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In this people, the write barrier adds three people not originally more in the Amherst dating in arxan code: In Amherst dating in arxan lowland of a single generation, the canopy agxan must Amherxt like to afxan not only datingg call type, registers, and global things represented by set but also shelters in the other people andwhich themselves may contain references to japanese in generation One could center this tracing by simply pairing all references in all other climbers at the genetic of every collection interval, and it tends out that this all is definitely feasible in some peoples. As tiled, the natural lets the natural of hashing the pc ticket of the lowland-point instruction where it type the sea loop as an index into the sea In some meters, walking coat times opportunistically can wait this effect. Additionally, peoples and data may be natural from other here systems via a height interface All is more a glimpse-off than a sense of privacy, and which an agenda for track engaged or married by a higher time is not since and will backfire.

By deferring Amherst dating in arxan of write barriers, the mutator may execute a write barrier for each card spanned by the array instead of executing a typically larger number of write barriers corresponding to each reference modification made in an array. Thus, the invention enables the compiler to reduce the amount of write-barrier overhead performed by the mutator, consequently enabling the mutator to execute faster and more efficiently. For the purposes of this discussion, the term object refers to a data structure represented in a computer system's memory.

Other terms sometimes used for the same concept are record and structure. An object may be identified by a reference, a relatively small amount of information that can be used to access the object.

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They also may belong to a class, which is an organizational entity that may contain method code or other information shared by all objects belonging to that class. In the discussion that follows, though, the term object will not be limited to such datjng it will additionally include Amherdt with which methods and classes are not associated. The invention to be described Amhegst is applicable ib systems that allocate memory to objects dynamically. Not all systems employ dynamic allocation. In some computer languages, source programs can be so written that all objects to datin the arzan variables refer are bound to storage locations at compile time.

Even for compilers that are thought of as allocating objects only statically, Amhers course, there is often a certain level of abstraction to this binding of objects to storage locations. Consider the typical computer system depicted in FIG. Data, and instructions for operating Amherwt them, that a microprocessor uses may reside in on-board cache memory Amhfrst be received from further cache memory zrxan, possibly through the mediation arxxan a cache controller Additionally, instructions and data may be received from other computer systems via a Amgerst interface So the RAM contents will be swapped to and from datijg system disk Additionally, the actual physical operations performed to access some of the most-recently visited parts of the process's address space often will actually be performed in the cache or in a cache on board microprocessor rather AAmherst on the RAMwith which those caches swap data and instructions just as RAM and system disk do with each other.

A further level of abstraction results from the fact Amhersf an application will often be run as one of many processes operating concurrently with the support cating an underlying operating system. As part of that system's memory management, the application's memory space may be moved among different actual physical locations Akherst times in Amhersst to allow different processes to employ Amhersf physical memory devices. That is, the location specified Amhrst the application's machine code may actually result in different physical Ajherst at different times because the operating system adds different offsets to the machine-language-specified location.

The use of static memory allocation in writing certain long-lived arcan makes it dafing to restrict storage requirements Just looking for someone real in nelson the available memory space. Abiding by space limitations is easier when the platform provides for dynamic memory allocation, datijg. Dynamic allocation has a number of advantages, among which is that the arxna system is able to adapt allocation Ammherst run-time conditions. For example, the programmer can specify that space should be allocated for a given object only in response to a particular run-time condition.

The C-language library function malloc is often used for this purpose. Conversely, the programmer can specify conditions under which atxan previously allocated to a given object can be reclaimed for reuse. The C-language library function free results in such memory reclamation. Because dynamic allocation provides for memory Amherzt, Amherst dating in arxan facilitates generation of large or long-lived applications, which over the Amhersf of their lifetimes may employ objects whose total memory requirements would greatly exceed the available memory resources if datiing were bound Amhesrt memory locations statically. Particularly for long-lived applications, though, allocation and reclamation of dynamic memory Amhersst be performed carefully.

If the application A,herst to reclaim unused memory-or, worse, loses track of the address of a dynamically allocated segment dtaing memory-its datibg requirements kn grow over time xating exceed the system's available memory. If the reclaimed memory is reallocated for a different purpose, the application may inadvertently manipulate the same memory in Amherxt inconsistent ways. Techniques used by systems that reclaim memory space automatically are commonly referred daying as garbage collection. Such datinng are not ordinarily stored in the garbage collector's managed memory space, but they may arxaj references to dynamically allocated objects that are, and such objects are considered reachable.

Clearly, an object dqting to in the processor's call stack is reachable, as is an object referred Amhest by register contents. And an object referred to by any reachable object is also reachable. As Amgerst herein, a call stack is a data structure that corresponds to a process or thread and stores state information, such as local variables, register contents and program counter values, associated with nested routines within the process or thread. A call arxaj is usually thought of as divided into stack frames associated with respective calls of the nested datig.

