On Thu, Apr 20, 2006 at 07:56:27AM -0400, Vaishnavi R wrote:
I have installed Hobbit on Red Hat ES Linux. Everything works fine but I feel the memory usage by Hobbit is high.
My Hobbit version is 4.1.2p1
I am not very good on Linux and am not sure how to find out which process is consuming so much memory. [snip] Following is a snapshot of how memory was used
The data you provide is simply not enough to say what is using your memory.
A look at your data shows a couple of things:
Swap is just not used - it stays constant at 160 KB. So there's really no memory pressure at all.
The "used" column in the "-/+ buffers/cache" is what you should be looking at. Linux will use lots of memory for various types of disk caches, but these can be freed instantaneously if some application needs memory. So when evaluating your memory usage, you shouldn't really count the buffer/cache memory as "used". Memory usage grows from ~296 MB upon startup to ~300 MB after starting Hobbit - it seems quite reasonable for Hobbit to use 4 MB of memory just to run. Half an hour later, it's grown an extra MB, which is also normal as more data is being recorded by Hobbit. After that it should be stable, unless you add more tests or hosts, of course. 6 hours later you're up to 350 MB used - whether that is used by Hobbit or something else I cannot tell.
What you *really* should do is to see how much memory the different processes are using. E.g.
$ ps vax --sort -rss
will show a list of all processes currently running, sorted by memory usage. That should give you a much better clue at what is using memory on your system. I am fairly confident that you'll see Hobbit is not using a lot of memory. If I run this on my main production system (which is also running 4.1.2p1, incidentally), I get this:
$ ps v --sort -rss -u hobbit PID TTY STAT TIME MAJFL TRS DRS RSS %MEM COMMAND 745 ? S 1780:29 1 162 27077 25600 2.4 hobbitd --pidfile 1241 ? S 918:42 1 154 11789 10008 0.9 hobbitd_alert --c 1242 ? S 2638:33 7 167 6696 2984 0.2 hobbitd_rrd --rrdd 27775 ? S 153:39 1 146 4341 2704 0.2 hobbitd_client 27774 ? S 63:42 0 99 2844 1832 0.1 hobbitd_channel -- 6171 ? S 338:33 1 167 5624 1736 0.1 hobbitd_rrd --rrdd 6582 ? S 0:00 0 669 2002 1344 0.1 sh -c vmstat 300 2 1234 ? S 3099:30 1 99 2332 1264 0.1 hobbitd_channel -- 1233 ? S 629:37 1 99 2332 1200 0.1 hobbitd_channel -- 1232 ? S 12:41 1 99 2332 1184 0.1 hobbitd_channel -- 6170 ? S 153:12 0 99 2332 1144 0.1 hobbitd_channel -- 1243 ? S 21:55 0 108 2515 1136 0.1 hobbitd_history 6584 ? S 0:00 0 79 1824 760 0.0 vmstat 300 2 743 ? Ss 1:06 0 101 1802 696 0.0 hobbitlaunch --con
This system has 1 GB of memory, and handles over 2000 monitored hosts. It's been running since March 12. And Hobbit uses 52 MB of memory (sum of the RSS column, where numbers are in KB).
Regards, Henrik