[root@UQ]# psrinfo |head 0 on-line since 01/16/2014 11:37:31 1 on-line since 01/16/2014 11:38:46 2 on-line since 01/16/2014 11:38:46 3 on-line since 01/16/2014 11:38:46 4 on-line since 01/16/2014 11:38:46 5 on-line since 01/16/2014 11:38:46 6 on-line since 01/16/2014 11:38:46 7 on-line since 01/16/2014 11:38:46 8 on-line since 01/16/2014 11:38:46 9 on-line since 01/16/2014 11:38:46 [root@UQ]# psrinfo |tail 54 on-line since 01/16/2014 11:38:46 55 on-line since 01/16/2014 11:38:46 56 on-line since 01/16/2014 11:38:46 57 on-line since 01/16/2014 11:38:46 58 on-line since 01/16/2014 11:38:46 59 on-line since 01/16/2014 11:38:46 60 on-line since 01/16/2014 11:38:46 61 on-line since 01/16/2014 11:38:46 62 on-line since 01/16/2014 11:38:46 63 on-line since 01/16/2014 11:38:46 [root@UQ~]#
2.To see the installed number of physical processors.
[root@UQ]# psrinfo -p 8 [root@UQ]#
3.To see the detailed information about the physical processor,
[root@UQ]# psrinfo -pv The physical processor has 8 virtual processors (0-7) SPARC64-VII (portid 1124 impl 0x7 ver 0xa1 clock xxxx MHz) The physical processor has 8 virtual processors (8-15) SPARC64-VII (portid 1132 impl 0x7 ver 0xa1 clock xxxx MHz) The physical processor has 8 virtual processors (16-23) SPARC64-VII (portid 1140 impl 0x7 ver 0xa1 clock xxxx MHz) The physical processor has 8 virtual processors (24-31) SPARC64-VII (portid 1148 impl 0x7 ver 0xa1 clock xxxx MHz) The physical processor has 8 virtual processors (32-39) SPARC64-VII (portid 1156 impl 0x7 ver 0xa1 clock xxxx MHz) The physical processor has 8 virtual processors (40-47) SPARC64-VII (portid 1164 impl 0x7 ver 0xa1 clock xxxx MHz) The physical processor has 8 virtual processors (48-55) SPARC64-VII (portid 1172 impl 0x7 ver 0xa1 clock xxxx MHz) The physical processor has 8 virtual processors (56-63) SPARC64-VII (portid 1180 impl 0x7 ver 0xa1 clock xxxx MHz) [root@UQ]#
4.We can also get the CPU information from prtdiag on SPARC systems.But X86 doesn’t offer this facility .
==================================== CPUs ====================================
CPU CPU Run L2$ CPU CPU
LSB Chip ID MHz MB Impl. Mask
--- ---- ---------------------------------------- ---- --- ----- ----
00 0 0, 1, 2, 3, 4, 5, 6, 7 xxxx x.x 7 961
00 1 8, 9, 10, 11, 12, 13, 14, 15 xxxx x.x 7 961
00 2 16, 17, 18, 19, 20, 21, 22, 23 xxxx x.x 7 961
00 3 24, 25, 26, 27, 28, 29, 30, 31 xxxx x.x 7 961
01 0 32, 33, 34, 35, 36, 37, 38, 39 xxxx x.x 7 961
01 1 40, 41, 42, 43, 44, 45, 46, 47 xxxx x.x 7 961
01 2 48, 49, 50, 51, 52, 53, 54, 55 xxxx x.x 7 961
01 3 56, 57, 58, 59, 60, 61, 62, 63 xxxx x.x 7 961
From the above output, you can see CPU chip 0 has cores from 0 to 7(CPU ID). Which means CPU 0 has 8 cores. Here we have 8 physical processor and each has 8 cores. Total number of cpu core is 64 on this system.
5.For Solaris 8 and Solaris 9, we have psrinfo command but some options will not work unlike solaris 10 and 11.
For example,
There is no option like “-p” on solaris 8 and Solaris 9.
