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Commita0a08c1

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Fix mistakes in the just added JIT docs.
Reported-By: Lukas FittlAuthor: Andres Freund
1 parente6c039d commita0a08c1

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3 files changed

+13
-7
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3 files changed

+13
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‎doc/src/sgml/config.sgml

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@@ -7498,7 +7498,7 @@ SET XML OPTION { DOCUMENT | CONTENT };
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used. The built-in default is <literal>llvmjit</literal>.
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</para>
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<para>
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If set to a non-existent library <acronym>JIT</acronym> will not
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If set to a non-existent library <acronym>JIT</acronym> will not be
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available, but no error will be raised. This allows JIT support to be
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installed separately from the main
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<productname>PostgreSQL</productname> package.

‎doc/src/sgml/jit.sgml

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@@ -32,9 +32,9 @@
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</para>
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<para>
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<productname>PostgreSQL</productname> has builtin support perform
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<productname>PostgreSQL</productname> has builtin supporttoperform
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<acronym>JIT</acronym> using <ulink
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url="https://llvm.org/"><productname>LLVM</productname></ulink> when built
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url="https://llvm.org/"><productname>LLVM</productname></ulink> when
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<productname>PostgreSQL</productname> was built with
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<literal>--with-llvm</literal> (see <xref linkend="configure-with-llvm"/>).
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</para>

‎src/backend/jit/README

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@@ -74,7 +74,7 @@ the shared library providing JIT support can be loaded (i.e. postgres
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was compiled with LLVM support and the shared library is installed),
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the task of JIT compiling an expression gets handed of to shared
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library. This obviously requires that the function in jit.c is allowed
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to fail in casenot JIT provider can be loaded.
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to fail in caseno JIT provider can be loaded.
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Which shared library is loaded is determined by the jit_provider GUC,
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defaulting to "llvmjit".
@@ -174,7 +174,7 @@ least a few postgres types. While it is possible to inform LLVM about
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type definitions by recreating them manually in C code, that is failure
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prone and labor intensive.
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Insteadthe is one small file (llvmjit_types.c) which references each of
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Insteadthere is one small file (llvmjit_types.c) which references each of
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the types required for JITing. That file is translated to bitcode at
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compile time, and loaded when LLVM is initialized in a backend.
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@@ -232,10 +232,16 @@ an ExprState, rather than absolute pointers into memory.
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Once that is addressed, adding an LRU cache that's keyed by the
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generated LLVM IR will allow to use optimized functions even for
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shorter functions.
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faster queries.
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A longer term project is to move expression compilation to the planner
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stage, allowing to tie
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stage, allowing e.g. to tie compiled expressions to prepared
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statements.
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An even more advanced approach would be to use JIT with few
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optimizations initially, and build an optimized version in the
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background. But that's even further off.
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What to JIT
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===========

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