I have noticed that when the shell scripts are down then the kernel usuage returns back to normal.
Can you suggest anything in a script that would then? The scripts are doing usual things like sqlplus calls, writing/reading from files, ls, ps commands - nothing out of the ordinary. These scripts are running 24/7.
sqlplus and sleeping 60 seconds (typically) is not out of the ordinary? How are you calling sqlplus? Most scripts that I see use something like this:
Code:
sqlplus us/pw <<EOF
...
EOF
Spawning sqlplus every 60 seconds with a login request takes time. You could try a sqlplus co-process and establish one connection for the life of your script.
Code:
sqlplus -s /nolog |&
print -p "connect un/pw"
Then you can use print -p and read -p to communicate to the resident sqlplus session.
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)
Hi,
We have AIX 5.1 machine of RAM 8 GB and paging space is 8GB. we are getting high memory usage of almost 99%.Can anybody please help in this ?
Partial vmstat o/p
kthr memory
----- -----------
r b avm fre
2 1 278727 1143
There is no paging issue.Becoz in... (5 Replies)
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)
I am running a Dell PE R815 with 4 x AMD 12 core CPUs with 128GB of RAM and a RAID 5 array of 6 SAS disks. This is an HPC application and is definitely CPU bound, however once I run 16 of these processes (thus pinning 16 cores) the work performed slows down dramatically, to maybe 5 or 10% of what... (2 Replies)
Hello all,
I am facing a memory related issue on my linux that is CentOS 4.0. What I see as an output of top command, free command is that memory usage is almost 90% which is quite high without much load on the system. This is continuously showing 90% or so of memory usage with top or free... (2 Replies)
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)
I have created one script and i have added it into cron to run after 10 mins. However I have noted that whenever that script runs, It causes CPU utilization of server to increase about 10-20 %
I have rechecked script and there is no way i can make changes, Script contain only 2-3 commands. So... (4 Replies)
hello all,
on linux servers sometimes any of these resources (cpu,memory,disk) get a spike when you are not in front of the server.
the duration of these spikes might be 5 mins or even whole weekend.
my question is there a good way of capturing the events that caused these issues ( cpu or... (5 Replies)
Hi Guys,
In my script i need to sleep for some seconds till the previous command exeuction is successful
#!/bin/bash
cp test.txt /direct/sub_dir
if ; then
echo "file copied"
else
echo "file not copied"
sleep 5
exit 1
fi
i need to sleep for 5 seconds if the copy command... (7 Replies)
Discussion started by: Master_Mind
7 Replies
LEARN ABOUT ULTRIX
sleep
sleep(3) Library Functions Manual sleep(3)Name
sleep - suspend execution for interval
Syntax
unsigned
sleep(seconds)
unsigned seconds;
Description
The current process is suspended from execution for the number of seconds specified by the argument. The actual suspension time may be up
to 1 second less than that requested, because scheduled wakeups occur at fixed 1-second intervals, and an arbitrary amount longer because
of other activity in the system.
The routine is implemented by setting an interval timer and pausing until it occurs. The previous state of this timer is saved and
restored. If the sleep time exceeds the time to the expiration of the previous timer, the process sleeps only until the signal would have
occurred, and the signal is sent 1 second later.
Return Values
The value returned by is the unslept amount(the requested time minus the time actually slept). This return value may be non-zero in cases
where the caller had an alarm set to go off earlier than the end of the requested time, or where was interrupted due to a caught signal(see
ENVIRONMENT below).
Environment
POSIX
SYSTEM_FIVE
When your program is compiled in POSIX or System V mode, the will be terminated by any caught signal. The function will return following
execution of the signal's catching routine.
See Alsosetitimer(2), sigpause(2)sleep(3)