+ temporary directories.
+--perf Run perf record in place of /usr/bin/time. Perf output can be
+ found in a log directory.
+--call-graph {fp,lbr,dwarf} Call graph option for perf record. Default is 'lbr'.
+
+When using the make targets, you can pass arguments to all test
+scripts by defining the make variable OPTIONS.
+
+Log Directory
+-------------
+
+The memory tests, and the time tests when option '--perf' is given
+save their output in a directory named as follows
+
+ log.$test_name-$corpus_size-$timestamp
+
+These directories are removed by "make clean".