Linuxers July 2002

linuxers@mm.ilug-bom.org.in

100 participants
233 discussions

Limiting processor usage
by Sameer D. Sahasrabuddhe 17 Jul '02

17 Jul '02

Hi, I need a way to set a hard limit on processor usage on the server. A user had spawned three processes, one on each processor (the fourth one got fried a long time ago), which kept them 90% busy. The result was that the server became to slow to even reply to ping packets, not to mention loss of DNS service. The command "ulimit" has an option "-t" that can set a limit on processor usage in seconds ... what does that mean? I want to say something like "only x% on only y processors" if possible. Is there a way to do that? Will simply limiting processor usage help solve the problem we faced? Sameer. -- MTech Student, Reconfigurable Computing Lab, KReSIT, IIT-Bombay. ---------------------------------------------------------------------- ####[ Linux One Stanza Tip (LOST) ]########################### Sub : Lesser known commands (toe) LOST #212 To know what all terms are supported by the kernel use: $toe | less This info may be needed when telnetting to another host with a different OS which does not recognise linux as TERM type. ####<bish(a)nde.vsnl.net.in>####################################

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RE: [ILUG-BOM] Linux partitions
by dodobh＠nettaxi.com 17 Jul '02

17 Jul '02

Sameer Shinde spewed into the ether: <snip> > Don't ask me to read how-tos. I want to discusses this >point with you as I found variation in the suggestion in >various ppls. No HOWTOs. http://www.pathname.com/fhs/ Lots of reasoning there (and its a standard too). <snip> > During the installation, once linux dispelled a message >that, your /(root) partition should not be less than 250MB. I have / with 100 MB and I can still install deadrat on that. Its a matter of what you install and stuff. I personally use /,/boot,/usr,/var,/usr/local,/home,/tmp, swap (and maybe /opt). Mount /usr, / and /boot as readonly, maybe /usr/local too (unless you keep installing software like I do. >But then what about other partitions, like /home, /var, /dev >/tmp & other. What they are used for? See that URL I mentioned. >One more....... >& in which order they should be mounted? >which is the 1st & which one is last? / first, then the others, in any order you wish. /bin/mount *MUST* be present in /, /usr need not be mounted for lots of reasons. Devdas Bhagat ------------------------------------------------------------ NEW - FREE Nettaxi 56kbs Dial-up INTERNET ACCESS with NO ADS or Ad Bars! http://www.nettaxi.com/isp/

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Re: RAM v/s Swap Size (was Error while transfering install image on HDD- Out of disk space)
by Vinay Pai 17 Jul '02

17 Jul '02

> Your swap should ideally be twice your RAM. Could someone explain this to me... (please no lengthy explantation of what swap space means, please... I'm a computer science graduate :) ) I've never quite figured out why. After all, your system uses a certain amount of virtual memory that depends on the apps you use. physical ram + swap space used = virtual memory used Thus shouldn't you need *less* swap space if you have more RAM? I have 384MB of RAM and my swap space usage remains stubbornly stuck at 0. Wouldn've been an awful waste of 768 MB or hard disk space if I'd followed that rule-of-the-thumb!! (Instead what I've done is to remove the swap partition and allocate swap files if I ever do anything memory-intensive enough to require more space... and that has never happened)

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Re: Limiting processor usage
by Amish Mehta 17 Jul '02

17 Jul '02

Sameer D. Sahasrabuddhe wrote: >The command "ulimit" has an option "-t" that can set a limit on >processor usage in seconds ... what does that mean? if u say ulimit of 1 sec, process will be KILLed if it uses more than 1sec of CPU time. (ps reports TIME field) > >I want to say something like "only x% on only y processors" if possible. >Is there a way to do that? 'nice' might be of help. But percentagewise CPU usage, I think can not be done, but not sure. > >Will simply limiting processor usage help solve the problem we faced? If you use ulimit than your problem might get solved but genuine users might get into problem. Amish.

