Android | 关于 OOM 的那些事

val manager = getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager
manager.memoryClass

val manager = getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager
manager.largeMemoryClass

adb shell
cat /system/build.prop

dalvik.vm.heapstartsize=5m	#单个应用程序分配的初始内存
dalvik.vm.heapgrowthlimit=48m	#单个应用程序最大内存限制，超过将被Kill，
dalvik.vm.heapsize=256m  #所有情况下（包括设置android:largeHeap="true"的情形）的最大堆内存值，超过直接oom。

oid Heap::ThrowOutOfMemoryError(Thread* self, size_t byte_count, AllocatorType allocator_type) {
  // If we're in a stack overflow, do not create a new exception. It would require running the
  // constructor, which will of course still be in a stack overflow.
  if (self->IsHandlingStackOverflow()) {
    self->SetException(
        Runtime::Current()->GetPreAllocatedOutOfMemoryErrorWhenHandlingStackOverflow());
    return;
  }
  //....
  std::ostringstream oss;
  size_t total_bytes_free = GetFreeMemory();
  oss << "Failed to allocate a " << byte_count << " byte allocation with " << total_bytes_free
      << " free bytes and " << PrettySize(GetFreeMemoryUntilOOME()) << " until OOM,"
      << " target footprint " << target_footprint_.load(std::memory_order_relaxed)
      << ", growth limit "
      << growth_limit_;
  
  self->ThrowOutOfMemoryError(oss.str().c_str());
}

fun testOOM() {
    val manager = requireContext().getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager
    Timber.e("app maxMemory ${manager.memoryClass} Mb")
    Timber.e("large app maxMemory ${manager.largeMemoryClass} Mb")
    Timber.e("current app maxMemory ${Runtime.getRuntime().maxMemory() / 1024 / 1024} Mb")
    var count = 0
    val list = mutableListOf<ByteArray>()
    while (true) {
        Timber.e("count $count    total ${count * 20}")
        list.add(ByteArray(1024 * 1024 * 20))
        count++
    }
}

 E  app maxMemory 256 Mb
 E  large app maxMemory 512 Mb
 E  current app maxMemory 256 Mb
 E  count 0    total 0
 E  count 1    total 20
 E  count 2    total 40
 E  count 3    total 60
 E  count 4    total 80
 E  count 5    total 100
 E  count 6    total 120
 E  count 7    total 140
 E  count 8    total 160
 E  count 9    total 180
 E  count 10    total 200
 E  count 11    total 220
 E  count 12    total 240
java.lang.OutOfMemoryError: Failed to allocate a 20971536 byte allocation with 12386992 free bytes and 11MB until OOM, target footprint 268435456, growth limit 268435456
......

app maxMemory 256 Mb                      
large app maxMemory 512 Mb
current app maxMemory 512 Mb
E  count 0    total 0
E  count 1    total 20
E  count 2    total 40
E  count 3    total 60
E  count 4    total 80
E  count 5    total 100
E  count 6    total 120
E  count 7    total 140
E  count 8    total 160
E  count 9    total 180
E  count 10    total 200
E  count 11    total 220
E  count 12    total 240
E  count 13    total 260
E  count 14    total 280
E  count 15    total 300
E  count 16    total 320
E  count 17    total 340
E  count 18    total 360
E  count 19    total 380
E  count 20    total 400
E  count 21    total 420
E  count 22    total 440
E  count 23    total 460
E  count 24    total 480
E  count 25    total 500
FATAL EXCEPTION: main
Process: com.dzl.duanzil, PID: 31874
java.lang.OutOfMemoryError: Failed to allocate a 20971536 byte allocation with 8127816 free bytes and 7937KB until OOM, target footprint 536870912, growth limit 536870912

void Thread::CreateNativeThread(JNIEnv* env, jobject java_peer, size_t stack_size, bool is_daemon) {
  //........
  env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 0);
  {
    std::string msg(child_jni_env_ext.get() == nullptr ?
        StringPrintf("Could not allocate JNI Env: %s", error_msg.c_str()) :
        StringPrintf("pthread_create (%s stack) failed: %s",
                                 PrettySize(stack_size).c_str(), strerror(pthread_create_result)));
    ScopedObjectAccess soa(env);
    soa.Self()->ThrowOutOfMemoryError(msg.c_str());
  }
}

