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тАО12-27-2000 05:26 PM
тАО12-27-2000 05:26 PM
Has anyone seen a Load Avg of 99-112 on a 6 way k580?
Just curious....
Rhonda
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тАО12-27-2000 06:01 PM
тАО12-27-2000 06:01 PM
Re: Has anyone seen a Load Avg of 99-112 on a 6 way k580?
But change the type of processes to badly written client/server polling where each process polls a client several times a second. In this scenario, the overall CPU load is low (from a user perspective) but system overhead will be very high (context switching, LAN overhead), especially when 500 copies of the program are run at the same time. LAN traffic will be very high, system overhead will approach 90% and the runqueue (load factor) might rise to 100 or even 200.
Yet the system seems to respond well. In this (not so) artificial case, the processes are stacked in the runqueue and run as fast as the dispatcher can get them started. But they have almost nothing to do (just a couple of LAN packets) so they complete the poll very quickly, sleep for a short time and back they come.
While the programs are collectively I/O and system overhead intensive, they allow interactive processes to still respond quickly and the system will seem reasonably responsive.
But the easy answer is that your load factor is unusually high and you should probably track down the culprit(s). It could be caused by a series of multi-threaded processes that are having problems.
Generally, I see the biggest CPU hogs as processes that perform massive LAN and CPU tasks at the same time, or processes that drain the filesystem bandwidth. The easiest way to crush a system is to start about 50 copies of:
du -s / > /dev/null
or
find / > /dev/null
Put these processes on a system with 6 processors and everyone will start complaining. That's why I never allow find / on any of my systems (a very common how-to example in beginner Unix classes).
Bill Hassell, sysadmin
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тАО12-27-2000 08:00 PM
тАО12-27-2000 08:00 PM
Re: Has anyone seen a Load Avg of 99-112 on a 6 way k580?
Yes I have seen that . User had written a Perl script that was spawning child processes .
System was horribly slow and we had tough time killing the process as it was spawning faster than we could kill.
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тАО12-28-2000 05:47 AM
тАО12-28-2000 05:47 AM
Re: Has anyone seen a Load Avg of 99-112 on a 6 way k580?
154.6 Load was my record on a 6way K580,
The machine stayed up and I was able to bring it under control without a panic.
600 + runnning need to be investigated - start with the sofware guys they are usually to blame.
"I just thought" is the normal excuse.
;^)
Paula
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тАО12-28-2000 11:23 AM
тАО12-28-2000 11:23 AM
Re: Has anyone seen a Load Avg of 99-112 on a 6 way k580?
With gpm I could notice that I had 400-500 died processes every at every refresh. It wasn't to much I could do. I wish I was a performance guru at that time and do some magic ...
Ovidiu
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тАО01-02-2001 08:12 AM
тАО01-02-2001 08:12 AM
Re: Has anyone seen a Load Avg of 99-112 on a 6 way k580?
I was just wondering if the old k580 240Mhz CPU's could handle the load until we migrated to new platforms.
Rhonda
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тАО01-02-2001 08:15 AM
тАО01-02-2001 08:15 AM
Re: Has anyone seen a Load Avg of 99-112 on a 6 way k580?
Rhonda
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тАО01-04-2001 11:00 AM
тАО01-04-2001 11:00 AM
Re: Has anyone seen a Load Avg of 99-112 on a 6 way k580?
-dlt-
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тАО01-04-2001 12:19 PM
тАО01-04-2001 12:19 PM
Re: Has anyone seen a Load Avg of 99-112 on a 6 way k580?
Controlling your load can be done in many ways and depends upon your connectivity and of course what your company is doing.
1. X25 connections can be controlled by reducing the number of connections allowed in the file /etc/x25/x25configxxx
2. If in a sales environment insist that the admin is reduced or done at quiet times so that the server can concentrate on selling.
3. Many users like multiple sessions running - stop or reduce them.
4. Defrag the database - check the forums on how to do this.
5. Stop all non-essential background processes.
6. Stop large reports / searches.
HTH
Paula