Task manager does not directly update the memory usage after a free() operation,

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Hello Everyone,

Could somebody explaine me why the task manager does not directly update the memory usage after a free() operation?

I have the following loop:

MeassCollection = CreasteMeasurementCollection(); // based on CPtrArray

for (i = 1; i <= 8; i++) {
Meas = CreateMeasObject();
Meas.size = 1024s // samples
// this uses internally a malloc (pfSamples = (float*) malloc(Meas.Size * sizeof(float)));

for (j = 1; i <= 250; i++) {
MeasCloned = CreateMeasObject(Meas); // create an empty meas and copy the samples
// this uses internally a malloc (pfSamples = (float*) malloc(Meas.Size * sizeof(float)));

Meas.submeasurements.add (MeasCloned);

}
MeassCollection.Add(Meas);
}

If I run this several time the memory usage in the task manager does not return to the intial application startup state ?
Is it normal if I do not see the update directly ? Is it like a cache system for later allocation purposes?

Could you please explain ?

Thank you very much in advance.
Best regards.
SuperMiQi

Posted 11-Apr-12 7:03am

SuperMiQi

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Lakamraju Raghuram · Answer 1 · 2012-04-11T07:19:00

Solution 1

This article may help you

Windows Memory Management[^]

Posted 11-Apr-12 7:19am

Lakamraju Raghuram

Comments

SuperMiQi 11-Apr-12 13:42pm

Hello Sir,

Thank you very much. I still would like to know what you could suggest me to see the real memory usage ? Do you know a good memory tool viewer to check the memory usage ?

Thank you very much in advance.
Best regards.
SuperMiQi

jk chan 12-Apr-12 0:48am

check perfmon and add private bytes counter

SuperMiQi 18-Apr-12 4:18am

Hello jk chan,

I think after several loop iterations the memory usage is stable, it does not release immediatly but when allocation is needed it does not increase the application memory. I think it keeps it (magically) for later purposes.
If you have an idea how this could happen, I would be happy to read it.

Thank you very much in advance
Best regards.
SuperMiQi.