git pull takes ~8 seconds on up-to-date Linux git tree

From: Markus Trippelsdorf <markus@trippelsdorf.de>
Date: Oct 4, 2012, 14:14 UTC
Message-ID: <20121004141454.GA246@x4>

Hi,

with current trunk I get the following on an up-to-date Linux tree:

markus@x4 linux % time git pull Already up-to-date. git pull 7.84s user 0.26s system 92% cpu 8.743 total

git version 1.7.12 is much quicker:

markus@x4 linux % time git pull Already up-to-date. git pull 0.10s user 0.02s system 16% cpu 0.740 total

perf shows for trunk:

    22.11%  git-merge  libz.so.1.2.7          [.] 0x00000000000073bc           
    22.03%        git  libz.so.1.2.7          [.] 0x0000000000007338           
    14.18%        git  libz.so.1.2.7          [.] inflate                      
    13.70%  git-merge  libz.so.1.2.7          [.] inflate                      
     9.18%        git  git                    [.] 0x00000000000ea391           
     8.56%  git-merge  git-merge              [.] 0x00000000000f0598           
     1.58%  git-merge  libz.so.1.2.7          [.] adler32                      
     1.52%        git  libz.so.1.2.7          [.] adler32                      
     0.59%        git  [kernel.kallsyms]      [k] clear_page_c

and for 1.7.12:

    39.29%        git  git                    [.] 0x00000000000b9fa8           
    12.16%        git  libz.so.1.2.7          [.] inflate                      
     8.67%        git  libz.so.1.2.7          [.] 0x000000000000a18e           
     8.49%  git-merge  git-merge              [.] 0x00000000000efa15           
     4.96%        git  libc-2.16.90.so        [.] memcpy@@GLIBC_2.14           
     2.63%        git  libc-2.16.90.so        [.] _int_malloc                  
     2.61%  git-merge  [kernel.kallsyms]      [k] clear_page_c                 
     2.32%        git  [kernel.kallsyms]      [k] clear_page_c                 
     2.04%        git  [kernel.kallsyms]      [k] filemap_fault                
     1.87%  git-merge  libc-2.16.90.so        [.] memcpy@@GLIBC_2.14

-- 
Markus