08-11-2008
What would cause high kernel/system utilisation
We have a VM running RedHat that seems to have very high system (kernel) utilisation compared to our physical servers running the same OS and workload that show normal system time utilisation.
Any ideas?
Thanks in advance.
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
Hi
I have a lot of scripts running on a Sun Solaris server, which are constantly running in a loop looking for work to do. When they have no work they sleep for a certain amount of time (60secs normally). I have 13 of these scripts running the number of sleep command issued can be in the order... (4 Replies)
Discussion started by: handak9
4 Replies
2. UNIX for Advanced & Expert Users
Hi,
I am seeing very high kernel usage and very high load averages on my system (Although we are not loading much data to our database). Here is the output of top...does anyone know what i should be looking at?
Thanks,
Lorraine
last pid: 13144; load averages: 22.32, 19.81, 16.78 ... (4 Replies)
Discussion started by: lorrainenineill
4 Replies
3. Linux
Hi All,
Kindly help me in optimizing the server as it displays a great amount of CPU & MEM being utilised when the mysql process executes.
Below are the stats ---
--------------------------------------------------------------------------
# top
15:51:57 up 23:22, 5 users, load average:... (1 Reply)
Discussion started by: gautamatul82
1 Replies
4. IP Networking
hi,
we have one unix server which sends multicast packets in the network, recently we have implemented firewall in between unix server and clients.After implementing firewall we found our lease line utilisation has been increased dramatically.
Is this because of firewall or else...please... (2 Replies)
Discussion started by: ajaysahoo
2 Replies
5. UNIX for Advanced & Expert Users
I've got a domain running on a few boards of a 25k. I'm seeing very high kernel cpu usage in top and cant' quite explain it. System runs a large number of smallish Oracle 10g2 databases (30), used mainly for development.
load average: 36.63, 36.68, 37.42
2489 processes: 2452 sleeping, 21... (0 Replies)
Discussion started by: utopiajoe
0 Replies
6. Solaris
Hi gurus
Could anybody tell me which file is read by kernel to set its default system kernal parameters values in solaris. Here I am not taking about /etc/system file which is used to load kernal modules or to change any default system kernal parameter value
Is it /dev/kmem file or something... (1 Reply)
Discussion started by: girish.batra
1 Replies
7. UNIX for Dummies Questions & Answers
Need some clarification on this....
1. how are kernel/ user spaces and high/low memory related?
2. What do they all mean when i have the kernel command line as:
"console=ttyS0,115200 root=/dev/sda2 rw mem=exactmap memmap=1M@0 memmap=96M@1M irqpoll"
or
2. what do mem and memmap mean in... (3 Replies)
Discussion started by: dragonpoint
3 Replies
8. UNIX for Advanced & Expert Users
Hi all,
I have a solaris box, and I would like to know if anyone has commands to check kernel usage's.
Scenario:
solaris box is having cpu 100 % issue. .
I have used sar -u 10 5 it shows 35 % kernel usage.
If you can guide with some docs that would be good..
waiting for... (1 Reply)
Discussion started by: SunSolars_admin
1 Replies
9. Shell Programming and Scripting
Hi ,
I am trying to :wall: my head while scripting ..I am really new to this stuff , never did it before :( .
how to find cpu's system high time and user time high in a script??
thanks , help would be appreciated !
:) (9 Replies)
Discussion started by: sushwey
9 Replies
10. Linux
Hi friends,
Problem: High memory utilisation of one linux server, due to which a database crashed on the server.
My question to all: How does glance calculate that memory utilisation on the linux server is 98%.
I mean what components are part of (31.4gb-599mb)? How can i check that myself? Can... (3 Replies)
Discussion started by: kunwar
3 Replies
LEARN ABOUT HPUX
swapmem_on
swapmem_on(5) OBSOLETE swapmem_on(5)
NAME
swapmem_on - OBSOLETE kernel tunable parameter
DESCRIPTION
The tunable is obsolete. Processes will always be allowed to use pseudo-swap space if it is available.
In previous versions of HP-UX, system configuration required sufficient physical swap space for the maximum possible number of processes on
the system. This is because HP-UX reserves swap space for a process when it is created, to ensure that a running process never needs to be
killed due to insufficient swap.
This was difficult, however, for systems needing gigabytes of swap space with gigabytes of physical memory, and those with workloads where
the entire load would always be in core. This tunable was created to allow system swap space to be less than core memory. To accomplish
this, a portion of physical memory is set aside as "pseudo-swap" space. While actual swap space is still available, processes still
reserve all the swap they will need at fork or execute time from the physical device or file system swap. Once this swap is completely
used, new processes do not reserve swap, and each page which would have been swapped to the physical device or file system is instead
locked in memory and counted as part of the pseudo-swap space.
WARNINGS
Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parameter values. After installation,
some tunable parameters may no longer be at the default or recommended values. For information about the effects of installation on tun-
able values, consult the documentation for the kernel software being installed. For information about optional kernel software that was
factory installed on your system, see at
AUTHOR
was developed by HP.
Tunable Kernel Parameters swapmem_on(5)