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Claud_13959's avatar
Claud_13959
Icon for Nimbostratus rankNimbostratus
May 22, 2014

F5 memory usage

Just worried about high memory usage on my F5 8950, v11.1:

[root@f5:Active] config  tmsh show sys memory | head
Sys::System Memory Information
------------------------------------------------------------------
Memory Used(bytes)  Current  Average  Max(since 05/21/14 23:20:00)
------------------------------------------------------------------
Total Phys Memory     15.7G    15.7G                         15.7G
OS Used Memory        15.4G    15.4G                         15.4G
TMM Alloc Memory       8.2G     8.2G                          8.2G
TMM Used Memory      954.3M   924.8M                        954.8M

[root@f5:Active] config  free -m
             total       used       free     shared    buffers     cached
Mem:         16078      15844        233          0        567       4195
-/+ buffers/cache:      11081       4997
Swap:         1023          7       1016

The TMM shows low usage but the Linux OS shows only 233MB free out of 15.7GB.

Here is a top:

top - 02:45:07 up 451 days,  4:34,  5 users,  load average: 0.53, 0.34, 0.19
Tasks: 359 total,   4 running, 354 sleeping,   0 stopped,   1 zombie
Cpu(s):  7.3%us,  1.6%sy,  0.4%ni, 90.6%id,  0.2%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:  16464436k total, 16233548k used,   230888k free,   581124k buffers
Swap:  1048504k total,     7448k used,  1041056k free,  4302064k cached

 VIRT   PID USER      PR  NI  RES  SHR S %CPU %MEM    TIME+  COMMAND
1365m 15565 root      RT   0 126m 125m S 12.9  0.8 893:22.50 tmm
1365m 15566 root      RT   0 126m 125m S 10.6  0.8 717:47.65 tmm
1365m 15567 root      RT   0 126m 125m S  8.9  0.8 810:56.81 tmm
1365m 15568 root      RT   0 126m 125m R  7.3  0.8 955:00.22 tmm
1365m 15569 root      RT   0 126m 125m S  6.3  0.8 723:16.05 tmm
1365m 15570 root      RT   0 126m 125m S  6.6  0.8 768:51.00 tmm
1365m 15571 root      RT   0 126m 125m S  6.0  0.8 606:04.78 tmm
1365m 15572 root      RT   0 126m 125m S  7.6  0.8 621:15.98 tmm
 445m  8188 mysql     20   0  66m 5468 S  0.0  0.4 125:29.68 mysqld
 301m  8313 tomcat    20   0 251m 3016 S  0.0  1.6 302:25.53 java
 181m 16014 root      20   0  30m  15m S  0.0  0.2   1:46.32 eam
 171m  6643 root      20   0  39m 4036 S  0.0  0.2  80:17.65 java
 138m  6450 root      20   0  97m 9.9m S  0.3  0.6   3022:29 mcpd
 134m 15828 root      20   0  36m  18m S  0.0  0.2   4:04.94 apd
 134m  5694 root      20   0  29m  11m S  0.7  0.2   4169:52 md
 124m 16124 root      20   0 4676 3228 S  0.0  0.0   0:01.41 dpid
 104m  6395 root      20   0  19m 9356 S  0.0  0.1   0:42.31 apmd
91992  6644 root      20   0  20m 7512 S  0.0  0.1 166:19.54 cbrd
87428  5750 root      20   0 9896 5788 S  0.0  0.1  28:12.64 chmand
80092  5646 root      20   0  15m 7476 S  0.0  0.1   5:09.39 monpd
75544 16263 root      20   0  23m  14m S  0.3  0.1  12:31.71 websso
75544 16292 root      20   0  23m  14m S  0.7  0.1  12:32.09 websso
75544 16349 root      20   0  23m  14m S  0.0  0.1  12:31.50 websso
74520 16169 root      20   0  23m  14m R  0.0  0.1  12:32.60 websso
74520 16276 root      20   0  23m  14m S  0.3  0.1  12:32.08 websso
74520 16305 root      20   0  23m  14m S  0.0  0.1  12:37.58 websso
74520 16319 root      20   0  23m  14m S  0.0  0.1  12:30.79 websso
74520 16333 root      20   0  23m  14m S  0.3  0.1  12:31.37 websso

Is this OK, or will the Linux OS run out of memory?

application delivery
deployment
LTM
oracle
performance
TMOS

3 Replies

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  • HHeredia_36237's avatar
    HHeredia_36237
    Icon for Nimbostratus rankNimbostratus
    May 22, 2014

    As long as i Know it's OK. Please note:

     

    TMM Alloc Memory 8.2G 8.2G 8.2G TMM Used Memory 954.3M 924.8M 954.8M

     

    TMM is using like 10-11% of it's allocated MEM.If this grows then you should be worried.

     

    It's important to know the controller is a 'compound' of various subsystems and that tmm is the one you have to take care of.

     

    However would be nice to wait for more comments on this because it's a very common issue among customers :)

     

    hheredia

     

  • What_Lies_Bene1's avatar
    What_Lies_Bene1
    Icon for Cirrostratus rankCirrostratus
    May 22, 2014

    Amazing that this is still a topic of discussion after all these years.

     

    First off, Claud, you may want to pull down my HMS book from here: https://www.wuala.com/sjiveson/Public/?key=BlKE7DHaCzCL to give you a better understanding of what the HMS is.

     

    This article of mine explains how the HMS fits into the wider TMOS architecture: http://packetpushers.net/what-the-heck-is-f5-networks-tmos/.

     

    Once you understand that, hopefully this will make sense;

     

    • Any non-tmsh command you use in the HMS bash shell (like free) will generally only relate to the HMS.
    • Top is one exception and will actually give you valid figures for CPU and memory (for the TMM processes), this is the only non-tmsh command you should rely upon.
    • To avoid confusion it's best to simply rely on tmsh commands.