Re: squatter exits with "fatal error: Virtual memory exhausted" on huge mailbox

[Sebastian Hagedorn <Hagedorn@xxxxxxxxxxxx>]

--On 13. Juli 2009 15:36:07 +0200 Gabor Gombas <gombasg@xxxxxxxxx> wrote:

> On Mon, Jul 13, 2009 at 02:09:40PM +0200, Sebastian Hagedorn wrote:
>
> > > 4 GB limit of 32 bit binaries?
> >
> > Perhaps, although I haven't seen it.
>
> That's only 3GB by default, 1GB of address space is reserved for the
> kernel. Also, the stack, the executable, and all the shared libraries
> the executable uses also occupy some address space.

Good to know.

> > Of course it's possible that it then tried to allocate one huge
> > chunk, but I can't see that. Are there better tools to monitor the
> > memory allocation of a process?
>
> strace -e trace=brk,mmap,munmap (well, this actually traces glibc's
> memory management, but it should show the failure).

You. I had to specify mmap2, but then I see this:

mmap2(NULL, 267374592, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 
0) = 0x2218b000
mmap2(NULL, 858675, PROT_READ, MAP_SHARED, 43, 0) = 0x220b9000
munmap(0x220b9000, 858675)              = 0
munmap(0x2218b000, 267374592)           = 0
mmap2(NULL, 682827776, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 
0) = -1 ENOMEM (Cannot allocate memory)
brk(0)                                  = 0x993d000
brk(0x32483000)                         = 0x993d000
mmap2(NULL, 682962944, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 
0) = -1 ENOMEM (Cannot allocate memory)
mmap2(NULL, 2097152, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, 
-1, 0) = 0x337c1000
munmap(0x337c1000, 258048)              = 0
munmap(0x33900000, 790528)              = 0
mmap2(NULL, 682827776, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 
0) = -1 ENOMEM (Cannot allocate memory)
fatal error: Virtual memory exhausted

So it really tries to allocate a rather large chunk! I guess that's one 
more reason to switch to 64-bit when we make he move to RHEL 5.

Thanks!
--
    .:.Sebastian Hagedorn - RZKR-R1 (Gebäude 52), Zimmer 18.:.
                .:.Regionales Rechenzentrum (RRZK).:.
.:.Universität zu Köln / Cologne University - ✆ +49-221-478-5587.:.

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