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In the simplest case, all tasks are placed in the bag before the workers begin Then each task continues until the bag is empty, at which point the workers terminate Another approach is to use a queue to implement the task bag and arrange for the master or a worker to check for the desired termination condition When it is detected, a poison pill, a special task that tells the workers to terminate, is created The poison pill must be placed in the bag in such a way that it will be picked up on the next round of work Depending on how the set of shared tasks are managed, it may be necessary to create one poison pill for each remaining worker to ensure that all workers receive the termination condition Problems for which the set of tasks is not known initially produce unique challenges This occurs, for example, when workers can add tasks as well as consume them (such as in applications of the Divide and Conquer pattern) In this case, it is not necessarily true that when a worker finishes a task and finds the task bag empty that there is no more work to do another still active worker could generate a new task One must therefore ensure that the task bag is empty and all workers are finished Further, in systems based on asynchronous message passing, it must be determined that there are no messages in transit that could, on their arrival, result in the creation of a new task There are many known algorithms that solve this problem For example, suppose the tasks are conceptually organized into a tree, where the root is the master task, and the children of a task are the tasks it generates When all of the children of a task have terminated, the parent task can terminate When all the children of the master task have terminated, the computation has terminated Algorithms for termination detection are described in [BT89, Mat87,DS80].

For our last look at attribute access special methods we will return to an example we rst saw in 6 In that chapter we created an Image class whose width, height, and background color are xed when an Image is created (although they are changed if an image is loaded) We provided access to them using read-only properties For example, we had:

This is easy to code but could become tedious if there are a lot of read-only properties Here is a different solution that handles all the Image class s read-only properties in a single method:

def __getattr__(self, name): if name == "colors": return set(self__colors) classname = self__class____name__ if name in frozenset({"background", "width", "height"}): return self__dict__["_{classname}__{name}"format( **locals())] raise AttributeError("'{classname}' object has no " "attribute '{name}'"format(**locals()))

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There are several variations on this pattern Because of the simple way it implements dynamic load balancing, this pattern is very popular, especially in embarrassingly parallel problems (as described in

When you sort strings, the first letter is examined and sorted, then the second letter, and then the third, and so on This causes our date data to get out of whack After 1/1/2007, the next number in the alphanumeric sort is 1/10/2007 This makes for an ugly result set To get around this problem now, you must convert the StringDate column during your select operation We won t go into the details of the query engine, but suffice it to say, the conversion of a string into a date adds overhead to the select query Paraphrasing a saying from a wise, uh, man, Overhead leads to higher CPU utilization, higher CPU utilization leads to poor performance, poor performance leads to suffering Again, had we used the correct data type, we could have avoided the problem of needing to convert the string and avoided the eventual suffering

If we attempt to access an object s attribute and the attribute is not found, Python will call the __getattr__() method (providing it is implemented, and that we have not reimplemented __getattribute__()), with the name of the attribute as a parameter Implementations of __getattr__() must raise an AttributeError exception if they do not handle the given attribute For example, if we have the statement imagecolors, Python will look for a colors attribute and having failed to nd it, will then call Image__getattr__(image, "colors") In this case the __getattr__() method handles a "colors" attribute name and returns a copy of the set of colors that the image is using The other attributes are immutable, so they are safe to return directly to the caller We could have written separate elif statements for each one like this:

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