fast_allocator.hpp File Reference

Optional faster allocator for GMP/MPFR/MPC limb allocation. More...

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Namespaces
namespace	bertini

Functions
void	bertini::InstallFastAllocator ()
	Install the fast multiprecision allocator (idempotent; safe to call more than once).

Detailed Description

Optional faster allocator for GMP/MPFR/MPC limb allocation.

Adaptive-precision tracking spends roughly half its time in mpfr/mpc allocate/free of small, short-lived limb buffers. Routing GMP's allocator (which mpfr and mpc allocate through) to a fast thread-caching allocator (mimalloc) makes each of those allocations far cheaper, with no change to the numerics – measured ~16% wall-clock on a representative adaptive solve.

This installs an ownership-aware hook via GMP's mp_set_memory_functions, calling mimalloc's mi_* explicitly (mimalloc is built NON-override, so the process malloc is untouched – safe for a Python extension sharing the interpreter with NumPy and other GMP users such as gmpy2). The hook is ownership-aware (mi_is_in_heap_region) so it correctly frees/reallocs GMP objects that were allocated by the default allocator before the hook was installed (e.g. during static init, or by another library imported first) – so it is safe to install at any time.

When built with -DBERTINI2_FAST_ALLOC=OFF (no mimalloc), InstallFastAllocator() is a no-op. At runtime, setting the environment variable BERTINI2_NO_FAST_ALLOC also disables it.