# psrinfo
0 on-line since 04/10/12 20:29:47
1 on-line since 04/10/12 20:29:46
# psrinfo -pv
psrinfo: illegal option -- p
usage:
psrinfo [-v] [processor_id ...]
psrinfo -s processor_id
#
In prtdiag also , we can’t see the cpu cores on solaris 8 and 9.
==================================== CPUs ====================================
E$ CPU CPU Temperature Fan
CPU Freq Size Impl. Mask Die Ambient Speed Unit
--- -------- ---------- ------ ---- -------- -------- ----- ----
MB/P0 1002 MHz 1MB US-IIIi 2.4 - -
MB/P1 1002 MHz 1MB US-IIIi 2.4 - -
6. How to disable the CPU core ?
To disable the CPU, you need to use “/usr/sbin/psradm” command. For an exmple,If you want to disable cpu id 9, then use the below command.
# /usr/sbin/psradm -f 9
option -f used to disable the cpu core.
7.How to enable the CPU core ?
Use -n option to enable the disable the cpu cores.
# psradm -n 0
8.To disable the multiple cpu cores ,
# /usr/sbin/psradm -f 9 10 11 12 13
9.To enable the multiple cpu cores,
# /usr/sbin/psradm -n 9 10 11 12 13
10.How to offline the processor forcefully ? you need to use -F option to do that.
# psradm -F -f 19 20
11.How to set the processor as spare using psradm command.?
The below example will make the cpu core 11 and 12 as spare processor.
# psradm -s 11 12
12.How to make the processor as spare forcefully even its in faulted state ?
# psradm -F -s 11 12
Hope this articles is useful for Solaris beginners.
For T series servers , you won’t get the processor core information in “psrinfo -pv” command. You need to calculate the number cores using kstat command.
1.Execute the below command to get the one core id and processor id.
[root@T5440-UA ~]# /usr/bin/kstat -m cpu_info |egrep "chip_id|core_id" |more
chip_id 0
core_id 1026
chip_id 0
core_id 1026
chip_id 0
core_id 1026
chip_id 0
core_id 1026
chip_id 0
core_id 1026
chip_id 0
core_id 1026
chip_id 0
core_id 1026
chip_id 0
core_id 1026
chip_id 0
core_id 1033
chip_id 0
core_id 1033
chip_id 0
core_id 1033
chip_id 0
core_id 1033
chip_id 0
core_id 1033
chip_id 0
core_id 1033
chip_id 0
core_id 1033
chip_id 0
core_id 1033
chip_id 0
core_id 1040
chip_id 0
core_id 1040
chip_id 0
core_id 1040
chip_id 0
[root@T5440-UA ~]#
2.Just find how many threads on single core.
[root@T5440-UA ~]# /usr/bin/kstat -m cpu_info |egrep "chip_id|core_id" |grep 1026|wc -l
8
[root@T5440-UA ~]#
As per the above output,core_id 1026 is having 8 threads.
3.Check the total number of threads per physical cpu. chip_id = 0
[root@T5440-UA ~]# /usr/bin/kstat -m cpu_info |egrep "chip_id|core_id" |grep "chip_id 0" |wc -l
64
[root@T5440-UA ~]#
Physical CPU (chip_id 0 ) has 64 threads.
4.To get the number of cores per cpu,use the below formula.
Number of core per cpu = Total number of thread per cpu/Total number of threads per core.
[root@T5440-UA ~]# bc 64/8 8 [root@T5440-UA ~]#
In this machine, each core is having 8 threads and per CPU , it has 8 cores. So the total number of virtual processor is 64 per processor.
Thank you for visiting UnixArena.
Satish Ganta says
Thanks for your knowledge sharing Lingesh…
Mohamed Musthak says
Hi lingesh,
Is it possible to disable the cores?
For example my t4 is having 1 physical cpu with 8 cores and I would like to disable 4 cores from the total of 8 cores
Krishna Mohan Ch says
Hi lingeswar please post any real time issues