Re: [Valgrind-users] Valgrind 2.2.0 memcheck failure on RedHat 8.0

[Nicholas N. <nj...@ca...>]

On Wed, 22 Sep 2004 dou...@so... wrote:

> I think the error message should be changed to give a better idea of what
> went wrong and how to fix it.
>
> In the mean time perhaps an entry on the FAQ would help people:
>
> """
> When I start valgrind 2.2.0 I get:
> valgrind: Couldn't allocate address space for shadow memory
> valgrind: Are you using a kernel with a small user address space,
> valgrind: or do you have your virtual memory size limited?
> What's going on?
>
> Are you running on Red Hat 8.0? Do you have overcommit on/off [delete as
> appropriate] switched on? Valgrind is [insert description of what it's
> trying to do]
> Try creating 2/4 [delete as appropriate] Gb of swap space.
> """

Yes, the error message here is bad.  It went into 2.2.0 at the last 
minute.  It is better than the old one, which was just an assertion 
failure :)  We did not even know that a too-small swap space caused it 
when the message was written, which is why it is not mentioned in the 
message.  I will improve the message and look at improving the memory 
layout situation further when I get back from holiday, in a couple of 
weeks.

N