run-tests: print number of tests and parallel process count

This seems like a useful output message to have.

I also sneak in a change to lower the parallel process count if it
is larger than the number of tests, as that makes no sense and output
saying we're running more tests in parallel than there exists tests would
be wonky.

Differential Revision: https://phab.mercurial-scm.org/D5070

tests/run-tests.py

@@ -2795,13 +2795,15 b' class TestRunner(object):'
 
             tests = [self._gettest(d, i) for i, d in enumerate(testdescs)]
 
+            jobs = min(len(tests), self.options.jobs)
+
             failed = False
             kws = self.options.keywords
             if kws is not None and PYTHON3:
                 kws = kws.encode('utf-8')
 
             suite = TestSuite(self._testdir,
-                              jobs=self.options.jobs,
+                              jobs=jobs,
                               whitelist=self.options.whitelisted,
                               blacklist=self.options.blacklist,
                               retest=self.options.retest,
@@ -2829,6 +2831,9 b' class TestRunner(object):'
                     assert self._installdir
                     self._installchg()
 
+                log('running %d tests using %d parallel processes' % (
+                    len(tests), jobs))
+
                 result = runner.run(suite)
 
             if result.failures:

tests/test-run-tests.t

@@ -7,6 +7,7 b' Avoid interference from actual test env:'
 Smoke test with install
 ============
   $ "$PYTHON" $TESTDIR/run-tests.py $HGTEST_RUN_TESTS_PURE -l
+  running 0 tests using 0 parallel processes 
   
   # Ran 0 tests, 0 skipped, 0 failed.
 
@@ -23,6 +24,7 b' error paths'
   $ ln -s `which true` hg
   $ "$PYTHON" $TESTDIR/run-tests.py --with-hg=./hg
   warning: --with-hg should specify an hg script
+  running 0 tests using 0 parallel processes 
   
   # Ran 0 tests, 0 skipped, 0 failed.
   $ rm hg
@@ -55,6 +57,7 b' an empty test'
 
   $ touch test-empty.t
   $ rt
+  running 1 tests using 1 parallel processes 
   .
   # Ran 1 tests, 0 skipped, 0 failed.
   $ rm test-empty.t
@@ -88,6 +91,7 b' a succesful test'
   > EOF
 
   $ rt
+  running 1 tests using 1 parallel processes 
   .
   # Ran 1 tests, 0 skipped, 0 failed.
 
@@ -102,6 +106,7 b' test churn with globs'
   >   | fo (re)
   > EOF
   $ rt test-failure.t
+  running 1 tests using 1 parallel processes 
   
   --- $TESTTMP/test-failure.t
   +++ $TESTTMP/test-failure.t.err
@@ -139,6 +144,7 b' test how multiple globs gets matched wit'
   >   value: * (glob)
   > EOF
   $ rt test-failure-globs.t
+  running 1 tests using 1 parallel processes 
   
   --- $TESTTMP/test-failure-globs.t
   +++ $TESTTMP/test-failure-globs.t.err
@@ -234,6 +240,7 b' test diff colorisation'
   >   missing (?)
   > EOF
   $ rt test-failure.t
+  running 1 tests using 1 parallel processes 
   
   --- $TESTTMP/test-failure.t
   +++ $TESTTMP/test-failure.t.err
@@ -292,6 +299,7 b' basic failing test'
   >>> fh.write(u'  l\u03b5\u03b5t\n'.encode('utf-8')) and None
 
   $ rt
+  running 3 tests using 1 parallel processes 
   
   --- $TESTTMP/test-failure.t
   +++ $TESTTMP/test-failure.t.err
@@ -323,6 +331,7 b' basic failing test'
 test --outputdir
   $ mkdir output
   $ rt --outputdir output
+  running 3 tests using 1 parallel processes 
   
   --- $TESTTMP/test-failure.t
   +++ $TESTTMP/output/test-failure.t.err
@@ -359,6 +368,7 b' test --outputdir'
 
 test --xunit support
   $ rt --xunit=xunit.xml
+  running 3 tests using 1 parallel processes 
   
