Fix benchmark by making sure we use Python 3 (#9170)

The benchmark runs have been failing since we started requiring Python
3, so this changes fixes the benchmarks by ensuring we always use Python
3.

benchmarks/Makefile.am

@@ -165,7 +165,7 @@ python_add_init: protoc_middleman protoc_middleman2
 		done                                                           \
 	done
 
-python_cpp_pkg_flags = `pkg-config --cflags --libs python`
+python_cpp_pkg_flags = `pkg-config --cflags --libs python3`
 
 lib_LTLIBRARIES = libbenchmark_messages.la
 libbenchmark_messages_la_SOURCES = python/python_benchmark_messages.cc
@@ -186,7 +186,7 @@ python-pure-python-benchmark: python_add_init
 	@echo export DYLD_LIBRARY_PATH=$(top_srcdir)/src/.libs >> python-pure-python-benchmark
 	@echo export PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=\'python\' >> python-pure-python-benchmark
 	@echo cp $(srcdir)/python/py_benchmark.py tmp >> python-pure-python-benchmark
-	@echo python tmp/py_benchmark.py '$$@' >> python-pure-python-benchmark
+	@echo python3 tmp/py_benchmark.py '$$@' >> python-pure-python-benchmark
 	@chmod +x python-pure-python-benchmark
 
 python-cpp-reflection-benchmark: python_add_init
@@ -196,7 +196,7 @@ python-cpp-reflection-benchmark: python_add_init
 	@echo export DYLD_LIBRARY_PATH=$(top_srcdir)/src/.libs >> python-cpp-reflection-benchmark
 	@echo export PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=\'cpp\' >> python-cpp-reflection-benchmark
 	@echo cp $(srcdir)/python/py_benchmark.py tmp >> python-cpp-reflection-benchmark
-	@echo python tmp/py_benchmark.py '$$@' >> python-cpp-reflection-benchmark
+	@echo python3 tmp/py_benchmark.py '$$@' >> python-cpp-reflection-benchmark
 	@chmod +x python-cpp-reflection-benchmark
 
 python-cpp-generated-code-benchmark: python_add_init libbenchmark_messages.la
@@ -206,7 +206,7 @@ python-cpp-generated-code-benchmark: python_add_init libbenchmark_messages.la
 	@echo export DYLD_LIBRARY_PATH=$(top_srcdir)/src/.libs >> python-cpp-generated-code-benchmark
 	@echo export PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=\'cpp\' >> python-cpp-generated-code-benchmark
 	@echo cp $(srcdir)/python/py_benchmark.py tmp >> python-cpp-generated-code-benchmark
-	@echo python tmp/py_benchmark.py --cpp_generated '$$@' >> python-cpp-generated-code-benchmark
+	@echo python3 tmp/py_benchmark.py --cpp_generated '$$@' >> python-cpp-generated-code-benchmark
 	@chmod +x python-cpp-generated-code-benchmark
 
 python-pure-python: python-pure-python-benchmark

benchmarks/python/python_benchmark_messages.cc

@@ -7,13 +7,19 @@
 #include "datasets/google_message3/benchmark_message3.pb.h"
 #include "datasets/google_message4/benchmark_message4.pb.h"
 
-static PyMethodDef python_benchmark_methods[] = {
-    {NULL, NULL, 0, NULL}        /* Sentinel */
-};
-
+static struct PyModuleDef _module = {PyModuleDef_HEAD_INIT,
+                                     "libbenchmark_messages",
+                                     "Benchmark messages Python module",
+                                     -1,
+                                     NULL,
+                                     NULL,
+                                     NULL,
+                                     NULL,
+                                     NULL};
 
