t/perf/p0006-read-tree-checkout.sh

   1 #!/bin/sh
   2 #
   3 # This test measures the performance of various read-tree
   4 # and checkout operations.  It is primarily interested in
   5 # the algorithmic costs of index operations and recursive
   6 # tree traversal -- and NOT disk I/O on thousands of files.
   7
   8 test_description="Tests performance of read-tree"
   9
  10 . ./perf-lib.sh
  11
  12 test_perf_default_repo
  13
  14 # If the test repo was generated by ./repos/many-files.sh
  15 # then we know something about the data shape and branches,
  16 # so we can isolate testing to the ballast-related commits
  17 # and setup sparse-checkout so we don't have to populate
  18 # the ballast files and directories.
  19 #
  20 # Otherwise, we make some general assumptions about the
  21 # repo and consider the entire history of the current
  22 # branch to be the ballast.
  23
  24 test_expect_success "setup repo" '
  25         if git rev-parse --verify refs/heads/p0006-ballast^{commit}
  26         then
  27                 echo Assuming synthetic repo from many-files.sh
  28                 git branch br_base            master
  29                 git branch br_ballast         p0006-ballast^
  30                 git branch br_ballast_alias   p0006-ballast^
  31                 git branch br_ballast_plus_1  p0006-ballast
  32                 git config --local core.sparsecheckout 1
  33                 cat >.git/info/sparse-checkout <<-EOF
  34                 /*
  35                 !ballast/*
  36                 EOF
  37         else
  38                 echo Assuming non-synthetic repo...
  39                 git branch br_base            $(git rev-list HEAD | tail -n 1)
  40                 git branch br_ballast         HEAD^ || error "no ancestor commit from current head"
  41                 git branch br_ballast_alias   HEAD^
  42                 git branch br_ballast_plus_1  HEAD
  43         fi &&
  44         git checkout -q br_ballast &&
  45         nr_files=$(git ls-files | wc -l)
  46 '
  47
  48 test_perf "read-tree br_base br_ballast ($nr_files)" '
  49         git read-tree -m br_base br_ballast -n
  50 '
  51
  52 test_perf "switch between br_base br_ballast ($nr_files)" '
  53         git checkout -q br_base &&
  54         git checkout -q br_ballast
  55 '
  56
  57 test_perf "switch between br_ballast br_ballast_plus_1 ($nr_files)" '
  58         git checkout -q br_ballast_plus_1 &&
  59         git checkout -q br_ballast
  60 '
  61
  62 test_perf "switch between aliases ($nr_files)" '
  63         git checkout -q br_ballast_alias &&
  64         git checkout -q br_ballast
  65 '
  66
  67 test_done