09-26-2007
Problem in CPU usage
Hi all,
I have C++ program that is running on linux on an ARM processor. The program is sending voice to a specific ip. When i started the program, 2 threads are running and sending voice over ip. Each of the threads are at %0.2 CPU usage which is very normal. My problem is, CPU usage is increasing hour by hour. After 10 hours it becomes %45 CPU usage for each of the threads which is very high. Because of this, the voice in both threads slows down, too. If i close both threads, and start new ones without closing the program, they start from beginning at %0.2 CPU usage. Why could it be? Where should i look?
Thanks.
Gokay
Last edited by gokaytos; 09-26-2007 at 05:38 PM..
Reason: Spelling Correction
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TUNA(8) System Administration Utilities TUNA(8)
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. The 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 asso-
ciated 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 acrross those same CPUs.
tuna February 2010 TUNA(8)