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Permit super-MaxAllocSize allocations with MemoryContextAllocHuge().

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The MaxAllocSize guard is convenient for most callers, because it
reduces the need for careful attention to overflow, data type selection,
and the SET_VARSIZE() limit.  A handful of callers are happy to navigate
those hazards in exchange for the ability to allocate a larger chunk.
Introduce MemoryContextAllocHuge() and repalloc_huge().  Use this in
tuplesort.c and tuplestore.c, enabling internal sorts of up to INT_MAX
tuples, a factor-of-48 increase.  In particular, B-tree index builds can
now benefit from much-larger maintenance_work_mem settings.

Reviewed by Stephen Frost, Simon Riggs and Jeff Janes.
This commit is contained in:
Noah Misch
2013-06-27 14:53:57 -04:00
parent 9ef86cd994
commit 263865a489
7 changed files with 183 additions and 98 deletions
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2
src/include/utils/tuplesort.h
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@@ -106,7 +106,7 @@ extern void tuplesort_get_stats(Tuplesortstate *state,
const char **spaceType,
long *spaceUsed);
extern int tuplesort_merge_order(long allowedMem);
extern int tuplesort_merge_order(Size allowedMem);
/*
* These routines may only be called if randomAccess was specified 'true'.