Horton

Re: Change GUC hashtable to use simplehash?

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Jeff Davis <pgsql@j-davis.com>
Cc: Gurjeet Singh <gurjeet@singh.im>, pgsql-hackers@postgresql.org
Date: 2023-11-17T22:04:04Z
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. Silence warning in older versions of Valgrind

  2. Revert "Speed up tail processing when hashing aligned C strings, take two"

  3. Speed up tail processing when hashing aligned C strings, take two

  4. Teach fasthash_accum to use platform endianness for bytewise loads

  5. Add macro to disable address safety instrumentation

  6. Convert uses of hash_string_pointer to fasthash equivalent

  7. Speed up tail processing when hashing aligned C strings

  8. Add helper functions for dshash tables with string keys.

  9. Fix warnings in cpluspluscheck

  10. Further cosmetic review of hashfn_unstable.h

  11. Simplify initialization of incremental hash state

  12. Add optimized C string hashing

  13. Add inline incremental hash functions for in-memory use

  14. Make all Perl warnings fatal

Jeff Davis <pgsql@j-davis.com> writes:
> On Fri, 2023-11-17 at 13:22 -0800, Gurjeet Singh wrote:
>> But your argument of a nicer API might make a case for the patch.

> Yeah, that's what I was thinking. simplehash is newer and has a nicer
> API, so if we like it and want to move more code over, this is one
> step. But if we are fine using both hsearch.h and simplehash.h for
> overlapping use cases indefinitely, then I'll drop this.

I can't imagine wanting to convert *every* hashtable in the system
to simplehash; the added code bloat would be unreasonable.  So yeah,
I think we'll have two mechanisms indefinitely.  That's not to say
that we might not rewrite hsearch.  But simplehash was never meant
to be a universal solution.

			regards, tom lane