Posts Tagged ‘core’

Fix dosbox – setting: cycles=auto. If the game runs too fast try a fixed cycles amount in DOSBox’s options. Exit to error: DRC64:Unhandled memory reference

Thursday, October 12th, 2017

fix-dosbox-error-setting-cycles-auto-game-runs-too-fast-exit-err-drc64-unhandled-memory-reference

I've recently installed Debian GNU / Linux 9.1 Stretch and on Ubuntu 16.10 Yakkety Yak and as an old school true gamer addict decided to play some games to recall the good old memories from the past of the glorious DOS games times, when all was simple people was real and there was no terrible people dividers such as Facebook  / GooglePlus, no skype fuzzy craziness and no people watching all time at their mobile smart phones like zoombies .

Well anyways, so I wanted to play my favourite DOS games Terminal Velocity, StarGunner, Raptor, Heroes of Might and Magic 2, Doom II, Duke 3d etc. etc. the list goes on and on – BTW What's your favourite old school DOS Game??

So I issues in Terminal:

$ dosbox TV.EXE

DOSBox version 0.74
Copyright 2002-2010 DOSBox Team, published under GNU GPL.

CONFIG:Loading primary settings from config file /home/zetathon/.dosbox/dosbox-0.74.conf
MIXER:Got different values from SDL: freq 44100, blocksize 512
ALSA:Can't subscribe to MIDI port (65:0) nor (17:0)
MIDI:Opened device:none
DOSBox switched to max cycles, because of the setting: cycles=auto. If    the game runs too fast try a fixed cycles amount in DOSBox's options.
Exit to error: DRC64:Unhandled memory reference

So what is the solution to  Exit to error: DRC64:Unhandled memory reference
error and why it happens?

Well, as the error clearly states the whole problem
comes from a default dosbox dos emulator configuration, that's the
setting:
 

cycles=auto


Perhaps the CPU beat of a Core I7 CPUs is too strong for some of the old games which are expecting a slower PC with less memory that's why the exception

Exit to Error: DRC64:Unhandled memory reference
is spit out by Dosemu.

So how to solve DRC64:Unhandled memory reference dosemu error?

By default DOSBOX places its configuration at  Linux / BSD / *nix-es at home folder /dosbox – e.g. ~/.dosbox/ the naming of dosbox.conf might differ according to dosbox version and the respective Linux / BSD distro, on Debian and Ubuntu Linux usually the naming includes a version number.

On Debian 9 Strecth Linux dosbox config is at ~/.dosbox/dosbox-0.74.conf

Edit the file
 

$ vim ~/.dosbox/dosbox-0.74.conf


and change inside the value for:

core=auto

to

core=normal

Then give dosbox with the erroring game another try, it worked for me
for me and everything seemed to run fine.

I've only run a handful of games but so far it seems to be working well.

If it does work but performance is degraded and tooks a huch hit on Gameplay you better try to substitute
 

core=normal

to
 

core=simple


AND HOORAY IT WORKS AGAIN! THE GAME RUN SUCCESSFULLY JOY TO THE WORLD! 🙂

Fix “FAIL – Application at context path /application-name could not be started” deployment error in Tomcat manager

Thursday, October 1st, 2015

tomcat-manager-FAIL-Application-at-context-path-application-name-could-not-be-started-fix-solution-error

While deploying an environment called "Interim" which is pretty much like a testing Java application deployed from a Java EAR (Enterprise Archive) file from within a Tomcat Manager GUI web interface after stopping the application and trying to start it, the developers come across the error:

FAIL – Application at context path /application-name could not be started


The error puzzled me for a while until I checked the catalina.out I've seen a number of thrown Java Eceptions errors like:

Okt 01, 2015 10:48:46 AM org.springframework.web.context.ContextLoader initWebApplicationContext

Schwerwiegend: Context initialization failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.sun.xml.ws.transport.http.servlet.SpringBinding#2' defined in ServletContex

t resource [/WEB-INF/pp-server-beans.xml]: Cannot create inner bean ‘(inner bean)’ of type [org.jvnet.jax_ws_commons.spring.SpringService] while setting bean property

'service'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#33': FactoryBean threw exception on

 object creation; nested exception is java.lang.OutOfMemoryError: PermGen space

I've googled a bit about the error:

"FAIL – Application at context path /application-name could not be started"

and come across this Stackoverflow thread and followed suggested solution to fix web.xml tag closing error but it seems there was no such error in my case, I then also tried solution suggested by this thread (e.g. adding in logging.properties) file:
 

org.apache.catalina.core.ContainerBase.[Catalina].level = INFO
org.apache.catalina.core.ContainerBase.[Catalina].handlers = java.util.logging.ConsoleHandler

unfortunately this helped neither to solve the error when it is tried to be started from tomcat manager.

