Rebalance isolate stress testing shards.

Cq-Include-Trybots: luci.dart.try:iso-stress-linux-x64-try,iso-stress-linux-arm64-try
Change-Id: Ie47b15116053870b04ad95eba0efb6f36d7a35cb
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/424341
Reviewed-by: Alexander Aprelev <[email protected]>

Author: rmacnak-google

runtime/tests/concurrency/generate_stress_test.dart

@@ -24,9 +24,11 @@ main(List<String> args) async {
 }
 
 Future<String> generateStressTest(List<String> testFiles) async {
-  testFiles = testFiles
-      .map((String file) => path.absolute(path.join(thisDirectory, file)))
-      .toList();
+  testFiles =
+      testFiles
+          .map((String file) => path.absolute(path.join(thisDirectory, file)))
+          .toList()
+        ..shuffle();
 
   final sb = StringBuffer();
   sb.writeln(r'''

runtime/tests/concurrency/run_stress_test_shards.dart

@@ -179,7 +179,7 @@ main(List<String> arguments) async {
       '--disable-dart-dev',
       '--no-inline-alloc',
       '--use-slow-path',
-      '--deoptimize-on-runtime-call-every=3',
+      '--deoptimize-on-runtime-call-every=300',
       'runtime/tests/concurrency/generated_stress_test.dart.jit.dill',
     ]),
     for (int i = 0; i < tsanShards; ++i)

tools/bots/test_matrix.json

@@ -3624,7 +3624,6 @@
     },
     {
       "builders": [
-        "iso-stress-linux",
         "iso-stress-linux-x64",
         "iso-stress-linux-arm64"
       ],
@@ -3633,52 +3632,25 @@
       },
       "steps": [
         {
-          "name": "Build Dart VM - JIT and AOT - gen_snapshot",
+          "name": "build dart (debug)",
           "script": "tools/build.py",
           "arguments": [
-            "--mode=debug,release",
-            "gen_snapshot"
-          ]
-        },
-        {
-          "name": "Build Dart VM - JIT and AOT - runtime/bin:dart, run_vm_tests",
-          "script": "tools/build.py",
-          "arguments": [
-            "--mode=debug,release",
-            "runtime/bin:dart",
-            "runtime/bin:run_vm_tests"
-          ]
-        },
-        {
-          "name": "Build Dart VM - JIT and AOT - runtime, dartaotruntime",
-          "script": "tools/build.py",
-          "arguments": [
-            "--mode=debug,release",
+            "--mode=debug",
             "runtime",
             "dartaotruntime"
           ]
         },
         {
-          "name": "Build Dart VM - JIT and AOT (Release TSAN) - gen_snapshot",
+          "name": "build dart (release)",
           "script": "tools/build.py",
           "arguments": [
             "--mode=release",
-            "--sanitizer=tsan",
-            "gen_snapshot"
-          ]
-        },
-        {
-          "name": "Build Dart VM - JIT and AOT (Release TSAN)- runtime/bin:dart, run_vm_tests",
-          "script": "tools/build.py",
-          "arguments": [
-            "--mode=release",
-            "--sanitizer=tsan",
-            "runtime/bin:dart",
-            "runtime/bin:run_vm_tests"
+            "runtime",
+            "dartaotruntime"
           ]
         },
         {
-          "name": "Build Dart VM - JIT and AOT (Release TSAN) - runtime, dartaotruntime",
+          "name": "build dart (release tsan)",
           "script": "tools/build.py",
           "arguments": [
             "--mode=release",
@@ -3729,7 +3701,7 @@
             "--arch=${arch}",
             "--copy-coredumps"
           ],
-          "shards": 10,
+          "shards": 4,
           "fileset": "vm"
         }
       ]