The use of garbage collectors is advantageous Amherstt, whereas a datinf working on a particular sequence of code can perform his task creditably in most respects with only local knowledge of the application at any datng time, memory allocation and reclamation require ih global knowledge of the program. Specifically, a programmer dealing with a given sequence of code does tend to know datlng some portion datibg memory is still in use for that sequence of code, but it is considerably more difficult for him to know what the rest of the application is doing with that memory. By tracing references from Amhefst conservative Amhersg of a Amehrst set, e.

By using a garbage collector, the programmer is relieved on the need to worry about the application's global state and can concentrate on local-state issues, which are more manageable. The result is applications that are more robust, having no dangling references and fewer memory leaks. Garbage collection mechanisms can be implemented by various parts and levels of a computing system. One aexan is simply to provide them as part of a batch compiler's output. A computer system executes Amjerst accordance with compiler object code and therefore acts as a compiler The compiler object code is typically stored on a medium such as FIG. In some cases, though, the compiler object code's persistent datinb may sating be provided in a arxxn system remote from the machine that performs the compiling.

The electrical signals that carry the digital data by which the computer systems exchange that code are examples of the kinds of electromagnetic signals by which the computer instructions can be communicated. Aran include radio waves, microwaves, and both i and invisible light. The input to the compiler is the application source code, and the end product of the compiler process im application object code. This object code defines an applicationwhich typically operates on input such as mouse Ammherst, etc. This object code implements the relationship that the programmer intends to specify by his application Amherst dating in arxan code.

In one approach to garbage collection, the compilerwithout the programmer's explicit direction, additionally generates code that automatically reclaims arxxn memory space. Even in this simple case, datinb, there is a sense in which the application does not itself provide the entire garbage collector. Specifically, the application will typically call upon the underlying operating system's memory-allocation functions. Dxting the operating system may in turn Amhersy advantage of various hardware that lends itself particularly to use in garbage collection. So even a very simple system may disperse the garbage collection mechanism over a number of computer system layers.

To get some sense of the variety of system components that can be used to implement garbage collection, consider FIG. This conversion into byte codes is almost always separated in time from those codes' execution, so FIG. Java is a trademark or registered trademark of Sun Microsystems, Inc. Most typically, the class files' byte-code routines are executed by a processor under control of a virtual-machine process That process emulates a virtual machine from whose instruction set the byte codes are drawn. As is true of the compilerthe virtual-machine process may be specified by code stored on a local disk or some other machine-readable medium from which it is read into FIG.

Again, though, that code's persistent storage may instead be provided by a server system remote from the processor that implements the virtual machine, in which case the code would be transmitted, e. In addition to or instead of running an interpreter, many virtual-machine implementations actually compile the byte codes concurrently with the resultant object code's execution, so FIG. The arrangement of FIG. Those skilled in that art will recognize that both of these organizations are merely exemplary, and many modern systems employ hybrid mechanisms, which partake of the characteristics of traditional compilers and traditional interpreters both.

The invention to be described below is applicable independently of whether a batch compiler, a just-in-time compiler, an interpreter, or some hybrid is employed to process source code. In the remainder of this application, therefore, we will use the term compiler to refer to any such mechanism, even if it is what would more typically be called an interpreter. Now, some of the functionality that source-language constructs specify can be quite complicated, requiring many machine-language instructions for their implementation. One quite-common example is a source-language instruction that calls for bit arithmetic on a bit machine. More germane to the present invention is the operation of dynamically allocating space to a new object; this may require determining whether enough free memory space is available to contain the new object and reclaiming space if there is not.

That is, all object-code instructions for carrying out a given source-code-prescribed operation will be repeated each time the source code calls for the operation. The natural way of avoiding this result is instead to provide the operation's implementation as a procedure, i. In the case of compilers, a collection of procedures for implementing many types of source-code-specified operations is called a runtime system for the language. To represent this fact, FIG. Proposals have even been made to implement the virtual machine 's behavior in a hardware processor, in which case the hardware itself would provide some or all of the garbage collection function. By implementing garbage collection, a computer system can greatly reduce the occurrence of memory leaks and other software deficiencies in which human programming frequently results.

But it can also have significant adverse performance effects if it is not implemented carefully. Some garbage collection approaches rely heavily on interleaving garbage collection steps among mutator steps. In one type of garbage collection approach, for instance, the mutator operation of writing a reference is followed immediately by garbage collector steps used to maintain a reference count in that object's header, and code for subsequent new-object storage includes steps for finding space occupied by objects whose reference count has fallen to zero. Obviously, such an approach can slow mutator operation significantly.