E/art: ashmem_create_region failed for 'indirect ref table': Too many open files java.lang.OutOfMemoryError:Could not allocate JNI Env at java.lang.Thread.nativeCreate(Native Method) at java.lang.Thread.start(Thread.java:730)

E OOM_TEST: create thread : 1104
W com.demo: Throwing OutOfMemoryError "Could not allocate JNI Env: Failed anonymous mmap(0x0, 8192, 0x3, 0x22, -1, 0): Operation not permitted. See process maps in the log." (VmSize 2865432 kB)
E InputEventSender: Exception dispatching finished signal.
E MessageQueue-JNI: Exception in MessageQueue callback: handleReceiveCallback
MessageQueue-JNI: java.lang.OutOfMemoryError: Could not allocate JNI Env: Failed anonymous mmap(0x0, 8192, 0x3, 0x22, -1, 0): Operation not permitted. See process maps in the log.
E MessageQueue-JNI:      at java.lang.Thread.nativeCreate(Native Method)
E MessageQueue-JNI:      at java.lang.Thread.start(Thread.java:887)

E AndroidRuntime: FATAL EXCEPTION: main
E AndroidRuntime: Process: com.demo, PID: 3533
E AndroidRuntime: java.lang.OutOfMemoryError: Could not allocate JNI Env: Failed anonymous mmap(0x0, 8192, 0x3, 0x22, -1, 0): Operation not permitted. See process maps in the log.
E AndroidRuntime:        at java.lang.Thread.nativeCreate(Native Method)
E AndroidRuntime:        at java.lang.Thread.start(Thread.java:887)

static size_t FixStackSize(size_t stack_size) {
  if (stack_size == 0) {
    stack_size = Runtime::Current()->GetDefaultStackSize();
  }
  stack_size += 1 * MB;
  if (kMemoryToolIsAvailable) {
    stack_size = std::max(2 * MB, stack_size);
  }  if (stack_size < PTHREAD_STACK_MIN) {
    stack_size = PTHREAD_STACK_MIN;
  }
  if (Runtime::Current()->ExplicitStackOverflowChecks()) {
    stack_size += GetStackOverflowReservedBytes(kRuntimeISA);
  } else {
    stack_size += Thread::kStackOverflowImplicitCheckSize +
        GetStackOverflowReservedBytes(kRuntimeISA);
  }
  stack_size = RoundUp(stack_size, kPageSize);
  return stack_size;
}

W/libc: pthread_create failed: couldn't allocate 1073152-bytes mapped space: Out of memory
W/tch.crowdsourc: Throwing OutOfMemoryError with VmSize  4191668 kB "pthread_create (1040KB stack) failed: Try again"
java.lang.OutOfMemoryError: pthread_create (1040KB stack) failed: Try again
        at java.lang.Thread.nativeCreate(Native Method)
        at java.lang.Thread.start(Thread.java:753)

fun testOOM() {
    var count = 0
    while (true) {
        val thread = Thread(Runnable {
            Thread.sleep(1000000000)
        })
        thread.start()
        count++
        Timber.e("current thread count $count")
    }
}

pthread_create failed: couldn't allocate 1085440-bytes mapped space: Out of memory
Throwing OutOfMemoryError "pthread_create (1040KB stack) failed: Try again" (VmSize 4192344 kB)

FATAL EXCEPTION: main
Process: com.dzl.duanzil, PID: 18085
java.lang.OutOfMemoryError: pthread_create (1040KB stack) failed: Try again
    at java.lang.Thread.nativeCreate(Native Method)