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Top Forums Shell Programming and Scripting How to clean memory after command run? Post 302894980 by postcd on Friday 28th of March 2014 07:36:51 AM
Old 03-28-2014
How to clean memory after command run?

Hello, i have an loop (while) in bash and i seen after a while sctipt returned like:

Code:
wget: error while loading shared libraries: libselinux.so.1: failed to map segment from shared object: Cannot allocate memory
wget: error while loading shared libraries: libcrypto.so.6: failed to map segment from shared object: Cannot allocate memory
./wgetter: fork: Cannot allocate memory

So i want to ask which command i need to use to reclaim memory used by some command in loop, it appears like this loop causes memory to fill?

so far i found:
clean up memory on linux | commandlinefu.com
https://gist.github.com/pklaus/837023

but not sure if any of these are good to use, the second one is a big script, probably not handy for a loop..

Last edited by postcd; 03-28-2014 at 08:37 PM..
 

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SHMAT(2)						      BSD System Calls Manual							  SHMAT(2)

NAME
shmat, shmdt -- map/unmap shared memory SYNOPSIS
#include <sys/shm.h> void * shmat(int shmid, const void *shmaddr, int shmflg); int shmdt(const void *shmaddr); DESCRIPTION
shmat() maps the shared memory segment associated with the shared memory identifier shmid into the address space of the calling process. The address at which the segment is mapped is determined by the shmaddr parameter. If it is equal to 0, the system will pick an address itself. Otherwise, an attempt is made to map the shared memory segment at the address shmaddr specifies. If SHM_RND is set in shmflg, the system will round the address down to a multiple of SHMLBA bytes (SHMLBA is defined in <sys/shm.h> ). A shared memory segment can be mapped read-only by specifying the SHM_RDONLY flag in shmflg. shmdt() unmaps the shared memory segment that is currently mapped at shmaddr from the calling process' address space. shmaddr must be a value returned by a prior shmat() call. A shared memory segment will remain existant until it is removed by a call to shmctl(2) with the IPC_RMID command. RETURN VALUES
shmat() returns the address at which the shared memory segment has been mapped into the calling process' address space when successful, shmdt() returns 0 on successful completion. Otherwise, a value of -1 is returned, and the global variable errno is set to indicate the error. ERRORS
The shmat() system call will fail if: [EACCES] The calling process has no permission to access this shared memory segment. [EINVAL] shmid is not a valid shared memory identifier. shmaddr specifies an illegal address. [EMFILE] The number of shared memory segments has reached the system-wide limit. [ENOMEM] There is not enough available data space for the calling process to map the shared memory segment. The shmdt() system call will fail if: [EINVAL] shmaddr is not the start address of a mapped shared memory segment. LEGACY SYNOPSIS
#include <sys/types.h> #include <sys/ipc.h> #include <sys/shm.h> The include files <sys/types.h> and <sys/ipc.h> are necessary for both functions. SEE ALSO
mmap(2), shmctl(2), shmget(2), compat(5) BSD
August 17, 1995 BSD

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