Memory issue

[Sam Rawlins]

Hi Craig,

Did you look into MPFR's mpfr_exp?
http://www.mpfr.org/mpfr-current/mpfr.html#Special-Functions

Do you run out of memory when you only run "the inner loop" 1000 times? 100?
10?

We're pretty blind without any source code.

On Thu, Dec 16, 2010 at 3:47 PM, Craig Helfgott <chelfgott at gmail.com> wrote:

> I am in the process of writing a program using GMP in C++, and am hitting a
> memory issue.  Specifically, I have a subroutine that will output e^x for x
> an mpf_class variable.  It works using the standard binary splitting
> algorithm, and is fairly fast even though I am currently working with
> 32,768-bit numbers.  I am running it a few thousand times in the inner loop
> of my program.  I of course expect this to take some time, perhaps a day at
> most, but I do not expect it to take much memory, since I only have at most
> 50 such variables active at any one time.  However, when I run my program,
> it immediately eats up the memory in my system.  Do I need to do mpf_clear
> in my exp subroutine?  (I thought the C++ interface would handle that for
> me.)  Is my compiler for some reason unwrapping my loop and trying to
> parallelize? (I'm using g++ with no special flags aside from -lgmp and
> -lgmpxx).
>
> Help?
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-- 
Sam Rawlins