Horton

Re: JIT compiling with LLVM v12

Andres Freund <andres@anarazel.de>

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From: Andres Freund <andres@anarazel.de>
To: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
Cc: pgsql-hackers@postgresql.org
Date: 2018-03-28T21:27:51Z
Lists: pgsql-hackers 
On 2018-03-27 10:34:26 -0700, Andres Freund wrote:
> On 2018-03-27 10:05:47 -0400, Peter Eisentraut wrote:
> > On 3/13/18 19:40, Andres Freund wrote:
> > > I've pushed a revised and rebased version of my JIT patchset.
> > 
> > What is the status of this item as far as the commitfest is concerned?
> 
> 7/10 committed. Inlining, Explain, Docs remain.

I've pushed these three.

As explained in the inline commit, I've found an edge case where I could
hit an assert in LLVM when using a more efficient interaction with
on-disk files.  That appears to be a spurious assert, but I don't want
to ignore it until that's confirmed from the LLVM side of things.

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.

Yay. Also: Tired.

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".