Re: apparent 4 GB memory limit for brk() in solaris 8 on some hardware...?

clsmyth@xxxxxxxxxxxxxxx wrote:

Folks,

Hi, I have never posted to a language group before so please excuse me
if this is inappropriate.


    It's not -- but it's closer to appropriate than some of
the nonsense that goes on around here, ergo ego te absolvo
if you'll say ten "Hail, Dennises" and give up undefined
behavior for a week.

[...] The process grows to about 4 GB in RAM and then spits
out an error like this:

malloc(33554440) failed
app_name is aborting because it can't get more than 3838 megabytes of
memory


<off-topic>

    I betcha I betcha I just betcha the program was compiled
and linked as a 32-bit application.  A 32-bit pointer can have
only 4G distinct values, and so can address only 4GB of memory
no matter how much the system may have available.  A 32-bit
process is therefore limited to an address of no more than
4GB -- and it turns out that your O/S (Solaris) claims a little
bit of that space for its own purposes.

    The cure -- well, there are two possible cures.  First, you
may be looking at a memory leak in the program that causes it
to grow without limit.  If so, you need to find and fix that
bug.  Second, the program may be all right but your problem size
may require more memory than 4GB-minus-a-sliver.  If so, you need
to rebuild the program as a 64-bit application; this will get
you a "modest increase" in the amount of memory you can handle ...

</off-topic>

    Good luck!

--
Eric Sosman
esosman@xxxxxxxxxxxxxxxxxxx
.

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