Horton

Re: JIT compiling with LLVM v9.0

Peter Eisentraut <peter.eisentraut@2ndquadrant.com>

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From: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
To: Robert Haas <robertmhaas@gmail.com>, Andres Freund <andres@anarazel.de>
Cc: Thomas Munro <thomas.munro@enterprisedb.com>, Jeff Davis <pgsql@j-davis.com>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2018-02-01T13:46:08Z
Lists: pgsql-hackers 
On 1/31/18 14:45, Robert Haas wrote:
> We could do that, but I'd be more inclined just to let JIT be
> magically enabled.  In general, if a user could do 'yum install ip4r'
> (for example) and have that Just Work without any further database
> configuration,

One way to do that would be to have a system-wide configuration file
like /usr/local/pgsql/etc/postgresql/postgresql.conf, which in turn
includes /usr/local/pgsql/etc/postgresql/postgreql.conf.d/*, and have
the add-on package install its configuration file with the setting jit =
on there.

Then again, if we want to make it simpler, just link the whole thing in
and turn it on by default and be done with it.

Presumably, there will be planner-level knobs to model the jit startup
time, and if you don't like it, you can set that very high to disable
it.  So we don't necessarily need a separate turn-it-off-it's-broken
setting.

-- 
Peter Eisentraut              http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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".