[Gluster-devel] Possible memory leak in gluster samba vfs

Fri Sep 13 13:52:16 UTC 2013

On 09/13/2013 06:03 PM, kane wrote:
> Hi
>
> We use samba gluster vfs in IO test, but meet with gluster server smbd
> oom killer,
> The smbd process spend over 15g RES with top command show, in the end
> is our simple test code:
>
> gluster server vfs --> smbd --> client mount dir "/mnt/vfs"--> execute
> vfs test program "$ ./vfs 1000"
>
> then we can watch gluster server smbd RES with top command.
>
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 4000 soul 20 0 5486m 4.9g 10m R 108.4 31.5 111:07.07 smbd
> 3447 root 20 0 1408m 44m 2428 S 44.4 0.3 59:11.55 glusterfsd
>
> io test code:
> =======================================
> #define _LARGEFILE64_SOURCE
>
> #include <stdio.h>
> #include <unistd.h>
> #include <string.h>
> #include <pthread.h>
> #include <stdlib.h>
> #include <fcntl.h>
> #include <sys/types.h>
>
> int WT = 1;
>
> #define RND(x) ((x>0)?(genrand() % (x)):0)
> extern unsigned long genrand();
> extern void sgenrand();
>
> /* Period parameters */
> #define N 624
> #define M 397
> #define MATRIX_A 0x9908b0df /* constant vector a */
> #define UPPER_MASK 0x80000000 /* most significant w-r bits */
> #define LOWER_MASK 0x7fffffff /* least significant r bits */
>
> /* Tempering parameters */
> #define TEMPERING_MASK_B 0x9d2c5680
> #define TEMPERING_MASK_C 0xefc60000
> #define TEMPERING_SHIFT_U(y) (y >> 11)
> #define TEMPERING_SHIFT_S(y) (y << 7)
> #define TEMPERING_SHIFT_T(y) (y << 15)
> #define TEMPERING_SHIFT_L(y) (y >> 18)
>
> static unsigned long mt[N]; /* the array for the state vector */
> static int mti=N+1; /* mti==N+1 means mt[N] is not initialized */
>
> /* Initializing the array with a seed */
> void
> sgenrand(seed)
> unsigned long seed;
> {
> int i;
>
> for (i=0;i<N;i++) {
> mt[i] = seed & 0xffff0000;
> seed = 69069 * seed + 1;
> mt[i] |= (seed & 0xffff0000) >> 16;
> seed = 69069 * seed + 1;
> }
> mti = N;
> }
>
> unsigned long
> genrand()
> {
> unsigned long y;
> static unsigned long mag01[2]={0x0, MATRIX_A};
> /* mag01[x] = x * MATRIX_A for x=0,1 */
>
> if (mti >= N) { /* generate N words at one time */
> int kk;
>
> if (mti == N+1) /* if sgenrand() has not been called, */
> sgenrand(4357); /* a default initial seed is used */
>
> for (kk=0;kk<N-M;kk++) {
> y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);
> mt[kk] = mt[kk+M] ^ (y >> 1) ^ mag01[y & 0x1];
> }
> for (;kk<N-1;kk++) {
> y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);
> mt[kk] = mt[kk+(M-N)] ^ (y >> 1) ^ mag01[y & 0x1];
> }
> y = (mt[N-1]&UPPER_MASK)|(mt[0]&LOWER_MASK);
> mt[N-1] = mt[M-1] ^ (y >> 1) ^ mag01[y & 0x1];
>
> mti = 0;
> }
> y = mt[mti++];
> y ^= TEMPERING_SHIFT_U(y);
> y ^= TEMPERING_SHIFT_S(y) & TEMPERING_MASK_B;
> y ^= TEMPERING_SHIFT_T(y) & TEMPERING_MASK_C;
> y ^= TEMPERING_SHIFT_L(y);
>
> return y;
> }
>
> char *initialize_file_source(int size)
> {
> char *new_source;
> int i;
>
> if ((new_source=(char *)malloc(size))==NULL) /* allocate buffer */
> fprintf(stderr,"Error: failed to allocate source file of size %d\n",size);
> else
> for (i=0; i<size; i++) /* file buffer with junk */
> new_source[i]=32+RND(95);
>
