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Turn off only one of many monitors

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Two MonitorsIf you have more than one monitor, you probably might to turn off one of them if it’s simply unnecesary. It’s likely that you simply turn off the monitor pushing the power button, but your computer always put a window, tool rule or message in the monitor off because it don’t have a way to know whether the monitor is off. You surely don’t want to turn off and turn on or plug in and unplug frecuently your data cable to prevent this behavior (it isn’t recommendable).

You can do this simple procedure on Ubuntu systems: Continue reading

Remotely Control Your Ubuntu PC from an Android Device

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icon_300We can use our Android device (wherever they are) to connect and control your Ubuntu PC as a TV Remote and even more.

Imagine you want to turning down the noisy music but you are in another room of your house, or you left your PC turning on and your wife said to you: “Turn off the PC whether you aren’t using it and even worse you’re resting, cold or trying to sleep”.
Maybe your forget to ran something or cancel something in your PC.

That do you think if you can do this activities just using your android device wherever you are?. Continue reading

CuaimaCrypt, a Strong Cryptographic Alternative

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cuaimaCryptI think CuaimaCrypt is one of best cypher ever designed because it have such a strong algorithm that can resist an quantum computer attacks.

For this reason, I’m currently working to supporting this project; consequently, I share this link with you in order to explain what I’m refer to.

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Go to Bolivartech article: CuaimaCrypt, a Strong Cryptographic Alternative

 

Jorge Fernandes is Bachelor in Computer Science experienced in telecommunications, security, banking and programmer since 1984. He works in Valhala Networks focused on high-level decisions about scientific and technological policies and strategies of projects oriented to develop web and standalone applications, as well as smart solutions at mobiles. He always oriented to produce innovator products.

java.lang.OutOfMemoryError and X options

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memoryOne common indication of a memory leak is the java.lang.OutOfMemoryError exception. Usually, this error is thrown when there is insufficient space to allocate an object in the Java heap and the garbage collector cannot make space to accommodate a new object, and the heap cannot be expanded further. Also, this error may be thrown when there is insufficient native memory to support the loading of a Java class.

If the java.lang.OutOfMemoryError is due to heap problem, a common solution to this error can be manage the memory allocation pool manually for a Java Virtual Machine by using x options previous to run you application.

The flag Xmx specifies the maximum memory allocation pool for a Java Virtual Machine (JVM), while Xms specifies the initial memory allocation pool.

This means that your JVM will be started with Xms amount of memory and will be able to use a maximum of Xmx amount of memory. For example, starting a JVM like below will start it with 128MB of memory, and will allow the process to use up to 1024MB of memory:

java -Xms128m -Xmx1024m

The memory flag can also be specified in multiple size units, such as kilobytes, megabytes, and so on.

-Xms1024k
-Xmx1024m
-Xmx2g

The default value of Xmx will depends on platform and amount of memory available in the system.

When using these settings, keep in mind that these settings are for the JVM’s heap, and that the JVM can/will use more memory than just the size allocated to the heap. From Oracle’s Documentation:

Note that the JVM uses more memory than just the heap. For example Java methods, thread stacks and native handles are allocated in memory separate from the heap, as well as JVM internal data structures.

Notice: The -X options are subject to change without notice.

 

Jorge Fernandes is Bachelor in Computer Science experienced in telecommunications, security, banking and programmer since 1984. He works in Valhala Networks focused on high-level decisions about scientific and technological policies and strategies of projects oriented to develop web and standalone applications, as well as smart solutions at mobiles. He always oriented to produce innovator products.

NSA Director says “Encryption is foundational to the future”

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mike-rogersSpeaking to the Atlantic Council, a Washington, D.C., National Security Agency (NSA) Director Adm. Mike Rogers stressed that the cybersecurity battles the U.S. is destined to fight call for more widespread use of encryption, not less. “What you saw at OPM, you’re going to see a whole lot more of,” he said, referring to the massive hack of the Office of Personnel Management involving the personal data about 20 million people who have gotten background checks.

Watch Rogers’ talk here…

Continue reading