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Memory usage grows to 90% when connected to internet
http://forums.linhes.org/viewtopic.php?f=5&t=9820		 Page 1 of 1
Author:  myth19kirt [ Thu Apr 27, 2006 2:59 pm ]
Post subject:  Memory usage grows to 90% when connected to internet
Originally I had 512MB ram and a 40GB HD. After installing Myth I went to the system info page and saw that my system was using 237MB with everything loaded. When I recorded things, Commerial Flagged or Transcoded files I would see my memory use grow slightly, but I always had plenty. (40-60% available) :D

I wanted to have my Mythbox also run VMWare occasionally. I bought a bigger drive and another 512MB. Without installing anything but Myth 5B7 I saw that my system info at bootup was 237MB like always. Without any scheduled recordings, nothing but a fresh install; I would see my memory grow until only 10% was available. :o If I did a fresh install and not have it plugged into the WWW this number remained low. (ALLOW to external addresses not set)

My questions are:
Has anyone else noticed this?
Which passwords should I change to avoid someone high-jacking my box for their use? :evil:
Can I disable the NOBODY or guest account?
There are many accounts in knoppix, which ones are absolutely needed?
Is there any other security concerns?
Can WWW see all of my Windows PC's shares through the mythbox?
Author:  ryanpatterson [ Thu Apr 27, 2006 6:48 pm ]
Post subject: 
That type of memory ussage is normal with linux. There is nobody hacking your computer.

Linux uses most avaiable free memory as a disk cache. When a program wants more memory linux just decreases the size of the disk cache to free up memory. You could have 16GB of ram and linux will adventually "use" 95% of it just keeping unused files in memory incase they need to be accessed. If your memory really fills up then your swap partition would be seeing some searous use.
Author:  myth19kirt [ Thu Apr 27, 2006 9:55 pm ]
Post subject:  That type of memory ussage is normal with linux.
Thank you for stating that. Some one told me something simular at work. :oops:

I was looking at TOP and using keys < > to sort by memory; I could not see where it all went. VLC, frontend, XFree86, mysql and backend only used 22% about 220MB with a number of less than 1% processes. At startup 240MB in use. As the seconds go by with no activity scheduled I was not expecting to see my available memory go down to less than 5%.
Quote:
You could have 16GB of ram and linux will adventually "use" 95% of it just keeping unused files in memory incase they need to be accessed.

I guess I need to read a book on linux. I was chasing that demon for no reason. :twisted:

Would it be possible to install other apps on my mythbox such as VMWare, or some other memory Intense application? (Backend PVR500 without frontend running)

Thanks again
Author:  Xsecrets [ Thu Apr 27, 2006 11:23 pm ]
Post subject: 
adding more apps shouldn't be too much of a problem mythtv itself is not too much of a memory hog. What you have to watch out for on linux as far as memory goes is the swap. If you have much swap used at all then you are running out of memory, but the standard state of a linux box is to have all physical memory used, but almost no swap.
Author:  myth19kirt [ Fri Apr 28, 2006 10:39 pm ]
Post subject:  Memory use
Thanks for the clarification. I'll keep an eye out for it. So far I only seen swap used once. I started many commflags and transcodes at once.
Quote:
If you have much swap used at all then you are running out of memory, but the standard state of a linux box is to have all physical memory used, but almost no swap.
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