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Check and confirm the default compression settings in ROOT 6

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    Authored by Yuriy Volkotrub

    ROOT script to verify the default compression settings for a newly created file. This script will create a file without specifying any compression settings, then print the compression level and algorithm used by default.

    For root-config --version 6.32.06 (setupATLAS -c el9) provides: Default Compression Level: 1; Default Compression Algorithm: Zlib

    Edited
    check_default_compression.C 812 B
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    // ROOT macro to check default compression settings
void check_default_compression() {
    TFile *file = new TFile("test_default_compression.root", "RECREATE");

    int compressionLevel = file->GetCompressionLevel();
    int compressionAlgorithm = file->GetCompressionAlgorithm();

    std::cout << "Default Compression Level: " << compressionLevel << std::endl;
    std::cout << "Default Compression Algorithm: ";
    if (compressionAlgorithm == 1) {
        std::cout << "Zlib" << std::endl;
    } else if (compressionAlgorithm == 2) {
        std::cout << "LZMA" << std::endl;
    } else if (compressionAlgorithm == 4) {
        std::cout << "LZ4" << std::endl;
    } else {
        std::cout << "Unknown" << std::endl;
    }

    file->Close();
    delete file;
}


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