Horton

Re: JIT compiling with LLVM v12

Noah Misch <noah@leadboat.com>

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From: Noah Misch <noah@leadboat.com>
To: Andres Freund <andres@anarazel.de>
Cc: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>, pgsql-hackers@postgresql.org
Date: 2018-08-25T17:36:03Z
Lists: pgsql-hackers 
On Wed, Aug 22, 2018 at 06:20:21AM +0000, Noah Misch wrote:
> On Wed, Mar 28, 2018 at 02:27:51PM -0700, Andres Freund wrote:
> > For now LLVM is enabled by default when compiled --with-llvm. I'm mildly
> > inclined to leave it like that until shortly before the release, and
> > then disable it by default (i.e. change the default of jit=off). But I
> > think we can make that decision based on experience during the testing
> > window. I'm opening an open items entry for that.
> 
> I'll vote for jit=on and letting any bugs shake out earlier, but it's not a
> strong preference.

In light of later discussion on this thread, my preference bore undue
optimism.  I maintain that vote philosophically, but that course of action
probably entails too much short-term development work.  jit=off is reasonable,
along with documentation changes to set expectations.

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".