Download PDF by Tobias Ritzau: Memory Efficient Hard Real-Time Garbage Collection

By Tobias Ritzau

ISBN-10: 917373666X

ISBN-13: 9789173736664

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If they are equal, the write-barrier does nothing. This would improve the execution time of assignments like the one above, but slow down other assignments. While the special assignments should be very rare, it is better to do the incrementing first and get rid of the problem. If reference counting is to be used in a multi-threaded system, some synchronization has to be performed. Problems will arise if a thread is interrupted in the middle of an increment or decrement operation of a reference count while another thread is updating the same reference count.

If the mark stack is empty, objects from the copied program stack are pushed onto it. The number of transferred objects is limited by a constant. If the copied stack also becomes empty, the collector goes into its sweeping phase. Allocations in the sweeping phase are preceded by a sweep of a constant number of white objects. When all white objects have been swept, the collector goes back into its idle phase. Except for the write-barrier, all work in Yuasa’s collector is done while allocating new objects.

Because the memory is compacted and placed at one end of the heap, allocation of n bytes can be done by simply sliding a pointer n positions in the free memory region. An advantage of the technique is that the running time of the garbage collector is proportional to the number of live objects. Thus, a large heap size does not affect the running time of the collector, and the collector can be run less frequently. Appel [App87] has demonstrated that using a “standard” computer with a heap size seven times larger than the amount of live memory, a copying garbage collector is faster than stack allocation!

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Memory Efficient Hard Real-Time Garbage Collection (Linkoping studies in science and technology) by Tobias Ritzau

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