Horton

Re: JIT compiling - v4.0

Andres Freund <andres@anarazel.de>

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From: Andres Freund <andres@anarazel.de>
To: David Rowley <david.rowley@2ndquadrant.com>
Cc: Ants Aasma <ants.aasma@eesti.ee>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2017-10-05T17:26:17Z
Lists: pgsql-hackers 
On 2017-10-05 23:43:37 +1300, David Rowley wrote:
> On 5 October 2017 at 19:57, Andres Freund <andres@anarazel.de> wrote:
> > Here's some numbers for a a TPC-H scale 5 run. Obviously the Q01 numbers
> > are pretty nice in partcular. But it's also visible that the shorter
> > query can loose, which is largely due to the JIT overhead - that can be
> > ameliorated to some degree, but JITing obviously isn't always going to
> > be a win.
> 
> It's pretty exciting to see thing being worked on.
> 
> I've not looked at the code, but I'm thinking, could you not just JIT
> if the total cost of the plan is estimated to be > X ? Where X is some
> JIT threshold GUC.

Right, that's the plan. But it seems fairly important to make the
envelope in which it is beneficial as broad as possible. Also, test
coverage is more interesting for me right now ;)

Greetings,

Andres Freund

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".