cmake reduce default TEST_THREADS to 1

CMakeLists.txt

@@ -162,13 +162,15 @@ add_custom_target(astcompare COMMAND ${CMAKE_SOURCE_DIR}/tools/astprint_test.sh
 
 # test
 enable_testing()
+set(TEST_THREADS 1)
+
 add_test(NAME lint COMMAND ${PYTHON_EXE} ${CMAKE_SOURCE_DIR}/tools/lint.py WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/src)
 add_test(NAME check-format COMMAND ${CMAKE_SOURCE_DIR}/tools/check_format.sh ${LLVM_TOOLS_BINARY_DIR}/clang-format WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/src)
 add_test(NAME gc_unittest COMMAND gc_unittest)
 add_test(NAME analysis_unittest COMMAND analysis_unittest)
-add_test(NAME pyston_defaults COMMAND ${PYTHON_EXE} ${CMAKE_SOURCE_DIR}/tools/tester.py -R ./pyston -j4 -k ${CMAKE_SOURCE_DIR}/test/tests)
-add_test(NAME pyston_max_compilation_tier COMMAND ${PYTHON_EXE} ${CMAKE_SOURCE_DIR}/tools/tester.py -R ./pyston -j4 -a -O -k ${CMAKE_SOURCE_DIR}/test/tests)
-add_test(NAME pyston_experimental_pypa_parser COMMAND ${PYTHON_EXE} ${CMAKE_SOURCE_DIR}/tools/tester.py -a -x -R ./pyston -j4 -a -n -k ${CMAKE_SOURCE_DIR}/test/tests)
+add_test(NAME pyston_defaults COMMAND ${PYTHON_EXE} ${CMAKE_SOURCE_DIR}/tools/tester.py -R ./pyston -j${TEST_THREADS} -k ${CMAKE_SOURCE_DIR}/test/tests)
+add_test(NAME pyston_max_compilation_tier COMMAND ${PYTHON_EXE} ${CMAKE_SOURCE_DIR}/tools/tester.py -R ./pyston -j${TEST_THREADS} -a -O -k ${CMAKE_SOURCE_DIR}/test/tests)
+add_test(NAME pyston_experimental_pypa_parser COMMAND ${PYTHON_EXE} ${CMAKE_SOURCE_DIR}/tools/tester.py -a -x -R ./pyston -j${TEST_THREADS} -a -n -k ${CMAKE_SOURCE_DIR}/test/tests)
 
 # format
 file(GLOB_RECURSE FORMAT_FILES ${CMAKE_SOURCE_DIR}/src/*.h ${CMAKE_SOURCE_DIR}/src/*.cpp)