   --- $TESTTMP/test-failure.t
   +++ $TESTTMP/test-failure.t.err
@@ -481,6 +491,7 b' test for --retest'
 ====================
 
   $ rt --retest
+  running 2 tests using 1 parallel processes 
   
   --- $TESTTMP/test-failure.t
   +++ $TESTTMP/test-failure.t.err
@@ -504,6 +515,7 b' test for --retest'
   $ mkdir output
   $ mv test-failure.t.err output
   $ rt --retest --outputdir output
+  running 2 tests using 1 parallel processes 
   
   --- $TESTTMP/test-failure.t
   +++ $TESTTMP/output/test-failure.t.err
@@ -528,17 +540,20 b' Selecting Tests To Run'
 successful
 
   $ rt test-success.t
+  running 1 tests using 1 parallel processes 
   .
   # Ran 1 tests, 0 skipped, 0 failed.
 
 success w/ keyword
   $ rt -k xyzzy
+  running 2 tests using 1 parallel processes 
   .
   # Ran 2 tests, 1 skipped, 0 failed.
 
 failed
 
   $ rt test-failure.t
+  running 1 tests using 1 parallel processes 
   
   --- $TESTTMP/test-failure.t
   +++ $TESTTMP/test-failure.t.err
@@ -559,6 +574,7 b' failed'
 
 failure w/ keyword
   $ rt -k rataxes
+  running 2 tests using 1 parallel processes 
   
   --- $TESTTMP/test-failure.t
   +++ $TESTTMP/test-failure.t.err
@@ -584,6 +600,7 b' Verify that when a process fails to star'
   >   $ echo 'abort: child process failed to start blah'
   > EOF
   $ rt test-serve-fail.t
+  running 1 tests using 1 parallel processes 
   
   --- $TESTTMP/test-serve-fail.t
   +++ $TESTTMP/test-serve-fail.t.err
@@ -614,6 +631,7 b' HGRCPATH to get a clean environment.'
   >   $ cat hg.pid >> \$DAEMON_PIDS
   > EOF
   $ rt test-serve-inuse.t
+  running 1 tests using 1 parallel processes 
   .
   # Ran 1 tests, 0 skipped, 0 failed.
   $ rm test-serve-inuse.t
@@ -623,6 +641,7 b' Running In Debug Mode'
 ======================
 
   $ rt --debug 2>&1 | grep -v pwd
+  running 2 tests using 1 parallel processes 
   + echo *SALT* 0 0 (glob)
   *SALT* 0 0 (glob)
   + echo babar
@@ -661,6 +680,7 b' Parallel runs'
   $ cp test-failure.t test-failure-copy.t
 
   $ rt --jobs 2 test-failure*.t -n
+  running 2 tests using 2 parallel processes 
   !!
   Failed test-failure*.t: output changed (glob)
   Failed test-failure*.t: output changed (glob)
@@ -670,6 +690,7 b' Parallel runs'
 
 failures in parallel with --first should only print one failure
   $ rt --jobs 2 --first test-failure*.t
+  running 2 tests using 2 parallel processes 
   
   --- $TESTTMP/test-failure*.t (glob)
   +++ $TESTTMP/test-failure*.t.err (glob)
@@ -701,6 +722,7 b' Interactive run'
 Refuse the fix
 
   $ echo 'n' | rt -i
+  running 2 tests using 1 parallel processes 
   
   --- $TESTTMP/test-failure.t
   +++ $TESTTMP/test-failure.t.err
@@ -734,6 +756,7 b' Refuse the fix'
 Interactive with custom view
 
   $ echo 'n' | rt -i --view echo
+  running 2 tests using 1 parallel processes 
   $TESTTMP/test-failure.t $TESTTMP/test-failure.t.err
   Accept this change? [n]* (glob)
   ERROR: test-failure.t output changed
@@ -746,6 +769,7 b' Interactive with custom view'
 View the fix
 
