
2024-03-21 7:39 ` Florian Weimer
2024-03-21 13:33 ` Cristian Rodríguez
2024-03-21 14:35 ` Mathieu Desnoyers
2024-03-21 15:07 ` Szabolcs Nagy
2024-03-21 15:18 ` Wilco Dijkstra
2024-03-21 15:53 ` Adhemerval Zanella Netto
2024-03-22 14:27 ` Zack Weinberg
2024-03-22 14:46 ` Adhemerval Zanella Netto
2024-03-22 15:30 ` Zack Weinberg
2024-03-22 18:05 ` Adhemerval Zanella Netto
2024-03-22 19:47 ` Mathieu Desnoyers
2024-03-22 22:54 ` Cristian Rodríguez
2024-03-23 14:01 ` Zack Weinberg
2024-03-23 15:23 ` Mathieu Desnoyers
2024-03-25 14:09 ` Mathieu Desnoyers
2024-03-25 17:52 ` Adhemerval Zanella Netto
2024-03-24 0:59 ` Cristian Rodríguez
2024-03-25 6:44 ` Florian Weimer
2024-03-20 14:28 ` Wilco Dijkstra
2024-03-20 14:40 ` Xi Ruoyao
-- strict thread matches above, loose matches on Subject: below --
2023-11-28 17:37 Wilco Dijkstra
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