t4200: demonstrate rerere segfault on specially crafted merge

diff --git a/t/perf/p7820-grep-engines.sh b/t/perf/p7820-grep-engines.sh
index 62aba19e7609678795d632d402dfd047d61d60bb..8b09c5bf328b880b7bbe10f37c7356b785473384 100755 (executable)
--- a/t/perf/p7820-grep-engines.sh
+++ b/t/perf/p7820-grep-engines.sh
@@ -12,6 +12,9 @@ e.g. GIT_PERF_7820_GREP_OPTS=' -i'. Some options to try:
        -vi
        -vw
        -viw
+
+If GIT_PERF_GREP_THREADS is set to a list of threads (e.g. '1 4 8'
+etc.) we will test the patterns under those numbers of threads.
 "
 
 . ./perf-lib.sh
@@ -19,6 +22,11 @@ e.g. GIT_PERF_7820_GREP_OPTS=' -i'. Some options to try:
 test_perf_large_repo
 test_checkout_worktree
 
+if test -n "$GIT_PERF_GREP_THREADS"
+then
+       test_set_prereq PERF_GREP_ENGINES_THREADS
+fi
+
 for pattern in \
        'how.to' \
        '^how to' \
@@ -39,18 +47,42 @@ do
                else
                        prereq=""
                fi
-               test_perf $prereq "$engine grep$GIT_PERF_7820_GREP_OPTS '$pattern'" "
-                       git -c grep.patternType=$engine grep$GIT_PERF_7820_GREP_OPTS -- '$pattern' >'out.$engine' || :
-               "
-       done
-
-       test_expect_success "assert that all engines found the same for$GIT_PERF_7820_GREP_OPTS '$pattern'" '
-               test_cmp out.basic out.extended &&
-               if test_have_prereq PCRE
+               if ! test_have_prereq PERF_GREP_ENGINES_THREADS
                then
-                       test_cmp out.basic out.perl
+                       test_perf $prereq "$engine grep$GIT_PERF_7820_GREP_OPTS '$pattern'" "
+                               git -c grep.patternType=$engine grep$GIT_PERF_7820_GREP_OPTS -- '$pattern' >'out.$engine' || :
+                       "
+               else
+                       for threads in $GIT_PERF_GREP_THREADS
+                       do
+                               test_perf PTHREADS,$prereq "$engine grep$GIT_PERF_7820_GREP_OPTS '$pattern' with $threads threads" "
+                                       git -c grep.patternType=$engine -c grep.threads=$threads grep$GIT_PERF_7820_GREP_OPTS -- '$pattern' >'out.$engine.$threads' || :
+                               "
+                       done
                fi
-       '
+       done
+
+       if ! test_have_prereq PERF_GREP_ENGINES_THREADS
+       then
+               test_expect_success "assert that all engines found the same for$GIT_PERF_7820_GREP_OPTS '$pattern'" '
+                       test_cmp out.basic out.extended &&
+                       if test_have_prereq PCRE
+                       then
+                               test_cmp out.basic out.perl
+                       fi
+               '
+       else
+               for threads in $GIT_PERF_GREP_THREADS
+               do
+                       test_expect_success PTHREADS "assert that all engines found the same for$GIT_PERF_7820_GREP_OPTS '$pattern' under threading" "
+                               test_cmp out.basic.$threads out.extended.$threads &&
+                               if test_have_prereq PCRE
+                               then
+                                       test_cmp out.basic.$threads out.perl.$threads
+                               fi
+                       "
+               done
+       fi
 done
 
 test_done