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List:       beowulf
Subject:    Re: [Beowulf] memory allocation on x86_64 returning huge addresses
From:       Greg Lindahl <lindahl () pathscale ! com>
Date:       2005-02-07 18:41:08
Message-ID: 20050207184108.GA1364 () greglaptop ! internal ! keyresearch ! com
[Download RAW message or body]

> The problem is that malloc returns an address that is way beyond
> 8billion which is not what I had expected.

This e-vile hack makes it produce something lower in memory. What it does
is turns off glibc's malloc algorithm's feature that has it mmap() large
malloc()s. Stuff into a .c, link the .o into your application.

-- greg

#include <stdio.h>
#include <malloc.h>

static void mem_init_hook(void);
static void *mem_malloc_hook(size_t, const void *);
static void *(*glibc_malloc)(size_t, const void *);
void (*__malloc_initialize_hook)(void) = mem_init_hook;

static void mem_init_hook(void)
{
  mallopt (M_MMAP_MAX, 0);
}
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