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Measure thread execution (in C, unix)

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# 1  
Old 03-23-2011
Measure thread execution (in C, unix)


I have a simulation program which creates two threads and I would like to know if I can measure the time of each individual thread. Threads communicate (I use pthread to manage them) and I want to measure communication time. I found a solution with clock_gettime and CLOCK_THREAD_CPUTIME_ID but nothing for Solaris OS.
French forums are insufficient, so I hope to find help here Smilie

Note: two threads on identical topic merged. Please do not post twice on the same topic - this kind of hodge-podge results from doing that.

Last edited by jim mcnamara; 03-24-2011 at 12:50 PM.. Reason: duplicate topics merged
# 2  
Old 03-23-2011
I'm not quite sure I understand the question. Sorry. Smilie What's the difference between thread time and system time?
# 3  
Old 03-23-2011
I have two threads with WRITE/READ between them. The synchronisation works (I use pthread library) but I must calculate the execution of the READ function.
A part of my program :
void ReadWithWait_##Type (_C_ReadWithWait_##Type *C){ \
    _int Length_ = 0; \
    SYSTEM_TIME_TYPE entry; \
    SYSTEM_TIME_TYPE curr; \
    RETURN_CODE_TYPE retCode; \
    Dur waitDur = 0; \
    GET_TIME(&entry, &retCode); \
    C->_O0_Validity_ = INVALID; \
    if (C->_M_init == true) \
    { \
        (C->_O1_Message_) = *(C->_I3_InitMessage_); \
        C->_PrevMsg = *(C->_I3_InitMessage_); \
        C->_M_init = false; \
    } \
    while((waitDur <= (C->_I2_TimeOut_)) && ((C->_O0_Validity_) == INVALID)) \
    { \
        READ_SAMPLING_MESSAGE( ... ); \
        GET_TIME(&curr, &retCode); \
        waitDur = (Dur)(curr - entry); \
    } \
    if (waitDur > (C->_I2_TimeOut_)) \
    { \
        (C->_O0_Validity_) = INVALID; \
        (C->_O2_ReturnCode_)= (ReturnCode)TIMED_OUT; \
 printf("TIME OUT 2 : %d > %d\n",waitDur,(C->_I2_TimeOut_));\
    } \
    C->_PrevMsg = (C->_O1_Message_); \

Actually, GET_TIME uses gethrtime() => it's system time. But between my two GET_TIME, I'm not sure that only this function is executed. Processor switchs between thread 1 and 2 so waitdur is variable, that's why I want to know a solution to calculate only thread time.
# 4  
Old 03-23-2011
So, something to count CPU time the thread has spent running since last, but not count time the thread has spent suspended?
# 5  
Old 03-23-2011
another topic explains this problem better than me but doesn't give a solution :

Last edited by Tinkh; 03-23-2011 at 02:42 PM..
# 6  
Old 03-23-2011
Which version of Solaris are you using? I believe that CLOCK_THREAD_CPUTIME_ID was added in one of the later Solaris 10 updates. However, it might have only been added to the header to pass the UNIX03 VSTH test suite and not actually implemented.

Another possible way is to use getrusage(RUSAGE_LWP, ....) In Solaris 9 and above the default correspondence between threads and LWPs is 1x1, not MxN.
This User Gave Thanks to fpmurphy For This Post:
# 7  
Old 03-24-2011
Thank you for reply Smilie

I already try to use CLOCK_THREAD_CPUTIME_ID but it does'nt work with Solaris 8.
I'm trying to use getrusage with RUSAGE_SELF (RUSAGE_LWP is not available in sys/resource.h, there's just RUSEGE_SELF and RUSAGE_CHILDREN). I hope it's a way to find solution ...

---------- Post updated at 11:37 AM ---------- Previous update was at 11:36 AM ----------

Bad news, I have a strange behaviour with getrusage.
My old function GET_TIME :

* SystemTime = gethrtime(); *ReturnCode=NO_ERROR;

The new one :

    ret = getrusage(RUSAGE_SELF, &usage);
    * SystemTime = (usage.ru_utime.tv_sec*1000000 + usage.ru_utime.tv_usec)*1000;

Between two GET_TIME, time is 200 000 ns approximately.
With GET_TIME2, this value can reach 10 000 000 or -7000 and it's equal to 0 majority... Smilie

Last edited by Tinkh; 03-24-2011 at 10:17 AM..

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