If I add up my memory usage in each VE, it adds up to a lot less than what is (apparently) actually being consumed.
This is causing me grief on a production server, in that I'm running out of RAM, and going into swap, which is really hurting my web server - it slows to a crawl, then processes back up, and memory usage really spirals up.
Evidence:
# for v in ` cd /proc/bc ; echo * `; do echo $v; vzctl exec $v free -m; done
---- VE: 100
total used free shared buffers cached
Mem: 256 9 246 0 0 0
-/+ buffers/cache: 9 246
Swap: 0 0 0
---- VE: 101
total used free shared buffers cached
Mem: 921 493 427 0 0 0
-/+ buffers/cache: 493 427
Swap: 0 0 0
---- VE: 102
total used free shared buffers cached
Mem: 460 58 402 0 0 0
-/+ buffers/cache: 58 402
Swap: 0 0 0
---- VE: 106
total used free shared buffers cached
Mem: 345 20 324 0 0 0
-/+ buffers/cache: 20 324
Swap: 0 0 0
---- VE: 107
total used free shared buffers cached
Mem: 115 37 77 0 0 0
-/+ buffers/cache: 37 77
Swap: 0 0 0
Add up the "used" columns, and I get around 617MB
On the HN:
# free -m
total used free shared buffers cached
Mem: 1945 1901 43 0 40 100
-/+ buffers/cache: 1761 184
Swap: 6143 281 5862
It is showing 1761MB in use.
If I do some maths on the output of /proc/bc/*, I get similar results:
# ~/beano < /proc/user_beancounters
VE 107: priv = 36MB, kmem = 0MB
VE 106: priv = 20MB, kmem = 1MB
VE 102: priv = 58MB, kmem = 1MB
VE 101: priv = 497MB, kmem = 11MB
VE 100: priv = 9MB, kmem = 0MB
VE 0: priv = 39MB, kmem = 7MB
This totals 679MB (note, this was run a few minutes after the above maths, so numbers differ slightly).
So, why the large discrepancy? Where's my missing 1GB of memory gone?
Caveats: I know I'm probably not doing the maths 100% accurately, but it's near enough to know that something isn't right.
Detail:
Here's /proc/user_beancount:
# cat /proc/user_beancounters
Version: 2.5
uid resource held maxheld barrier limit failcnt
107: kmemsize 903172 2714806 14372700 14790164 0
lockedpages 0 0 256 256 0
privvmpages 9457 20561 29491 32768 0
shmpages 0 1296 21504 21504 0
dummy 0 0 0 0 0
numproc 9 22 240 240 0
physpages 493 8769 0 9223372036854775807 0
vmguarpages 0 0 33792 9223372036854775807 0
oomguarpages 1165 8957 26112 9223372036854775807 0
numtcpsock 6 12 360 360 0
numflock 1 6 188 206 0
numpty 0 3 16 16 0
numsiginfo 0 2 256 256 0
tcpsndbuf 104640 165944 1720320 2703360 0
tcprcvbuf 98304 401464 1720320 2703360 0
othersockbuf 11560 22328 1126080 2097152 0
dgramrcvbuf 0 34880 262144 262144 0
numothersock 7 16 360 360 0
dcachesize 98595 193317 3409920 3624960 0
numfile 221 471 9312 9312 0
dummy 0 0 0 0 0
dummy 0 0 0 0 0
dummy 0 0 0 0 0
numiptent 14 14 128 128 0
106: kmemsize 1798197 3523117 14372700 14790164 0
lockedpages 0 0 256 256 0
privvmpages 5189 19476 88473 98304 0
shmpages 18 674 21504 21504 0
dummy 0 0 0 0 0
numproc 8 22 240 240 0
physpages 116 5050 0 9223372036854775807 0
vmguarpages 0 0 29491 32768 0
oomguarpages 1588 6541 26112 9223372036854775807 0
numtcpsock 3 11 360 360 0
numflock 1 2 188 206 0
numpty 0 1 16 16 0
numsiginfo 0 2 256 256 0
tcpsndbuf 52320 338296 1720320 2703360 0
tcprcvbuf 49152 0 1720320 2703360 0
othersockbuf 2312 9808 1126080 2097152 0
dgramrcvbuf 0 8456 262144 262144 0
numothersock 1 9 360 360 0
dcachesize 131460 201016 3409920 3624960 0
numfile 202 430 9312 9312 0
dummy 0 0 0 0 0
dummy 0 0 0 0 0
dummy 0 0 0 0 0
numiptent 14 14 128 128 0
102: kmemsize 1725889 4340821 14372700 14790164 0
lockedpages 0 0 256 256 0
privvmpages 14717 39041 117964 131072 0
shmpages 0 3216 21504 21504 0
dummy 0 0 0 0 0
numproc 9 26 240 240 0
physpages 9404 25165 0 9223372036854775807 0
vmguarpages 0 0 29491 32768 0
oomguarpages 20698 28347 26112 9223372036854775807 0
numtcpsock 25 360 360 360 2775
numflock 1 3 188 206 0
numpty 3 5 16 16 0
numsiginfo 0 2 256 256 0
tcpsndbuf 213768 2029080 1720320 2703360 14887573
tcprcvbuf 202448 2002936 1720320 2703360 2513133
othersockbuf 2312 322376 1126080 2097152 0
dgramrcvbuf 0 8456 262144 262144 0
numothersock 1 35 360 360 0
dcachesize 181125 444357 3409920 3624960 0
numfile 771 1103 9312 9312 0
dummy 0 0 0 0 0
dummy 0 0 0 0 0
dummy 0 0 0 0 0
numiptent 14 14 128 128 0
101: kmemsize 11635745 46486929 134217728 147639500 0
