General :: Reboot Timings In Enterprise RHEL 5.5
Aug 9, 2011
This is about an oracle application server running on RHEL platform(Linux prod.xyz.com 2.6.18-194.el5PAE #1 SMP Mon Mar 29 20:19:03 EDT 2010 i686 i686 i386 GNU/Linux). All of a sudden all the application services shut down abnormally on weekend. On the first day of the week, business users were unable to login as a result. For root cause investigation, we were unable to findout anything in the application logs. But were trying to get reboot/shutdown information from the system.....but we are bit confused with the info in /var/log/wtmp by using 'last' command(output given bellow):
[root@prod ~]# last reboot |head -2
reboot system boot 2.6.18-194.el5PA Mon Aug 8 11:26 (1+03:10)
reboot system boot 2.6.18-194.el5PA Sun Aug 7 17:27 (17:55)
We doubt the server might have gone down on Sunday(7th Aug) but there's also an entry of 8th Aug, on which day the server was running fine, no reboot/shutdown happened. If there any other way of getting info on reboot timings.
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Jan 13, 2011
So I updated my software using Yast. One of the updates failed to install. I rebooted and then was in black screen hell with the following information:
Neither the variables MOUSEDEVICE and MOUSETYPE nor the variable GPM_PARAM is set in /etc/sysconfig/mouse
Run 'yast mouse' to set up gpm
Starting hpssd: Checking/updating CPU microcode unused
Starting nfsboot (sm-notify) done
done
Loading keymap i386/qwert/uk.map.gz done
Loading compose table winkeys shiftctrl latin1.add done
Start Unicode mode done
Starting hotkey-setup done
[OK]
Starting cupsd done
Starting powersaved: ###################################
# ACPI system but acpid not running. #
# Start acpid first, then restart powersaved! #
############################################### skipped
Mount SMB/ CIFS File Systems unused
Executing suseRegister (looking for new update channels): skipped
Starting SSH daemon done
Starting ypbind.....................No domainname set skipped
Starting service automounter ("files nis" does not provide any mounts) skipped
Starting Firewall Initialization (phase 2 of 2) SuSEfirewallZ: Warning: ip6tables does not support state matching. Extended IPu6 support disabled.
SuSEfirewallz: Warning: no interface active done
Master Resource Control: runlevel 3 has been reached
Skipped services in runlevel 3: nfs gpm microcode powersaved smbfs suseRegister ypbind autofs
Welcome to SUSE Linux Enterprise Desktop 10 SP1 (i586) - Kernel 2.6.16.54-0.2.5-default (tty1).
linux-bvuz login: Starting ZENworks Management Daemon^[^[^[
I don't have a CD drive attached to the HP 2133.
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Aug 16, 2010
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May 25, 2010
I have a startup script placed in /etc/init.d wherein I make the following call:
nohup sudo -u myuser $CATALINA_HOME/bin/startup.sh 2>&1
This causes Tomcat to be run as myuser, which is expected. However after issuing the reboot command the system starts up and root is now the owner of this process. How can I force the process to be started off as myuser on reboot?
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Apr 28, 2011
I'm using 11.04 and when I boot I see post messages and then when it gets to grub I just see black screen with a monitor timing not supported issue. I have a geforce 6100 nforce 405 video card with a Dell U2311H monitor. It does boot to the desktop eventually, and everything from there on works as expected.
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Jul 25, 2010
I am runig a program on a server at my university that has 4 Dual-Core AMD Opteron(tm) Processor 2210 HE and the O.S. is Linux version 2.6.27.25-78.2.56.fc9.x86_64. My program implements Conways Game of Life and it runs using pthreads and openmp. I timed the parrallel part of the program using the getimeofday() function using 1-8 threads. But the timings don't seem right. I get the biggest time using 1 thread(as expected), then the time gets smaller. But the smallest time i get is when i use 4 threads.
Here is an example when i use an array 1000x1000.
Using 1 thread~9,62 sec, Using 2 Threads~4,73 sec, Using 3 ~ 3.64 sec, Using 4~2.99 sec, Using 5 ~4,19 sec, Using 6~3.84, Using 7~3.34, Using 8~3.12.The above timings are when i use pthreads. When i use openmp the timing are smaller but follow the same pattern.I expected that the time would decrease from 1-8 because of the 4 Dual core cpus? I thought that because there are 4 cpus with 2 cores each, 8 threads could run at the same time. Does it have to do with the operating system that the server runs?
Also i tested the same programs on another server that has 7 Dual-Core AMD Opteron(tm) Processor 8214 and runs Linux version 2.6.18-194.3.1.el5. There the timings i get are what i expected. The timings get smaller starting from 1(the biggest) to 8(smallest excecution time).The program implements the Game of Life correct, both using pthreads and openmp, i just cant figure out why the timings are like the example i posted. So in conclusion, my questions are:
1) The number of threads that can run at the same time on a system depends by the cores of the cpus?it depends only by the cpus although each cpu has more than one cores? It depends by all the previous and the Operating System?
2) Does it have to do with the way i divide the 1000x1000 array to the number of threads? But if i did then the openmp code wouldn't give the same pattern of timings?
3)What is the reason i might get such timmings?
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lvcreate -L 30G -n rawdevice2 VolGroup00
lvcreate -L 10G -n rawdevice3 VolGroup00
[code]...
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[Code]...
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[code]....
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