4k memory is not for malloc() that you call.
malloc() return address pointing to heap. pmap showed heap in-use size is 0.
In fact, you have to free abc and lala which may cure your problem.
2007/8/7, johny@xxxxxxxxxxxxxx <johny@xxxxxxxxxxxxxx>:
> hi, all
>
> i want to ask, why free function did not do properly as it expected
> (happened in test_malloc.c), the usage memory (using malloc) still exist
> please help me, i have another program it, doing malloc continously, and
> free it when not needed, this happened several times,
> after some looping, my memory become 0 free, and it got hang.i did some
> investigation, and found there is something strange in free.
>
> anyone got idea what happen and give me a solution?
>
> thanks in advance
> Johny Jugianto
>
> using gcc:
> $ gcc --version
> gcc (GCC) 4.2.0
>
> here is my machine info
> $ uname -a
> Linux localhost.svr 2.6.9-55.ELsmp #1 SMP Wed May 2 14:28:44 EDT 2007 i686
> athlon i386 GNU/Linux
>
>
> -RESULT: pmap for test_malloc.c after ready to insert-----------------
> [nyto@nyto ~]$ pmap 5836
> 5836: ./test_malloc
> 007ad000 88K r-x-- /lib/ld-2.3.4.so
> 007c3000 4K r---- /lib/ld-2.3.4.so
> 007c4000 4K rw--- /lib/ld-2.3.4.so
> 007c7000 1176K r-x-- /lib/tls/libc-2.3.4.so
> 008ed000 8K r---- /lib/tls/libc-2.3.4.so
> 008ef000 8K rw--- /lib/tls/libc-2.3.4.so
> 008f1000 8K rw--- [ anon ]
> 08048000 4K r-x-- /home/nyto/test_malloc
> 08049000 4K rw--- /home/nyto/test_malloc
> 08dcb000 132K rw--- [ anon ]
> b7ba2000 3920K rw--- [ anon ]
> bfff0000 64K rw--- [ stack ]
> ffffe000 4K ----- [ anon ]
> total 5424K
> -RESULT: pmap for test_malloc.c after done free-----------------------
> [nyto@nyto ~]$ pmap 5836
> 5836: ./test_malloc
> 007ad000 88K r-x-- /lib/ld-2.3.4.so
> 007c3000 4K r---- /lib/ld-2.3.4.so
> 007c4000 4K rw--- /lib/ld-2.3.4.so
> 007c7000 1176K r-x-- /lib/tls/libc-2.3.4.so
> 008ed000 8K r---- /lib/tls/libc-2.3.4.so
> 008ef000 8K rw--- /lib/tls/libc-2.3.4.so
> 008f1000 8K rw--- [ anon ]
> 08048000 4K r-x-- /home/nyto/test_malloc
> 08049000 4K rw--- /home/nyto/test_malloc
> 08dcb000 15708K rw--- [ anon ]
> b7ba2000 3920K rw--- [ anon ]
> bfff0000 64K rw--- [ stack ]
> ffffe000 4K ----- [ anon ]
> total 21000K
> -RESULT: pmap for test_malloc2.c after ready to insert----------------
> [nyto@nyto ~]$ pmap 5841
> 5841: ./test_malloc2
> 007ad000 88K r-x-- /lib/ld-2.3.4.so
> 007c3000 4K r---- /lib/ld-2.3.4.so
> 007c4000 4K rw--- /lib/ld-2.3.4.so
> 007c7000 1176K r-x-- /lib/tls/libc-2.3.4.so
> 008ed000 8K r---- /lib/tls/libc-2.3.4.so
> 008ef000 8K rw--- /lib/tls/libc-2.3.4.so
> 008f1000 8K rw--- [ anon ]
> 08048000 4K r-x-- /home/nyto/test_malloc2
> 08049000 4K rw--- /home/nyto/test_malloc2
> 087c3000 132K rw--- [ anon ]
> b7baa000 3920K rw--- [ anon ]
> bfee6000 1128K rw--- [ stack ]
> ffffe000 4K ----- [ anon ]
> total 6488K
> -RESULT: pmap for test_malloc2.c after done free----------------------
> [nyto@nyto ~]$ pmap 5841
> 5841: ./test_malloc2
> 007ad000 88K r-x-- /lib/ld-2.3.4.so
> 007c3000 4K r---- /lib/ld-2.3.4.so
> 007c4000 4K rw--- /lib/ld-2.3.4.so
> 007c7000 1176K r-x-- /lib/tls/libc-2.3.4.so
> 008ed000 8K r---- /lib/tls/libc-2.3.4.so
> 008ef000 8K rw--- /lib/tls/libc-2.3.4.so
> 008f1000 8K rw--- [ anon ]
> 08048000 4K r-x-- /home/nyto/test_malloc2
> 08049000 4K rw--- /home/nyto/test_malloc2
> 087c3000 132K rw--- [ anon ]
> b7baa000 3920K rw--- [ anon ]
> bfee6000 1128K rw--- [ stack ]
> ffffe000 4K ----- [ anon ]
> total 6488K
>
>
> -FILE: test_malloc.c--------------------------------------------------
> #include<stdio.h>
> #include<stdlib.h>
> #include<string.h>
>
> #define JUMLAH 1000000
> #define ISI 100
>
> typedef struct _dodol
> {
> char *abc;
> } dodol;
>
> int main()
> {
> dodol **abc = (dodol**)calloc( JUMLAH, sizeof(dodol*) );
> char *lala = (char*)malloc(sizeof(char)*ISI +1);
> int i;
> char a[10];
>
> for(i=0; i<ISI; i++)
> lala[i] = 'a';
> lala[i]=0;
>
> printf("ready to insert\n");
> scanf("%s",a);
>
> for(i=0; i<JUMLAH; i++) {
> abc[i] = (dodol *)malloc(sizeof(dodol));
> //free( abc[i] );
> }
>
> //printf("ready to free\n");
> //scanf("%s",a);
>
> for(i=0; i<JUMLAH; i++) {
> free( abc[i] );
> }
> //free(abc);
>
> printf("done free\n");
> scanf("%s",a);
>
> return 0;
> }
> -FILE: test_malloc2.c-------------------------------------------------
> #include<stdio.h>
> #include<stdlib.h>
> #include<string.h>
>
> #define JUMLAH 1000000
> #define ISI 100
>
> typedef struct _dodol
> {
> char *abc;
> } dodol;
>
> int main()
> {
> dodol **abc = (dodol**)calloc( JUMLAH, sizeof(dodol*) );
> char *lala = (char*)malloc(sizeof(char)*ISI +1);
> int i;
> char a[10];
>
> for(i=0; i<ISI; i++)
> lala[i] = 'a';
> lala[i]=0;
>
> printf("ready to insert\n");
> scanf("%s",a);
>
> for(i=0; i<JUMLAH; i++) {
> abc[i] = (dodol *)malloc(sizeof(dodol));
> free( abc[i] );
> }
>
> //printf("ready to free\n");
> //scanf("%s",a);
>
> for(i=0; i<JUMLAH; i++) {
> //free( abc[i] );
> }
> //free(abc);
>
> printf("done free\n");
> scanf("%s",a);
>
> return 0;
> }
>
>
>
--
Best wishes!
Yours,
Lijuan Hai
_ _
(_)(_)
(,,)
=()=
((__)\
_|L\_______/
