Question 1

Is JavaFastPFOR thread-safe for multi-threaded applications?

Accepted Answer

Most codecs are thread-safe, but some are not; the documentation specifies that unless stated otherwise, codecs are thread-safe, but it's best to use one codec per thread or check individual codec specs to ensure safety, as mentioned in the thread safety section.

Question 2

How to compress sorted integer lists with JavaFastPFOR?

Accepted Answer

Use the differential CODECs in the package me.lemire.integercompression.differential, which are designed for sorted integers. Compress the deltas (differences between consecutive integers) for optimal performance, as shown in the examples folder and documentation.

Question 3

JavaFastPFOR vs LZ4 for compressing integer arrays?

Accepted Answer

JavaFastPFOR is specifically optimized for integer arrays and outperforms generic codecs like LZ4 in speed, especially for decompression, as noted in the benchmarks. However, LZ4 is better for mixed data types, while JavaFastPFOR excels in integer-specific scenarios.

Question 4

What Java version is needed for the latest JavaFastPFOR features?

Accepted Answer

Current development versions assume JDK 21 or better, with vectorized implementations requiring JDK 19+. Older releases support Java 7, so check the version compatibility based on your project's needs, as outlined in the requirements section.

Question 5

Can JavaFastPFOR compress floating-point numbers or strings?

Accepted Answer

No, JavaFastPFOR is designed exclusively for integer arrays. For other data types, you would need to convert them to integers first or use a different compression library, as it focuses on integer-specific compression algorithms.

Question 6

How to integrate JavaFastPFOR with Gradle or Maven?

Accepted Answer

It's available on Maven Central and JitPack; add the dependency as shown in the README—for Maven, use groupId 'me.lemire.integercompression', and for JitPack, follow the repository configuration steps provided.

Question 7

What are the alternatives to JavaFastPFOR in other programming languages?

Accepted Answer

For C++, there's FastPFor; for Go, encoding and intcomp libraries; for C#, CSharpFastPFOR. These are ports or similar libraries, but JavaFastPFOR remains the primary choice for Java environments, as referenced in the other recommended libraries section.

JavaFastPFOR

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