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Ivan Zahariev 2016-09-19 18:14:19 +03:00
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# Performance notes
Java can be (a lot) faster than what we see it with its default interpeter:
* Initial heap size -- setting this larger than the default value will allow the ArrayList to grow more efficiently by pre-allocating a memory block from the system. The "java" command-line argument is "-Xms500m".
* Heap and GC tuning -- we can control the ratio between the old and young generation. The "java" command-line argument is "-XX:NewRatio=1".
Java can be (a lot) faster than what we see it with its default interpeter settings:
* Initial heap size -- setting this larger than the default value will allow the ArrayList to grow more efficiently by pre-allocating a bigger memory block from the system. The "java" command-line argument is "-Xms500m".
* Heap and GC tuning -- we can control the ratio between the old and young generations. The "java" command-line argument is "-XX:NewRatio=1".
* Skip the unneeded boxing/unboxing -- this requires a more native Java implementation. See the source code of "[primes-alt.java](../primes-alt.java)".
Those tweaks are not included in the Java benchmark test, because I wanted to test the default languages setup. I don't aim to fine-tune any of the implementations by optimizing them for the current task/algorithm. This is a generic test, not an attempt to complete the current task in the fastest possible way for each programming language.
These tweaks are not included in the Java benchmark test, because I wanted to test the default languages setup. I don't aim to fine-tune any of the implementations by optimizing them for the current task/algorithm. This is a generic test, not an attempt to complete the current task in the fastest possible way for each programming language.