1) I have seen improvement in the compression ratio for gzip using zopfli. However, the again seems to limited by approximately 5%. Is there any mechanism by which compression ratio can be further improved. Are there any configuration parameters which can be changes in zopfli to improve compression ratio
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Yes.
gzip does not use zopfli, so you might be using pigz or something else. pigz provides options to change the tuning parameters of zopfli, which you might be able to use to improve compression on your particular data. Look at the --iterations, --maxsplits, --oneblock, and --first options of pigz.
Mark Adler
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Thanks...Are there any test which suggest improvement in compression ratio? I will try to compare the results with gzip and zopfli – Shailender Jain Feb 23 '18 at 06:27
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The only test is to compare the sizes of the results after compression. – Mark Adler Feb 23 '18 at 08:13
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i did a comparison, but could not see any difference in size. I used -11 option. Can you let me know if this is the correct option? – Shailender Jain Feb 24 '18 at 18:53
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Yes, those options must be used in combination with `-11`. – Mark Adler Feb 24 '18 at 22:48