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/ 2 Years ago, wed, february 2, 2022, 2:42:43
Running Ubuntu Server 12.04, meminfo shows pretty much all memory utilized:
$ cat /proc/meminfo
MemTotal: 8173180 kB
MemFree: 139556 kB
Buffers: 1146204 kB
Cached: 3062088 kB
SwapCached: 28 kB
Active: 4181280 kB
Inactive: 2175224 kB
Active(anon): 1824800 kB
Inactive(anon): 329536 kB
Active(file): 2356480 kB
Inactive(file): 1845688 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 11719380 kB
SwapFree: 11719068 kB
Dirty: 160 kB
Writeback: 0 kB
AnonPages: 2148472 kB
Mapped: 98200 kB
Shmem: 6128 kB
Slab: 1509448 kB
SReclaimable: 1463828 kB
SUnreclaim: 45620 kB
KernelStack: 4504 kB
PageTables: 37756 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 15805968 kB
Committed_AS: 2828504 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 295632 kB
VmallocChunk: 34359432032 kB
HardwareCorrupted: 0 kB
AnonHugePages: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 195904 kB
DirectMap2M: 8187904 kB
This was just after a few hours after reboot. The memory was rapidly consumed. When I run top, the first 5 entries look like this:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
20011 myuser 20 0 654m 406m 3584 S 2 5.1 3:38.71 ruby
1311 root 20 0 0 0 0 S 0 0.0 3:50.95 jbd2/sda3-8
20633 root 20 0 0 0 0 S 0 0.0 0:02.82 kworker/7:3
27547 myuser 20 0 17468 1492 1044 R 0 0.0 0:00.07 top
1 root 20 0 24728 2672 1380 S 0 0.0 0:01.28 init
2 root 20 0 0 0 0 S 0 0.0 0:00.00 kthreadd
So only ruby is currently utilizing memory.
I can break that down further between phusion passenger (a module for apache) and apache:
------ Passenger processes ------
PID VMSize Private Name
---------------------------------
4088 218.3 MB 0.3 MB PassengerWatchdog
4092 1271.8 MB 2.9 MB PassengerHelperAgent
4099 230.6 MB 1.0 MB PassengerLoggingAgent
7143 317.8 MB 90.3 MB Passenger RackApp: /home/mysite/public_html/store.mysite.com/current
14841 654.3 MB 414.2 MB Passenger RackApp: /home/mysite/public_html/staging.mysite.com/current
17393 718.3 MB 444.1 MB Passenger RackApp: /home/mysite/public_html/staging.mysite.com/current
20004 526.2 MB 231.3 MB Passenger RackApp: /home/mysite/public_html/staging.mysite.com/current
20011 654.1 MB 340.6 MB Passenger RackApp: /home/mysite/public_html/staging.mysite.com/current
20018 462.2 MB 150.9 MB Passenger RackApp: /home/mysite/public_html/staging.mysite.com/current
### Processes: 9
### Total private dirty RSS: 1675.62 MB
Apache workers:
lynx http://localhost/server-status
Total accesses: 4452 - Total Traffic: 19.3 MB
CPU Usage: u.31 s.21 cu0 cs0 - .000612% CPU load
.0524 requests/sec - 238 B/second - 4556 B/request
10 requests currently being processed, 5 idle workers
_WW_W__WWWW..W.W..._W...........................................
................................................................
................................................................
................................................................
$ ps aux | grep apache2 | grep -v pts | awk '{ tot += $6; procs += 1; print $2,$6,$11 } END { print "TOTAL: ",tot,"/",procs,"=",tot/procs }'
4084 23068 /usr/sbin/apache2
7089 13496 /usr/sbin/apache2
11074 13668 /usr/sbin/apache2
14848 13288 /usr/sbin/apache2
16562 13508 /usr/sbin/apache2
16565 13248 /usr/sbin/apache2
17527 13832 /usr/sbin/apache2
21656 13516 /usr/sbin/apache2
23567 13508 /usr/sbin/apache2
24407 13508 /usr/sbin/apache2
25506 13256 /usr/sbin/apache2
26736 13540 /usr/sbin/apache2
26742 13288 /usr/sbin/apache2
27526 13512 /usr/sbin/apache2
27729 13036 /usr/sbin/apache2
28198 13032 /usr/sbin/apache2
TOTAL: 224304 / 16 = 14019
As you can see, no way apache/phusion passenger are utilizing almost 8 gb of RAM. What could be going on here?
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