04-23-2010
Quote:
Originally Posted by
snjksh
1) Can any one tell me why the load average is so high though the cpu utilization is 85%.
Because there are some short periods of time where the run queue is empty and all threads are waiting for something to happen while there are more other periods of time when plenty of threads want a CPU but none is available. To know if this is an issue, you should tell how many CPUs/Cores/Chip Threads are available on your machine.
Quote:
2) what is lwps and is it harmfull for the system
lwps are light weight processes a.k.a threads. The number of lwps isn't harmful at all.
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
we have an unix system which has
load average normally about 20.
but while i am running a particular unix batch which performs heavy
operations on filesystem and database average load
reduces to 15.
how can we explain this situation?
while running that batch idle cpu time is about %60-65... (0 Replies)
Discussion started by: gfhgfnhhn
0 Replies
2. UNIX for Dummies Questions & Answers
Hello all, I have a question about load averages.
I've read the man pages for the uptime and w command for two or three different flavors of Unix (Red Hat, Tru64, Solaris). All of them agree that in the output of the 2 aforementioned commands, you are given the load average for the box, but... (3 Replies)
Discussion started by: Heathe_Kyle
3 Replies
3. Shell Programming and Scripting
Hi,
I'm new to shell scripting. I need to make a script to add on to my cronjobs.
The script must get the value of load average from my server and if its greater than 10 it should stop my apache service. I cant find a way to get the value of load average in integer type to do the check. Any... (4 Replies)
Discussion started by: jibsonline
4 Replies
4. UNIX for Dummies Questions & Answers
Hello, Here is the output of top command. My understanding here is,
the load average 0.03 in last 1 min, 0.02 is in last 5 min, 0.00 is in last 15 min.
By seeing this load average, When can we say that, the system load averge is too high?
When can we say that, load average is medium/low??... (8 Replies)
Discussion started by: govindts
8 Replies
5. Solaris
Hi,
i have installed solaris 10 on t-5120 sparc enterprise.
I am little surprised to see load average of 2 or around on this OS.
when checked with ps command following process is using highest CPU. looks like it is running for long time and does not want to stop, but I do not know... (5 Replies)
Discussion started by: upengan78
5 Replies
6. UNIX for Dummies Questions & Answers
Hello AlL,..
I want from experts to help me as my load average is increased and i dont know where is the problem !!
this is my top result :
root@a4s # top
top - 11:30:38 up 40 min, 1 user, load average: 3.06, 2.49, 4.66
Mem: 8168788k total, 2889596k used, 5279192k free, 47792k... (3 Replies)
Discussion started by: black-code
3 Replies
7. UNIX for Dummies Questions & Answers
What should be the threshold for load average of a quad core processor? What constitutes "good" and "bad" load average values? (2 Replies)
Discussion started by: proactiveaditya
2 Replies
8. UNIX for Advanced & Expert Users
Hi ,
I am using 48 CPU sunOS server at my work.
The application has facility to check the current load average before starting a new process to control the load.
Right now it is configured as 48. So it does mean that each CPU can take maximum one proces and no processe is waiting.
... (2 Replies)
Discussion started by: kumaran_5555
2 Replies
9. UNIX for Dummies Questions & Answers
how load average is calculated and what exactly is it
difference between cpu% and load average (9 Replies)
Discussion started by: robo
9 Replies
10. HP-UX
Hi,
On load average graph, unit is 100m, 200m, 300...800m.
I don't understand what it means.
Thx for helping (3 Replies)
Discussion started by: Michenux
3 Replies
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)