   $ echo 'y' | rt --view echo
+  running 2 tests using 1 parallel processes 
   $TESTTMP/test-failure.t $TESTTMP/test-failure.t.err
   
   ERROR: test-failure.t output changed
@@ -766,6 +790,7 b' Accept the fix'
   >   saved backup bundle to \$TESTTMP/*.hg (glob)
   > EOF
   $ echo 'y' | rt -i 2>&1
+  running 2 tests using 1 parallel processes 
   
   --- $TESTTMP/test-failure.t
   +++ $TESTTMP/test-failure.t.err
@@ -815,6 +840,7 b' Race condition - test file was modified '
   > EOF
 
   $ rt -i test-race.t
+  running 1 tests using 1 parallel processes 
   
   --- $TESTTMP/test-race.t
   +++ $TESTTMP/test-race.t.err
@@ -848,6 +874,7 b' When "#testcases" is used in .t files'
   > y
   > y
   > EOF
+  running 2 tests using 1 parallel processes 
   
   --- $TESTTMP/test-cases.t
   +++ $TESTTMP/test-cases.t#a.err
@@ -893,6 +920,7 b' When "#testcases" is used in .t files'
   >   B (b !)
   > EOF
   $ rt test-cases.t
+  running 2 tests using 1 parallel processes 
   ..
   # Ran 2 tests, 0 skipped, 0 failed.
 
@@ -911,6 +939,7 b' When using multiple dimensions of "#test'
   > #endif
   > EOF
   $ rt test-cases.t
+  running 4 tests using 1 parallel processes 
   ..
   --- $TESTTMP/test-cases.t
   +++ $TESTTMP/test-cases.t#b#c.err
@@ -939,6 +968,7 b' No Diff'
 ===============
 
   $ rt --nodiff
+  running 2 tests using 1 parallel processes 
   !.
   Failed test-failure.t: output changed
   # Ran 2 tests, 0 skipped, 1 failed.
@@ -947,6 +977,7 b' No Diff'
 
 test --tmpdir support
   $ rt --tmpdir=$TESTTMP/keep test-success.t
+  running 1 tests using 1 parallel processes 
   
   Keeping testtmp dir: $TESTTMP/keep/child1/test-success.t
   Keeping threadtmp dir: $TESTTMP/keep/child1 
@@ -963,6 +994,7 b' timeouts'
   > echo '#require slow' > test-slow-timeout.t
   > cat test-timeout.t >> test-slow-timeout.t
   $ rt --timeout=1 --slowtimeout=3 test-timeout.t test-slow-timeout.t
+  running 2 tests using 1 parallel processes 
   st
   Skipped test-slow-timeout.t: missing feature: allow slow tests (use --allow-slow-tests)
   Failed test-timeout.t: timed out
@@ -971,6 +1003,7 b' timeouts'
   [1]
   $ rt --timeout=1 --slowtimeout=3 \
   > test-timeout.t test-slow-timeout.t --allow-slow-tests
+  running 2 tests using 1 parallel processes 
   .t
   Failed test-timeout.t: timed out
   # Ran 2 tests, 0 skipped, 1 failed.
@@ -982,6 +1015,7 b' test for --time'
 ==================
 
   $ rt test-success.t --time
+  running 1 tests using 1 parallel processes 
   .
   # Ran 1 tests, 0 skipped, 0 failed.
   # Producing time report
@@ -992,6 +1026,7 b' test for --time with --job enabled'
 ====================================
 
   $ rt test-success.t --time --jobs 2
+  running 1 tests using 1 parallel processes 
   .
   # Ran 1 tests, 0 skipped, 0 failed.
   # Producing time report
@@ -1012,6 +1047,7 b' Skips'
   > #endif
   > EOF
   $ rt --nodiff
+  running 4 tests using 1 parallel processes 
   !.s.
   Skipped test-skip.t: missing feature: nail clipper
   Failed test-failure.t: output changed
@@ -1021,6 +1057,7 b' Skips'
 
