Memory not used any more but still allocated
I have something kind of weird going on with memory.
I have Ubuntu 14.04 servers with Zimbra 8.6 with kernel (for this one) 3.13.0-37-generic. But I have already seen the problem with other kernels.
Memory and swap are full :
$ free
total used free shared buffers cached
Mem: 6112624 5991208 121416 88 4752 79224
-/+ buffers/cache: 5907232 205392
Swap: 3905532 3624768 280764
I thought that Zimbra was eating all my memory but, strangely, it doesn't seems like it :
# ps -A --sort -rss -o comm,pmem | head -n 11
COMMAND %MEM
java 10.6
clamd 4.7
mysqld 3.0
java 2.0
slapd 1.2
/opt/zimbra/ama 1.1
/opt/zimbra/ama 1.0
/opt/zimbra/ama 1.0
/opt/zimbra/ama 1.0
/opt/zimbra/ama 0.9
All my process take like half of the memory. My buffers and cached take nearly nothing.
When I stop Zimbra, there is still 3.5Gb taken:
# ps -A --sort -rss -o comm,pmem | head -n 12
COMMAND %MEM
bash 0.0
bash 0.0
bash 0.0
sudo 0.0
rsyslogd 0.0
http 0.0
http 0.0
htop 0.0
init 0.0
ps 0.0
After a reboot, less than 200Mb was used.
Server was up for 139 days and memory use was growing bit by bit each day.
My question is then: what could have taken all the memory?
EDIT1, add some infos :
$ ls -l /dev/shm
lrwxrwxrwx 1 root root 8 mai 2 12:46 /dev/shm -> /run/shm
$ ipcs
------ Shared Memory Segments --------
key shmid owner perms bytes nattch status
------ Semaphore Arrays --------
key semid owner perms nsems
------ Message Queues --------
key msqid owner perms used-bytes messages
$ df
Filesystem 1K-blocks Used Available Use% Mounted on
udev 3051744 4 3051740 1% /dev
tmpfs 611260 496 610764 1% /run
/dev/sda2 14287344 2765996 10772548 21% /
none 4 0 4 0% /sys/fs/cgroup
none 5120 0 5120 0% /run/lock
none 3056288 0 3056288 0% /run/shm
none 102400 0 102400 0% /run/user
After reboot, (Zimbra started) :
$ free
total used free shared buffers cached
Mem: 6112576 5712908 399668 832 237892 1829424
-/+ buffers/cache: 3645592 2466984
Swap: 3905532 0 3905532
Some graphs of the RAM (I restarted the server around 12:30) :
Second graph shows results of :
ps aux |awk '{s+=$4} END {print s}'
And third, results of :
smem -tw |grep -v Area | sed 's/ //;s/ //'
linux memory
asked May 2 '16 at 10:54
ouzmoutousouzmoutous
1213
add a comment |
I have something kind of weird going on with memory.
I have Ubuntu 14.04 servers with Zimbra 8.6 with kernel (for this one) 3.13.0-37-generic. But I have already seen the problem with other kernels.
Memory and swap are full :
$ free
total used free shared buffers cached
Mem: 6112624 5991208 121416 88 4752 79224
-/+ buffers/cache: 5907232 205392
Swap: 3905532 3624768 280764
I thought that Zimbra was eating all my memory but, strangely, it doesn't seems like it :
# ps -A --sort -rss -o comm,pmem | head -n 11
COMMAND %MEM
java 10.6
clamd 4.7
mysqld 3.0
java 2.0
slapd 1.2
/opt/zimbra/ama 1.1
/opt/zimbra/ama 1.0
/opt/zimbra/ama 1.0
/opt/zimbra/ama 1.0
/opt/zimbra/ama 0.9
All my process take like half of the memory. My buffers and cached take nearly nothing.
When I stop Zimbra, there is still 3.5Gb taken:
# ps -A --sort -rss -o comm,pmem | head -n 12
COMMAND %MEM
bash 0.0
bash 0.0
bash 0.0
sudo 0.0
rsyslogd 0.0
http 0.0
http 0.0
htop 0.0
init 0.0
ps 0.0
After a reboot, less than 200Mb was used.
Server was up for 139 days and memory use was growing bit by bit each day.
My question is then: what could have taken all the memory?
