(gmp.info.gz) Memory Management

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 Memory Management
 =================
 
 The GMP types like `mpz_t' are small, containing only a couple of sizes,
 and pointers to allocated data.  Once a variable is initialized, GMP
 takes care of all space allocation.  Additional space is allocated
 whenever a variable doesn't have enough.
 
    `mpz_t' and `mpq_t' variables never reduce their allocated space.
 Normally this is the best policy, since it avoids frequent reallocation.
 Applications that need to return memory to the heap at some particular
 point can use `mpz_realloc2', or clear variables no longer needed.
 
    `mpf_t' variables, in the current implementation, use a fixed amount
 of space, determined by the chosen precision and allocated at
 initialization, so their size doesn't change.
 
    All memory is allocated using `malloc' and friends by default, but
 this can be changed, see  Custom Allocation.  Temporary memory
 on the stack is also used (via `alloca'), but this can be changed at
 build-time if desired, see  Build Options.
 

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(gmp.info.gz) Parameter Conventions

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