   $ rm test-noskip.t
   $ rt --keyword xyzzy
+  running 3 tests using 1 parallel processes 
   .s
   Skipped test-skip.t: missing feature: nail clipper
   # Ran 2 tests, 2 skipped, 0 failed.
@@ -1028,6 +1065,7 b' Skips'
 Skips with xml
   $ rt --keyword xyzzy \
   >  --xunit=xunit.xml
+  running 3 tests using 1 parallel processes 
   .s
   Skipped test-skip.t: missing feature: nail clipper
   # Ran 2 tests, 2 skipped, 0 failed.
@@ -1045,6 +1083,7 b" Missing skips or blacklisted skips don't"
   $ echo test-failure.t > blacklist
   $ rt --blacklist=blacklist --json\
   >   test-failure.t test-bogus.t
+  running 2 tests using 1 parallel processes 
   ss
   Skipped test-bogus.t: Doesn't exist
   Skipped test-failure.t: blacklisted
@@ -1063,6 +1102,7 b' Whitelist trumps blacklist'
   $ echo test-failure.t > whitelist
   $ rt --blacklist=blacklist --whitelist=whitelist --json\
   >   test-failure.t test-bogus.t
+  running 2 tests using 1 parallel processes 
   s
   --- $TESTTMP/test-failure.t
   +++ $TESTTMP/test-failure.t.err
@@ -1086,10 +1126,12 b' Ensure that --test-list causes only the '
 be executed.
   $ echo test-success.t >> onlytest
   $ rt --test-list=onlytest
+  running 1 tests using 1 parallel processes 
   .
   # Ran 1 tests, 0 skipped, 0 failed.
   $ echo test-bogus.t >> anothertest
   $ rt --test-list=onlytest --test-list=anothertest
+  running 2 tests using 1 parallel processes 
   s.
   Skipped test-bogus.t: Doesn't exist
   # Ran 1 tests, 1 skipped, 0 failed.
@@ -1099,6 +1141,7 b' test for --json'
 ==================
 
   $ rt --json
+  running 3 tests using 1 parallel processes 
   
   --- $TESTTMP/test-failure.t
   +++ $TESTTMP/test-failure.t.err
@@ -1154,6 +1197,7 b' test for --json'
   $ rm -r output
   $ mkdir output
   $ rt --json --outputdir output
+  running 3 tests using 1 parallel processes 
   
   --- $TESTTMP/test-failure.t
   +++ $TESTTMP/output/test-failure.t.err
@@ -1215,6 +1259,7 b' Test that failed test accepted through i'
 
   $ cp test-failure.t backup
   $ echo y | rt --json -i
+  running 3 tests using 1 parallel processes 
   
   --- $TESTTMP/test-failure.t
   +++ $TESTTMP/test-failure.t.err
@@ -1269,6 +1314,7 b' backslash on end of line with glob match'
   > EOF
 
   $ rt test-glob-backslash.t
+  running 1 tests using 1 parallel processes 
   .
   # Ran 1 tests, 0 skipped, 0 failed.
 
@@ -1284,6 +1330,7 b' Add support for external test formatter'
 =======================================
 
   $ CUSTOM_TEST_RESULT=basic_test_result "$PYTHON" $TESTDIR/run-tests.py --with-hg=`which hg` "$@" test-success.t test-failure.t
+  running 2 tests using 1 parallel processes 
   
   # Ran 2 tests, 0 skipped, 0 failed.
   ON_START! <__main__.TestSuite tests=[<__main__.TTest testMethod=test-failure.t>, <__main__.TTest testMethod=test-success.t>]>
@@ -1306,6 +1353,7 b' Mercurial source tree.'
   >   foo
   > EOF
   $ rt test-hghave.t
+  running 1 tests using 1 parallel processes 
   .
   # Ran 1 tests, 0 skipped, 0 failed.
 
