[PATCH] perf-test: add option to run perf

[David Bremner <david@tethera.net>]

Although the generation of perf data is not as slow as valgrind, it
seems simplest to re-use the machinery already there to save the logs
in a timestamped subdirectory.
---

I'm not sure about the use of --call-graph=lbr here. On the one hand,
the documentation mentions it depends on recent intel hardware. On the
other hand, fp does not work for me (just gives 00000000000) and dwarf
yields giant data files that take painfully long to run "perf report"
on.


 performance-test/perf-test-lib.sh | 27 +++++++++++++++++++++++----
 1 file changed, 23 insertions(+), 4 deletions(-)

diff --git a/performance-test/perf-test-lib.sh b/performance-test/perf-test-lib.sh
index b70288cc..216d1824 100644
--- a/performance-test/perf-test-lib.sh
+++ b/performance-test/perf-test-lib.sh
@@ -2,6 +2,7 @@
 
 corpus_size=large
 
+use_perf=0
 while test "$#" -ne 0
 do
 	case "$1" in
@@ -9,6 +10,10 @@ do
 		debug=t;
 		shift
 		;;
+	-p|--perf)
+		use_perf=1;
+		shift
+		;;
 	-s|--small)
 		corpus_size=small;
 		shift
@@ -127,10 +132,20 @@ notmuch_new_with_cache ()
     fi
 }
 
+make_log_dir () {
+    local timestamp=$(date +%Y%m%dT%H%M%S)
+    log_dir="${TEST_DIRECTORY}/log.$(basename $0)-$corpus_size-${timestamp}"
+    mkdir -p ${log_dir}
+}
+
 time_start ()
 {
     add_email_corpus
 
+    if [[ "X$use_perf" = "X1" ]]; then
+	make_log_dir
+    fi
+
     print_header
 
     notmuch_new_with_cache time_run
@@ -140,9 +155,7 @@ memory_start ()
 {
     add_email_corpus
 
-    local timestamp=$(date +%Y%m%dT%H%M%S)
-    log_dir="${TEST_DIRECTORY}/log.$(basename $0)-$corpus_size-${timestamp}"
-    mkdir -p ${log_dir}
+    make_log_dir
 
     notmuch_new_with_cache memory_run
 }
@@ -193,7 +206,13 @@ time_run ()
     printf "  %-22s" "$1"
     test_count=$(($test_count+1))
     if test "$verbose" != "t"; then exec 4>test.output 3>&4; fi
-    if ! eval >&3 "/usr/bin/time -f '%e\t%U\t%S\t%M\t%I/%O' $2" ; then
+    if [[ "X$use_perf" = "X1" ]]; then
+	command_str="perf record --call-graph=lbr -o ${log_dir}/${test_count}.perf $2"
+    else
+	command_str="/usr/bin/time -f '%e\t%U\t%S\t%M\t%I/%O' $2"
+    fi
+
+    if ! eval >&3 "$command_str" ; then
 	test_failure=$(($test_failure + 1))
 	return 1
     fi
-- 
2.30.2