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Top Forums Programming Determining free(available) memory in MV linux Post 98548 by trancedeejay on Thursday 9th of February 2006 06:02:48 AM
Old 02-09-2006
HI
If I compare numbers on what free -m displays or what is the number on meminfo, they are different
free -m
total used free shared buffers cached
Mem: 492 23 469 0 1 14
-/+ buffers/cache: 7 485
Swap: 0 0 0



meminfo:
total: used: free: shared: buffers: cached:
Mem: 516644864 25026560 491618304 0 1560576 15425536
Swap: 0 0 0
MemTotal: 504536 kB
MemFree: 480096 kB
MemShared: 0 kB
Buffers: 1524 kB
Cached: 15064 kB
SwapCached: 0 kB
Active: 5556 kB
Inactive: 12048 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 504536 kB
LowFree: 480096 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Committed_AS: 1156 kB
VmallocTotal: 491512 kB
VmallocUsed: 596 kB
VmallocChunk: 490916 kB

What if I would somehow get the number of free memory and store it somewhere. Then memtester reads the number from stored place and checks that much amount of memory that number(should be in MB) is writen in stored place. Please help
Have a nice Day

Matt
 

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STATFS(2)						     Linux Programmer's Manual							 STATFS(2)

NAME
statfs, fstatfs - get file system statistics SYNOPSIS
#include <sys/vfs.h> int statfs(const char *path, struct statfs *buf); int fstatfs(int fd, struct statfs *buf); DESCRIPTION
statfs returns information about a mounted file system. path is the path name of any file within the mounted filesystem. buf is a pointer to a statfs structure defined as follows: struct statfs { long f_type; /* type of filesystem (see below) */ long f_bsize; /* optimal transfer block size */ long f_blocks; /* total data blocks in file system */ long f_bfree; /* free blocks in fs */ long f_bavail; /* free blocks avail to non-superuser */ long f_files; /* total file nodes in file system */ long f_ffree; /* free file nodes in fs */ fsid_t f_fsid; /* file system id */ long f_namelen; /* maximum length of filenames */ long f_spare[6]; /* spare for later */ }; File system types: linux/affs_fs.h: AFFS_SUPER_MAGIC 0xADFF linux/efs_fs.h: EFS_SUPER_MAGIC 0x00414A53 linux/ext_fs.h: EXT_SUPER_MAGIC 0x137D linux/ext2_fs.h: EXT2_OLD_SUPER_MAGIC 0xEF51 EXT2_SUPER_MAGIC 0xEF53 linux/hpfs_fs.h: HPFS_SUPER_MAGIC 0xF995E849 linux/iso_fs.h: ISOFS_SUPER_MAGIC 0x9660 linux/minix_fs.h: MINIX_SUPER_MAGIC 0x137F /* orig. minix */ MINIX_SUPER_MAGIC2 0x138F /* 30 char minix */ MINIX2_SUPER_MAGIC 0x2468 /* minix V2 */ MINIX2_SUPER_MAGIC2 0x2478 /* minix V2, 30 char names */ linux/msdos_fs.h: MSDOS_SUPER_MAGIC 0x4d44 linux/ncp_fs.h: NCP_SUPER_MAGIC 0x564c linux/nfs_fs.h: NFS_SUPER_MAGIC 0x6969 linux/proc_fs.h: PROC_SUPER_MAGIC 0x9fa0 linux/smb_fs.h: SMB_SUPER_MAGIC 0x517B linux/sysv_fs.h: XENIX_SUPER_MAGIC 0x012FF7B4 SYSV4_SUPER_MAGIC 0x012FF7B5 SYSV2_SUPER_MAGIC 0x012FF7B6 COH_SUPER_MAGIC 0x012FF7B7 linux/ufs_fs.h: UFS_MAGIC 0x00011954 linux/xfs_fs.h: XFS_SUPER_MAGIC 0x58465342 linux/xia_fs.h: _XIAFS_SUPER_MAGIC 0x012FD16D Fields that are undefined for a particular file system are set to 0. fstatfs returns the same information about an open file referenced by descriptor fd. RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately. ERRORS
For statfs: ENOTDIR A component of the path prefix of path is not a directory. ENAMETOOLONG path is too long. ENOENT The file referred to by path does not exist. EACCES Search permission is denied for a component of the path prefix of path. ELOOP Too many symbolic links were encountered in translating path. EFAULT Buf or path points to an invalid address. EIO An I/O error occurred while reading from or writing to the file system. ENOMEM Insufficient kernel memory was available. ENOSYS The filesystem path is on does not support statfs. For fstatfs: EBADF fd is not a valid open file descriptor. EFAULT buf points to an invalid address. EIO An I/O error occurred while reading from or writing to the file system. ENOSYS The filesystem fd is open on does not support statfs. CONFORMING TO
The Linux statfs was inspired by the 4.4BSD one (but they do not use the same structure). SEE ALSO
stat(2) Linux 2.0.30 1997-08-21 STATFS(2)
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