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Working set tuning - possible?

I need to control the amount of physical memory that my application uses. In fact, I need to establish an upper limit for the RAM used by application - I want that my application does not occupy more memory than I allow (even at cost of perfomance).

Are there some API/hacks/tricks to do that under Windows 95/98?
And what is the API/tool (like PView for NT) which can show me the amount of RAM used by my application under Windows 95/98?

I am aware of SetProcessWorkingSetSize, but it only works for NT (and even under NT I was not able to reach my goal: establishing a limit does not work, TaskManager shows that the application still uses more memory than I specified).

Regards,
Asker.
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asker
Asked:
asker
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1 Solution
 
askerAuthor Commented:
Adjusted points to 350
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sudhirbratCommented:
Youy can use Performance Data Helper (PDH) in NT to get all performance counters like Memory usage and CPU usage. The sample code to get momery usage is as follows.

#include "pdh.h"

static HQUERY            hQuery                        = NULL;
static HCOUNTER            hMemCounter;


int InitCounter()
{
        PDH_STATUS      pdhStatus;
      CHAR            CounterPath[MAX_PATH];
      CHAR            computerName[82];
      DWORD            nameLength = 80;
      
      // try to creates and initializes a unique query structure
    pdhStatus = PdhOpenQuery ( NULL, 0, &hQuery );
   
      if ( pdhStatus == ERROR_SUCCESS )
      {
            if ( GetComputerName( computerName, &nameLength ) == TRUE )
            {
                  // try for memory
                  sprintf(CounterPath, "%s%s%s", "\\\\", computerName, "\\Memory\\% Committed Bytes In Use");

                  pdhStatus = PdhAddCounter (hQuery,CounterPath, 1, &hMemCounter);

                  if ( pdhStatus != ERROR_SUCCESS )
                  {
                        // error in adding
                        return ( -3 );
                  }
            }
            else
            {
                  // error in getting computer name
                  return ( -2 );
            }
      }
      else
      {
            // error in creating the query
            return ( -1 );
      }

      // everything is ok
      return ( 0 );      
}


void CloseCounter()
{
    if ( hQuery != NULL )
      {
            // close the query
        PdhCloseQuery ( hQuery );
        hQuery = NULL;
    }
}



long GetMEMCounterValue()
{
    PDH_STATUS                        pdhStatus;
    PDH_FMT_COUNTERVALUE      pValue;
      
    if ( hQuery != NULL )
      {
        // update the collection
        pdhStatus = PdhCollectQueryData ( hQuery );

        if ( pdhStatus == ERROR_SUCCESS )
            {
                  if ( hMemCounter )
                  {
                        // get the Mem value
                        pdhStatus = PdhGetFormattedCounterValue ( hMemCounter, PDH_FMT_LONG, 0, &pValue );
                  
                        if ( pdhStatus == ERROR_SUCCESS )
                        {
                              return ( pValue.longValue );      
                        }
                        else
                        {
                              // error in getting the mem value
                              return ( -4 );
                        }
                  }
                  else
                  {
                        // memory counter is null
                        return ( -3 );
                  }
        }
            else
            {
                  // error in collection
                  return ( -2 );
            }
       }

      // error ; query not initialized
      return ( -1 );
}

For Windows 95/98, you can use registry for performance data. It will be under HKEY_DYN_DATA. You can use RegQueryValueEx to get memory usage or processor usage.
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sudhirbratCommented:
The registry key HKEY_DYN_DATA in NT may not work, but it works in 95/98.


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