For example this trivial testPerformance takes over 2 minutes at 100% CPU:
class MyTests: XCTestCase {
func testPerformance() {
measure {
let _ = 1 + 1
}
}
}
The problem seems to be that constructing a XCSymbolicationRecord when reporting the test result is very slow in my setup. I'm not sure why this is ... generally working with my project in Xcode is fast. For example I can step thought project code in debugger without any big delays.
My project does include a big Rust library... maybe that's causing the problem? Is there anything I can do to make performance tests usable for my project?
Here's the stack whenever when I pause running the tests:
Thread 1 Queue : com.apple.main-thread (serial)
#0 0x00007fff68ae86a2 in __open ()
#1 0x0000000102ca2a34 in CSCppFileMemory::CSCppFileMemory(char const*, TRange<Pointer64>, unsigned int) ()
#2 0x0000000102ca01cb in new_partial_file_memory(char const*, unsigned long long, unsigned int, unsigned long long (CSCppFileMemory*) block_pointer) ()
#3 0x0000000102ca14eb in iterate_symbol_owners_from_archive(char const*, unsigned long long, unsigned int, CSCppArchitecture const&, char const*, bool, void (CSCppSymbolOwner*) block_pointer) ()
#4 0x0000000102ca04ef in iterate_symbol_owners_from_memory(CSCppMemory*, char const*, unsigned int, unsigned long long, unsigned int, CSCppArchitecture const&, char const*, bool, void (CSCppSymbolOwner*) block_pointer) ()
#5 0x0000000102ca0d46 in iterate_symbol_owners_from_path(char const*, bool, unsigned int, CSCppArchitecture const&, bool, void (CSCppSymbolOwner*) block_pointer) ()
#6 0x0000000102c907bf in CSSymbolicatorCreateWithPathArchitectureFlagsAndNotification ()
#7 0x0000000102c89133 in void extract_debug_maps_from_header<SizeAndEndianness<Pointer64, LittleEndian> >(TExtendedMachOHeader<SizeAndEndianness<Pointer64, LittleEndian> >&, TRawSymbolOwnerData<SizeAndEndianness<Pointer64, LittleEndian>::SIZE>&, TNList<SizeAndEndianness<Pointer64, LittleEndian> > const*, unsigned int, TRange<SizeAndEndianness<Pointer64, LittleEndian>::SIZE>) ()
#8 0x0000000102cc3be0 in TRawSymbolOwnerData<SizeAndEndianness<Pointer64, LittleEndian>::SIZE>* create_traw_symbol_owner_data_arch_specific<SizeAndEndianness<Pointer64, LittleEndian> >(CSCppSymbolOwner*, CSCppDsymData*) ()
#9 0x0000000102c7e69a in CSCppSymbolOwnerData* create_symbol_owner_data_arch_specific<SizeAndEndianness<Pointer64, LittleEndian> >(CSCppSymbolOwner*, CSCppDsymData*) ()
#10 0x0000000102c7e16d in create_symbol_owner_data2(CSCppSymbolOwner*, CSCppDsymData*) ()
#11 0x0000000102c7dd2c in CSCppSymbolOwnerCache::create_symbol_owner_data(CSCppSymbolOwner*, CSCppDsymData*) ()
#12 0x0000000102c7d6af in CSCppSymbolOwnerCache::data_for_symbol_owner(CSCppSymbolOwner*) ()
#13 0x0000000102c7d656 in CSCppSymbolOwner::data() ()
#14 0x0000000102c83ff3 in CSSymbolicatorGetSymbolWithAddressAtTime ()
#15 0x0000000102a769e1 in +[XCSymbolicationRecord symbolicationRecordForAddress:] ()
#16 0x0000000102a2798b in -[XCTestCase _symbolicationRecordForTestCodeInAddressStack:] ()
#17 0x0000000102a293ac in -[XCTestCase reportMetric:reportFailures:] ()
#18 0x0000000102a2b9db in -[XCTestCase measureMetrics:automaticallyStartMeasuring:forBlock:] ()
#19 0x0000000102a25a9b in -[XCTestCase measureBlock:] ()
#20 0x0000000105002c77 in BikeServiceTests.testPerformance() at /Users/jessegrosjean/Documents/github/Bike/clients/bike.swift/Common Tests/BikeServiceTests.swift:29
...