memhog8
Allocates memory with policy for testing
Usage
memhog [-r<NUM>]
[size
kmg]
[policy
nodeset]
[-f<filename>]
Overview
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.
| -r<num> | Repeat memset NUM times |
| -f<file> | Open file for mmap backing |
| -H | Disable transparent hugepages |
| -size | Allocation size in bytes, may have case-insensitive order |
| suffix (G=gigabyte, M=megabyte, K=kilobyte) |
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, interleave 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 |
Releases
3 releases since Debian 12 (Bookworm); the text changed 1 time.