From 84cdfec03f8adfd891227cd2e44b744d0b55b2ff Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Dirk=20M=C3=BCller?= Date: Wed, 8 Nov 2023 23:31:44 +0100 Subject: [PATCH 4/4] Set compression level for zstd to level 10 This requires a good amount of saving due to larger dictionary size with only marginal more time effort for compression. decompression time is unaffected. --- src/compression_wrapper.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/src/compression_wrapper.c b/src/compression_wrapper.c index af06543..175806a 100644 --- a/src/compression_wrapper.c +++ b/src/compression_wrapper.c @@ -122,7 +122,16 @@ typedef struct { } XzFile; #ifdef WITH_ZSTD -#define CR_CW_ZSTD_COMPRESSION_LEVEL 9 + +/** level 10 or 11 are good choices for the XML files that we generate. + * level 10 requires ~ 18% more time with 1% saving over level 9 + * level 11 requires ~ 50% more time with 1.5% saving over level 9 + * level 12 requires ~ 65% more time with 1.5% saving over level 9 + * level 13 requires ~ 260% more time with 1.55% saving over level 9 +*/ + +#define CR_CW_ZSTD_COMPRESSION_LEVEL 10 + typedef struct { void *buffer; size_t buffer_size; -- 2.48.1