EDIT1, add some infos :
$ ls -l /dev/shm
lrwxrwxrwx 1 root root 8 mai 2 12:46 /dev/shm -> /run/shm
$ ipcs
------ Shared Memory Segments --------
key shmid owner perms bytes nattch status
------ Semaphore Arrays --------
key semid owner perms nsems
------ Message Queues --------
key msqid owner perms used-bytes messages
$ df
Filesystem 1K-blocks Used Available Use% Mounted on
udev 3051744 4 3051740 1% /dev
tmpfs 611260 496 610764 1% /run
/dev/sda2 14287344 2765996 10772548 21% /
none 4 0 4 0% /sys/fs/cgroup
none 5120 0 5120 0% /run/lock
none 3056288 0 3056288 0% /run/shm
none 102400 0 102400 0% /run/user
After reboot, (Zimbra started) :
$ free
total used free shared buffers cached
Mem: 6112576 5712908 399668 832 237892 1829424
-/+ buffers/cache: 3645592 2466984
Swap: 3905532 0 3905532
Some graphs of the RAM (I restarted the server around 12:30) :
Second graph shows results of :
ps aux |awk '{s+=$4} END {print s}'
And third, results of :
smem -tw |grep -v Area | sed 's/ //;s/ //'
linux memory
asked May 2 '16 at 10:54
ouzmoutousouzmoutous
1213
Any shared memory (or similar) used? (ipcs,ls -l /dev/shm, size of tmpfs file systems, ...)
– Mat
May 2 '16 at 12:18
Could you please providefreeoutput in a couple of minutes after the moment when Zimbra is stopped and system is still using a log of memory?
– rush
May 2 '16 at 12:31
@Mat, I added some infos.
– ouzmoutous
May 2 '16 at 15:42
@rush, I did not save this info, but my htop was green for 3.5Go. It's like some process doesn't "unallocate" the memory
– ouzmoutous
May 2 '16 at 15:44
add a comment |
I have something kind of weird going on with memory.
I have Ubuntu 14.04 servers with Zimbra 8.6 with kernel (for this one) 3.13.0-37-generic. But I have already seen the problem with other kernels.
Memory and swap are full :
$ free
total used free shared buffers cached
Mem: 6112624 5991208 121416 88 4752 79224
-/+ buffers/cache: 5907232 205392
Swap: 3905532 3624768 280764
I thought that Zimbra was eating all my memory but, strangely, it doesn't seems like it :
# ps -A --sort -rss -o comm,pmem | head -n 11
COMMAND %MEM
java 10.6
clamd 4.7
mysqld 3.0
java 2.0
slapd 1.2
/opt/zimbra/ama 1.1
/opt/zimbra/ama 1.0
/opt/zimbra/ama 1.0
/opt/zimbra/ama 1.0
/opt/zimbra/ama 0.9
All my process take like half of the memory. My buffers and cached take nearly nothing.
When I stop Zimbra, there is still 3.5Gb taken:
# ps -A --sort -rss -o comm,pmem | head -n 12
COMMAND %MEM
bash 0.0
bash 0.0
bash 0.0
sudo 0.0
rsyslogd 0.0
http 0.0
http 0.0
htop 0.0
init 0.0
ps 0.0
After a reboot, less than 200Mb was used.
Server was up for 139 days and memory use was growing bit by bit each day.
My question is then: what could have taken all the memory?
EDIT1, add some infos :
$ ls -l /dev/shm
lrwxrwxrwx 1 root root 8 mai 2 12:46 /dev/shm -> /run/shm
$ ipcs
------ Shared Memory Segments --------
key shmid owner perms bytes nattch status
------ Semaphore Arrays --------
key semid owner perms nsems
------ Message Queues --------
key msqid owner perms used-bytes messages
$ df
Filesystem 1K-blocks Used Available Use% Mounted on
udev 3051744 4 3051740 1% /dev
tmpfs 611260 496 610764 1% /run
/dev/sda2 14287344 2765996 10772548 21% /
none 4 0 4 0% /sys/fs/cgroup
none 5120 0 5120 0% /run/lock
none 3056288 0 3056288 0% /run/shm
none 102400 0 102400 0% /run/user
After reboot, (Zimbra started) :
$ free
total used free shared buffers cached
Mem: 6112576 5712908 399668 832 237892 1829424
-/+ buffers/cache: 3645592 2466984
Swap: 3905532 0 3905532
Some graphs of the RAM (I restarted the server around 12:30) :
Second graph shows results of :
ps aux |awk '{s+=$4} END {print s}'
And third, results of :
smem -tw |grep -v Area | sed 's/ //;s/ //'
linux memory
asked May 2 '16 at 10:54
ouzmoutousouzmoutous
1213
I have something kind of weird going on with memory.
I have Ubuntu 14.04 servers with Zimbra 8.6 with kernel (for this one) 3.13.0-37-generic. But I have already seen the problem with other kernels.
Memory and swap are full :
$ free
total used free shared buffers cached
Mem: 6112624 5991208 121416 88 4752 79224
-/+ buffers/cache: 5907232 205392
Swap: 3905532 3624768 280764
I thought that Zimbra was eating all my memory but, strangely, it doesn't seems like it :
# ps -A --sort -rss -o comm,pmem | head -n 11
COMMAND %MEM
java 10.6
clamd 4.7
mysqld 3.0
java 2.0
slapd 1.2
/opt/zimbra/ama 1.1
/opt/zimbra/ama 1.0
/opt/zimbra/ama 1.0
/opt/zimbra/ama 1.0
/opt/zimbra/ama 0.9
All my process take like half of the memory. My buffers and cached take nearly nothing.
