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[PATCH 4/5] fetch-pack: sort the list of incoming refs

From
Jeff King <peff@peff.net>
Date
May 21, 2012, 22:19 UTC
Message-ID
<20120521221951.GD22914@sigill.intra.peff.net>
In-Reply-To
<20120521221417.GA22664@sigill.intra.peff.net>

Having the list sorted means we can avoid some quadratic algorithms when comparing lists.

These should typically be sorted already, but they do come from the remote, so let's be extra careful. Our ref-sorting implementation does a mergesort, so we do not have to care about performance degrading in the common case that the list is already sorted.

Signed-off-by: Jeff King <peff@peff.net>
---
 builtin/fetch-pack.c | 2 ++
 1 file changed, 2 insertions(+)
diff --git a/builtin/fetch-pack.c b/builtin/fetch-pack.c
index 3522d8e..bee329f 100644
--- a/builtin/fetch-pack.c
+++ b/builtin/fetch-pack.c
@@ -777,6 +777,8 @@ static struct ref *do_fetch_pack(int fd[2],
 	struct ref *ref = copy_ref_list(orig_ref);
 	unsigned char sha1[20];
 
+	sort_ref_list(&ref, ref_compare_name);
+
 	if (is_repository_shallow() && !server_supports("shallow"))
 		die("Server does not support shallow clients");
 	if (server_supports("multi_ack_detailed")) {

-- 
1.7.10.1.19.g711d603
Previous: Jeff KingNext: Jeff King
Message 12 of 46 in “remove_duplicates() in builtin/fetch-pack.c is O(N^2)”
  1. Michael HaggertyMay 21, 2012
  2. Junio C HamanoMay 21, 2012
  3. demerphqMay 21, 2012
  4. Jeff KingMay 21, 2012
  5. Jeff KingMay 21, 2012
  6. 1/5 fetch-pack: sort incoming headsJeff King, May 21, 2012
  7. Junio C HamanoMay 22, 2012
  8. Jeff KingMay 22, 2012
  9. Jeff KingMay 24, 2012
  10. 2/5 fetch-pack: avoid quadratic behavior in remove_duplicatesJeff King, May 21, 2012
  11. 3/5 add sorting infrastructure for list refsJeff King, May 21, 2012
  12. 4/5 fetch-pack: sort the list of incoming refsJeff King, May 21, 2012
  13. 5/5 fetch-pack: avoid quadratic loop in filter_refsJeff King, May 21, 2012
  14. Junio C HamanoMay 22, 2012
  15. Jeff KingMay 21, 2012
  16. Jeff KingMay 22, 2012
  17. Michael HaggertyMay 22, 2012
  18. Jeff KingMay 22, 2012
  19. Michael HaggertyMay 22, 2012
  20. Jeff KingMay 22, 2012
  21. Michael HaggertyMay 22, 2012
  22. Jeff KingMay 22, 2012
  23. Michael HaggertyMay 24, 2012
  24. Martin FickMay 25, 2012
  25. Jeff KingMay 25, 2012
  26. Martin FickMay 25, 2012
  27. Jeff KingMay 25, 2012
  28. Martin FickMay 25, 2012
  29. Jeff KingMay 25, 2012
  30. Nguyen Thai Ngoc DuyMay 22, 2012
  31. Michael HaggertyMay 22, 2012
  32. Jeff KingMay 22, 2012
  33. Junio C HamanoMay 22, 2012
  34. Jeff KingMay 22, 2012
  35. Michael HaggertyMay 24, 2012
  36. Nguyen Thai Ngoc DuyMay 23, 2012
  37. Junio C HamanoMay 22, 2012
  38. Martin FickMay 21, 2012
  39. Jeff KingMay 21, 2012
  40. Junio C HamanoMay 21, 2012
  41. Jeff KingMay 21, 2012
  42. Martin FickMay 22, 2012
  43. Jeff KingMay 22, 2012
  44. Martin FickMay 22, 2012
  45. Junio C HamanoMay 22, 2012
  46. Martin FickMay 23, 2012

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