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Operating Systems Linux Red Hat Memory leak
# 8  
Old 05-30-2011
i am new in linux, so pls guide me what is it. i have more other boxes but it not uses like this. pls tell me what to do next...
# 9  
Old 05-30-2011
Cache is cache. Whenever linux uses the disk it stuffs disk contents into memory in case it needs them again. It gives them up as easily as free memory.

As for what's going wrong, tell us exactly what problem you're having with the system.
# 10  
Old 05-30-2011
exactly problem is i have 12 Red hat servers. all the servers consuming 20% of memory except this one its use more than 95 % of memory. its working also slow compare other rest servers. it always use 95%, 96% of memory. when i use command "sync ; echo 3 > /proc/sys/vm/drop_cache". then it release the memory and after 2,3 hours it will again use full memory. why it happen
pls reply
# 11  
Old 05-30-2011
Quote:
Originally Posted by reply.ravi
exactly problem is i have 12 Red hat servers. all the servers consuming 20% of memory except this one its use more than 95 % of memory.
We've already been over this. You just had the usual "oh my god linux uses free memory as cache" newbie freakout. Lots of memory being cached is completely normal, even expected behavior. If none of your other servers have any memory used as cache, they are the ones that have something wrong with them. Cache is good. Cache makes your system faster. Cache is also still "free" memory that your server will give up and hand over to programs should they ask for it.

Stop freaking out. Stop messing around with your VM modes -- disabling cache hurts your systems -- and undo the changes you did. (If you don't know how, just reboot your system.)

Quote:
also slow compare other rest servers.
This problem is completely unrelated to memory. It has 6 gigabytes of free memory. You don't have to keep prodding at VM modes. The memory's fine, or was until you started messing with it.

What, exactly, is slow? Forget the memory already and tell us what performance problems you're having. What's your load average?
# 12  
Old 05-30-2011
the load average is
Code:
#uptime
 22:44:16 up 21 days, 17:04,  1 user,  load average: 1.05, 1.08, 1.03

Last edited by Scott; 05-30-2011 at 03:11 PM.. Reason: Code tags
# 13  
Old 05-30-2011
Something's occupying one core 100% of the time. Run top to see what it is.

Also:

Quote:
Originally Posted by Corona688
What, exactly, is slow? Forget the memory already and tell us what performance problems you're having.
# 14  
Old 05-30-2011
Code:
top - 22:58:11 up 21 days, 17:18,  1 user,  load average: 1.00, 1.00, 1.00
Tasks: 246 total,   2 running, 244 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   7805952k total,  7682840k used,   123112k free,   301988k buffers
Swap: 16892336k total,      184k used, 16892152k free,  6485460k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
    1 root      15   0 10348  692  584 S  0.0  0.0   0:01.61 init
    2 root      RT  -5     0    0    0 S  0.0  0.0   0:01.02 migration/0
    3 root      34  19     0    0    0 S  0.0  0.0   0:00.14 ksoftirqd/0
    4 root      RT  -5     0    0    0 S  0.0  0.0   0:00.00 watchdog/0
    5 root      RT  -5     0    0    0 S  0.0  0.0   0:00.81 migration/1
    6 root      34  19     0    0    0 S  0.0  0.0   0:00.05 ksoftirqd/1
    7 root      RT  -5     0    0    0 S  0.0  0.0   0:00.00 watchdog/1
    8 root      RT  -5     0    0    0 S  0.0  0.0   0:01.03 migration/2
    9 root      34  19     0    0    0 S  0.0  0.0   0:00.05 ksoftirqd/2
   10 root      RT  -5     0    0    0 S  0.0  0.0   0:00.00 watchdog/2
   11 root      RT  -5     0    0    0 S  0.0  0.0   0:01.02 migration/3
   12 root      34  19     0    0    0 S  0.0  0.0   0:00.05 ksoftirqd/3
   13 root      RT  -5     0    0    0 S  0.0  0.0   0:00.00 watchdog/3
   14 root      RT  -5     0    0    0 S  0.0  0.0   0:01.06 migration/4
   15 root      34  19     0    0    0 S  0.0  0.0   0:00.01 ksoftirqd/4
   16 root      RT  -5     0    0    0 S  0.0  0.0   0:00.00 watchdog/4
   17 root      RT  -5     0    0    0 S  0.0  0.0   0:00.74 migration/5
   18 root      34  19     0    0    0 S  0.0  0.0   0:00.00 ksoftirqd/5
   19 root      RT  -5     0    0    0 S  0.0  0.0   0:00.00 watchdog/5
   20 root      RT  -5     0    0    0 S  0.0  0.0   0:00.62 migration/6
   21 root      34  19     0    0    0 S  0.0  0.0   0:00.01 ksoftirqd/6
   22 root      RT  -5     0    0    0 S  0.0  0.0   0:00.00 watchdog/6
   23 root      RT  -5     0    0    0 S  0.0  0.0   0:00.94 migration/7
   24 root      34  19     0    0    0 S  0.0  0.0   0:00.11 ksoftirqd/7
   25 root      RT  -5     0    0    0 S  0.0  0.0   0:00.00 watchdog/7
   26 root      10  -5     0    0    0 S  0.0  0.0   0:00.01 events/0
   27 root      10  -5     0    0    0 S  0.0  0.0   0:00.00 events/1
   28 root      10  -5     0    0    0 S  0.0  0.0   0:00.00 events/2
   29 root      10  -5     0    0    0 S  0.0  0.0   0:00.00 events/3
   30 root      10  -5     0    0    0 S  0.0  0.0   0:00.00 events/4
   31 root      10  -5     0    0    0 S  0.0  0.0   0:00.00 events/5
   32 root      10  -5     0    0    0 S  0.0  0.0   0:00.00 events/6
   33 root      10  -5     0    0    0 S  0.0  0.0   0:00.00 events/7
   34 root      10  -5     0    0    0 S  0.0  0.0   0:00.00 khelper
   35 root      10  -5     0    0    0 S  0.0  0.0   0:00.00 kthread
   37 root      10  -5     0    0    0 S  0.0  0.0   0:00.00 xenwatch
   38 root      10  -5     0    0    0 S  0.0  0.0   0:00.00 xenbus

Last edited by Scott; 05-30-2011 at 03:12 PM.. Reason: Code tags
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