Subject: [PATCH v4 2/2] p0005-status: time status on very large repo

From: [email-masked]
Date: Tue, 11 Apr 2017 20:08:02 +0000

From: Jeff Hostetler <[email-masked]>

Signed-off-by: Jeff Hostetler <[email-masked]>
---
 t/perf/p0005-status.sh | 51 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100755 t/perf/p0005-status.sh

diff --git a/t/perf/p0005-status.sh b/t/perf/p0005-status.sh
new file mode 100755
index 0000000..0469aee
--- /dev/null
+++ b/t/perf/p0005-status.sh
@@ -0,0 +1,51 @@
+#!/bin/sh
+##
+## This test measures the performance of various read-tree
+## and status operations.  It is primarily interested in
+## the algorithmic costs of index operations and recursive
+## tree traversal -- and NOT disk I/O on thousands of files.
+
+test_description="Tests performance of read-tree"
+
+. ./perf-lib.sh
+
+test_perf_default_repo
+
+## If the test repo was generated by ./repos/many-files.sh
+## then we know something about the data shape and branches,
+## so we can isolate testing to the ballast-related commits
+## and setup sparse-checkout so we don't have to populate
+## the ballast files and directories.
+##
+## Otherwise, we make some general assumptions about the
+## repo and consider the entire history of the current
+## branch to be the ballast.
+
+git branch | grep p0006-ballast >/dev/null 2>&1
+synthetic=$?
+if test "$synthetic" = 0
+then
+    echo Assuming synthetic repo from many-files.sh
+    git branch br_base            master
+    git branch br_ballast         p0006-ballast
+    echo '/*'          >.git/info/sparse-checkout
+    echo '!ballast/*' >>.git/info/sparse-checkout
+    git config --local core.sparsecheckout 1
+else
+    echo Assuming non-synthetic repo...
+    git branch br_base            $(git rev-list HEAD | tail -n 1)
+    git branch br_ballast         HEAD
+fi
+
+test_expect_success 'setup' '
+	git checkout -q br_ballast
+'
+
+nr_files=$(git ls-files | wc -l)
+
+test_perf "read-tree status br_ballast ($nr_files)" '
+	git read-tree HEAD &&
+	git status
+'
+
+test_done
-- 
2.9.3