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daan 2019-06-20 08:01:39 -07:00
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@ -27,13 +27,13 @@ Notable aspects of the design include:
many smaller lists per memory "page" which both reduces fragmentation many smaller lists per memory "page" which both reduces fragmentation
and increases locality -- and increases locality --
things that are allocated close in time get allocated close in memory. things that are allocated close in time get allocated close in memory.
(A memory "page" in mimalloc contains blocks of one size class and is (A memory "page" in _mimalloc_ contains blocks of one size class and is
usually 64KB on a 64-bit system). usually 64KiB on a 64-bit system).
- __eager page reset__: when a "page" becomes empty (with increased chance - __eager page reset__: when a "page" becomes empty (with increased chance
due to free list sharding) the memory is marked to the OS as unused ("reset" or "purged") due to free list sharding) the memory is marked to the OS as unused ("reset" or "purged")
reducing (real) memory pressure and fragmentation, especially in long running reducing (real) memory pressure and fragmentation, especially in long running
programs. programs.
- __secure__: mimalloc can be build in secure mode, adding guard pages, - __secure__: _mimalloc_ can be build in secure mode, adding guard pages,
randomized allocation, encrypted free lists, etc. to protect against various randomized allocation, encrypted free lists, etc. to protect against various
heap vulnerabilities. The performance penalty is only around 3% on average heap vulnerabilities. The performance penalty is only around 3% on average
over our benchmarks. over our benchmarks.