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Mycohl
Joined: 21 Oct 2006
Posts: 8
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 Posted: Sat Mar 21, 2009 19:39 Post subject: nwserver at 99% cpu when detaching from console |
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No matter what I try to detach it, the nwserver process either hangs or goes up to 99% cpu usage. This has not happened to me before, although this is the first time I have tried to set up nwnx on an Ubuntu machine.
Right now, I've got a modified nwnstartup.sh script which I can either include the detach in, or just detach the script itself from the console. I've tried both, and they both seem to leave nwserver at 97-99% cpu.
My previous setup using a named pipe does not seem to work. Redirecting to /dev/null does not seem to work. I am at the limit of my limited shell knowledge at this point, and any help would be greatly appreciated. If you need additonal information, please let me know and I will post it.
Thank you for your time,
Myc |
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Mycohl
Joined: 21 Oct 2006
Posts: 8
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| Posted: Sat Mar 21, 2009 20:05 Post subject: |
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For the record, I would also like to ask what the best way to currently run the thing without having an ssh window open is.
I seem to be stuck with one of two results: either I pipe the input and output and the nwserver goes up to 99%, or I don't, in which case it dies as soon as I detach it or close the ssh connection.
This is really NOT how it was working on Fedora, and I'm wondering if I am doing something wrong? Did something change? |
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Zebranky
Joined: 04 Jun 2006
Posts: 415
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| Posted: Sat Mar 21, 2009 21:22 Post subject: |
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Try screen? That will let you reattach and enter commands if necessary, too.
_________________
Win32 SVN builds: http://www.mercuric.net/nwn/nwnx/
<Fluffy-Kooshy> NWNx plugin is to this as nuclear warheads are to getting rid of fire ants.
<ThriWork> whenever I hear nwn extender, I think what does NWN need a penis extender for? |
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Mycohl
Joined: 21 Oct 2006
Posts: 8
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| Posted: Sat Mar 21, 2009 22:48 Post subject: |
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Thank you. Screen appears to be working fine with nwserver, although unfortunately I can't get start-stop-deamon to work with it. I'll play with it a bit more.
Thanks again for the info. |
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Fireboar
Joined: 17 Feb 2008
Posts: 323
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| Posted: Sun Mar 22, 2009 12:04 Post subject: |
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| Screen is especially powerful when combined with Expect. You can use Expect for starting/stopping the server. |
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metamud
Joined: 30 Sep 2008
Posts: 16
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| Posted: Sun Mar 22, 2009 16:59 Post subject: |
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| Mycohl wrote: | For the record, I would also like to ask what the best way to currently run the thing without having an ssh window open is.
I seem to be stuck with one of two results: either I pipe the input and output and the nwserver goes up to 99%, or I don't, in which case it dies as soon as I detach it or close the ssh connection.
This is really NOT how it was working on Fedora, and I'm wondering if I am doing something wrong? Did something change? |
The 99% CPU is caused by the server continually reading from stdin, which becomes an invalid filedescriptor as soon as you terminate your ssh session. The server select()'s on a number of filedescriptors (among which is stdin), the OS system call select() immediately "falls through" because one of its filedescriptors is invalid. Then nwserver tries to read from stdin, but there is nothing to be done (in fact, it gets E_BADF for even trying to read from an invalid filedescriptor) and the circle is complete as nwserver goes back to select() (only to immediately fall through again etc. etc.).
In short, what you are witnessing is nwserver doing thousands of futile attempts to read from stdin per second.
A shell-based approach
From reading "nwserver -help" I figured that the "-quiet" option will make "nwserver" properly detach std{in,out}:
| Code: | # ./nwserver -help
[..]
-quiet
Run without printing to stdout or reading from stdin, will run in background.
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which makes it "ssh logout"-proof. In my case at least, I have no problems logging off. Heck it's even automated to startup if the power goes off and comes back on.
I have a crontab setup like this:
| Code: | @reboot /usr/sbin/mysqld > ~/install/logs.0/mysqld.txt 2>&1 &
@reboot ~/install/server-loop.sh >/dev/null 2>&1 &
@daily pkill nwserver
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"man crontab" (in lieu of manpages, google works fine) is your friend here.
Then I have a server-loop.sh script:
| Code: | #! /bin/bash
BASE=/home/nwn/install
LOGDIR=${BASE}/logs.0
LOGFILE=${LOGDIR}/server_loop.txt
cd $BASE
while (true)
do
echo "`date`: Rotating logfiles"
savelog -c 3 -n -q $LOGDIR/*.txt
echo "`date`: Starting server"
./nwnstartup.sh -quiet >>$LOGFILE 2>&1
done
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Alert readers will note that as I have redirected stdout and stderr in my crontab, any output from the server-loop.sh script is ditched, when run from cron.
Finally, my version of the ubiquitous nwnstartup.sh script (please substitute your own password):
| Code: | #! /bin/bash
export LD_PRELOAD=./nwnx2.so
./nwserver \
-publicserver 1 \
-servername MetaMud \
-oneparty 0 \
-pvp 1 \
-difficulty 3 \
-elc 1 \
-ilr 0 \
-reloadwhenempty 0 \
-port 5121 \
-maxclients 32 \
-servervault 1 \
-maxlevel 40 \
-gametype 9 \
-autosaveinterval 0 \
-dmpassword SOME_SECRET \
-module "MetaMud" \
"$@"
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This is all on an Ubuntu 8.04.2 "hardy" box (32-bit in case you think it is relevant).
The previously suggested "screen" solution works because it perpetuates the life of std{in,out,err} of nwserver for the duration of the "screen" session. The screen solution also allows you to enter console commands into the server at a later time (e.g., from another ssh session). I don't need to enter console commands, but if you do, my approach may be less feasible for you, as it does not readily offer an alternative way of sending input to nwserver's stdin (which has been closed already).
Hope this helps! |
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