OutofMemoryException Mac OS

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Definition

The exception that is thrown when there is not enough memory to continue the execution of a program.

OutOfMemoryError usually means that you’re doing something wrong, either holding onto objects too long, or trying to process too much data at a time. Sometimes, it indicates a problem that’s out of your control, such as a third-party library that caches strings, or an application server that doesn’t clean up after deploys. Now since we were running with 2g driver memory, we have a nice 2.4gb heap dump created. To analyze what is there in the Java Heap, I used a tool called Memory Analyzer which is an Eclipse plugin. Now we need to run Eclipse on a JVM which is having more than 2g memory to analyze a 2g heap dump. Tagged: duplicati, mono, mono-complete, out of memory, OutOfMemoryException. Leave a Comment If you install duplicati on OMV for arm (raspbian), you can receive Out or memory errors. An OutOfMemoryException exception has two major causes: You are attempting to expand a StringBuilder object beyond the length defined by its StringBuilder.MaxCapacity property. The common language runtime cannot allocate enough contiguous memory to successfully perform an operation.

Inheritance

OutOfMemoryException

Inheritance

OutOfMemoryException

Derived

Attributes

Remarks

OutOfMemoryException uses the HRESULT COR_E_OUTOFMEMORY, which has the value 0x8007000E.

For a list of initial property values for an instance of OutOfMemoryException, see the OutOfMemoryException constructors.

Note

The value of the inherited Data property is always null.

An OutOfMemoryException exception has two major causes:

You are attempting to expand a StringBuilder object beyond the length defined by its StringBuilder.MaxCapacity property.
The common language runtime cannot allocate enough contiguous memory to successfully perform an operation. This exception can be thrown by any property assignment or method call that requires a memory allocation. For more information on the cause of the OutOfMemoryException exception, see the blog post 'Out of Memory' Does Not Refer to Physical Memory.
This type of OutOfMemoryException exception represents a catastrophic failure. If you choose to handle the exception, you should include a catch block that calls the Environment.FailFast method to terminate your app and add an entry to the system event log, as the following example does.

Some of the conditions under which the exception is thrown and the actions you can take to eliminate it include the following:

You are calling the StringBuilder.Insert method.

You are attempting to increase the length of a StringBuilder object beyond the size specified by its StringBuilder.MaxCapacity property. The following example illustrates the OutOfMemoryException exception thrown by a call to the StringBuilder.Insert(Int32, String, Int32) method when the example tries to insert a string that would cause the object's Length property to exceed its maximum capacity.

You can do either of the following to address the error:

Replace the call to the StringBuilder.StringBuilder(Int32, Int32) constructor with a call any other StringBuilder constructor overload. The maximum capacity of your StringBuilder object will be set to its default value, which is Int32.MaxValue.
Call the StringBuilder.StringBuilder(Int32, Int32) constructor with a maxCapacity value that is large enough to accommodate any expansions to the StringBuilder object.

Your app runs as a 32-bit process.

32-bit processes can allocate a maximum of 2GB of virtual user-mode memory on 32-bit systems, and 4GB of virtual user-mode memory on 64-bit systems. This can make it more difficult for the common language runtime to allocate sufficient contiguous memory when a large allocation is needed. In contrast, 64-bit processes can allocate up to 8TB of virtual memory. To address this exception, recompile your app to target a 64-bit platform. For information on targeting specific platforms in Visual Studio, see How to: Configure Projects to Target Platforms.

Your app is leaking unmanaged resources

Although the garbage collector is able to free memory allocated to managed types, it does not manage memory allocated to unmanaged resources such as operating system handles (including handles to files, memory-mapped files, pipes, registry keys, and wait handles) and memory blocks allocated directly by Windows API calls or by calls to memory allocation functions such as malloc. Types that consume unmanaged resources implement the IDisposable interface.

If you are consuming a type that uses unmanaged resources, you should be sure to call its IDisposable.Dispose method when you have finished using it. (Some types also implement a Close method that is identical in function to a Dispose method.) For more information, see the Using Objects That Implement IDisposable topic.

If you have created a type that uses unmanaged resources, make sure that you have implemented the Dispose pattern and, if necessary, supplied a finalizer. For more information, see Implementing a Dispose method and Object.Finalize.

You are attempting to create a large array in a 64-bit process

By default, the common language runtime in .NET Framework does not allow single objects whose size exceeds 2GB. To override this default, you can use the <gcAllowVeryLargeObjects> configuration file setting to enable arrays whose total size exceeds 2 GB. On .NET Core, support for arrays of greater than 2 GB is enabled by default.

You are working with very large sets of data (such as arrays, collections, or database data sets) in memory.

When data structures or data sets that reside in memory become so large that the common language runtime is unable to allocate enough contiguous memory for them, an OutOfMemoryException exception results.

To prevent the OutOfMemoryException exceptions, you must modify your application so that less data is resident in memory, or the data is divided into segments that require smaller memory allocations. For example:

If you are retrieving all of the data from a database and then filtering it in your app to minimize trips to the server, you should modify your queries to return only the subset of data that your app needs. When working with large tables, multiple queries are almost always more efficient than retrieving all of the data in a single table and then manipulating it.
If you are executing queries that users create dynamically, you should ensure that the number of records returned by the query is limited.
If you are using large arrays or other collection objects whose size results in an OutOfMemoryException exception, you should modify your application to work the data in subsets rather than to work with it all at once.

The following example gets a array that consists of 200 million floating-point values and then calculates their mean. The output from the example shows that, because the example stores the entire array in memory before it calculates the mean, an OutOfMemoryException is thrown.

The following example eliminates the OutOfMemoryException exception by processing the incoming data without storing the entire data set in memory, serializing the data to a file if necessary to permit further processing (these lines are commented out in the example, since in this case they produce a file whose size is greater than 1GB), and returning the calculated mean and the number of cases to the calling routine.

You are repeatedly concatenating large strings.

Because strings are immutable, each string concatenation operation creates a new string. The impact for small strings, or for a small number of concatenation operations, is negligible. But for large strings or a very large number of concatenation operations, string concatenation can lead to a large number of memory allocations and memory fragmentation, poor performance, and possibly OutOfMemoryException exceptions.

When concatenating large strings or performing a large number of concatenation operations, you should use the StringBuilder class instead of the String class. When you have finished manipulating the string, convert the StringBuilder instance to a string by calling the StringBuilder.ToString method.

You pin a large number of objects in memory.