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! --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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