Hi!
I tried to mmap 16GB of memory (MAP_ANONYMOUS) for my program which
runs on amd64 ubuntu jaunty. However as long as I mmap more that 8GB,
it fails with ENOMEM
if ((buf = mmap(NULL, (size_t)1024 * 1024 * 1024 * 16, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, -1, 0)) == MAP_FAILED) {
perror("mmap()");
abort();
}
The machine happens to have 4GB of physical memory installed
but ulimit shows no limit on max memory:
$ ulimit -a
core file size (blocks, -c) 100000
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 38912
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 38912
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
What is the limit of MAP_ANONYMOUS? Can we increase the limit?
Thanks!
Mark
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