Any idea why this simple program (creating powershell session) taking so much memory (~150 MB)?

Question 1

I am fairly new to powershell programming. I am creating remote sessions to execute some commands programmatically. However its consuming so much memory (in the order of ~150 to 200 MB). ANd more sessions, its more memory.

Can you please help me figure out the issue?

What is the culprit?
How can i fix it?

Observations:
1. After executing CreateRunSpace command, its consuming around 3MB.

Someone faced the same issue with creating runspaces:

http://social.technet.microsoft.com/Forums/en-US/winserverpowershell/thread/69ccce9d-4696-4886-a5d0-5d2d2e1e4e6d

“Possible PowerShell Runspace Handle Leak”

Still investigating to find the answer though…

Removing pssession made the runspace to release the handles and fixed the memory leak. Its now toggling between ~30 to 40MB.

Thank you!

(FYI – referenced System.Management.Automation.dll)

    using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Management.Automation.Runspaces;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            int success = 0;
            int fails = 0;
            for (int i = 0; i < 50; i++)
            {
                Runspace rs = RunspaceFactory.CreateRunspace();
                //After this the memory will be incremented by ~3Mb in taskmanager
                rs.Open();
                using (Pipeline pl = rs.CreatePipeline())
                {
                    Command cmd = new Command("new-pssession");
                    pl.Commands.Add(cmd);
                    var retval = pl.Invoke();
                    if (retval.Count > 0)
                    {
                        success++;
                    }
                    else
                    {
                        fails++;
                    }
                    pl.Stop();
                }
                rs.Close();
                rs = null;
            }
            GC.Collect();

        }

    }
}

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Management.Automation.Runspaces;

namespace ConsoleApplication2

{

class Program

{

static void Main(string[] args)

{

int success = 0;

int fails = 0;

for (int i = 0; i < 50; i++)

{

Runspace rs = RunspaceFactory.CreateRunspace();

//After this the memory will be incremented by ~3Mb in taskmanager

rs.Open();

using (Pipeline pl = rs.CreatePipeline())

{

Command cmd = new Command("new-pssession");

pl.Commands.Add(cmd);

var retval = pl.Invoke();

if (retval.Count > 0)

{

success++;

}

else

{

fails++;

}

pl.Stop();

}

rs.Close();

rs = null;

}

GC.Collect();

}

Question 2

Looks like removing-pssession from the runspace released the memory handles and fixed the leak. Now its taking ~35MB.

int success = 0;
int fails = 0;
for (int i = 0; i < 50; i++)
{
    Runspace rs = RunspaceFactory.CreateRunspace();
    rs.Open();
    using (Pipeline pl = rs.CreatePipeline())
    {
        Command cmd = new Command("new-pssession");
        pl.Commands.Add(cmd);
        var retval = pl.Invoke();
        if (retval.Count > 0)
        {
            success++;
            PSSession Session = (PSSession)retval[0].BaseObject;
            using (Pipeline pl2 = rs.CreatePipeline())
            {
                Command cmd2 = new Command("remove-pssession");
                cmd2.Parameters.Add("Id", Session.Id);
                pl2.Commands.Add(cmd2);
                var retval2 = pl2.Invoke();
                pl2.Stop();
            }
        }
        else
        {
            fails++;
        }
        pl.Stop();
    }
    rs.Close();
    rs = null;
}

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int success = 0;

int fails = 0;

for (int i = 0; i < 50; i++)

{

Runspace rs = RunspaceFactory.CreateRunspace();

rs.Open();

using (Pipeline pl = rs.CreatePipeline())

{

Command cmd = new Command("new-pssession");

pl.Commands.Add(cmd);

var retval = pl.Invoke();

if (retval.Count > 0)

{

success++;

PSSession Session = (PSSession)retval[0].BaseObject;

using (Pipeline pl2 = rs.CreatePipeline())

{

Command cmd2 = new Command("remove-pssession");

cmd2.Parameters.Add("Id", Session.Id);

pl2.Commands.Add(cmd2);

var retval2 = pl2.Invoke();

pl2.Stop();

}

else

{

fails++;

}

pl.Stop();

}

rs.Close();

rs = null;

}

Any idea why this simple program (creating powershell session) taking so much memory (~150 MB)?

Question:

Still investigating to find the answer though…

Answer:

Source:

Any idea why this simple program (creating powershell session) taking so much memory (~150 MB)? by stackoverflow.com licensed under CC BY-SA | With most appropriate answer!

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