Re: [Valgrind-users] valgring whith JudyArray

[Jeffrey S. <fe...@xi...>]

On Mon, 2003-11-24 at 06:32, Nicholas Nethercote wrote:
> On Mon, 24 Nov 2003, Salim SAYOURI wrote:
> 
> > It seems that the pointers used in Judy array are aligned on 8 bytes!  And
> > launching valgrind with the option --alignment=8 solves the problem.
> 
> This is a fairly common problem... perhaps we should just change
> Valgrind's allocator to align heap blocks on 8-byte boundaries?  I know
> that programs should, strictly speaking, be able to handle 4-byte
> alignments.

I'm not sure this is true. Most programs expect that malloc will return
a memory buffer aligned to be suitable for any data storage.

see the man page for malloc:

RETURN VALUE
       For calloc() and malloc(), the value returned is a pointer to the
allo-
       cated  memory,  which  is suitably aligned for any kind of
variable, or
       NULL if the request fails.

on x86, this would be 8.

Jeff

>   But it does cause difficult-to-understand problems with
> Memcheck.  Not sure.
> 
> N
> 
> 
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