graphicstest/graphicstestharness/src/t_simloadutils.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 31 Aug 2010 16:31:06 +0300
branchRCL_3
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permissions -rw-r--r--
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// Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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//
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/**
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 @file
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 @test
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*/
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#include <e32math.h>
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#include <e32debug.h>
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#include <iniparser.h>
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#include "t_simload.h"
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#include "t_simloadutils.h"
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EXPORT_C TBool CTSimLoadAppUtils::IsStaticLoadL()
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	{
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	CIniData * iniData = CIniData::NewL(KSimLoadConfigFile);
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	CleanupStack::PushL(iniData);
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	TPtrC value;
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	User::LeaveIfError(iniData->FindVar(KDefaultSectionName, KConfigSimLoadType(), value));
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	HBufC* simLoadType = value.Alloc();
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	CleanupStack::PopAndDestroy(iniData);
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	TBool ret = EFalse;
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	if (simLoadType!=NULL && simLoadType->Des().Compare(_L("KSimLoadStatic")) == KErrNone)
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		{
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		ret = ETrue;
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		}
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	else
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		{
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		if (simLoadType!=NULL && simLoadType->Des().Compare(_L("KSimLoadSpiked")) != KErrNone)
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			{
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			User::Leave(KErrAbort);
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			}
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		}
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	return ret;
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	}
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EXPORT_C TInt CTSimLoadAppUtils::SimLoadL()
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	{
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	CIniData * iniData = CIniData::NewL(KSimLoadConfigFile);
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	CleanupStack::PushL(iniData);
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	TInt ret;
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	User::LeaveIfError(iniData->FindVar(KDefaultSectionName, KConfigSimLoadValue(), ret));
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	CleanupStack::PopAndDestroy(iniData);
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	return ret;
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	}
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EXPORT_C void CTSimLoadAppUtils::SimulateStaticLoadL(TInt aLoadPercentage, TInt aDelay)
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	{
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	if (aLoadPercentage>=0)
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		{
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		// assuming the figure read in was '%' calculate the loop count
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		// required to achieve the simulated load required
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		const TInt mySimLoad = CalculateSimLoadL(aLoadPercentage);
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		TInt internalDelay = aDelay;
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		if (aLoadPercentage==0)
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			{
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			// set delay to large number, so that simload process is still
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			// running at end of test, and therefore not cause issue with
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			// TEF execution determining the test has failed because
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			// the sim load app is not running at end of test.
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			internalDelay = 30000000; // 30s
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			}
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		SimulateTestLoad(mySimLoad, internalDelay);
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		}
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	}
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EXPORT_C void CTSimLoadAppUtils::SimulateSpikedLoad()
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	{
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	SimulateTestLoad(1500000, 100000);
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	}
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void CTSimLoadAppUtils::SimulateTestLoad(TInt aSimLoad, TInt aDelay)
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	{
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	FOREVER
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		{
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		for (TInt i = 0; i <= aSimLoad; i++)
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			{
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			//Load the CPU by forcing it to execute the NOP The load value
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			//is dependant upon the value of aSimLoad and the load type (either
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			//static or spiked) by the ratio of aSimload to aDelay
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			//Tuned to work with the H4 only
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			#if !defined(__WINS__) && !defined(__X86GCC__)
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			asm{nop;};
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			#endif
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			}
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		User::After(aDelay);
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		}
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	}
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TInt CTSimLoadAppUtils::CalculateSimLoadL(TInt aPercentage)
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	{
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	TInt32 calculatedLoad = 0;
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	if (aPercentage>0)
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		{
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		// based on measurements performed using Symbian Sample Profiler
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		// .../base/e32utils/analyse/profiler.rtf
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		// and then utilising curve fit (http://www.ebicom.net/~dhyams/cftp.htm)
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		// the following formula was determined to best calculate the load
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		// based on a required percentage
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		// simload = a + b*aPercentage + c*aPercentage^2 + d*aPercentage^3 + e*aPercentage^4
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		const TReal a = 92600;
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		const TReal b = -32000;
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		const TReal c = 4700;
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		const TReal d = -114;
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		const TReal e = 0.91;
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		TReal tempValue = a + (b*aPercentage) + (c*aPercentage*aPercentage)
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		                    + (d*aPercentage*aPercentage*aPercentage)
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		                    + (e*aPercentage*aPercentage*aPercentage*aPercentage);
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		User::LeaveIfError(Math::Int(calculatedLoad, tempValue));
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		}
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	return calculatedLoad;
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	}