When I stop Zimbra, there is still 3.5Gb taken:
# ps -A --sort -rss -o comm,pmem | head -n 12
COMMAND %MEM
bash 0.0
bash 0.0
bash 0.0
sudo 0.0
rsyslogd 0.0
http 0.0
http 0.0
htop 0.0
init 0.0
ps 0.0
After a reboot, less than 200Mb was used.
Server was up for 139 days and memory use was growing bit by bit each day.
My question is then: what could have taken all the memory?
EDIT1, add some infos :
$ ls -l /dev/shm
lrwxrwxrwx 1 root root 8 mai 2 12:46 /dev/shm -> /run/shm
$ ipcs
------ Shared Memory Segments --------
key shmid owner perms bytes nattch status
------ Semaphore Arrays --------
key semid owner perms nsems
------ Message Queues --------
key msqid owner perms used-bytes messages
$ df
Filesystem 1K-blocks Used Available Use% Mounted on
udev 3051744 4 3051740 1% /dev
tmpfs 611260 496 610764 1% /run
/dev/sda2 14287344 2765996 10772548 21% /
none 4 0 4 0% /sys/fs/cgroup
none 5120 0 5120 0% /run/lock
none 3056288 0 3056288 0% /run/shm
none 102400 0 102400 0% /run/user
After reboot, (Zimbra started) :
$ free
total used free shared buffers cached
Mem: 6112576 5712908 399668 832 237892 1829424
-/+ buffers/cache: 3645592 2466984
Swap: 3905532 0 3905532
Some graphs of the RAM (I restarted the server around 12:30) :
Second graph shows results of :
ps aux |awk '{s+=$4} END {print s}'
And third, results of :
smem -tw |grep -v Area | sed 's/ //;s/ //'
linux memory
linux memory
asked May 2 '16 at 10:54
ouzmoutousouzmoutous
1213
asked May 2 '16 at 10:54
ouzmoutousouzmoutous
1213
edited May 2 '16 at 15:41
ouzmoutous
asked May 2 '16 at 10:54
ouzmoutousouzmoutous
1213
asked May 2 '16 at 10:54
ouzmoutousouzmoutous
1213
asked May 2 '16 at 10:54
ouzmoutousouzmoutous
1213
1213
Any shared memory (or similar) used? (ipcs,ls -l /dev/shm, size of tmpfs file systems, ...)
– Mat
May 2 '16 at 12:18
Could you please providefreeoutput in a couple of minutes after the moment when Zimbra is stopped and system is still using a log of memory?
– rush
May 2 '16 at 12:31
@Mat, I added some infos.
– ouzmoutous
May 2 '16 at 15:42
@rush, I did not save this info, but my htop was green for 3.5Go. It's like some process doesn't "unallocate" the memory
– ouzmoutous
May 2 '16 at 15:44
add a comment |
Any shared memory (or similar) used? (ipcs,ls -l /dev/shm, size of tmpfs file systems, ...)
– Mat
May 2 '16 at 12:18
Could you please providefreeoutput in a couple of minutes after the moment when Zimbra is stopped and system is still using a log of memory?
– rush
May 2 '16 at 12:31
@Mat, I added some infos.
– ouzmoutous
May 2 '16 at 15:42
@rush, I did not save this info, but my htop was green for 3.5Go. It's like some process doesn't "unallocate" the memory
– ouzmoutous
May 2 '16 at 15:44
Any shared memory (or similar) used? (
ipcs, ls -l /dev/shm, size of tmpfs file systems, ...)– Mat
May 2 '16 at 12:18
Any shared memory (or similar) used? (
ipcs, ls -l /dev/shm, size of tmpfs file systems, ...)– Mat
May 2 '16 at 12:18
Could you please provide
free output in a couple of minutes after the moment when Zimbra is stopped and system is still using a log of memory?– rush
May 2 '16 at 12:31
Could you please provide
free output in a couple of minutes after the moment when Zimbra is stopped and system is still using a log of memory?– rush
May 2 '16 at 12:31
@Mat, I added some infos.
– ouzmoutous
May 2 '16 at 15:42
@Mat, I added some infos.
– ouzmoutous
May 2 '16 at 15:42
@rush, I did not save this info, but my htop was green for 3.5Go. It's like some process doesn't "unallocate" the memory
– ouzmoutous
May 2 '16 at 15:44
@rush, I did not save this info, but my htop was green for 3.5Go. It's like some process doesn't "unallocate" the memory
– ouzmoutous
May 2 '16 at 15:44
add a comment |
1 Answer
1
active
oldest
votes
Cache.
