By Kenneth B Stolarsky
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Additional resources for Algebraic numbers and Diophantine approximation
This is useful if your program does not take sufficient time to run to create the dump file using jmap command. heap_dump myHeap The dump file is now ready to be used by jhat. Use the following command to start jhat: jhat myHeap JAVA TOOLS 13 If everything goes right, the following message appears: Reading from myHeap... Dump file created Tue Jan 27 12:03:28 IST 2015 Snapshot read, resolving... Resolving 5941 objects... Chasing references, expect 1 dots. Eliminating duplicate references. Snapshot resolved.
A web browser may then be used to get desired data. The web server supports a few pre-designed queries as well as custom queries written in OQL (Object Query Language), which is a language similar to SQL to query heap dumps. java program to demonstrate this tool. To use jhat, we have to dump heap information in a file. There are several ways to generate a java heap dump: • • • • • Use jmap with -dump option to obtain a heap dump at runtime; Use jconsole option to obtain a heap dump via HotSpotDiagnosticMXBean at runtime; Use java by specifying -XX:+HeapDumpOnOutOfMemoryError VM option; Heap dump will be generated when OutOfMemoryError is thrown; Use jcmd; Use hprof.
The last link is interesting as it allows us to write custom queries using OQL. The jhat also provides a useful page to get help on OQL. 6 JDB A good programmer should have good skills to debug programs. This skill enables the programmer to find any subtle bugs or defects which are not visible during code review or comes when a particular situation occurs and removes them. The old method of debugging that uses print statements here and there in the program makes the program simply ugly. Although, they can be removed before delivering the program finally, they make a simple program almost unreadable.
Algebraic numbers and Diophantine approximation by Kenneth B Stolarsky