01-13-2011
shmget failed - cannot allocate memory
Hi,
In my proj, one process was running for 2 days. after 2 days its throwing an error message "shmget failed cannot allocate memory". the same problem happened every time.i.e. i can reproduce the same issue if my process is running for every 2 days for a same operation.Within this 2 days there are 2500 operation were completed. after ~2500 operation this problem occured every time.once it thrown an error from then on(from the next operation) the same error was thrown continuosously.
my process name is Server.
the top command output for my process at the time when the problem occured.
=======================================================
top - 01:14:10 up 6 days, 1:23, 7 users, load average: 0.99, 1.03, 1.12
Tasks: 1 total, 0 running, 1 sleeping, 0 stopped, 0 zombie
Cpu(s): 26.5%us, 1.4%sy, 0.0%ni, 71.9%id, 0.0%wa, 0.2%hi, 0.1%si, 0.0%st
Mem: 4055852k total, 4025864k used, 29988k free, buffers
Swap: 4200444k total, 4200408k used, 36k free, 512380k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
24403 root 20 0 2904m 1.0g 3228 S 0 25.7 162:28.16 Server
=======================================================
RAM size is 4GB.
Is it because of memory leak? or for the 4GB memory it can be supported only 2500 operation?
free command output:
free -m
total used free shared buffers cached
Mem: 3960 3841 119 0 44 921
-/+ buffers/cache: 2874 1086
Swap: 4101 255 3846
Regards,
Mani
P.S: the top command output for the same process one day back:
top - 10:20:52 up 5 days, 10:29, 4 users, load average: 1.55, 1.51, 1.49
Tasks: 1 total, 0 running, 1 sleeping, 0 stopped, 0 zombie
Cpu(s): 26.6%us, 1.3%sy, 0.0%ni, 71.6%id, 0.3%wa, 0.1%hi, 0.1%si, 0.0%st
Mem: 4055852k total, 3980588k used, 75264k free, 16448k buffers
Swap: 4200444k total, 3580824k used, 619620k free, 661580k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
24403 root 20 0 2510m 999m 6164 S 0 25.2 140:05.11 Server
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SHMGET(2) BSD System Calls Manual SHMGET(2)
NAME
shmget -- get shared memory area identifier
SYNOPSIS
#include <sys/shm.h>
int
shmget(key_t key, size_t size, int shmflg);
DESCRIPTION
shmget() returns the shared memory identifier associated with the key key.
A shared memory segment is created if either key is equal to IPC_PRIVATE, or key does not have a shared memory segment identifier associated
with it, and the IPC_CREAT bit is set in shmflg.
If a new shared memory segment is created, the data structure associated with it (the shmid_ds structure, see shmctl(2)) is initialized as
follows:
o shm_perm.cuid and shm_perm.uid are set to the effective uid of the calling process.
o shm_perm.gid and shm_perm.cgid are set to the effective gid of the calling process.
o shm_perm.mode is set to the lower 9 bits of shmflg.
o shm_lpid, shm_nattch, shm_atime, and shm_dtime are set to 0
o shm_ctime is set to the current time.
o shm_segsz is set to the value of size.
o The ftok(3) function may be used to generate a key from a pathname.
RETURN VALUES
Upon successful completion a positive shared memory segment identifier is returned. Otherwise, -1 is returned and the global variable errno
is set to indicate the error.
ERRORS
The shmget() system call will fail if:
[EACCES] A shared memory segment is already associated with key and the caller has no permission to access it.
[EEXIST] Both IPC_CREAT and IPC_EXCL are set in shmflg, and a shared memory segment is already associated with key.
[EINVAL] No shared memory segment is to be created, and a shared memory segment exists for key, but the size of the segment associ-
ated with it is less than size, which is non-zero.
[ENOENT] IPC_CREAT was not set in shmflg and no shared memory segment associated with key was found.
[ENOMEM] There is not enough memory left to created a shared memory segment of the requested size.
[ENOSPC] A new shared memory identifier could not be created because the system limit for the number of shared memory identifiers
has been reached.
LEGACY SYNOPSIS
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
int
shmget(key_t key, int size, int shmflg);
All of these include files are necessary. The type of size has changed.
SEE ALSO
ftok(3), shmat(2), shmctl(2), shmdt(2), compat(5)
BSD
August 17, 1995 BSD