Re: [PATCH 2/2] stash: use "stash--helper"

[Thomas Gummerer <t.gummerer@gmail.com>]

On 01/28, Stefan Beller wrote:
> On Thu, Jan 28, 2016 at 12:36 PM, Matthias Asshauer <mha1993@live.de> wrote:
> > From: Matthias Aßhauer <mha1993@live.de>
> >
> > Use the new "git stash--helper" builtin. It should be faster than the old shell code and is a first step to move
> > more shell code to C.
>
> You had some good measurements in the coverletter, which is not going to be
> recorded in the projects history. This part however would be part of the commit.
> So you could move the speed improvements here (as well as the other reasoning)
> on why this is a good idea. :)

In addition it would be nice to add a performance test in t/perf,
especially since it seems further improvements are planned.  That will
make it easy for everyone to reproduce the performance numbers for
different use-cases.

Matthias, feel free to squash the following (or something similar) in
when you re-roll.

diff --git a/t/perf/p3000-stash.sh b/t/perf/p3000-stash.sh
new file mode 100755
index 0000000..e6e1153
--- /dev/null
+++ b/t/perf/p3000-stash.sh
@@ -0,0 +1,20 @@
+#!/bin/sh
+
+test_description="Test performance of git stash"
+
+. ./perf-lib.sh
+
+test_perf_default_repo
+
+file=$(git ls-files | tail -n 30 | head -1)
+
+test_expect_success "prepare repository" "
+	echo x >$file
+"
+
+test_perf "stash/stash pop" "
+	git stash &&
+	git stash pop
+"
+
+test_done