Add release branch performance job

tools/internal_ci/linux/grpc_full_performance_release.cfg

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+# Copyright 2017 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Config file for the internal CI (in protobuf text format)
+
+# Location of the continuous shell script in repository.
+build_file: "grpc/tools/internal_ci/linux/grpc_full_performance_release.sh"
+timeout_mins: 600
+action {
+  define_artifacts {
+    regex: "**/*sponge_log.xml"
+    regex: "**/perf_reports/**"
+  }
+}

tools/internal_ci/linux/grpc_full_performance_release.sh

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+#!/usr/bin/env bash
+# Copyright 2017 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+set -ex
+
+# Enter the gRPC repo root
+cd $(dirname $0)/../../..
+
+source tools/internal_ci/helper_scripts/prepare_build_linux_perf_multilang_rc
+
+# run 8core client vs 8core server
+tools/run_tests/run_performance_tests.py \
+    -l c++ csharp ruby java python go php7 php7_protobuf_c \
+    --netperf \
+    --category scalable \
+    --remote_worker_host grpc-kokoro-performance-server-8core grpc-kokoro-performance-client-8core grpc-kokoro-performance-client2-8core \
+    -u kbuilder \
+    --bq_result_table performance_released.performance_experiment \
+    --xml_report reports/8core/sponge_log.xml \
+    || EXIT_CODE=1
+
+# prevent pushing leftover build files to remote hosts in the next step.
+git clean -fdxq -e reports
+
+# scalability with 32cores (and upload to a different BQ table)
+tools/run_tests/run_performance_tests.py \
+    -l c++ java csharp go \
+    --netperf \
+    --category scalable \
+    --remote_worker_host grpc-kokoro-performance-server-32core grpc-kokoro-performance-client-32core grpc-kokoro-performance-client2-32core \
+    -u kbuilder \
+    --bq_result_table performance_released.performance_experiment_32core \
+    --xml_report reports/32core/sponge_log.xml \
+    || EXIT_CODE=1
+
+# prevent pushing leftover build files to remote hosts in the next step.
+git clean -fdxq -e reports
+
+# selected scenarios on Windows
+tools/run_tests/run_performance_tests.py \
+    -l csharp \
+    --category scalable \
+    --remote_worker_host grpc-kokoro-performance-windows1 grpc-kokoro-performance-windows2 \
+    --bq_result_table performance_released.performance_experiment_windows \
+    --xml_report reports/windows/sponge_log.xml \
+    || EXIT_CODE=1
+
+exit $EXIT_CODE