MEMHOG

NAME

memhog - Allocates memory with policy for testing

SYNOPSIS

memhog [ -r<NUM> ] [ size kmg ] [ policy nodeset ] [ -f<filename> ]

DESCRIPTION

memhog mmaps a memory region for a given size and sets the numa policy (if specified). It then updates the memory region for the given number of iterations using memset.

Supported numa-policies:
interleave

Memory will be allocated using round robin on nodes. When memory cannot be allocated on the current interleave, target fall back to other nodes. Multiple nodes may be specified.

membind

Only allocate memory from nodes. Allocation will fail when there is not enough memory available on these nodes. Multiple nodes may be specified.

preferred

Preferably allocate memory on node, but if memory cannot be allocated there fall back to other nodes. This option takes only a single node number.

default

Memory will be allocated on the local node (the node the thread is running on)

EXAMPLES

# Allocate a 1G region, mmap backed by memhog.mmap file, membind to node 0,
repeat test 6 times

memhog -r6 1G --membind 0 -fmemhog.mmap

# Allocate a 1G region, iterleave across nodes 0,1,2,3, repeat test 4 times

memhog -r4 1G --interleave 0-3

# Allocate a 1G region, (implicit) default policy, repeat test 8 times

memhog -r8 1G

AUTHORS

Andi Kleen (ak@suse.de)

LICENSE

GPL v2

SEE ALSO

mmap(2), memset(3), numactl(8), numastat(8)