flaky vm/dart_2/isolates/fast_object_copy_test turned Timeout on dartk-linux-release-simarm64

[aam]

on https://ci.chromium.org/ui/p/dart/builders/ci.sandbox/vm-kernel-linux-release-simarm64/12186/overview

--- Command "vm_compile_to_kernel" (took 01.000433s):
DART_CONFIGURATION=ReleaseSIMARM64 /b/s/w/ir/pkg/vm/tool/gen_kernel --no-aot --platform=out/ReleaseSIMARM64/vm_platform_strong.dill -o /b/s/w/ir/out/ReleaseSIMARM64/generated_compilations/dartk-linux-release-simarm64/runtime_tests_vm_dart_2_isolates_fast_object_copy_test/out.dill /b/s/w/ir/runtime/tests/vm/dart_2/isolates/fast_object_copy_test.dart --packages=/b/s/w/ir/.packages -Ddart.vm.product=false

exit code:
0

--- Command "vm" (took 16:00.000441s):
DART_CONFIGURATION=ReleaseSIMARM64 out/ReleaseSIMARM64/dart --ignore-unrecognized-flags --packages=/b/s/w/ir/.packages /b/s/w/ir/out/ReleaseSIMARM64/generated_compilations/dartk-linux-release-simarm64/runtime_tests_vm_dart_2_isolates_fast_object_copy_test/out.dill

exit code:
null

diagnostics:
Process list including children: [19687]
Trying to capture stack trace for pid 19687
PID 19687 - process
TID 19687:
#0  0x00007f8861193ad3 pthread_cond_wait@@GLIBC_2.3.2
#1  0x0000564f28b29f68 dart::Monitor::WaitMicros(long)
#2  0x0000564f28fb6dca Dart_RunLoop
#3  0x0000564f288abe59 dart::bin::RunMainIsolate(char const*, char const*, dart::bin::CommandLineOptions*)
#4  0x0000564f288acbb7 dart::bin::main(int, char**)
#5  0x0000564f288ad989 main
#6  0x00007f8860a18bf7 __libc_start_main
#7  0x0000564f288a64e9 _start
TID 19688:
#0  0x00007f8860b18a47 epoll_wait
#1  0x0000564f288bc598 dart::bin::EventHandlerImplementation::Poll(unsigned long)
#2  0x0000564f289ee090 dart::bin::ThreadStart(void*)
#3  0x00007f886118d6db start_thread
#4  0x00007f8860b1871f __clone
TID 19689:
#0  0x00007f8861193ad3 pthread_cond_wait@@GLIBC_2.3.2
#1  0x0000564f28b29f68 dart::Monitor::WaitMicros(long)
#2  0x0000564f28bd9150 dart::BackgroundCompiler::Run()
#3  0x0000564f28bc66b8 dart::ThreadPool::WorkerLoop(dart::ThreadPool::Worker*)
#4  0x0000564f28bc6aec dart::ThreadPool::Worker::Main(unsigned long)
#5  0x0000564f28b29818 dart::ThreadStart(void*)
#6  0x00007f886118d6db start_thread
#7  0x00007f8860b1871f __clone
TID 19694:
#0  0x0000564f28ba6d31 dart::Simulator::DecodeLoadStore(dart::Instr*)
#1  0x0000564f28ba3523 dart::Simulator::InstructionDecode(dart::Instr*)
#2  0x0000564f28baa74b dart::Simulator::Execute()
#3  0x0000564f28baab04 dart::Simulator::Call(long, long, long, long, long, bool, bool)
#4  0x0000564f28a4ac2c dart::DartEntry::InvokeCode(dart::Code const&, unsigned long, dart::Array const&, dart::Array const&, dart::Thread*)
#5  0x0000564f28a4aa6d dart::DartEntry::InvokeFunction(dart::Function const&, dart::Array const&, dart::Array const&, unsigned long)
#6  0x0000564f28a4d06d dart::DartLibraryCalls::HandleMessage(dart::Object const&, dart::Instance const&)
#7  0x0000564f28a75611 dart::IsolateMessageHandler::HandleMessage(std::__2::unique_ptr<dart::Message, std::__2::default_delete<dart::Message> >)
#8  0x0000564f28aa001c dart::MessageHandler::HandleMessages(dart::MonitorLocker*, bool, bool)
#9  0x0000564f28aa073f dart::MessageHandler::TaskCallback()
#10 0x0000564f28bc66b8 dart::ThreadPool::WorkerLoop(dart::ThreadPool::Worker*)
#11 0x0000564f28bc6aec dart::ThreadPool::Worker::Main(unsigned long)
#12 0x0000564f28b29818 dart::ThreadStart(void*)
#13 0x00007f886118d6db start_thread
#14 0x00007f8860b1871f __clone



stdout:
testTransferrable
testTransferrable2
testTransferrable3
testTransferrable4
testTransferrable5
testExternalTypedData
testExternalTypedData2
testExternalTypedData3
testExternalTypedData4
testExternalTypedData5
testExternalTypedData6
testInternalTypedDataView
testInternalTypedDataView2
testInternalTypedDataView3
testInternalTypedDataView4
testExternalTypedDataView
testExternalTypedDataView2
testExternalTypedDataView3
testExternalTypedDataView4
testArray
testMapRehash
testMapRehash2
testMapRehash3
testSetRehash
testSetRehash2
testSetRehash3
testFastOnly
testSlowOnly

--- Re-run this test:
python3 tools/test.py -n dartk-linux-release-simarm64 vm/dart_2/isolates/fast_object_copy_test/0

[dcharkes]

This is toggling between timeout and flaky:

current results: https://dart-ci.firebaseapp.com/current_results/#/filter=vm/dart/isolates/fast_object_copy_test/2&showAll (1x simarm64 flaky, 1x simarm64 timeout)
history: https://dart-ci.firebaseapp.com/#showLatestFailures=false&test=vm/dart/isolates/fast_object_copy_test/2&configurations=dartk-weak-asserts-linux-release-simarm64
log: https://dart-ci.appspot.com/log/vm-kernel-nnbd-linux-release-simarm64/dartk-weak-asserts-linux-release-simarm64/380/vm/dart/isolates/fast_object_copy_test/2
log 2: https://dart-ci.appspot.com/log/vm-kernel-nnbd-linux-release-simarm64/dartk-weak-asserts-linux-release-simarm64/380/vm/dart/isolates/fast_object_copy_test/3

[askeksa-google]

Turned Timeout again in https://dart-ci.appspot.com/log/vm-kernel-linux-release-simarm64/dartk-linux-release-simarm64/13497/vm/dart_2/isolates/fast_object_copy_test/4

[whesse]

On simarm64, isolates/fast_object_copy_test times out after 15 minutes, but isolates/fast_object_copy2_test passes in 5 seconds.

Because it is very consistently timing out on the jit simarm64 platforms, I think it should be skipped on those platforms. There have been occasional timeouts on simarm, but not consistently.

Even on simarm, the fast_object_copy_test is taking 11 minutes for each variation, and the fast_object_copy2_test is only taking 3 seconds. So skipping the test on simarm would also save a lot of builder time, even though it is not timing out.

Skip CL: https://dart-review.googlesource.com/c/sdk/+/237320

I suspect the long runtime is due to a few loops that send 20 MB typed data between isolates, and they each run 10 times. Maybe 10 times is not needed.
expensive loop

[dcharkes]

Thanks @whesse !