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Subject: Re: [boost] [object_pool]too slow?
From: 邱宇舟 (qbowater_at_[hidden])
Date: 2009-03-10 06:49:25


boost::object_pool is not thread-safe.

2009/3/10 <jon_zhou_at_[hidden]>:
>
> Dear boost members,
>
> anyony can check the code below? the way that I am using boost/pool is correct?
>
> it is too slow in my "linux 2.6+Intel(R) Core(TM)2 Duo CPU     E6850  @ 3.00GHz" pc
>
> thanks!
>
>
> *********
> #include "boost/pool/object_pool.hpp"
> #include <sys/time.h>
> #include <pthread.h>
> #include <asm/atomic.h>
> #include <stdlib.h>
>
>
>
>
> class Rational
> {
> public:
>    Rational(int a = 0,int b = 1):n(a),d(b)
>    {
>    }
>
>
> private:
>    int n;
>    int d;
>
> };
>
> atomic_t gv;
> boost::object_pool<Rational> pool;
>
> void *thread_function(void *arg)
> {
>
>   struct timeval tpstart,tpend;
>   atomic_t *v=(atomic_t *)arg;
>   Rational *array[1000];
>   // Start timing here
>   gettimeofday(&tpstart,NULL);
>
>
>    for (int j = 0; j < 50000; j++)
>    {
>        for (int i = 0; i < 1000; i++)
>        {
>            array[i] = pool.construct(i);
>
>        }
>        for (int i = 0; i < 1000; i++)
>        {
>            pool.destroy(array[i]);
>        }
>    }
>    gettimeofday(&tpend,NULL);
>    int timeuse = (tpend.tv_sec-tpstart.tv_sec)*1000000 + (tpend.tv_usec-tpstart.tv_usec);
>    printf("time= %d usec\n",timeuse);
>    atomic_add(timeuse, v);
> }
>
>
> int main(int argc,char **argv)
> {
>    if (argc != 2)
>    {
>        perror("usuage:Mempool numberOfThreads\n");
>        exit(-1);
>    }
>    /*
>    * initialize atomic_t
>    */
>    atomic_set(&gv, 0);
>    char *end;
>    int numThreads = strtol(argv[1],&end,10);
>    pthread_t a_thread[numThreads];
>
>
>    void *thread_result;
>    int res;
>    for (int i=0; i < numThreads;i++)
>    {
>        res = pthread_create(&a_thread[i], NULL, thread_function, (void *)&gv);
>    }
>
>    for (int i=0; i < numThreads;i++)
>    {
>        res = pthread_join(a_thread[i], &thread_result);
>    }
>
>    printf("\nTotal time= %d usec\n",gv);
> }
>
> Regards,
> zhou rui
>
>
> _______________________________________________
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>


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