[B! Java][primitive] yassのブックマーク

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Javaとprimitiveに関するyassのブックマーク (4)

How to get C like performance in Java
Understanding how Core Java really works can help you write simpler, faster applications. OverviewJava has many areas which can be slow. However for every probl em there is a solution. Many solutions/hacks require working around Java's protections but if you need low level performance it is still possible. Java makes high level programming simpler and easier at the cost of making low level programm
yass 2013/08/16
" Don't use Selectors / they just add complexity. Most systems can handle 1K-10K threads efficiently / use Direct ByteBuffers and Object recycling techniques to minimise your object creation. By increasing the Eden size you can have an application which rarely GCs."

java

c

performance

unsafe

c10k

primitive

gc

thread

NIO

offheap
リンク
Which one is faster: Java heap or native memory? | MentaBlog
yass 2013/05/05
" Heap memory is always faster than direct memory for sequential access. For random access, heap memory is a little bit slower for big chunks of data, but not much. / The results actually make sense since crossing the JVM barrier must have a cost. "

java

offheap

comparison

unsafe

memory

latency

primitive
リンク
Java Serialization Performance: Methods, Performance, and Security
yass 2013/05/04
" If you have primitive array fields – always use bulk methods to process them. ByteBuffer bulk methods performance is close to those of Unsafe (but ByteBuffer are always a little slower). "

java

serialize

unsafe

offheap

primitive

array
リンク
How to calculate the memory usage of Java objects
yass 2013/03/03
" we take a general look at how to calculate the memory usage of a Java object, or at least an estimate of its usage. "

java

memory

class

primitive
リンク
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