malloc_info(3)             Library Functions Manual             malloc_info(3)

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       malloc_info - <?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?> malloc <?> <?><?><?><?><?>

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       <?><?><?><?><?> C (libc, -lc)

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       #include <malloc.h>

       int malloc_info(int options, FILE *stream);

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       <?><?><?><?><?><?><?><?> (arenas) (<?><?><?><?><?><?><?><?> malloc(3)).

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       <?><?><?><?><?> <?><?><?><?>.

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       On success, malloc_info()  returns 0.  On failure, it returns -1, and
       errno is set to indicate the error.

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       EINVAL <?><?><?><?><?><?><?><?> options <?><?> <?><?><?><?><?>.

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       +----------------------------+----------------------------------------------------------+--------------------------+
       |<?><?><?><?><?><?><?><?><?> | <?><?><?><?><?><?><?>                                    | <?><?><?><?><?><?><?><?> |
       +----------------------------+----------------------------------------------------------+--------------------------+
       |malloc_info()               | <?><?><?><?><?><?><?><?><?><?><?><?> <?> <?><?><?><?><?> | MT-Safe                  |
       +----------------------------+----------------------------------------------------------+--------------------------+
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       GNU.

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       glibc 2.10.

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           $ getconf GNU_LIBC_VERSION
           glibc 2.13
           $ ./a.out 1 10000 100
           ============ Before allocating blocks ============
           <malloc version="1">
           <heap nr="0">
           <sizes>
           </sizes>
           <total type="fast" count="0" size="0"/>
           <total type="rest" count="0" size="0"/>
           <system type="current" size="135168"/>
           <system type="max" size="135168"/>
           <aspace type="total" size="135168"/>
           <aspace type="mprotect" size="135168"/>
           </heap>
           <total type="fast" count="0" size="0"/>
           <total type="rest" count="0" size="0"/>
           <system type="current" size="135168"/>
           <system type="max" size="135168"/>
           <aspace type="total" size="135168"/>
           <aspace type="mprotect" size="135168"/>
           </malloc>

           ============ After allocating blocks ============
           <malloc version="1">
           <heap nr="0">
           <sizes>
           </sizes>
           <total type="fast" count="0" size="0"/>
           <total type="rest" count="0" size="0"/>
           <system type="current" size="1081344"/>
           <system type="max" size="1081344"/>
           <aspace type="total" size="1081344"/>
           <aspace type="mprotect" size="1081344"/>
           </heap>
           <heap nr="1">
           <sizes>
           </sizes>
           <total type="fast" count="0" size="0"/>
           <total type="rest" count="0" size="0"/>
           <system type="current" size="1032192"/>
           <system type="max" size="1032192"/>
           <aspace type="total" size="1032192"/>
           <aspace type="mprotect" size="1032192"/>
           </heap>
           <total type="fast" count="0" size="0"/>
           <total type="rest" count="0" size="0"/>
           <system type="current" size="2113536"/>
           <system type="max" size="2113536"/>
           <aspace type="total" size="2113536"/>
           <aspace type="mprotect" size="2113536"/>
           </malloc>

   <?><?><?><?><?><?><?><?> <?><?><?> <?><?><?><?><?><?><?><?><?>
       #include <err.h>
       #include <errno.h>
       #include <malloc.h>
       #include <pthread.h>
       #include <stdlib.h>
       #include <unistd.h>

       static size_t        blockSize;
       static size_t        numThreads;
       static unsigned int  numBlocks;

       static void *
       thread_func(void *arg)
       {
           int tn = (int) arg;

           /* The multiplier '(2 + tn)' ensures that each thread (including
              the main thread) allocates a different amount of memory. */

           for (unsigned int j = 0; j < numBlocks; j++)
               if (malloc(blockSize * (2 + tn)) == NULL)
                   err(EXIT_FAILURE, "malloc-thread");

           sleep(100);         /* Sleep until main thread terminates. */
           return NULL;
       }

       int
       main(int argc, char *argv[])
       {
           int        sleepTime;
           pthread_t  *thr;

           if (argc < 4) {
               fprintf(stderr,
                       "%s num-threads num-blocks block-size [sleep-time]\n",
                       argv[0]);
               exit(EXIT_FAILURE);
           }

           numThreads = atoi(argv[1]);
           numBlocks = atoi(argv[2]);
           blockSize = atoi(argv[3]);
           sleepTime = (argc > 4) ? atoi(argv[4]) : 0;

           thr = calloc(numThreads, sizeof(*thr));
           if (thr == NULL)
               err(EXIT_FAILURE, "calloc");

           printf("============ Before allocating blocks ============\n");
           malloc_info(0, stdout);

           /* Create threads that allocate different amounts of memory. */

           for (size_t tn = 0; tn < numThreads; tn++) {
               errno = pthread_create(&thr[tn], NULL, thread_func,
                                      (void *) tn);
               if (errno != 0)
                   err(EXIT_FAILURE, "pthread_create");

               /* If we add a sleep interval after the start-up of each
                  thread, the threads likely won't contend for malloc
                  mutexes, and therefore additional arenas won't be
                  allocated (see malloc(3)). */

               if (sleepTime > 0)
                   sleep(sleepTime);
           }

           /* The main thread also allocates some memory. */

           for (unsigned int j = 0; j < numBlocks; j++)
               if (malloc(blockSize) == NULL)
                   err(EXIT_FAILURE, "malloc");

           sleep(2);           /* Give all threads a chance to
                                  complete allocations. */

           printf("\n============ After allocating blocks ============\n");
           malloc_info(0, stdout);

           exit(EXIT_SUCCESS);
       }

<?><?><?><?><?><?><?><?> <?><?><?><?><?>
       mallinfo(3), malloc(3), malloc_stats(3), mallopt(3), open_memstream(3)

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       <?><?><?><?><?><?><?><?><?><?>(<?>) aereiae <aereiae@gmail.com>, Alexey
       <a.chepugov@gmail.com>, Azamat Hackimov <azamat.hackimov@gmail.com>,
       Dmitriy S. Seregin <dseregin@59.ru>, Dmitry Bolkhovskikh
       <d20052005@yandex.ru>, ITriskTI <ITriskTI@gmail.com>, Max Is
       <ismax799@gmail.com>, Yuri Kozlov <yuray@komyakino.ru>, <?><?><?><?>
       <?><?><?><?><?><?> <pavia00@gmail.com>, <?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?>
       <maljanow@outlook.com> <?> Kirill Rekhov <krekhov.dev@gmail.com>

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       <?><?><?><?><?><?><?><?> GNU (GNU General Public License - GPL,
       <https://www.gnu.org/licenses/gpl-3.0.html> <?><?><?><?><?><?> 3
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       <<debian-l10n-russian@lists.debian.org>>.

<?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?> Linux 6.9.1
                           15 <?><?><?><?> 2024 <?>.            malloc_info(3)