Check memory subsystem from user space.
Inspect available memory.
$ free -h
total used free shared buff/cache available Mem: 31Gi 29Gi 822Mi 1.0Mi 402Mi 841Mi Swap: 2.0Gi 487Mi 1.5Gi
Inspect memtester package.
$ apt info memtester
Package: memtester Version: 4.5.0-1 Priority: optional Section: universe/utils Origin: Ubuntu Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com> Original-Maintainer: Laszlo Boszormenyi (GCS) <gcs@debian.org> Bugs: https://bugs.launchpad.net/ubuntu/+filebug Installed-Size: 50.2 kB Depends: libc6 (>= 2.10) Homepage: http://pyropus.ca/software/memtester/ Download-Size: 16.8 kB APT-Manual-Installed: yes APT-Sources: http://pl.archive.ubuntu.com/ubuntu impish/universe amd64 Packages Description: Utility for testing the memory subsystem This is a userspace utility for testing the memory subsystem for faults. In comparison to memtest86 you do not need to reboot the computer to test for memory faults. . Memtester can also be told to test memory starting at a particular physical address.
Install memtester package.
$ sudo apt install memtester
Display usage information.
$ memtester --help
memtester version 4.5.0 (64-bit) Copyright (C) 2001-2020 Charles Cazabon. Licensed under the GNU General Public License version 2 (only). pagesize is 4096 pagesizemask is 0xfffffffffffff000 memtester: invalid option -- '-' Usage: memtester [-p physaddrbase [-d device]] <mem>[B|K|M|G] [loops]
Determine the amount free memory.
$ cat /proc/meminfo | grep MemFree
MemFree: 30800512 kB
Extract the amount free memory using machine-friendly way.
$ cat /proc/meminfo | grep Free | awk '/MemFree/ {print $2 $3}'
30790440kB
Execute the userspace utility for testing the memory subsystem three times using all available (free) memory.
$ /usr/bin/time --format "Execution time: %E" sudo memtester $(cat /proc/meminfo | grep Free | awk '/MemFree/ {print $2 $3}') 3
memtester version 4.5.0 (64-bit) Copyright (C) 2001-2020 Charles Cazabon. Licensed under the GNU General Public License version 2 (only). pagesize is 4096 pagesizemask is 0xfffffffffffff000 want 30026MB (31485300736 bytes) got 30026MB (31485300736 bytes), trying mlock ...locked. Loop 1/3: Stuck Address : ok Random Value : ok Compare XOR : ok Compare SUB : ok Compare MUL : ok Compare DIV : ok Compare OR : ok Compare AND : ok Sequential Increment: ok Solid Bits : ok Block Sequential : ok Checkerboard : ok Bit Spread : ok Bit Flip : ok Walking Ones : ok Walking Zeroes : ok 8-bit Writes : ok 16-bit Writes : ok Loop 2/3: Stuck Address : ok Random Value : ok Compare XOR : ok Compare SUB : ok Compare MUL : ok Compare DIV : ok Compare OR : ok Compare AND : ok Sequential Increment: ok Solid Bits : ok Block Sequential : ok Checkerboard : ok Bit Spread : ok Bit Flip : ok Walking Ones : ok Walking Zeroes : ok 8-bit Writes : ok 16-bit Writes : ok Loop 3/3: Stuck Address : ok Random Value : ok Compare XOR : ok Compare SUB : ok Compare MUL : ok Compare DIV : ok Compare OR : ok Compare AND : ok Sequential Increment: ok Solid Bits : ok Block Sequential : ok Checkerboard : ok Bit Spread : ok Bit Flip : ok Walking Ones : ok Walking Zeroes : ok 8-bit Writes : ok 16-bit Writes : ok Done. Execution time: 0:04.98