@@ -1334,6 +1382,7 b' running is placed.'
   >   # check-code - a style and portability checker for Mercurial
   > EOF
   $ rt test-runtestdir.t
+  running 1 tests using 1 parallel processes 
   .
   # Ran 1 tests, 0 skipped, 0 failed.
 
@@ -1351,6 +1400,7 b' test that TESTDIR is referred in PATH'
   >   hello world
   > EOF
   $ rt test-testdir-path.t
+  running 1 tests using 1 parallel processes 
   .
   # Ran 1 tests, 0 skipped, 0 failed.
 
@@ -1363,10 +1413,12 b' test support for --allow-slow-tests'
   >   pass
   > EOF
   $ rt test-very-slow-test.t
+  running 1 tests using 1 parallel processes 
   s
   Skipped test-very-slow-test.t: missing feature: allow slow tests (use --allow-slow-tests)
   # Ran 0 tests, 1 skipped, 0 failed.
   $ rt $HGTEST_RUN_TESTS_PURE --allow-slow-tests test-very-slow-test.t
+  running 1 tests using 1 parallel processes 
   .
   # Ran 1 tests, 0 skipped, 0 failed.
 
@@ -1377,6 +1429,7 b' support for running a test outside the c'
   >   pass
   > EOF
   $ rt nonlocal/test-is-not-here.t
+  running 1 tests using 1 parallel processes 
   .
   # Ran 1 tests, 0 skipped, 0 failed.
 
@@ -1394,6 +1447,7 b' support for automatically discovering te'
   $ cp tmp/test-uno.t test-solo.t
 
   $ rt tmp/ test-solo.t tmpp
+  running 5 tests using 1 parallel processes 
   .....
   # Ran 5 tests, 0 skipped, 0 failed.
   $ rm -rf tmp tmpp
@@ -1417,6 +1471,7 b' support for running run-tests.py from an'
 
   $ cd ..
   $ rt tmp/test-*.t
+  running 2 tests using 1 parallel processes 
   
   --- $TESTTMP/anothertests/tmp/test-folder-fail.t
   +++ $TESTTMP/anothertests/tmp/test-folder-fail.t.err
@@ -1447,6 +1502,7 b' support for bisecting failed tests autom'
   > EOF
   $ hg ci -m 'bad'
   $ rt --known-good-rev=0 test-bisect.t
+  running 1 tests using 1 parallel processes 
   
   --- $TESTTMP/anothertests/bisect/test-bisect.t
   +++ $TESTTMP/anothertests/bisect/test-bisect.t.err
@@ -1478,6 +1534,7 b' support bisecting a separate repo'
   $ hg commit -Am dependent test-bisect-dependent.t
 
   $ rt --known-good-rev=0 test-bisect-dependent.t
+  running 1 tests using 1 parallel processes 
   
   --- $TESTTMP/anothertests/bisect-dependent/test-bisect-dependent.t
   +++ $TESTTMP/anothertests/bisect-dependent/test-bisect-dependent.t.err
@@ -1500,6 +1557,7 b' support bisecting a separate repo'
   [2]
 
   $ rt --known-good-rev=0 --bisect-repo=../bisect test-bisect-dependent.t
+  running 1 tests using 1 parallel processes 
   
   --- $TESTTMP/anothertests/bisect-dependent/test-bisect-dependent.t
   +++ $TESTTMP/anothertests/bisect-dependent/test-bisect-dependent.t.err
@@ -1535,6 +1593,7 b" Test a broken #if statement doesn't brea"
   > EOF
   > done
   $ rt -j 2
+  running 5 tests using 2 parallel processes 
   ....
   # Ran 5 tests, 0 skipped, 0 failed.
   skipped: unknown feature: notarealhghavefeature
@@ -1572,6 +1631,7 b' Test cases in .t files'
   >   [1]
   > EOF
   $ rt
+  running 3 tests using 1 parallel processes 
   .
   --- $TESTTMP/anothertests/cases/test-cases-abc.t
   +++ $TESTTMP/anothertests/cases/test-cases-abc.t#B.err
@@ -1595,6 +1655,7 b' Test cases in .t files'
 --restart works
 
