"xargs tar cf backup.tar < $manifest" recreates the tar file with each
"batch" execed by xargs. In general this results in only a fraction of
the desired files being backed up.
---

I'm not sure if this is worth including in the point release: both the
risk and the benefit are relatively low since breaking the performance suite
probably mainly annoys me.

 performance-test/T00-new.sh | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/performance-test/T00-new.sh b/performance-test/T00-new.sh
index 53de1c27..de260b2d 100755
--- a/performance-test/T00-new.sh
+++ b/performance-test/T00-new.sh
@@ -5,16 +5,16 @@ test_description='notmuch new'
 . $(dirname "$0")/perf-test-lib.sh || exit 1
 
 uncache_database
-
 time_start
 
+manifest=$(mktemp manifestXXXXXX)
+find mail -type f ! -path 'mail/.notmuch/*' | sed -n '1~4 p' > $manifest
+xargs tar uf backup.tar < $manifest
+
 for i in $(seq 2 6); do
     time_run "notmuch new #$i" 'notmuch new'
 done
 
-manifest=$(mktemp manifestXXXXXX)
-
-find mail -type f ! -path 'mail/.notmuch/*' | sed -n '1~4 p' > $manifest
 # arithmetic context is to eat extra whitespace on e.g. some BSDs
 count=$((`wc -l < $manifest`))
 
@@ -26,8 +26,6 @@ perl -nle 'rename "$_.renamed", $_' $manifest
 
 time_run "new ($count mv back)" 'notmuch new'
 
-xargs tar cf backup.tar < $manifest
-
 perl -nle 'unlink $_; unlink $_.copy' $manifest
 
 time_run "new ($count rm)" 'notmuch new'
-- 
2.30.2
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