Number of Processors/Cores in Command Line

Find Number of CPUs and Cores per CPU using Command Prompt

Based upon your comments - your path statement has been changed/is incorrect or the path variable is being incorrectly used for another purpose.

Number of processors/cores in command line

nproc is what you are looking for.

More here : http://www.cyberciti.biz/faq/linux-get-number-of-cpus-core-command/

How to obtain the number of CPUs/cores in Linux from the command line?

grep -c ^processor /proc/cpuinfo

will count the number of lines starting with "processor" in /proc/cpuinfo

For systems with hyper-threading, you can use

grep ^cpu\\scores /proc/cpuinfo | uniq |  awk '{print $4}'

which should return (for example) 8 (whereas the command above would return 16)

How can I get the number of CPU cores in Powershell?

Ran Turner's answer provides the crucial pointer, but can be improved in two ways:

• The CIM cmdlets (e.g., Get-CimInstance) superseded the WMI cmdlets (e.g., Get-WmiObject) in PowerShell v3 (released in September 2012). Therefore, the WMI cmdlets should be avoided, not least because PowerShell (Core) (v6+), where all future effort will go, doesn't even have them anymore. Note that WMI still underlies the CIM cmdlets, however. For more information, see this answer.

• Format-Table, as all Format-* cmdlets, is designed to produce for-display formatting, for the human observer, and not to output data suitable for later programmatic processing (see this answer for more information).

  • To instead create objects with a subset of the input objects' properties, use the Select-Object cmdlet. (If the output object(s) have 4 or fewer properties and aren't captured, they implicitly format as if Format-Table had been called; with 5 or more properties, it is implicit Format-List).

Therefore:

# Creates a [pscustomobject] instance with 
# .NumberOfCores and .NumberOfLogicalProcessors properties.
$cpuInfo =
  Get-CimInstance –ClassName Win32_Processor | 
     Select-Object -Property NumberOfCores, NumberOfLogicalProcessors

# Save the values of interest in distinct variables, using a multi-assignment.
# Of course, you can also use the property values directly.
$cpuPhysicalCount, $cpuLogicalCount = $cpuInfo.NumberOfCores, $cpuInfo.NumberOfLogicalProcessors

Of course, if you're only interested in the values (CPU counts as mere numbers), you don't need the intermediate object and can omit the Select-Object call above.

As for a one-liner:

If you want a one-liner that creates distinct variables, without repeating the - costly - Get-CimInstance call, you can use an aux. variable that takes advantage of PowerShell's ability to use assignments as expressions:

$cpuPhysicalCount, $cpuLogicalCount = ($cpuInfo = Get-CimInstance -ClassName Win32_Processor).NumberOfCores, $cpuInfo.NumberOfLogicalProcessors

• To save the numbers in distinct variables and output them (return them as a 2-element array), enclose the entire statement in (...).

• To only output the numbers, simply omit the $cpuPhysicalCount, $cpuLogicalCount = part.

How to get the number of physical and logical cores in a batch file?

To get a command's output, use a for /f loop:

for /f "delims=" %%a in ('"WMIC CPU Get NumberOfCores,NumberOfLogicalProcessors /value"') do set /a "_%%a"
set _

Parsing wmic output has some quirks (Unicode, strange line ending CRCRLF), and there are several methods to get the format you want. As here the values are purely numeric, I chose set /a. This won't work if the values are alphanumeric.

Attention:

NumberOfCores gives you the number of cores, not the number of physical processors. There are single- and multicore processors. The number of physical processors can be obtained with:

wmic COMPUTERSYSTEM get NumberOfProcessors,NumberOfLogicalProcessors

(please double-check, of NumberOfLogicalProcessors matches the value given by WMIC CPU. I don't have a multiprocessor system available to check)

Limit the number of CPU cores used by an Windows service running from net start command

I found a solution. First, you cannot set CPU affinity to Windows system processes or services (see https://www.atmarkit.co.jp/ait/articles/0703/16/news151.html (Japanese)).

In my situation, I can run PostgreSQL process from pg_ctl command from cmd.exe with /affinity option like:

cmd.exe /c "start /affinity 1F /B c:\path\to\PostgreSQL\12\bin\pg_ctl.exe start -w -s -D C:\path\to\PostgreSQL\12\data"

Note that you cannot use Start-Process cmdlet and ProcessorAffinity property like this:

$app = Start-Process 'c:\path\to\PostgreSQL\12\bin\pg_ctl.exe' 'start -D C:\path\to\PostgreSQL\12\data' -PassThru -NoNewWindow
$app.ProcessorAffinity = 0x3

This causes SetValueInvocationException because pg_ctl.exe is immediately exit after it starts PostgreSQL instance.

Trying to get number of cores remotely

The number of cores is part of the CPU, not the OS.

C:\>wmic /NODE:localhost cpu get NumberOfCores, NumberOfLogicalProcessors
NumberOfCores  NumberOfLogicalProcessors
4              8

When you are ready to step up to PowerShell.

PS C:\> Get-WmiObject Win32_Processor | Select-Object -Property NumberOfCores

NumberOfCores
-------------
            4

Or, from withing a cmd .bat script.

C:\>powershell -NoProfile -Command "& { Get-WmiObject Win32_Processor | Select-Object -Property NumberOfCores }"

NumberOfCores
-------------
            4

In MS Access VBA get Number of Processor Cores

Why not keep it simple like this:

Dim result As Variant
result = Environ("NUMBER_OF_PROCESSORS")
Debug.Print "Number of processors is " & result

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