atomics

[BogDan]

Sorry :)
Attached !

BogDan.



>________________________________
>From: "thomas.senyk at nokia.com" <thomas.senyk at nokia.com>
>To: bog_dan_ro at yahoo.com; necessitas-devel at kde.org
>Sent: Thursday, July 14, 2011 4:38 PM
>Subject: RE: atomics
>
>The whitespaces and everything seams to be quite broken in your code-past :)
>
>Could you create a projects, tar it and send it as attachment? This would help a lot and more people will be willing to run it :)
>
>Greets
>Thomas
>________________________________________
>From: ext BogDan [bog_dan_ro at yahoo.com]
>Sent: Friday, July 08, 2011 3:33 PM
>To: necessitas-devel at kde.org
>Subject: atomics
>
>Hello Folks,
>
>I've made a small application to test current available atomic implementations on android.
>This are the results on a HTC sensation device:
>
>
>Test 1
>===============================
>USING SMP safe ASM instructions
>--------------------------------------------------------------------
>Executing test_atomic_cmpxchg_ASM took 14714
>Executing test_atomic_cmpxchg_GCC took 15685
>Executing test_atomic_cmpxchg_Android took 8874
>Executing test_atomic_inc_ASM took 14310
>Executing test_atomic_inc_GCC took 16190
>Executing test_atomic_inc_Android took 8351
>===============================
>Test 2
>===============================
>USING SMP unsafe ASM instructions
>--------------------------------------------------------------------
>Executing test_atomic_cmpxchg_ASM took 6904
>Executing test_atomic_cmpxchg_GCC took 15814
>Executing test_atomic_cmpxchg_Android took 8864
>Executing test_atomic_inc_ASM took 6404
>Executing test_atomic_inc_GCC took 16048
>Executing test_atomic_inc_Android took 8198
>===============================
>
>
>
>And this is the code:
>
>#include<QDebug>
>#include<QDateTime>
>#include<sys/atomics.h>
>staticconstintLOOPS=100000000;
>#defineSMP_SAFE
>#ifdefSMP_SAFE
>#definesmp_mb__asm____volatile__("dmb":::"memory")
>#else
>#definesmp_mb
>#endif
>intatomic_cmpxchg(int&_q_value,intexpectedValue,intnewValue)
>{
>registerintresult;
>smp_mb;
>asmvolatile("0:\n"
>"ldrex%[result],[%[_q_value]]\n"
>"eors%[result],%[result],%[expectedValue]\n"
>"itteq\n"
>"strexeq%[result],%[newValue],[%[_q_value]]\n"
>"teqeq%[result],#1\n"
>"beq0b\n"
>:[result]"=&r"(result),
>"+m"(_q_value)
>:[expectedValue]"r"(expectedValue),
>[newValue]"r"(newValue),
>[_q_value]"r"(&_q_value)
>:"cc");
>smp_mb;
>returnresult==0;
>}
>voidtest_atomic_cmpxchg_ASM()
>{
>inttest=0;
>for(inti=0;i<LOOPS;i++)
>{
>atomic_cmpxchg(test,test,test+1);
>}
>qDebug()<<test;
>}
>voidtest_atomic_cmpxchg_GCC()
>{
>inttest=0;
>for(inti=0;i<LOOPS;i++)
>{
>__sync_bool_compare_and_swap(&test,test,test+1);
>}
>qDebug()<<test;
>}
>voidtest_atomic_cmpxchg_Android()
>{
>inttest=0;
>for(inti=0;i<LOOPS;i++)
>{
>__atomic_cmpxchg(test,test+1,&test);
>}
>qDebug()<<test;
>}
>intatomic_inc(int&_q_value,intvalueToAdd)
>{
>registerintoriginalValue;
>registerintnewValue;
>registerintresult;
>smp_mb;
>asmvolatile("0:\n"
>"ldrex%[originalValue],[%[_q_value]]\n"
>"add%[newValue],%[originalValue],%[valueToAdd]\n"
>"strex%[result],%[newValue],[%[_q_value]]\n"
>"teq%[result],#0\n"
>"bne0b\n"
>:[originalValue]"=&r"(originalValue),
>[newValue]"=&r"(newValue),
>[result]"=&r"(result),
>"+m"(_q_value)
>:[valueToAdd]"r"(valueToAdd),
>[_q_value]"r"(&_q_value)
>:"cc");
>smp_mb;
>returnoriginalValue;
>}
>voidtest_atomic_inc_ASM()
>{
>inttest=0;
>intlast=0;
>for(inti=0;i<LOOPS;i++)
>{
>last=atomic_inc(test,1);
>}
>qDebug()<<test<<last;
>}
>voidtest_atomic_inc_GCC()
>{
>inttest=0;
>intlast=0;
>for(inti=0;i<LOOPS;i++)
>{
>last=__sync_fetch_and_add(&test,1);
>}
>qDebug()<<test<<last;
>}
>voidtest_atomic_inc_Android()
>{
>inttest=0;
>intlast=0;
>for(inti=0;i<LOOPS;i++)
>{
>last=__atomic_inc(&test);
>}
>qDebug()<<test<<last;
>}
>voidtestAtomics()
>{
>#ifdefSMP_SAFE
>qDebug()<<"USINGSMPsafeASMinstructions";
>#else
>qDebug()<<"USINGSMPunsafeASMinstructions";
>#endif
>QDateTimestart=QDateTime::currentDateTimeUtc();
>test_atomic_cmpxchg_ASM();
>qDebug()<<"Executingtest_atomic_cmpxchg_ASMtook"<<start.msecsTo(QDateTime::currentDateTimeUtc());
>start=QDateTime::currentDateTimeUtc();
>test_atomic_cmpxchg_GCC();
>qDebug()<<"Executingtest_atomic_cmpxchg_GCCtook"<<start.msecsTo(QDateTime::currentDateTimeUtc());
>start=QDateTime::currentDateTimeUtc();
>test_atomic_cmpxchg_Android();
>qDebug()<<"Executingtest_atomic_cmpxchg_Androidtook"<<start.msecsTo(QDateTime::currentDateTimeUtc());
>start=QDateTime::currentDateTimeUtc();
>test_atomic_inc_ASM();
>qDebug()<<"Executingtest_atomic_inc_ASMtook"<<start.msecsTo(QDateTime::currentDateTimeUtc());
>start=QDateTime::currentDateTimeUtc();
>test_atomic_inc_GCC();
>qDebug()<<"Executingtest_atomic_inc_GCCtook"<<start.msecsTo(QDateTime::currentDateTimeUtc());
>start=QDateTime::currentDateTimeUtc();
>test_atomic_inc_Android();
>qDebug()<<"Executingtest_atomic_inc_Androidtook"<<start.msecsTo(QDateTime::currentDateTimeUtc());
>}
>
>
>Please try this code on a different devices and post the results here.
>
>Thanks,
>BogDan.
>_______________________________________________
>Necessitas-devel mailing list
>Necessitas-devel at kde.org
>https://mail.kde.org/mailman/listinfo/necessitas-devel
>
>
>
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