It should be easy to find this information just by running an OS
command. However for some reason it ain't the case as of today. The user
must know few details about the underlying hardware and run multiple
commands to figure out the exact number of physical processors, cores
etc.,
For the benefit of our customers, here is a simple shell script that
displays the number of physical processors, cores, virtual processors,
cores per physical processor, number of hardware threads (vCPUs) per
core and the virtual CPU mapping for all physical processors and cores
on a Solaris system (SPARC or x86/x64).
This script showed valid output
on recent T-series, M-series hardware as well as on some older hardware -
Sun Fire 4800, x4600. Due to the changes in the output of
cpu_info
over the years, it is possible that the script may return incorrect
information in some cases. Since it is just a shell script, tweak the
code as you like. The script can be executed by any OS user.
# vi /root/showcpucount.sh
--------------------------------------- CUT HERE -------------------------------------------
#!/bin/bash
/usr/bin/kstat -m cpu_info | egrep "chip_id|core_id|module: cpu_info" > /var/tmp/cpu_info.log
nproc=`(grep chip_id /var/tmp/cpu_info.log | awk '{ print $2 }' | sort -u | wc -l | tr -d ' ')`
ncore=`(grep core_id /var/tmp/cpu_info.log | awk '{ print $2 }' | sort -u | wc -l | tr -d ' ')`
vproc=`(grep 'module: cpu_info' /var/tmp/cpu_info.log | awk '{ print $4 }' | sort -u | wc -l | tr -d ' ')`
nstrandspercore=$(($vproc/$ncore))
ncoresperproc=$(($ncore/$nproc))
speedinmhz=`(/usr/bin/kstat -m cpu_info | grep clock_MHz | awk '{ print $2 }' | sort -u)`
speedinghz=`echo "scale=2; $speedinmhz/1000" | bc`
echo "Total number of physical processors: $nproc"
echo "Number of virtual processors: $vproc"
echo "Total number of cores: $ncore"
echo "Number of cores per physical processor: $ncoresperproc"
echo "Number of hardware threads (strands or vCPUs) per core: $nstrandspercore"
echo "Processor speed: $speedinmhz MHz ($speedinghz GHz)"
# now derive the vcpu-to-core mapping based on above information #
echo -e "\n** Socket-Core-vCPU mapping **"
let linenum=2
for ((i = 1; i <= ${nproc}; ++i ))
do
chipid=`sed -n ${linenum}p /var/tmp/cpu_info.log | awk '{ print $2 }'`
echo -e "\nPhysical Processor $i (chip id: $chipid):"
for ((j = 1; j <= ${ncoresperproc}; ++j ))
do
let linenum=($linenum + 1)
coreid=`sed -n ${linenum}p /var/tmp/cpu_info.log | awk '{ print $2 }'`
echo -e "\tCore $j (core id: $coreid):"
let linenum=($linenum - 2)
vcpustart=`sed -n ${linenum}p /var/tmp/cpu_info.log | awk '{ print $4 }'`
let linenum=(3 * $nstrandspercore + $linenum - 3)
vcpuend=`sed -n ${linenum}p /var/tmp/cpu_info.log | awk '{ print $4 }'`
echo -e "\t\tvCPU ids: $vcpustart - $vcpuend"
let linenum=($linenum + 4)
done
done
rm /var/tmp/cpu_info.log
--------------------------------------- CUT HERE -------------------------------------------
# prtdiag | head -1
System Configuration: Sun Microsystems sun4u SPARC Enterprise M4000 Server
# ./showcpucount
Total number of physical processors: 4
Number of virtual processors: 32
Total number of cores: 16
Number of cores per physical processor: 4
Number of hardware threads (strands or vCPUs) per core: 2
Processor speed: 2660 MHz (2.66 GHz)
** Socket-Core-vCPU mapping **
Physical Processor 1 (chip id: 1024):
Core 1 (core id: 0):
vCPU ids: 0 - 1
Core 2 (core id: 2):
vCPU ids: 2 - 3
Core 3 (core id: 4):
vCPU ids: 4 - 5
Core 4 (core id: 6):
vCPU ids: 6 - 7
Physical Processor 2 (chip id: 1032):
Core 1 (core id: 8):
vCPU ids: 8 - 9
Core 2 (core id: 10):
vCPU ids: 10 - 11
Core 3 (core id: 12):
vCPU ids: 12 - 13
Core 4 (core id: 14):
vCPU ids: 14 - 15
Physical Processor 3 (chip id: 1040):
Core 1 (core id: 16):
vCPU ids: 16 - 17
Core 2 (core id: 18):
vCPU ids: 18 - 19
Core 3 (core id: 20):
vCPU ids: 20 - 21
Core 4 (core id: 22):
vCPU ids: 22 - 23
Physical Processor 4 (chip id: 1048):
Core 1 (core id: 24):
vCPU ids: 24 - 25
Core 2 (core id: 26):
vCPU ids: 26 - 27
Core 3 (core id: 28):
vCPU ids: 28 - 29
Core 4 (core id: 30):
vCPU ids: 30 - 31
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