I read an earlier thread on memory consumption (http://tinyurl.com/bly4d),
which may be related to my problem... but because of some differences, I'm
not so sure. Any help would be appreciated!
I have an Apache 2.0.54 server on a Gentoo Linux (2.6.11) box which has 1Gig
RAM and an additional 1Gig swap space. The server handles a lot of people
downloading sermons from our church website (which are no larger than 18Meg
MP3 files), but I can't figure out how to keep the server from running out
of memory.
Here's my Apache2 prefork configuration:
------------------------------------------------------------------------
<IfModule prefork.c>
StartServers 5
MinSpareServers 5
MaxSpareServers 10
MaxClients 20
MaxRequestsPerChild 5000
</IfModule>
And here's what the Apache "/server-status" URL showed earlier today (I had
just restarted the server, but it immediately filled up with download
requests, all from the same guy, apparently using a download accelerator
judging by the duplicate requests):
------------------------------------------------------------------------
Srv PID M CPU Req Request
0-0 15822 W 0.48 0 GET /out/181.mp3 HTTP/1.1
1-0 15823 W 0.00 1742573500 GET /out/388.mp3 HTTP/1.1
2-0 15824 W 0.00 1742573499 GET /out/238.mp3 HTTP/1.1
3-0 15825 W 0.00 1742573499 GET /out/504.mp3 HTTP/1.1
4-0 15826 W 0.00 1742573496 GET /out/388.mp3 HTTP/1.1
5-0 15832 W 0.00 1742572495 GET /out/801.mp3 HTTP/1.1
6-0 15834 W 0.00 1742571493 GET /out/504.mp3 HTTP/1.1
7-0 15835 W 0.00 1742571489 GET /out/504.mp3 HTTP/1.1
8-0 15838 W 0.00 1742570476 GET /out/388.mp3 HTTP/1.1
9-0 15839 W 0.00 1742570484 GET /out/504.mp3 HTTP/1.1
10-0 15840 W 0.60 0 GET /out/238.mp3 HTTP/1.1
11-0 15841 W 0.00 1742570477 GET /out/388.mp3 HTTP/1.1
12-0 15846 W 0.25 0 GET /out/181.mp3 HTTP/1.1
13-0 15847 W 0.00 1742569347 GET /out/181.mp3 HTTP/1.1
14-0 15848 W 0.00 1742568761 GET /out/801.mp3 HTTP/1.1
15-0 15849 W 0.00 1742568761 GET /out/801.mp3 HTTP/1.1
16-0 15852 W 0.19 0 GET /out/181.mp3 HTTP/1.1
17-0 15853 W 0.17 0 GET /out/801.mp3 HTTP/1.1
18-0 15854 W 0.22 0 GET /out/504.mp3 HTTP/1.1
19-0 15855 W 0.28 0 GET /server-status HTTP/1.1
And here's a portion of what "top" showed at the same time:
------------------------------------------------------------------------
top - 18:09:59 up 64 days, 7:08, 3 users, load avg: 21.62, 10.57, 4.70
Tasks: 154 total, 1 running, 143 sleeping, 1 stopped, 9 zombie
Cpu(s): 0.8% us, 2.3% sy, 0.0% ni, 0.0% id, 96.3% wa, 0.3% hi, 0.2% si
Mem: 1034276k total, 1021772k used, 12504k free, 6004k buffers
Swap: 1030316k total, 985832k used, 44484k free, 83812k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
15846 apache 16 0 132m 89m 1968 S 0.3 8.9 0:01.46 apache2
15840 apache 17 0 130m 83m 2008 D 0.0 8.3 0:00.90 apache2
15849 apache 16 0 120m 82m 1968 S 0.3 8.1 0:01.02 apache2
15852 apache 16 0 120m 81m 1968 S 0.3 8.1 0:00.91 apache2
15848 apache 16 0 109m 73m 2008 S 0.3 7.2 0:00.85 apache2
15855 apache 16 0 107m 70m 2076 D 0.3 7.0 0:00.76 apache2
15822 apache 17 0 179m 55m 1968 D 0.3 5.5 0:00.88 apache2
15854 apache 16 0 98024 55m 1968 D 0.0 5.5 0:00.58 apache2
15853 apache 18 0 98.9m 53m 2000 S 0.0 5.3 0:00.51 apache2
15847 apache 17 0 86884 52m 1968 D 0.0 5.2 0:00.42 apache2
15841 apache 17 0 110m 36m 1964 D 0.3 3.6 0:00.64 apache2
15826 apache 17 0 173m 20m 1968 D 0.0 2.0 0:00.57 apache2
15825 apache 16 0 97.7m 19m 1968 D 0.0 1.9 0:00.36 apache2
15834 apache 16 0 117m 14m 1968 D 0.3 1.5 0:00.42 apache2
15839 apache 17 0 115m 12m 1968 D 0.0 1.2 0:00.40 apache2
15838 apache 15 0 182m 12m 1968 D 0.0 1.2 0:00.59 apache2
15823 apache 16 0 180m 11m 1968 D 0.0 1.1 0:00.65 apache2
15824 apache 15 0 103m 9980 1968 D 0.0 1.0 0:00.27 apache2
15832 apache 16 0 116m 9112 1968 D 0.0 0.9 0:00.29 apache2
15835 apache 16 0 162m 8844 1968 D 0.0 0.9 0:00.41 apache2
(everything else listed on "top" below this was less than 0.5 for %MEM)
The memory usage swelled very fast as the download requests came in, and
based on previous experience, the server would have slowed to a crawl and
possible crashed as it tried to save itself if I hadn't run "killall
apache2" at this point.
So it seems like this guy's 19 download requests are enough to pretty much
exhaust my 1 Gig of physical RAM and 1 Gig of swap space. That just doesn't
seem right. EVEN IF something weird was happening where every Apache child
loaded an entire MP3 file into RAM before serving it, that still only
accounts for 20 servers * 18Meg files = 360Meg RAM - a lot, but nowhere near
2 Gig. Yet these 20 processes have consumed almost 2 Gig.
What am I doing wrong that so few download requests can bring the server to
its knees? How can I fix this configuration?
Thanks to anyone who can help!
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