Horton

Re: pgbench - add pseudo-random permutation function

Suzuki Hironobu <hironobu@interdb.jp>

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From: Hironobu SUZUKI <hironobu@interdb.jp>
To: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Cc: Fabien COELHO <coelho@cri.ensmp.fr>, Alvaro Herrera <alvherre@2ndquadrant.com>
Date: 2019-02-10T17:46:15Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. pgbench: Function to generate random permutations.

  2. Add basic support for using the POPCNT and SSE4.2s LZCNT opcodes

  3. Further improve code for probing the availability of ARM CRC instructions.

Attachments

I updated the patch. And also I added some explanations and simple 
examples in the modular_multiply function.

Fabian-san,

To make easily understanding, I think it is a good idea to add a brief 
explanation of outline the pseudorandom_perm function and bijective 
functions/transformations. What do you think about?

Best regards,

On 2019/02/02 1:16, Michael Paquier wrote:
> On Thu, Oct 25, 2018 at 08:21:27AM +0200, Fabien COELHO wrote:
>> Thanks for the hint. Here is an updated patch using this marker.
>>
>> I noticed that some instances use a closing "*-----" sequence, but it does
>> not seem useful, so I left it out.
>>
>> I have also tried to improve a few comments, and moved a declaration into a
>> loop because I did not like the pg-indented version much.
> 
> This patch is marked as ready for committer for some time now, and it
> has rotten, so I am moving it to next CF, waiting on author.
> --
> Michael
>