Menu
The base form of the verb is do. The past simple form, did, is the same throughout. The present participle is doing. The past participle is done.
“Does” is used for singular subjects like “he,” “she,” “it,” “this,” “that,” or “John.” “Do” is used to form imperative sentences, or commands. Example: Do your homework. “Does” is never used to form imperative sentences.
Sometimes "do", "does" and "did" are used in positive sentences to give special emphasis that what you say is true, despite what the other person thinks. Note that when speaking, the word (do/does/did) is stressed with the voice. For example: I do really want to go. I did study for the test.
To make a question in the Past Tense in English we normally put the auxiliary DID at the beginning of the question or before the main subject. DID is used with regular AND irregular verbs in English. Both Do and Does in present tense questions become Did in past tense questions.
The permanent space is where the classes, methods, internalized strings, and similar objects used by the VM are stored and never deallocated (hence the name).
This Oracle article succinctly presents the working and parameterization of the HotSpot GC and advises you to augment this space if you load many classes (this is typically the case for application servers and some IDE like Eclipse) :
The permanent generation does not have a noticeable impact on garbage collector performance for most applications. However, some applications dynamically generate and load many classes; for example, some implementations of JavaServer Pages (JSP) pages. These applications may need a larger permanent generation to hold the additional classes. If so, the maximum permanent generation size can be increased with the command-line option -XX:MaxPermSize=.
Note that this other Oracle documentation lists the other HotSpot arguments.
Update : Starting with Java 8, both the permgen space and this setting are gone. The memory model used for loaded classes and methods is different and isn't limited (with default settings). You should not see this error any more.
-XX:PermSize -XX:MaxPermSize are used to set size for Permanent Generation.
Permanent Generation: The Permanent Generation is where class files are kept. These are the result of compiled classes and JSP pages. If this space is full, it triggers a Full Garbage Collection. If the Full Garbage Collection cannot clean out old unreferenced classes and there is no room left to expand the Permanent Space, an Out‐of‐ Memory error (OOME) is thrown and the JVM will crash.
In Java 8 that parameter is commonly used to print a warning message like this one:
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=512m; support was removed in 8.0
The reason why you get this message in Java 8 is because Permgen has been replaced by Metaspace to address some of PermGen's drawbacks (as you were able to see for yourself, one of those drawbacks is that it had a fixed size).
FYI: an article on Metaspace: http://java-latte.blogspot.in/2014/03/metaspace-in-java-8.html
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With