   $ rt --restart
+  running 2 tests using 1 parallel processes 
   
   --- $TESTTMP/anothertests/cases/test-cases-abc.t
   +++ $TESTTMP/anothertests/cases/test-cases-abc.t#B.err
@@ -1620,6 +1681,7 b' Test cases in .t files'
   $ mkdir output
   $ mv test-cases-abc.t#B.err output
   $ rt --restart --outputdir output
+  running 2 tests using 1 parallel processes 
   
   --- $TESTTMP/anothertests/cases/test-cases-abc.t
   +++ $TESTTMP/anothertests/cases/output/test-cases-abc.t#B.err
@@ -1657,12 +1719,14 b' Test TESTCASE variable'
   > #endif
   > EOF
   $ rt test-cases-ab.t
+  running 2 tests using 1 parallel processes 
   ..
   # Ran 2 tests, 0 skipped, 0 failed.
 
 Support running a specific test case
 
   $ rt "test-cases-abc.t#B"
+  running 1 tests using 1 parallel processes 
   
   --- $TESTTMP/anothertests/cases/test-cases-abc.t
   +++ $TESTTMP/anothertests/cases/test-cases-abc.t#B.err
@@ -1686,6 +1750,7 b' Support running a specific test case'
 Support running multiple test cases in the same file
 
   $ rt test-cases-abc.t#B test-cases-abc.t#C
+  running 2 tests using 1 parallel processes 
   
   --- $TESTTMP/anothertests/cases/test-cases-abc.t
   +++ $TESTTMP/anothertests/cases/test-cases-abc.t#B.err
@@ -1709,6 +1774,7 b' Support running multiple test cases in t'
 Support ignoring invalid test cases
 
   $ rt test-cases-abc.t#B test-cases-abc.t#D
+  running 1 tests using 1 parallel processes 
   
   --- $TESTTMP/anothertests/cases/test-cases-abc.t
   +++ $TESTTMP/anothertests/cases/test-cases-abc.t#B.err
@@ -1743,6 +1809,7 b' Support running complex test cases names'
     simple
 
   $ rt test-cases-advanced-cases.t
+  running 3 tests using 1 parallel processes 
   
   --- $TESTTMP/anothertests/cases/test-cases-advanced-cases.t
   +++ $TESTTMP/anothertests/cases/test-cases-advanced-cases.t#case-with-dashes.err
@@ -1771,6 +1838,7 b' Support running complex test cases names'
   [1]
 
   $ rt "test-cases-advanced-cases.t#case-with-dashes"
+  running 1 tests using 1 parallel processes 
   
   --- $TESTTMP/anothertests/cases/test-cases-advanced-cases.t
   +++ $TESTTMP/anothertests/cases/test-cases-advanced-cases.t#case-with-dashes.err
@@ -1788,6 +1856,7 b' Support running complex test cases names'
   [1]
 
   $ rt "test-cases-advanced-cases.t#casewith_-.chars"
+  running 1 tests using 1 parallel processes 
   
   --- $TESTTMP/anothertests/cases/test-cases-advanced-cases.t
   +++ $TESTTMP/anothertests/cases/test-cases-advanced-cases.t#casewith_-.chars.err
@@ -1829,6 +1898,7 b' Test automatic pattern replacement'
   > EOF
 
   $ rt test-substitution.t
+  running 1 tests using 1 parallel processes 
   
   --- $TESTTMP/anothertests/cases/test-substitution.t
   +++ $TESTTMP/anothertests/cases/test-substitution.t.err
@@ -1853,5 +1923,6 b' Test automatic pattern replacement'
   > EOF
 
   $ rt --extra-config-opt extensions.purge= test-config-opt.t
+  running 1 tests using 1 parallel processes 
   .
   # Ran 1 tests, 0 skipped, 0 failed.