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diff --git a/t/perf/p7821-grep-engines-fixed.sh b/t/perf/p7821-grep-engines-fixed.sh
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+#!/bin/sh
+
+test_description="Comparison of git-grep's regex engines with -F
+
+Set GIT_PERF_7821_GREP_OPTS in the environment to pass options to
+git-grep. Make sure to include a leading space,
+e.g. GIT_PERF_7821_GREP_OPTS=' -w'. See p7820-grep-engines.sh for more
+options to try.
+
+If GIT_PERF_7821_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
+
+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 'int' 'uncommon' 'æ'
+do
+ for engine in fixed basic extended perl
+ do
+ if test $engine = "perl" && ! test_have_prereq PCRE
+ then
+ prereq="PCRE"
+ else
+ prereq=""
+ fi
+ if ! test_have_prereq PERF_GREP_ENGINES_THREADS
+ then
+ test_perf $prereq "$engine grep$GIT_PERF_7821_GREP_OPTS $pattern" "
+ git -c grep.patternType=$engine grep$GIT_PERF_7821_GREP_OPTS $pattern >'out.$engine' || :
+ "
+ else
+ for threads in $GIT_PERF_GREP_THREADS
+ do
+ test_perf PTHREADS,$prereq "$engine grep$GIT_PERF_7821_GREP_OPTS $pattern with $threads threads" "
+ git -c grep.patternType=$engine -c grep.threads=$threads grep$GIT_PERF_7821_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_7821_GREP_OPTS $pattern" '
+ test_cmp out.fixed out.basic &&
+ test_cmp out.fixed out.extended &&
+ if test_have_prereq PCRE
+ then
+ test_cmp out.fixed 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_7821_GREP_OPTS $pattern under threading" "
+ test_cmp out.fixed.$threads out.basic.$threads &&
+ test_cmp out.fixed.$threads out.extended.$threads &&
+ if test_have_prereq PCRE
+ then
+ test_cmp out.fixed.$threads out.perl.$threads
+ fi
+ "
+ done
+ fi
+done
+
+test_done