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FWIW, depending on how the sum is used it might actually make even more
sense to use PSS, i.e., the proportional set size which better accounts
for shared memory by dividing that part between all its users, as if
e.g. 10 QEMU processes have 100 MB of shared code and what not in their
RSS, using RSS one would sum up 900 MB to much compared using PSS, but
what's the correct one here is then depending on how they result is
used.
@Stefan, as you checked this out, would you care checking out the VSS
vs. RSS vs. PSS matter too? I.e. checking what should make more sense to
use and actually testing that out in a somewhat defined workload.
yes, i think PSS looks better for summing up then RSS.
The ZFS ARC thing is something else and might be a bit more complicated,
so I'd focus first one above at that seems to provide better
improvements for less work, or at least with less potential to build an
unstable control system.
mind , that the patch from
https://www.mail-archive.com/pve-devel@lists.proxmox.com/msg02453.html
is not yet complete, imho.
shouldn't we also take arc_min into account , as this can't be
freed/reclaimed from arc ?
i have reworked the memory calculation routine from free_memory ()
little bit
root@s740:~# free
total used free shared buff/cache
available
Mem: 16165308 15489260 787056 30588 165628 676048
Swap: 0 0 0
root@s740:~# ./getfreemem.sh
Memfree: 763 MB
Buffers: 0 MB
Cached: 122 MB
arc_min: 493 MB
arc_size: 4732 MB
Free = Memfree + Buffers + Cached + arc_size - arc_min = 5124 MB
root@s740:~# arcstat
time read ddread ddh% dmread dmh% pread ph% size c avail
00:45:50 0 0 0 0 0 0 0 4.6G 4.7G 156M
#!/bin/bash
exec awk '
{
if ($1 == "MemFree:") {memfree = int($2/1024); printf
"Memfree: %5d MB\n",memfree}
if ($1 == "Buffers:") {buffers = int($2/1024); printf
"Buffers: %5d MB\n",buffers}
if ($1 == "Cached:") {cached = int($2/1024); printf
"Cached: %5d MB\n",cached}
if ($1 == "c_min") {arcmin = int($3/1024/1024); printf
"arc_min: %5d MB\n",arcmin}
if ($1 == "size") {arcsize = int($3/1024/1024); printf
"arc_size: %5d MB\n",arcsize}
}
END {print "Free = Memfree + Buffers + Cached + arc_size -
arc_min = " memfree + buffers + cached + arcsize - arcmin " MB"}
' /proc/meminfo /proc/spl/kstat/zfs/arcstats
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