atomics

[BogDan]

WOW, very very interesting results ...
Thanks.

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 6:30 PM
>Subject: RE: atomics
>
>There you go
>
>Not sure what will happen with the names of the files, so:
>...galax~1.log is: galaxy tab10" 
>...galax~2.log is: galaxy s2
>
>________________________________________
>From: ext BogDan [bog_dan_ro at yahoo.com]
>Sent: Thursday, July 14, 2011 3:53 PM
>To: BogDan; Senyk Thomas (Nokia-DXM/Munich); necessitas-devel at kde.org
>Subject: Re: atomics
>
>One more thing, "int atomic_xxxxxx" must NOT be inline functions because it will break the ABI !
>
>BogDan.
>
>
>
>>________________________________
>>From: BogDan <bog_dan_ro at yahoo.com>
>>To: "thomas.senyk at nokia.com" <thomas.senyk at nokia.com>; "necessitas-devel at kde.org" <necessitas-devel at kde.org>
>>Sent: Thursday, July 14, 2011 4:46 PM
>>Subject: Re: atomics
>>
>>
>>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
>>>
>>>
>>>
>>_______________________________________________
>>Necessitas-devel mailing list
>>Necessitas-devel at kde.org
>>https://mail.kde.org/mailman/listinfo/necessitas-devel
>>
>>
>>
>
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