+extern "C" {
 PyMODINIT_FUNC
-initlibbenchmark_messages() {
+PyInit_libbenchmark_messages() {
   benchmarks::BenchmarkDataset().descriptor();
   benchmarks::proto3::GoogleMessage1().descriptor();
   benchmarks::proto2::GoogleMessage1().descriptor();
@@ -21,9 +27,6 @@ initlibbenchmark_messages() {
   benchmarks::google_message3::GoogleMessage3().descriptor();
   benchmarks::google_message4::GoogleMessage4().descriptor();
 
-  PyObject *m;
-
-  m = Py_InitModule("libbenchmark_messages", python_benchmark_methods);
-  if (m == NULL)
-      return;
+  return PyModule_Create(&_module);
+}
 }

benchmarks/util/result_parser.py

@@ -61,7 +61,7 @@ def __parse_cpp_result(filename):
     return
   if filename[0] != '/':
     filename = os.path.dirname(os.path.abspath(__file__)) + '/' + filename
-  with open(filename, "rb") as f:
+  with open(filename, encoding="utf-8") as f:
     results = json.loads(f.read())
     for benchmark in results["benchmarks"]:
       data_filename = "".join(
@@ -96,7 +96,7 @@ def __parse_synthetic_result(filename):
     return
   if filename[0] != "/":
     filename = os.path.dirname(os.path.abspath(__file__)) + "/" + filename
-  with open(filename, "rb") as f:
+  with open(filename, encoding="utf-8") as f:
     results = json.loads(f.read())
     for benchmark in results["benchmarks"]:
       __results.append({
@@ -126,7 +126,7 @@ def __parse_python_result(filename):
     return
   if filename[0] != '/':
     filename = os.path.dirname(os.path.abspath(__file__)) + '/' + filename
-  with open(filename, "rb") as f:
+  with open(filename, encoding="utf-8") as f:
     results_list = json.loads(f.read())
     for results in results_list:
       for result in results:
@@ -176,7 +176,7 @@ def __parse_java_result(filename):
     return
   if filename[0] != '/':
     filename = os.path.dirname(os.path.abspath(__file__)) + '/' + filename
-  with open(filename, "rb") as f:
+  with open(filename, encoding="utf-8") as f:
     results = json.loads(f.read())
     for result in results:
       total_weight = 0
@@ -212,7 +212,7 @@ def __parse_go_result(filename):
     return
   if filename[0] != '/':
     filename = os.path.dirname(os.path.abspath(__file__)) + '/' + filename
-  with open(filename, "rb") as f:
+  with open(filename, encoding="utf-8") as f:
     for line in f:
       result_list = re.split(r"[\ \t]+", line)
       if result_list[0][:9] != "Benchmark":
@@ -252,7 +252,7 @@ def __parse_custom_result(filename, language):
     return
   if filename[0] != '/':
     filename = os.path.dirname(os.path.abspath(__file__)) + '/' + filename
-  with open(filename, "rb") as f:
+  with open(filename, encoding="utf-8") as f:
     results = json.loads(f.read())
     for result in results:
       _, avg_size = __get_data_size(result["filename"])

kokoro/linux/benchmark/run.sh

@@ -23,8 +23,10 @@ popd
 ./configure CXXFLAGS="-fPIC -O2"
 make -j8
 pushd python
-python setup.py build --cpp_implementation
-pip install . --user
+virtualenv -p python3 env
+source env/bin/activate
+python3 setup.py build --cpp_implementation
+pip3 install --install-option="--cpp_implementation" .
 popd
 
 # build and run Python benchmark
@@ -91,7 +93,7 @@ cat tmp/python_result.json
 # print the postprocessed results to the build job log
 # TODO(jtattermusch): re-enable uploading results to bigquery (it is currently broken)
 make python_add_init
-env LD_LIBRARY_PATH="${repo_root}/src/.libs" python -m util.result_parser \
+env LD_LIBRARY_PATH="${repo_root}/src/.libs" python3 -m util.result_parser \
 	-cpp="../tmp/cpp_result.json" -java="../tmp/java_result.json" -python="../tmp/python_result.json"
 popd