After asking for help a colleague Kostadin, he pointed me to take a closer look in the error (which is a clear indication) that the reserved space is not enough (see below err):
 

java.lang.OutOfMemoryError: PermGen space

And he pointed me then to Solution (which is to modify the present tomcat setenv.sh) settings which looked like this:

# Heap size settings

export JAVA_OPTS="-Xms2048M -Xmx2048M"

# SSCO test page parameter

export JAVA_OPTS="$JAVA_OPTS -DTS1A_TESTSEITE_CONFIG_PATH=test-myapplication.com"

# Default garbage collector settings

export JAVA_OPTS="$JAVA_OPTS -XX:MaxPermSize=128M"

# Aggressive garbage collector settings.

# Do not use! For testing purposes only!

#export JAVA_OPTS="$JAVA_OPTS -Xss128k -XX:ParallelGCThreads=20 -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:SurvivorRatio=8 -XX:TargetSurvivorRatio=90 -XX:MaxTenuringThreshold=31 -XX:+AggressiveOpts -XX:MaxPermSize=128M"

####### DO NOT CHANGE BELOW HERE #######

# Disable X11 usage

unset DISPLAY

export JAVA_OPTS="$JAVA_OPTS -Djava.awt.headless=true"

# Garbage collection log settings

export JAVA_OPTS="$JAVA_OPTS -verbose:gc -XX:+PrintGCTimeStamps -XX:+PrintGCDetails -Xloggc:/web/tomcat/current/logs/gc.log -XX:-TraceClassUnloading"

# Enable JMX console

export JAVA_OPTS="$JAVA_OPTS -Dcom.sun.management.jmxremote"

The solution is to to add following two options to export JAVA_OPTS (above options):

-XX:PermSize=512m -XX:MaxPermSize=512m


After modifications, my new line within setenv.sh looked like so:

JAVA_OPTS="-Xms2048M -Xmx2048M -XX:PermSize=512m -XX:MaxPermSize=512m"


Finally to make new JAVA_OPTS settings, I've restarted Tomcat with:

cd /web/tomcat/bin/
./shutdown.sh
sleep 5; ./startup.sh


And hooray it works fine thanks God! 🙂

Death Metal singing animals :)

Monday, February 20th, 2012

Alex, just passed me by few funny videos, with "animals singing death metal"

Death Metal Singing Rooster

This Rooster, should definitely contact Six Feet Under (SFU) 's vocalist – Chris Barnes for a solo album 😉

I guess this Camel should start innovative metal music fork to Grind Core or Noise Core metal genre sub-division 🙂


I'm sure you never imagined the donkey could be an awesome Metal singer, Well believe it or not it is a fact the donkey has a talent 🙂


This dog is quite experienced in Death Metal vocalist stage behaviour 😉

There is plenty of other Metal singing animals in Youtube, for more laugh check the related videos. Enjoy ! 🙂

How to convert Ogg Video (.ogv) to Flash video (.flv) on Linux and FreeBSD

Thursday, September 29th, 2011

ffmpeg is the de-facto standard for Video conversion on Linux and BSD platforms. I was more than happy to find out that ffmpeg is capable of converting an .ogv file format to .flv (Flash compressed Video).
Ogg Vorbis Video to Flash’s conversion on Linux is a real piece of cake with ffmpeg .
Here is how to convert .ogv to .flv:

debian:~# ffmpeg -i ogg_vorbis_video_to_convert_.ogv converted_ogg_vorbis_video_to_flash_video.flv
...

Conversion of a 14MB ogg vorbis video to flv took 28 seconds, the newly produced converted_ogg_vorbis_video_to_flash_video.flv has been reduced to a size of 9MB. This is on a system with 2 GB of memory and dual core 1.8 Ghz intel CPU.

Monitoring multi core / (multiple CPUs) servers with top, tload and on Linux

Thursday, March 17th, 2011

The default GNU / Linux top command does allow to see statistics on servers and systems with multiple CPUs.
This is quite beneficial especially on Linux systems which are not equipped with htop which does show statistics to the multiple-core system load.

To examine the multiple CPUs statistics with the default top command available on every Linux system and part of the procps/proc file system utilities

1. Start top:

linux:~# top

When the top system load statistics screen starts up refreshing,

2. press simply 1
You will notice all your system cpus to show up in the top head:

8 cpu top screen statistics on Linux

As I have started talking about top, a very useful way to use top to track processes which are causing a system high loads is:

linux:~# top -b -i

This command will run top in batch mode interactively and will show you statistics about the most crucial processes which does cause a server load, look over the output and you will get an idea about what is causing you server troubles.
Moreover if you’re a Linux console freak as me you will also probably want to take a look at tload

tload command is a part of the procps – /proc file system utilities and as you can read in the tload manual tload – graphic representation of system load average

Here is a picture to give you an idea on the console output of tload :

tload console/terminal system load statistics on Linux screenshot

Another tool that you might find very usefel is slabtop it’s again a part of the procps linux package.
slabtop – displays a listing of the top caches sorted by one of the listed sort criteria., in most of the cases the slabtop kernel cache monitoring tool won’t be necessary for the regular administrator, however on some servers it might help up to the administrator to resolve performance issues which are caused by the kernel as a bottleneck.
slabtop is also used as a tool by kernel developers to write and debug the Linux kernel.