Imported Upstream version 5.18.0.246

Former-commit-id: 0c7ce5b1a7851e13f22acfd379b7f9fb304e4833

external/llvm/utils/lit/examples/many-tests/README.txt

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+========================
+ Many Tests lit Example
+========================
+
+This directory contains a trivial lit test suite configuration that defines a
+custom test format which just generates a large (N=10000) number of tests that
+do a small amount of work in the Python test execution code.
+
+This test suite is useful for testing the performance of lit on large numbers of
+tests.

external/llvm/utils/lit/examples/many-tests/lit.cfg

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+# -*- Python -*-
+
+from lit import Test
+
+class ManyTests(object):
+    def __init__(self, N=10000):
+        self.N = N
+
+    def getTestsInDirectory(self, testSuite, path_in_suite,
+                            litConfig, localConfig):
+        for i in range(self.N):
+            test_name = 'test-%04d' % (i,)
+            yield Test.Test(testSuite, path_in_suite + (test_name,),
+                            localConfig)
+
+    def execute(self, test, litConfig):
+        # Do a "non-trivial" amount of Python work.
+        sum = 0
+        for i in range(10000):
+            sum += i
+        return Test.PASS,''
+
+config.test_format = ManyTests()