Horton

Re: JIT compiling with LLVM v11

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

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@anarazel.de>
Cc: Catalin Iacob <iacobcatalin@gmail.com>, Thomas Munro <thomas.munro@enterprisedb.com>, Pg Hackers <pgsql-hackers@postgresql.org>, Pierre Ducroquet <p.psql@pinaraf.info>
Date: 2018-03-15T16:42:54Z
Lists: pgsql-hackers 
Andres Freund <andres@anarazel.de> writes:
> On 2018-03-15 12:33:08 -0400, Tom Lane wrote:
>> The "software collections" stuff was still in its infancy when I left
>> Red Hat, so things might've changed, but I'm pretty sure at the time
>> it was verboten for any mainstream package to depend on an SCL one.

> But we won't get PG 11 into RHEL7.x either way, no?

Well, they've been known to back-port newer releases of PG into older
RHEL; I wouldn't necessarily assume it'd happen for 11, but maybe 12
or beyond could be made available for RHEL7 at some point.

>> But they very probably wouldn't want postgresql depending on a
>> compiler package even if the dependency was mainstream, so I rather
>> doubt that you'll ever see an --enable-jit PG build out of there,
>> making this most likely moot as far as the official RH package goes.
>> I don't know what Devrim's opinion might be about PGDG.

> It'd be a build not runtime dependency, doesn't that change things?

How could it not be a runtime dependency?  You're not proposing that
we'd embed all of LLVM into a Postgres package are you?  If you are, be
assured that Red Hat will *never* ship that.  Static linking/embedding of
one package in another is forbidden for obvious maintainability reasons.
I would think that other distros have similar policies.

			regards, tom lane

Commits

  1. Improve JIT docs.

  2. Add documentation for the JIT feature.

  3. Add EXPLAIN support for JIT.

  4. Add inlining support to LLVM JIT provider.

  5. JIT tuple deforming in LLVM JIT provider.

  6. Add FIELDNO_* macro designating offset into structs required for JIT.

  7. Add expression compilation support to LLVM JIT provider.

  8. Expand list of synchronized types and functions in LLVM JIT provider.

  9. Add helpers for emitting LLVM IR.

  10. Basic planner and executor integration for JIT.

  11. Debugging and profiling support for LLVM JIT provider.

  12. Support for optimizing and emitting code in LLVM JIT provider.

  13. Add file containing extensions of the LLVM C API.

  14. Basic JIT provider and error handling infrastructure.

  15. Add configure infrastructure (--with-llvm) to enable LLVM support.

  16. Add C++ support to configure.

  17. Add PGAC_PROG_VARCC_VARFLAGS_OPT autoconf macro.

  18. Fix VM buffer pin management in heap_lock_updated_tuple_rec().

  19. Allow tupleslots to have a fixed tupledesc, use in executor nodes.

  20. Expression evaluation based aggregate transition invocation.

  21. Perform slot validity checks in a separate pass over expression.

  22. Rely on executor utils to build targetlist for DML RETURNING.

  23. Refer to OS X as "macOS", except for the port name which is still "darwin".