1memavaild(8)          Linux System Administrator's Manual         memavaild(8)
2
3
4

NAME

6       memavaild - Daemon that keeps amount of available memory
7

SYNOPSIS

9       memavaild [OPTION]...
10

DESCRIPTION

12       memavaild  is a daemon that tries to keep amount of available memory to
13       improve system responsiveness during heavy swapping.
14
15       Default behavior: the control  groups  specified  in  the  config  (us‐
16       er.slice  and system.slice) are swapped out when MemAvailable is low by
17       reducing memory.high (values change dynamically).  memavaild  tries  to
18       keep about 3% available memory.
19
20       Effects:  tasks are performed at less I/O and memory pressure (and this
21       may be detected by PSI metrics).  At the same time, performance may  be
22       increased  in  tasks  that  requires  heavy swapping, especially in I/O
23       bound tasks.  Using memavaild has no effect without swap space.
24

COMMAND-LINE OPTIONS

26   -c CONFIG
27       path to the config file
28

REQUIREMENTS

30       · Python (>= 3.3)
31
32       · systemd with unified cgroup hierarchy
33

Known problems

35       · The documentation is terrible (no config keys description, for  exam‐
36         ple);
37
38       · The ZFS ARC cache is memory-reclaimable, like the Linux buffer cache.
39         However, in contrast to the buffer cache, it currently does not count
40         to  MemAvailable (see <https://github.com/openzfs/zfs/issues/10255>).
41         Don't use memavaild with ZFS;
42
43       · Seems  like  memavaild  violates  the   second   rule   (https://sys‐
44         temd.io/CGROUP_DELEGATION/):  memavaild manipulates the attributes of
45         cgroups created by systemd (memavaild changes memory.high values).
46

FILES

48   /etc/memavaild.conf
49       path to configuration file
50
51   /usr/share/memavaild/memavaild.conf
52       path to file with default memavaild.conf values
53

RESTORE DEFAULT CONFIG

55       To resore config file with default values execute
56
57              sudo cp /usr/share/memavaild/memavaild.conf /etc/memavaild.conf
58

HOW TO CONFIGURE

60       Edit the config and restart the service.
61

REPORTING BUGS

63       Feel   free   to   ask   any   questions    and    report    bugs    at
64       <https://github.com/hakavlad/memavaild/issues>.
65

AUTHOR

67       Written by Alexey Avramov <hakavlad@gmail.com>.
68

HOMEPAGE

70       Homepage is <https://github.com/hakavlad/memavaild>.
71
72
73
74                                                                  memavaild(8)