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###EDIT

EDIT

###EDIT

cat /proc/meminfo on machine 1 (low memory):

MemTotal:       10257656 kB
MemFree:          395840 kB
MemAvailable:    1428508 kB
Buffers:          162640 kB
Cached:          1173040 kB
SwapCached:          176 kB
Active:          1810200 kB
Inactive:         476668 kB
Active(anon):     942816 kB
Inactive(anon):   176184 kB
Active(file):     867384 kB
Inactive(file):   300484 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:       1951740 kB
SwapFree:        1951528 kB
Dirty:                16 kB
Writeback:             0 kB
AnonPages:        951016 kB
Mapped:           224388 kB
Shmem:            167820 kB
Slab:              86464 kB
SReclaimable:      67488 kB
SUnreclaim:        18976 kB
KernelStack:        6736 kB
PageTables:        13728 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     7080568 kB
Committed_AS:    1893156 kB
VmallocTotal:   34359738367 kB
VmallocUsed:       62284 kB
VmallocChunk:   34359672552 kB
HardwareCorrupted:     0 kB
AnonHugePages:         0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:       67520 kB
DirectMap2M:    10418176 kB

cat /proc/meminfo on machine 2 (normal memory usage):

MemTotal:       12326128 kB
MemFree:         8895188 kB
MemAvailable:   10947592 kB
Buffers:          191548 kB
Cached:          2188088 kB
SwapCached:            0 kB
Active:          2890128 kB
Inactive:         350360 kB
Active(anon):    1018116 kB
Inactive(anon):    33320 kB
Active(file):    1872012 kB
Inactive(file):   317040 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:       3442684 kB
SwapFree:        3442684 kB
Dirty:                44 kB
Writeback:             0 kB
AnonPages:        860880 kB
Mapped:           204680 kB
Shmem:            190588 kB
Slab:              86812 kB
SReclaimable:      64556 kB
SUnreclaim:        22256 kB
KernelStack:       10576 kB
PageTables:        11924 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     9605748 kB
Committed_AS:    1753476 kB
VmallocTotal:   34359738367 kB
VmallocUsed:       62708 kB
VmallocChunk:   34359671804 kB
HardwareCorrupted:     0 kB
AnonHugePages:         0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:       63424 kB
DirectMap2M:    12519424 kB

I run free -m:

             total       used       free     shared    buffers     cached
Mem:         10017       9475        541        147         34        909
-/+ buffers/cache:       8531       1485
Swap:         1905          0       1905

So out of my 10GB of memory, 8.5GB is in use and only 1500MB is free (excluding cache).

But I struggle to find what is using the memory. The output of ps aux | awk '{sum+=$6} END {print sum / 1024}', which is supposed to add up the RSS utilisation is:

1005.2

In other words, my processes only use 1GB of memory but the system as a whole (excluding cache) uses 8.5GB.

What could be using the other 7.5GB?

ps: I have another server with a similar configuration that shows used mem of 1200 (free mem = 8.8GB) and the sum of RSS usage in ps is 900 which is closer to what I would expect...

I run free -m on a debian VM running on Hyper-V:

             total       used       free     shared    buffers     cached
Mem:         10017       9475        541        147         34        909
-/+ buffers/cache:       8531       1485
Swap:         1905          0       1905

So out of my 10GB of memory, 8.5GB is in use and only 1500MB is free (excluding cache).

But I struggle to find what is using the memory. The output of ps aux | awk '{sum+=$6} END {print sum / 1024}', which is supposed to add up the RSS utilisation is:

1005.2

In other words, my processes only use 1GB of memory but the system as a whole (excluding cache) uses 8.5GB.

What could be using the other 7.5GB?

ps: I have another server with a similar configuration that shows used mem of 1200 (free mem = 8.8GB) and the sum of RSS usage in ps is 900 which is closer to what I would expect...