Nice=
Sets the default nice level (scheduling priority) for
executed processes. Takes an integer between -20 (highest
priority) and 19 (lowest priority). In case of resource
contention, smaller values mean more resources will be made
available to the unit's processes, larger values mean less
resources will be made available. See setpriority(2) for
details.
CPUSchedulingPolicy=
Sets the CPU scheduling policy for executed processes. Takes
one of other, batch, idle, fifo or rr. See
sched_setscheduler(2) for details.
CPUSchedulingPriority=
Sets the CPU scheduling priority for executed processes. The
available priority range depends on the selected CPU
scheduling policy (see above). For real-time scheduling
policies an integer between 1 (lowest priority) and 99
(highest priority) can be used. In case of CPU resource
contention, smaller values mean less CPU time is made
available to the service, larger values mean more. See
sched_setscheduler(2) for details.
CPUSchedulingResetOnFork=
Takes a boolean argument. If true, elevated CPU scheduling
priorities and policies will be reset when the executed
processes call fork(2), and can hence not leak into child
processes. See sched_setscheduler(2) for details. Defaults to
false.
CPUAffinity=
Controls the CPU affinity of the executed processes. Takes a
list of CPU indices or ranges separated by either whitespace
or commas. Alternatively, takes a special "numa" value in
which case systemd automatically derives allowed CPU range
based on the value of NUMAMask= option. CPU ranges are
specified by the lower and upper CPU indices separated by a
dash. This option may be specified more than once, in which
case the specified CPU affinity masks are merged. If the
empty string is assigned, the mask is reset, all assignments
prior to this will have no effect. See sched_setaffinity(2)
for details.
NUMAPolicy=
Controls the NUMA memory policy of the executed processes.
Takes a policy type, one of: default, preferred, bind,
interleave and local. A list of NUMA nodes that should be
associated with the policy must be specified in NUMAMask=.
For more details on each policy please see, set_mempolicy(2).
For overall overview of NUMA support in Linux see, numa(7).
NUMAMask=
Controls the NUMA node list which will be applied alongside
with selected NUMA policy. Takes a list of NUMA nodes and has
the same syntax as a list of CPUs for CPUAffinity= option or
special "all" value which will include all available NUMA
nodes in the mask. Note that the list of NUMA nodes is not
required for default and local policies and for preferred
policy we expect a single NUMA node.
IOSchedulingClass=
Sets the I/O scheduling class for executed processes. Takes
an integer between 0 and 3 or one of the strings none,
realtime, best-effort or idle. If the empty string is
assigned to this option, all prior assignments to both
IOSchedulingClass= and IOSchedulingPriority= have no effect.
See ioprio_set(2) for details.
IOSchedulingPriority=
Sets the I/O scheduling priority for executed processes.
Takes an integer between 0 (highest priority) and 7 (lowest
priority). In case of I/O contention, smaller values mean
more I/O bandwidth is made available to the unit's processes,
larger values mean less bandwidth. The available priorities
depend on the selected I/O scheduling class (see above). If
the empty string is assigned to this option, all prior
assignments to both IOSchedulingClass= and
IOSchedulingPriority= have no effect. See ioprio_set(2) for
details.
