cc4d2c3ef6
Resolves: RHEL-67689 Specifies git VCS for `%autosetup` because zstd tests contain binary data and their patch cannot be applied by the `patch` tool which is used by default.
38 lines
1.2 KiB
Diff
38 lines
1.2 KiB
Diff
From 84cdfec03f8adfd891227cd2e44b744d0b55b2ff Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Dirk=20M=C3=BCller?= <dirk@dmllr.de>
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Date: Wed, 8 Nov 2023 23:31:44 +0100
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Subject: [PATCH 4/4] Set compression level for zstd to level 10
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This requires a good amount of saving due to larger dictionary
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size with only marginal more time effort for compression. decompression
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time is unaffected.
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---
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src/compression_wrapper.c | 11 ++++++++++-
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1 file changed, 10 insertions(+), 1 deletion(-)
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diff --git a/src/compression_wrapper.c b/src/compression_wrapper.c
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index af06543..175806a 100644
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--- a/src/compression_wrapper.c
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+++ b/src/compression_wrapper.c
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@@ -122,7 +122,16 @@ typedef struct {
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} XzFile;
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#ifdef WITH_ZSTD
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-#define CR_CW_ZSTD_COMPRESSION_LEVEL 9
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+
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+/** level 10 or 11 are good choices for the XML files that we generate.
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+ * level 10 requires ~ 18% more time with 1% saving over level 9
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+ * level 11 requires ~ 50% more time with 1.5% saving over level 9
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+ * level 12 requires ~ 65% more time with 1.5% saving over level 9
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+ * level 13 requires ~ 260% more time with 1.55% saving over level 9
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+*/
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+
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+#define CR_CW_ZSTD_COMPRESSION_LEVEL 10
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+
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typedef struct {
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void *buffer;
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size_t buffer_size;
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--
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2.48.1
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