PostgreSQL 11 Won't Ship With Its Faster JIT Support Enabled By Default
Written by Michael Larabel in Free Software on 16 September 2018 at 06:46 AM EDT. 2 Comments
FREE SOFTWARE --
One of the coolest innovations landing this year in PostgreSQL was LLVM-based JIT support to speed up database queries. But it's not going to be enabled by default in the upcoming PostgreSQL 11 release.

This functionality relies upon LLVM for JIT compiling SQL queries rather than passing those queries to the PostgreSQL interpreter. These LLVM JIT'ed queries have led to more efficient code being generated and particularly help with more complex queries.

The PostgreSQL JIT can be up to 20% faster in some database benchmarks and for more basic tasks like index creation was 5~19% faster.

PostgreSQL 11 has been working towards a release and up until now the JIT functionality has been enabled by default, but now developers have determined to disabled it by default for this next major stable update.

They fear the JIT back-end could introduce some regressions and just isn't mature enough yet to ship it enabled by default. But in the development Git code they will continue to leave it on for additional testing, hopefully we'll see it enabled for PostgreSQL 12.

They disabled it this weekend for the 11 release and have provided additional commentary on the project's mailing list.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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