A good summary at http://www.linuxatemyram.com/.
Linux is borrowing unused memory for disk caching. This makes it looks
like you are low on memory, but you are not! Everything is fine!
To clear the caches use this command, as root, and then observe resulting memory usage.
echo 3 > /proc/sys/vm/drop_caches
answered May 2 '16 at 11:16
stevesteve
14k22452
1
Look at the output offreegiven in the question: it only shows ~80MB in the cache and disk buffers.
– Stephen Kitt
May 2 '16 at 11:35
I clear cache (1,2 and 3). So it was not the reason :S
– ouzmoutous
May 2 '16 at 11:52
add a comment |
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "106"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f280553%2fmemory-not-used-any-more-but-still-allocated%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Cache.
A good summary at http://www.linuxatemyram.com/.
Linux is borrowing unused memory for disk caching. This makes it looks
like you are low on memory, but you are not! Everything is fine!
To clear the caches use this command, as root, and then observe resulting memory usage.
echo 3 > /proc/sys/vm/drop_caches
answered May 2 '16 at 11:16
stevesteve
14k22452
1
Look at the output offreegiven in the question: it only shows ~80MB in the cache and disk buffers.
– Stephen Kitt
May 2 '16 at 11:35
I clear cache (1,2 and 3). So it was not the reason :S
– ouzmoutous
May 2 '16 at 11:52
add a comment |
Cache.
A good summary at http://www.linuxatemyram.com/.
Linux is borrowing unused memory for disk caching. This makes it looks
like you are low on memory, but you are not! Everything is fine!
To clear the caches use this command, as root, and then observe resulting memory usage.
echo 3 > /proc/sys/vm/drop_caches
answered May 2 '16 at 11:16
stevesteve
14k22452
1
Look at the output offreegiven in the question: it only shows ~80MB in the cache and disk buffers.
– Stephen Kitt
May 2 '16 at 11:35
I clear cache (1,2 and 3). So it was not the reason :S
– ouzmoutous
May 2 '16 at 11:52
add a comment |
Cache.
A good summary at http://www.linuxatemyram.com/.
Linux is borrowing unused memory for disk caching. This makes it looks
like you are low on memory, but you are not! Everything is fine!
To clear the caches use this command, as root, and then observe resulting memory usage.
echo 3 > /proc/sys/vm/drop_caches
answered May 2 '16 at 11:16
stevesteve
14k22452
Cache.
A good summary at http://www.linuxatemyram.com/.
Linux is borrowing unused memory for disk caching. This makes it looks
like you are low on memory, but you are not! Everything is fine!
To clear the caches use this command, as root, and then observe resulting memory usage.
echo 3 > /proc/sys/vm/drop_caches
answered May 2 '16 at 11:16
stevesteve
14k22452
answered May 2 '16 at 11:16
stevesteve
14k22452
answered May 2 '16 at 11:16
stevesteve
14k22452
answered May 2 '16 at 11:16
stevesteve
14k22452
14k22452
1
Look at the output offreegiven in the question: it only shows ~80MB in the cache and disk buffers.
– Stephen Kitt
May 2 '16 at 11:35
I clear cache (1,2 and 3). So it was not the reason :S
– ouzmoutous
May 2 '16 at 11:52
add a comment |
1
Look at the output offreegiven in the question: it only shows ~80MB in the cache and disk buffers.
– Stephen Kitt
May 2 '16 at 11:35
I clear cache (1,2 and 3). So it was not the reason :S
– ouzmoutous
May 2 '16 at 11:52
1
1
Look at the output of
free given in the question: it only shows ~80MB in the cache and disk buffers.– Stephen Kitt
May 2 '16 at 11:35
Look at the output of
free given in the question: it only shows ~80MB in the cache and disk buffers.– Stephen Kitt
May 2 '16 at 11:35
I clear cache (1,2 and 3). So it was not the reason :S
– ouzmoutous
May 2 '16 at 11:52
I clear cache (1,2 and 3). So it was not the reason :S
– ouzmoutous
May 2 '16 at 11:52
add a comment |
Thanks for contributing an answer to Unix & Linux Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f280553%2fmemory-not-used-any-more-but-still-allocated%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Any shared memory (or similar) used? (
ipcs,ls -l /dev/shm, size of tmpfs file systems, ...)– Mat
May 2 '16 at 12:18
Could you please provide
freeoutput in a couple of minutes after the moment when Zimbra is stopped and system is still using a log of memory?– rush
May 2 '16 at 12:31
@Mat, I added some infos.
– ouzmoutous
May 2 '16 at 15:42
@rush, I did not save this info, but my htop was green for 3.5Go. It's like some process doesn't "unallocate" the memory
– ouzmoutous
May 2 '16 at 15:44