NAME¶

tuna - program for tuning running processes

SYNOPSIS¶

tuna [OPTIONS]

DESCRIPTION¶

This manual page explains the tuna program. The program can be used to change the attributes of application and kernel threads. tuna can operate on IRQs by name or number, and tasks or threads by process ID or command-line. CPUs and sets of CPUs can be specified by CPU or socket number. IRQ names and process command-lines can include wildcards.

tuna can change scheduling policy, scheduler priority and processor affinity for processes and process threads. tuna can also change the processor affinity for interrupts. When tuna is invoked without any options it starts up in its graphical interface mode. This manual page explains only the command-line options for tuna

OPTIONS¶

tuna has both action options and modifier options. Modifier options must be specified on the command-line before the actions they are intended to modify. Any modifier option applies to following actions on the same command-line until it is over-ridden.

Actions

-h, --help

Print a list of options. tuna will exit after this action, ignoring the remainder of the command-line.

-g, --gui

Start the GUI. Actions that follow this on the command-line will be processed without waiting for the GUI to complete.

-a, --config_file_apply=profilename

Apply changes described in profile

-l, --config_file_list

List preloaded profiles

-i, --isolate

Move all threads away from CPU-LIST. Requires -c or -S.

-I, --include

Allow all threads to run on CPU-LIST. Requires -c or -S.

-m, --move

Move selected entities to CPU-LIST. Requires -c and either -t or -q.

-p, --priority=[POLICY:]RTPRIO

Set thread scheduler tunables: POLICY and RTPRIO. POLICY is one of OTHER, FIFO, RR, or BATCH. Requires -t.

-P, --show_threads

Show thread list.

-s, --save=FILENAME

Save kthreads sched tunables to FILENAME.

-v, --version

Show version

-W, --what_is

Provides help about selected entities. Requires -t.

-x, --spread

Spread selected entities over CPU-LIST. Requires at least one of -t or -q. The specified threads and IRQs are each assigned to one cpu in CPU-LIST.

Modifiers

-c, --cpus=CPU-LIST

CPU-LIST affected by commands. Requires a CPU number or a comma-separated list of CPU numbers.

-C, --affect_children

Operation will affect children threads.

-f, --filter

Disable display of selected CPUs in --gui. Requires -c

-G, --cgroup

Display the processes with the type of cgroups they are in. Requires -P

-K, --no_kthreads

Operations will not affect kernel threads.

-q, --irqs=IRQ-LIST

IRQ-LIST affected by commands. Requires an IRQ number or a comma-separated list of IRQ numbers.

-S, --sockets=CPU-SOCKET-LIST

CPU-SOCKET-LIST affected by commands. Requires a socket number or a comma-separated list of socket numbers.

-t, --threads=THREAD-LIST

THREAD-LIST affected by commands. Requires a thread number or thread name, or a comma-separated list of thread numbers and/or names. Thread names may contain wildcards. Be sure to quote or escape any wildcard specifications.

-U, --no_uthreads

Operations will not affect user threads.

USAGE EXAMPLES¶

If for instance the Ethernet NICs have multiple queues for both receive and transmit, each with its own IRQ, the Ethernet IRQs can be associated with a CPU socket:

tuna -S 2 -i -q 'eth*' -x

Move everything off the CPUs in socket 2, then spread the IRQs for the Ethernet devices across those same CPUs.