|
|
Sponsored Content
Operating Systems
AIX
LPAR CPU capacity planning
Post 302804371 by MichaelFelt on Wednesday 8th of May 2013 12:54:35 PM
05-08-2013
lbusy gives you the relative number of "logical" cpus busy. Since you are smt4 your have 96/4 virtual processors - 24 virtual (i.e. maximum physical processors at any moment).
Since your entitlement is 16 - the PHYP has reserved (declared as Home) two sockets of 8 cores each. The 8 extra virtual processors will run, ideally, on these home processors.
16 entitlement == 160 msec processing power every 10 msec guaranteed.
phsyc * 10 = # msec actually used (not processors!)
lbusy * 96 = average number of threads busy; if this number is nearly equal to physc, then you are running, mainly, single-threaded and you could easily reduce the number of VP assigned (to 'force' more utilization from a single processor (i.e., lbusy goes up faster than physc).
Hope this helps (I have to run to dinner
)
Since your entitlement is 16 - the PHYP has reserved (declared as Home) two sockets of 8 cores each. The 8 extra virtual processors will run, ideally, on these home processors.
16 entitlement == 160 msec processing power every 10 msec guaranteed.
phsyc * 10 = # msec actually used (not processors!)
lbusy * 96 = average number of threads busy; if this number is nearly equal to physc, then you are running, mainly, single-threaded and you could easily reduce the number of VP assigned (to 'force' more utilization from a single processor (i.e., lbusy goes up faster than physc).
Hope this helps (I have to run to dinner
)|
|
7 More Discussions You Might Find Interesting
1. Solaris
Dear All,
We are going for Disaster Recovery project, the vendor asked for more details about how much is the daily data changes only. using sar / iostat can any one help me to collect this ?!
Note: only I need the changed data size not the daily increasing data. this is to know how much... (1 Reply)
Discussion started by: adel8483
1 Replies
2. What is on Your Mind?
Hi,
I got 2 courses Intermediate and advanced Solaris 10 Administration before 1 month.
I was studying the material of the 1st course I will finish it soon. I want to get the Exam. What is your advice?
Which is the best Exam Quastion ( Testking or ,,,,,,,, Etc) ....
Regards (1 Reply)
Discussion started by: adel8483
1 Replies
3. AIX
Hi All,
What do you usually use for capacity planning on AIX?
Any idea will do?
Thanks in advance,
itik (1 Reply)
Discussion started by: itik
1 Replies
4. Solaris
Hi All,
What do you usually use for capacity planning tool on solaris 8 or later?
Thanks in advance. (2 Replies)
Discussion started by: itik
2 Replies
5. AIX
Hi all,
I have the following configuration
2 ds3524 storage disk systems located over 2 locations
2 P720 server located over 2 locations
DS3524 are connected to san switch.
Each vio server has 1 fc adapter attached to a san switch.
per p720 server 2 virtual io servers. Vio 1 has 1 lun... (2 Replies)
Discussion started by: markiemark
2 Replies
6. AIX
There can be configurations in IBM Server wherein a
standalone partition is created on some supported IBM Server
Or
A VIOS - VIOC LPARs created.
Now in both cases they are lpars. But if I want to differentiate b/w a standalone LPAR vs an VIOC LPAR how can I do..?
On a... (2 Replies)
Discussion started by: Manish00712
2 Replies
7. AIX
can anyone tell me how to reduce Fs capacity by using echo zero. (3 Replies)
Discussion started by: nkchand
3 Replies
LEARN ABOUT LINUX
chcpu
CHCPU(8) System Administration CHCPU(8) NAME
chcpu - configure CPUs SYNOPSIS
chcpu -c|-d|-e|-g cpu-list chcpu -p mode chcpu -r|-h|-V DESCRIPTION
chcpu can modify the state of CPUs. It can enable or disable CPUs, scan for new CPUs, change the CPU dispatching mode of the underlying hypervisor, and request CPUs from the hypervisor (configure) or return CPUs to the hypervisor (deconfigure). Some options have a cpu-list argument. Use this argument to specify a comma-separated list of CPUs. The list can contain individual CPU addresses or ranges of addresses. For example, 0,5,7,9-11 makes the command applicable to the CPUs with the addresses 0, 5, 7, 9, 10, and 11. OPTIONS
-c, --configure cpu-list Configure the specified CPUs. Configuring a CPU means that the hypervisor takes a CPU from the CPU pool and assigns it to the vir- tual hardware on which your kernel runs. -d, --disable cpu-list Disable the specified CPUs. Disabling a CPU means that the kernel sets it offline. -e, --enable cpu-list Enable the specified CPUs. Enabling a CPU means that the kernel sets it online. A CPU must be configured, see -c, before it can be enabled. -g, --deconfigure cpu-list Deconfigure the specified CPUs. Deconfiguring a CPU means that the hypervisor removes the CPU from the virtual hardware on which the Linux instance runs and returns it to the CPU pool. A CPU must be offline, see -d, before it can be deconfigured. -p, --dispatch mode Set the CPU dispatching mode (polarization). This option has an effect only if your hardware architecture and hypervisor support CPU polarization. Available modes are: horizontal The workload is spread across all available CPUs. vertical The workload is concentrated on few CPUs. -r, --rescan Trigger a rescan of CPUs. After a rescan, the Linux kernel recognizes the new CPUs. Use this option on systems that do not auto- matically detect newly attached CPUs. -V, --version Display version information and exit. -h, --help Display help text and exit. RETURN CODES
chcpu has the following return codes: 0 success 1 failure 64 partial success AUTHOR
Heiko Carstens <heiko.carstens@de.ibm.com> COPYRIGHT
Copyright IBM Corp. 2011 SEE ALSO
lscpu(1) AVAILABILITY
The chcpu command is part of the util-linux package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils /util-linux/>. util-linux July 2014 CHCPU(8)