> return(new_source);
> }
>
> void *tran_file(void *map)
> {
> int block_size = 512;
> char *read_buffer; /* temporary space for reading file data into */
> int fd = open((char *)map, O_RDWR | O_CREAT | O_TRUNC, 0644);
> if(fd == -1) {
> perror("open");
> return ;
> }
>
> //read_buffer=(char *)malloc(block_size);
> //memset(read_buffer, 0x56, block_size);
> read_buffer = initialize_file_source(block_size);
> while(WT){
> sleep(1);
> pwrite(fd, read_buffer, block_size, 0);
> pread(fd, read_buffer, block_size, 0);
> }
> free(read_buffer);
> close(fd);
> }
>
> int main(int argc, char *argv[])
> {
> if(argc == 1) {
> printf("Set file name and file size in GB!\n");
> return -1;
> }
>
> unsigned long long length = atoll(argv[1]) * 1024 * 1024 * 1024;
> unsigned long long index = 0;
> unsigned long long count = 0;
> int fd = 0;
> char path[32];
> char *swap = NULL;
> int psize = 65536;
> int ret = 0;
> int ret_i = 0;
> void *tret;
> pthread_t rtid_1;
> pthread_t rtid_2;
> pthread_t rtid_3;
> pthread_t rtid_4;
> int fd_i = 0;
> int a_size = 256;
> char *append_buffer; /* temporary space for reading file data into */
>
> swap = (char *)malloc(sizeof(char) * psize);
> if(swap == NULL) {
> printf("Malloc Swap Failed!\n");
> close(fd);
> return -1;
> }
> memset(swap, 0x55, psize);
>
> append_buffer = initialize_file_source(a_size);
>
> pthread_create(&rtid_1, NULL, tran_file, "/mnt/vfs/a.map");
> pthread_create(&rtid_2, NULL, tran_file, "/mnt/vfs/b.map");
> pthread_create(&rtid_3, NULL, tran_file, "/mnt/vfs/c.map");
> pthread_create(&rtid_4, NULL, tran_file, "/mnt/vfs/d.map");
>
> while(index < length)
> {
> if((index % (1024*1024*1024)) == 0) {
> count++;
> sprintf(path, "/mnt/vfs/data/%08lld.dat", count);
> if((fd = open(path, O_RDWR | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR)) < 0)
> {
> printf("Can not open io file: %s\n", path);
> perror("open");
> return -1;
> }
> sprintf(path, "/mnt/vfs/data/%08lld.index", count);
> if((fd_i = open(path, O_RDWR | O_CREAT | O_APPEND, S_IRUSR | S_IWUSR))
> < 0)
> {
> printf("Can not open io file: %s\n", path);
> perror("open");
> return -1;
> }
> printf("...1GiB\n");
> }
>
> ret = pwrite(fd, swap, psize, (index % (1024*1024*1024)));
> if(ret != psize) {
> perror("write");
> printf("Write data file failed!\n");
> continue;
> }
> lseek64(fd_i, ((index*a_size)/65536), SEEK_SET);
> ret_i = write(fd_i, append_buffer, a_size);
> if(ret_i != a_size) {
> perror("write");
> printf("Write index file failed!\n");
> continue;
> }
>
> index += ret;
> if((index % (1024*1024*1024)) == 0) {
> close(fd);
> close(fd_i);
> }
> }
>
> WT = 0;
> pthread_join(rtid_1, &tret);
> pthread_join(rtid_2, &tret);
> pthread_join(rtid_3, &tret);
> pthread_join(rtid_4, &tret);
> printf("%s GB write\n", argv[1]);
> sync();
> free(swap);
> free(append_buffer);
>
> return 0;
> }
>
> =======================================
>
>
>
>
> kane
> ----------------------------------------------------------------
> Email: kai.zhou at soulinfo.com <mailto:kai.zhou at soulinfo.com>
> 电话: 0510-85385788-616
>
>
Thanks for the code. I will try to reproduce the issue using your code.

-Lala
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