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Full Discussion: Underutilization of Linux memory
Operating Systems Linux Underutilization of Linux memory Post 303044159 by veeresh_15 on Sunday 16th of February 2020 12:51:53 AM
Old 02-16-2020
Underutilization of Linux memory
Hi All,

We are running a python application on an RHEL 7 VM machine hosted in Azure. Machine has 8GB of memory & 2GB of swap space configured as swap file. Below the output of free command from the server.

Code:
#-> free -h
              total        used        free      shared  buff/cache   available
Mem:           7.8G        3.4G        582M        381M        3.8G        3.6G
Swap:          2.0G        2.0G          0B

Here is the output of top command with list of top processing

Code:
top - 11:58:22 up 104 days,  2:40,  2 users,  load average: 1.03, 0.78, 0.91
Tasks: 205 total,   1 running, 203 sleeping,   0 stopped,   1 zombie
%Cpu(s): 24.5 us,  2.0 sy,  0.0 ni, 73.3 id,  0.0 wa,  0.0 hi,  0.2 si,  0.0 st
KiB Mem :  8157308 total,   605732 free,  3562428 used,  3989148 buff/cache
KiB Swap:  2097148 total,        0 free,  2097148 used.  3789188 avail Mem

  SWAP    PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
 97076  77330 root      20   0  728384  75128   2556 S   0.0  0.9 279:47.05 /app/xbot_venv/bin/python /app/xbot_worke+
 93040  77334 root      20   0  747624  92296   2556 S   0.0  1.1 348:13.00 /app/xbot_venv/bin/python /app/xbot_worke+
 90964  77318 root      20   0  732748  92008   2556 S   0.0  1.1 278:46.58 /app/xbot_venv/bin/python /app/xbot_worke+
 90916  77314 root      20   0  742220  48488   2556 S   0.0  0.6 157:59.16 /app/xbot_venv/bin/python /app/xbot_worke+
 90708  77312 root      20   0  801544 126112   2556 S   0.0  1.5 412:10.42 /app/xbot_venv/bin/python /app/xbot_worke+
 88384  77309 root      20   0  809980 177044   2556 S   0.0  2.2 546:48.45 /app/xbot_venv/bin/python /app/xbot_worke+
 85624  77319 root      20   0  739172  96352   2556 S   0.0  1.2 298:26.25 /app/xbot_venv/bin/python /app/xbot_worke+
 84780  77325 root      20   0  676940  47644   2556 S   0.0  0.6 157:53.64 /app/xbot_venv/bin/python /app/xbot_worke+
 83444  77306 root      20   0  735792  93004   2556 S   0.0  1.1 282:51.07 /app/xbot_venv/bin/python /app/xbot_worke+
 83120  77320 root      20   0  667980  42984   2556 S   0.0  0.5 157:30.00 /app/xbot_venv/bin/python /app/xbot_worke+
 81536  77322 root      20   0  730912  89452   2556 S   0.0  1.1 280:43.66 /app/xbot_venv/bin/python /app/xbot_worke+
 80504  77311 root      20   0  666956  39956   2556 S   0.0  0.5 156:57.16 /app/xbot_venv/bin/python /app/xbot_worke+
 79392  77323 root      20   0  666444  33728   2556 S   0.0  0.4 156:03.71 /app/xbot_venv/bin/python /app/xbot_worke+
 77804  77300 root      20   0  723180  92972   2556 S   0.0  1.1 610:43.01 /app/xbot_venv/bin/python /app/xbot_worke+
 76852  77305 root      20   0  813904 152728   2556 S   0.0  1.9 546:59.20 /app/xbot_venv/bin/python /app/xbot_worke+
 75864  77307 root      20   0  661824  41188   2556 S   0.0  0.5 157:21.67 /app/xbot_venv/bin/python /app/xbot_worke+

All of them are python processes eating up whole of swap space. Whats puzzling for me is that memory is under utilized and swap is 100% utilized. We are planning to increase the swap space to 8 GB to see if system resources(memory) are optimally utilized.

I would like to understand this behavior in depth. Why is swap space getting consumed first than memory. What needs to be done for making the system performance better?

Regards,
Veeresh

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Last edited by RavinderSingh13; 02-16-2020 at 03:01 AM..
 

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