lockedpages 0 0 256 256 0
privvmpages 128074 263359 235929 262144 165044
shmpages 8512 15568 21504 21504 0
dummy 0 0 0 0 0
numproc 65 159 400 400 0
physpages 36906 85441 0 9223372036854775807 0
vmguarpages 0 0 58982 65536 0
oomguarpages 89615 141348 58982 65536 0
numtcpsock 32 173 360 360 0
numflock 9 21 188 206 0
numpty 1 2 16 16 0
numsiginfo 0 78 256 256 0
tcpsndbuf 215952 1724304 1720320 2703360 113
tcprcvbuf 210216 710136 1720320 2703360 0
othersockbuf 18496 179904 1126080 2097152 0
dgramrcvbuf 0 23648 262144 262144 0
numothersock 20 93 360 360 0
dcachesize 452598 620679 3409920 3624960 0
numfile 1569 2534 9312 9312 0
dummy 0 0 0 0 0
dummy 0 0 0 0 0
dummy 0 0 0 0 0
numiptent 14 14 128 128 0
100: kmemsize 788463 2142311 14372700 14790164 0
lockedpages 0 0 256 256 0
privvmpages 2372 16843 58982 65536 0
shmpages 0 656 21504 21504 0
dummy 0 0 0 0 0
numproc 6 19 240 240 0
physpages 133 7774 0 9223372036854775807 0
vmguarpages 0 0 14745 16384 0
oomguarpages 1915 8764 26112 9223372036854775807 0
numtcpsock 4 10 360 360 0
numflock 1 5 188 206 0
numpty 0 1 16 16 0
numsiginfo 0 3 256 256 0
tcpsndbuf 69760 353160 1720320 2703360 0
tcprcvbuf 65536 484104 1720320 2703360 0
othersockbuf 11560 34840 1126080 2097152 0
dgramrcvbuf 0 25168 262144 262144 0
numothersock 6 14 360 360 0
dcachesize 17841 59157 3409920 3624960 0
numfile 153 388 9312 9312 0
dummy 0 0 0 0 0
dummy 0 0 0 0 0
dummy 0 0 0 0 0
numiptent 10 10 128 128 0
0: kmemsize 8083585 9508188 9223372036854775807 9223372036854775807 0
lockedpages 0 5209 9223372036854775807 9223372036854775807 0
privvmpages 10142 20783 9223372036854775807 9223372036854775807 0
shmpages 1927 2599 9223372036854775807 9223372036854775807 0
dummy 0 0 9223372036854775807 9223372036854775807 0
numproc 78 88 9223372036854775807 9223372036854775807 0
physpages 1885 15036 9223372036854775807 9223372036854775807 0
vmguarpages 0 0 9223372036854775807 9223372036854775807 0
oomguarpages 6012 25423 9223372036854775807 9223372036854775807 0
numtcpsock 8 33 9223372036854775807 9223372036854775807 0
numflock 2 8 9223372036854775807 9223372036854775807 0
numpty 3 4 9223372036854775807 9223372036854775807 0
numsiginfo 1 5 9223372036854775807 9223372036854775807 0
tcpsndbuf 160128 177568 9223372036854775807 9223372036854775807 0
tcprcvbuf 131072 330576 9223372036854775807 9223372036854775807 0
othersockbuf 32368 116888 9223372036854775807 9223372036854775807 0
dgramrcvbuf 0 65688 9223372036854775807 9223372036854775807 0
numothersock 43 56 9223372036854775807 9223372036854775807 0
dcachesize 1936469 2800110 9223372036854775807 9223372036854775807 0
numfile 1766 2793 9223372036854775807 9223372036854775807 0
dummy 0 0 9223372036854775807 9223372036854775807 0
dummy 0 0 9223372036854775807 9223372036854775807 0
dummy 0 0 9223372036854775807 9223372036854775807 0
numiptent 306 321 9223372036854775807 9223372036854775807 0
Here's my beano script:
#!/usr/bin/awk -f
$1 ~ /[1-9][0-9]*:/ { veid = substr($1, 0, length($1)) }
$1 ~ /0:/ { veid = substr($1, 0, length($1)) }
$2 ~ /kmemsize/ { kmem = int($3 / 1024 / 1024) ; kmem_mh = int($3 / 1024 / 1024) }
$1 ~ /privvmpages/ { priv = int($2 / 256) ; priv_mh = int($2 / 256) }
$1 ~ /numiptent/ { printf ("VE %s: priv = %dMB, kmem = %dMB\n", veid, priv, kmem) }
Operating system is Debian etch. Kernel is:
# uname -a
Linux alpha 2.6.18-12-fza-amd64 #1 SMP Sun May 18 09:57:08 UTC 2008 x86_64 GNU/Linux
Packages:
# dpkg -l \*vz\*
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name Version Description
+++-=================================-=================================-==================================================================================
un ovzkernel <none> (no description available)
ii vzctl 3.0.22-1dso1 OpenVZ - server virtualization solution - control tools
un vzctl-ostemplate <none> (no description available)
ii vzctl-ostmpl-debian 4.0-20071003 OpenVZ - OS Template - Debian 4.0
un vzctl-template-debian <none> (no description available)
ii vzdump 1.0-2 OpenVZ backup scripts
ii vzprocps 2.0.11-1dso2 OpenVZ - server virtualization solution - procps utilities
ii vzquota 3.0.11-1dso1 OpenVZ - server virtualization solution - quota tools
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