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Linux partitions
by Sameer Shinde 17 Jul '02

17 Jul '02

Hi All, How many partitions should we have to install Linux on any system? & what should be their size if we have 4GB of disk space & installation packages take around 2.5GB to install. Swap, I know, double the ram.(127MB in most cases) On the RHL 7.1 CD , in the installation strategies how-to, I read that we can install linux with min. 3 partitions. They are, /boot, /swap & /(root). But this way I found the system is slow Don't ask me to read how-tos. I want to discusses this point with you as I found variation in the suggestion in various ppls. Some says your / partition should be the largest on the other hand some says /usr partition should be large, as the installed S/W get installed on this partition One of my friend told me that your /boot partition should be the largest partition. I know he is wrong, as some of our friends told me that around 10 to 20 MB are enough for /boot. During the installation, once linux dispelled a message that, your /(root) partition should not be less than 250MB. But then what about other partitions, like /home, /var, /dev /tmp & other. What they are used for? One more....... & in which order they should be mounted? which is the 1st & which one is last? Thanks & Regards, SAMEER :) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ My Messenger IDs : MSN : s2sameer Yahoo! : s9sameer RediffBol : s2sameer Indiatimes : s2sameer ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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RPM Problem
by Sachin 17 Jul '02

17 Jul '02

hi there while i was upgrading rpm pakage from rpm-4.0.2x i removed rpm of previos version now i can install newer version please tell me how to isntall rpm package do i have to install it from a tarball thanx for u r suggestion in advance sachin -- ~=~=~=~=~=~=~=~=~=~=~=~=~=~= sachin(a)mediaibc.com MediaIBC ~=~=~=~=~=~=~=~=~=~=~=~=~=~= Kissing a smoker is like licking an ashtray. ~=~=~=~=~=~=~=~=~=~=~=~=~=~=

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Re: Re: [ILUG-BOM] Userfriendly
by Amol Hatwar 16 Jul '02

16 Jul '02

On Sun, 14 Jul 2002 Shishir wrote : >I agree with Amit. *choke ... chuckle* Amit who? I am amol. :) with warm wishes, -ah _________________________________________________________ There is always a better job for you at Monsterindia.com. Go now http://monsterindia.rediff.com/jobs

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Help in Ximian Desktop downloaded from ilub bom site
by Sachin 16 Jul '02

16 Jul '02

hi there i tried to install ximian red carpet on the on box downloaded from from db.ilug-bom.org.in no i could inot install the Ximian Desktop as it gives error as on 3 step after i select the local dir to install ------------------------- ERROR: Unable to resolve the server. Please ensure that your network connection is working properly. ------------------------- i have dir struct as follows /downloads | +--redcarpet [DIR] +distro.xml install.xml +installer-rpm-glibc2.2-i386 snarf.i386 which-distro.i386 +-----ximian-gnome[DIR] +---redhat-62-i386[DIR] + [All rpms] thanx for u r suggestions -- ~=~=~=~=~=~=~=~=~=~=~=~=~=~= sachin(a)mediaibc.com MediaIBC ~=~=~=~=~=~=~=~=~=~=~=~=~=~= Lay off the muses, it's a very tough dollar. -- S.J. Perelman ~=~=~=~=~=~=~=~=~=~=~=~=~=~=

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HDD in LBA? CHS? Huh?
by Satya 16 Jul '02

16 Jul '02

So I went and got a new 40GB hard drive and plugged it in as /dev/hdc. This box only had /dev/hda until now. So what does Linux fdisk (and cfdisk) do? They both think it's a 6GB drive. Fiddling with all settings in CMOS doesn't help. besides, the *kernel* knows it's 40 gigs. Enter DOS fdisk. Which happily recognizes the drive, creates a token 100MB partition (I don't trust LILO, I use loadlin. I should put lilo next.) and happily formats it. (Okay, that was DOS format. Whatever.) Now Linux fdisk sees all the cylinders/sectors/foo. So now I'm embarassed: Why did Linux fdisk not recognize it for what it was, the first time? For that matter, which is better in CMOS: Auto (duh) LBA Large (whatever *that* means) CHS (and lie about the geometry) ? -- Satya. <URL:http://satya.virtualave.net/> I didn't know it was impossible when I did it.

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new user, internet connectivity problem
by Abhijit Bhabhe 16 Jul '02

16 Jul '02

hi, have just joined this list. we are currently in the process of setting up a linux server...having problems with squid, unable to connect to the internet...it says cant down-load the page, sent and received bytes are also very low. what could be the problem. do get back if any of you have ideas.. thnx, abhijit

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Linuxers July 2002