Run performance test for metrics

Before this patch, performance tests ran together with unit and
integration with `--coverage` flag. Coverage analysis cropped the
result of performance tests to 10-15 times. For metrics integration
it resulted in timeout errors and drop of performance which is not
reproduces with coverage disabled. Moreover, before this patch log
capture was disabled and performance tests did not displayed any
results after run.

After this patch, `make -C build coverage` will run lightweight
version of performance test. `make -C build performance` will run real
performance tests.

This path also reworks current performance test. It adds new cases to
compare module performance with or without statistics, statistic
wrappers and compare different metrics drivers and reports new info:
average call time and max call time.

Closes #233, follows up #224

.github/workflows/test_on_push.yaml

@@ -16,7 +16,11 @@ jobs:
         tarantool-version: ["1.10.6", "1.10", "2.2", "2.3", "2.4", "2.5", "2.6", "2.7", "2.8"]
         metrics-version: [""]
         remove-merger: [false]
+        perf-test: [false]
         include:
+          - tarantool-version: "1.10"
+            metrics-version: "0.12.0"
+            perf-test: true
           - tarantool-version: "2.7"
             remove-merger: true
           - tarantool-version: "2.8"
@@ -26,6 +30,7 @@ jobs:
           - tarantool-version: "2.8"
             coveralls: true
             metrics-version: "0.12.0"
+            perf-test: true
       fail-fast: false
     runs-on: [ubuntu-latest]
     steps:
@@ -72,6 +77,10 @@ jobs:
       - name: Run tests and code coverage analysis
         run: make -C build coverage
 
+      - name: Run performance tests
+        run: make -C build performance
+        if: ${{ matrix.perf-test }}
+
       - name: Send code coverage to coveralls.io
         run: make -C build coveralls
         if: ${{ matrix.coveralls }}

CMakeLists.txt

@@ -36,6 +36,14 @@ add_custom_target(luatest
   COMMENT "Run regression tests"
 )
 
+set(PERFORMANCE_TESTS_SUBDIR "test/performance")
+
+add_custom_target(performance
+  COMMAND PERF_MODE_ON=true ${LUATEST} -v -c ${PERFORMANCE_TESTS_SUBDIR}
+  WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+  COMMENT "Run performance tests"
+)
+
 add_custom_target(coverage
   COMMAND ${LUACOV} ${PROJECT_SOURCE_DIR} && grep -A999 '^Summary' ${CODE_COVERAGE_REPORT}
   DEPENDS ${CODE_COVERAGE_STATS}

crud/stats/metrics_registry.lua

@@ -28,6 +28,7 @@ local metric_name = {
 
 local LATENCY_QUANTILE = 0.99
 
+-- Increasing tolerance threshold affects performance.
 local DEFAULT_QUANTILES = {
     [LATENCY_QUANTILE] = 1e-3,
 }