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Introduce macro for disabling allocator mmapping.

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This commit is contained in:
Maxim Akhmedov 2020-01-24 01:12:01 +03:00
parent c698132cca
commit 2f12866bc2
1 changed files with 7 additions and 2 deletions
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9
dbms/src/Common/Allocator.h
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@ -50,16 +50,21 @@
*
* P.S. This is also required, because tcmalloc can not allocate a chunk of
* memory greater than 16 GB.
*
* P.P.S. Note that MMAP_THRESHOLD symbol is intentionally made weak. It allows
* to override it during linkage when using ClickHouse as a library in
* third-party applications which may already use own allocator doing mmaps
* in the implementation of alloc/realloc.
*/
#ifdef NDEBUG
static constexpr size_t MMAP_THRESHOLD = 64 * (1ULL << 20);
__attribute__((__weak__)) extern const size_t MMAP_THRESHOLD = 64 * (1ULL << 20);
#else
/**
* In debug build, use small mmap threshold to reproduce more memory
* stomping bugs. Along with ASLR it will hopefully detect more issues than
* ASan. The program may fail due to the limit on number of memory mappings.
*/
static constexpr size_t MMAP_THRESHOLD = 4096;
__attribute__((__weak__)) extern const size_t MMAP_THRESHOLD = 4096;
#endif
static constexpr size_t MMAP_MIN_ALIGNMENT = 4096;