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
Output of the
#cat /proc/sys/kernel/shmmax
18446744073709551615
#cat /proc/sys/kernel/shmmni
4096
#cat /proc/sys/kernel/shmall
1152921504606846720
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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FREE(1) User Commands FREE(1)
NAME
free - Display amount of free and used memory in the system
SYNOPSIS
free [options]
DESCRIPTION
free displays the total amount of free and used physical and swap memory in the system, as well as the buffers and caches used by the ker-
nel. The information is gathered by parsing /proc/meminfo. The displayed columns are:
total Total installed memory (MemTotal and SwapTotal in /proc/meminfo)
used Used memory (calculated as total - free - buffers - cache)
free Unused memory (MemFree and SwapFree in /proc/meminfo)
shared Memory used (mostly) by tmpfs (Shmem in /proc/meminfo)
buffers
Memory used by kernel buffers (Buffers in /proc/meminfo)
cache Memory used by the page cache and slabs (Cached and SReclaimable in /proc/meminfo)
buff/cache
Sum of buffers and cache
available
Estimation of how much memory is available for starting new applications, without swapping. Unlike the data provided by the cache or
free fields, this field takes into account page cache and also that not all reclaimable memory slabs will be reclaimed due to items
being in use (MemAvailable in /proc/meminfo, available on kernels 3.14, emulated on kernels 2.6.27+, otherwise the same as free)
OPTIONS
-b, --bytes
Display the amount of memory in bytes.
-k, --kibi
Display the amount of memory in kibibytes. This is the default.
-m, --mebi
Display the amount of memory in mebibytes.
-g, --gibi
Display the amount of memory in gibibytes.
--tebi Display the amount of memory in tebibytes.
--pebi Display the amount of memory in pebibytes.
--kilo Display the amount of memory in kilobytes. Implies --si.
--mega Display the amount of memory in megabytes. Implies --si.
--giga Display the amount of memory in gigabytes. Implies --si.
--tera Display the amount of memory in terabytes. Implies --si.
--peta Display the amount of memory in petabytes. Implies --si.
-h, --human
Show all output fields automatically scaled to shortest three digit unit and display the units of print out. Following units are
used.
B = bytes
K = kibibyte
M = mebibyte
G = gibibyte
T = tebibyte
P = pebibyte
If unit is missing, and you have exbibyte of RAM or swap, the number is in tebibytes and columns might not be aligned with header.
-w, --wide
Switch to the wide mode. The wide mode produces lines longer than 80 characters. In this mode buffers and cache are reported in two
separate columns.
-c, --count count
Display the result count times. Requires the -s option.
-l, --lohi
Show detailed low and high memory statistics.
-s, --seconds delay
Continuously display the result delay seconds apart. You may actually specify any floating point number for delay using either .
or , for decimal point. usleep(3) is used for microsecond resolution delay times.
--si Use kilo, mega, giga etc (power of 1000) instead of kibi, mebi, gibi (power of 1024).
-t, --total
Display a line showing the column totals.
--help Print help.
-V, --version
Display version information.
FILES
/proc/meminfo
memory information
BUGS
The value for the shared column is not available from kernels before 2.6.32 and is displayed as zero.
Please send bug reports to
<procps@freelists.org>
SEE ALSO
ps(1), slabtop(1), top(1), vmstat(8).
procps-ng 2016-06-03 FREE(1)