We often get questions on how to check physical RAM, swap space on Unix. Command varies as per the Operating system. Here are the commands for the common operating system
How to check Physical RAM , Swap Space on Unix
Operating System: HP Tru64 UNIX
Physical RAM: # /bin/vmstat -P grep “Total Physical Memory”
Swap Space: # /sbin/swapon -s
Operating System: HP-UX Itanium
Physical RAM: # /usr/contrib/bin/machinfo grep -i Memory
Swap Space: # /usr/sbin/swapinfo -a
Operating System: HP-UX PA-RISC (64-Bit)
Physical RAM: # grep “Physical:” /var/adm/syslog/syslog.log
Swap Space: # /usr/sbin/swapinfo -a
Operating System: IBM zSeries Based Linux, LinuxItanium/POWER/x86/x86-64
Physical RAM: # grep MemTotal /proc/meminfo
Swap Space: # grep SwapTotal /proc/meminfo
grep MemTotal /proc/meminfo MemTotal: 4051792 kB
Operating System: Solaris SPARC 64-Bit/x86/x86-64
Physical RAM: # /usr/sbin/prtconf grep “Memory size”
Swap Space: # /usr/sbin/swap -s
/usr/sbin/prtconf | grep "Memory size" Memory size: 65536 Megabytes
How to check CPU
For Solaris Operating system. Some commands may not work on all version
/usr/platform/sun4u/sbin/prtdiag -v
If you just want information on the CPU you can also try:
To see the installed number of physical processors.
psrinfo -p
To see the detailed information about the physical processor,
psrinfo -pv
To see the detailed information about the virtual processor,
psrinfo -v
Another way
uname -X
For the Solaris T4/T5 system, we can use the below command to find all the details about the CPU
#!/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
For the Linux Operating system
$ more /proc/cpuinfo
OR
$ cat /proc/cpuinfo
OR
$ less /proc/cpuinfo
For the AIX operating system
lparstat -i | grep CPU
Online Virtual CPUs : 2
Maximum Virtual CPUs : 15
Minimum Virtual CPUs : 1
Maximum Physical CPUs in system : 2
Active Physical CPUs in system : 2
Active CPUs in Pool : 2
Physical CPU Percentage : 25.00%
mpstat /vmstats and get both the entitled capacity and logical/virtual CPU on the box
I have tried to present a lot of information on how to check physical RAM, and swap space on Unix but it is not complete. I hope these are useful for the users
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If statement in Shell Scripts
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awk command in Unix
