decompress_bunzip2: add profiling data to comment. no code changes

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/archival/libunarchive/decompress_bunzip2.c b/archival/libunarchive/decompress_bunzip2.c
index 00ec47c75..2fa0f898a 100644
--- a/archival/libunarchive/decompress_bunzip2.c
+++ b/archival/libunarchive/decompress_bunzip2.c
@@ -20,6 +20,17 @@
         the Burrows-Wheeler transformation.  Much of that time is delay
         resulting from cache misses.
 
+        (2010 update by vda: profiled "bzcat <84mbyte.bz2 >/dev/null"
+        on x86-64 CPU with L2 > 1M: get_next_block is hotter than read_bunzip:
+        %time seconds   calls function
+        71.01   12.69     444 get_next_block
+        28.65    5.12   93065 read_bunzip
+        00.22    0.04 7736490 get_bits
+        00.11    0.02      47 dealloc_bunzip
+        00.00    0.00   93018 full_write
+        ...)
+
+
         I would ask that anyone benefiting from this work, especially those
         using it in commercial products, consider making a donation to my local
         non-profit hospice organization (www.hospiceacadiana.com) in the name of