[K12OSN] CPU or Memory
"Terrell Prudé, Jr."
microman at cmosnetworks.com
Sun Sep 26 16:05:05 UTC 2004
Liam Marshall wrote:
>I posted earlier about trying to decide whether to upgrade the memory on
>the server, or the cpu
>I had a 3.06 GHz hyperthreading cpu and 2 GB of ram
>when 30 students would all try and load say, OOwriter, cpu use pegged
>and memory usage showed 1.9 out of 2 used. It would be real slow, until
>all where in, then settled down slightly. But web pages and something
>as silly as tux type would bog the whole system down. I know something
>had to be done but could not choose.
>We settled on memory, upgrading to 4 GB. Then I got nervous and ordered
>a dual cpu board and two Xeon 3.06 cpu's as well.
>Then I was frustrated yesterday when the server atx case I planned to
>use had the wrong power supply. the ASUS PC-DL Deluxe motherboard I
>bought needed a SSI type 24 pin connector, mine was 20 pin.
>After some frustrating research I learned what the difference was
>between an SSI 24 pin connector and the power supply I had was, then I
>bit the bullet and went out and paid 185.00 plus tax for the right power
>Then today I was frustrated again. After plugging in the power supply
>and connecting everything, I got nothing but a single loooong beep on
>power up. No video at all. after two hours of frustration, I called a
>friend for a fresh perspective. He brought over another duelly system.
>We tried video card first, known working from his system. Zip. Then we
>tried his memory. Voila! My 4 GB Kingston memory was defective!
>Sh&&%t! All that wasted time.
>Trouble was, my friend only had 2.5 GB of ram for me to try. Everything
>is functioning great though, and I didn't have trouble with the new
>hardware. Nics had to be configured, thats all
>So now, instead of changing two things, cpus and memory, I basically
>have a dual cpu machine, and 2.5 GB. I plan to try out the system under
>load with the students on Monday, seeing as how I have no choice.
>Replacement ram will take at least a week to arrive. By the end of the
>day on Monday I will know whether doubling the cpu's solved the entire
>issue. If it does, I will get my money back for the ram and leave it at
>that. If it helps, but not enough, I will go for the ram to
>If anyone is interested I will post results Monday night.
Yep, I'm interested. As a certain U.S. Senator would say,
You'd have to look at your vmstat as well as top, of course, and check
out your load, but my suspicion is that DRAM will also help you. OO.o
is a bit memory-hungry, and if you're using the default GNOME desktop,
you could be staring 100MB/student DRAM usage in the face. Note that
GNU/Linux will use up all your available DRAM for things like file
caching, so, as Les Mikesell has said before, vmstat is definitely your
friend here (look for a lot of swapping).
As for TuxType, that application will suck up 73Mb/session in a
heartbeat. So, if you're running 100BaseTX on your server, you can
imagine what that'll do. If you're running that application, or
anything else like it (TuxMath, Chromium B.S.U., etc.), better have
Gig-E on the server, and if your hardware supports it, have two Gig-E
NICs and try to gang 'em together.
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