I watched a few presentation about jvm and a garbage collection. Today I will write about topics which are new for me.
I didn't know that:...
1. JVM have a lot of parameters (a few hundreds) and some of them are manageable. It is possible to change their state in runtime (about hundred).
2. Bytecode is compiled by JIT into processor code in runtime but there are a few types of compiled code, depending of:
- free memory for compiled code - every platform have other size of memory
- frequency of usage - often used part of code is better optimised then used onece,
- count of processors and cores,
- complication of code's part.
3. Log4J retrieve logged line of code by dumping a stack trace. It is an expensive operation.
4. New one GC called G1 solve a fragmentation of data by splitting memory area into blocks.
I didn't know that:...
1. JVM have a lot of parameters (a few hundreds) and some of them are manageable. It is possible to change their state in runtime (about hundred).
2. Bytecode is compiled by JIT into processor code in runtime but there are a few types of compiled code, depending of:
- free memory for compiled code - every platform have other size of memory
- frequency of usage - often used part of code is better optimised then used onece,
- count of processors and cores,
- complication of code's part.
3. Log4J retrieve logged line of code by dumping a stack trace. It is an expensive operation.
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