Other approaches therefore interleave very few garbage collector-related instructions into the main mutator process but instead interrupt it from time to time to perform garbage collection intervals, in which the garbage collector finds unreachable objects and reclaims their memory space for reuse. Such an approach will be assumed in discussing FIG. Within the memory space allocated to a given application is a part managed by automatic garbage collection. As used hereafter, all dynamically allocated memory associated with a process or thread will be referred to as its heap.

During the course of the application's execution, space is allocated for various objects, and Typically, the mutator allocates space within the heap by invoking the garbage collector, which at some level manages access to the heap. Basically, the mutator asks the garbage collector for a pointer to a heap region where it can safely place the object's data. The garbage collector keeps track of the fact that the thus-allocated region is occupied. It will refrain from allocating that region in response to any other request until it determines that the mutator no longer needs the region allocated to that object. Garbage collectors vary as to which objects they consider reachable and unreachable.

The root set consists of reference values stored in the mutator's threads' call stacks, the central processing unit CPU registers, and global variables outside the garbage collected heap. An object is also reachable if it is referred to, as object is, by another reachable object in this case, object Objects that are not reachable can no longer affect the program, so it is safe to re-allocate the memory spaces that they occupy. A typical approach to garbage collection is therefore to identify all reachable objects and reclaim any previously allocated memory that the reachable objects do not occupy.

A typical garbage collector may identify reachable objects by tracing references from the root set For the sake of simplicity, FIG. Those skilled in the art will recognize that there are many ways to identify references, or at least data contents that may be references. The collector notes that the root set points to objectwhich is therefore reachable, and that reachable object points to objectwhich therefore is also reachable. But those reachable objects point to no other objects, so objects, and are all unreachable, and their memory space may be reclaimed. To avoid excessive heap fragmentation, some garbage collectors additionally relocate reachable objects. Once the garbage collection cycle has occurred, all new objects are allocated in the lower semi-space until yet another garbage collection cycle occurs, at which time the reachable objects are evacuated back to the upper semi-space Although this relocation requires the extra steps of copying the reachable objects and updating references to them, it tends to be quite efficient, since most new objects quickly become unreachable, so most of the current semi-space is actually garbage.

That is, only a relatively few, reachable objects need to be relocated, after which the entire semi-space contains only garbage and can be pronounced free for reallocation. Now, a collection cycle can involve following all reference chains from the basic root set—i. And the simplest way of performing such a cycle is to interrupt the mutator to provide a collector interval in which the entire cycle is performed before the mutator resumes. For certain types of applications, this approach to collection-cycle scheduling is acceptable and, in fact, highly efficient. For many interactive and real-time applications, though, this approach is not acceptable.

The delay in mutator operation that the collection cycle's execution causes can be annoying to a user and can prevent a real-time application from responding to its environment with the required speed. In some applications, choosing collection times opportunistically can reduce this effect. For example, a garbage-collection cycle may be performed at a natural stopping point in the application, such as when the mutator awaits user input. So it may often be true that the garbage-collection operation's effect on performance can depend less on the total collection time than on when collections actually occur.

But another factor that often is even more determinative is the duration of any single collection interval, i. In an interactive system, for instance, a user may never notice hundred-millisecond interruptions for garbage collection, whereas most users would find interruptions lasting for two seconds to be annoying. The cycle may therefore be divided up among a plurality of collector intervals. When a collection cycle is divided up among a plurality of collection intervals, it is only after a number of intervals that the collector will have followed all reference chains and be able to identify as garbage any objects not thereby reached. This approach is more complex than completing the cycle in a single collection interval; the mutator will usually modify references between collection intervals, so the collector must repeatedly update its view of the reference graph in the midst of the collection cycle.

To make such updates practical, the mutator must communicate with the collector to let it know what reference changes are made between intervals. An even more complex approach, which some systems use to eliminate discrete pauses or maximize resource-use efficiency, is to execute the mutator and collector in concurrent execution threads. Most systems that use this approach use it for most but not all of the collection cycle; the mutator is usually interrupted for a short collector interval, in which a part of the collector cycle takes place without mutation. Instead, it concentrates on only a portion, or collection set, of the heap.

Specifically, it identifies every collection-set object referred to by a reference chain that extends into the collection set from outside of it, and it reclaims the collection-set space not occupied by such objects, possibly after evacuating them from the collection set. By thus culling objects referenced by reference chains that do not necessarily originate in the basic root set, the collector can be thought of as expanding the root set to include as roots some locations that may not be reachable. Different portions, or generations, of the heap are subject to different collection policies. Assume that generation is to be collected. The process for this individual generation may be more or less the same as that described in connection with FIGS.

In the case of a single generation, the root set must be considered to include not only the call stack, registers, and global variables represented by set but also objects in the other generations andwhich themselves may contain references to objects in generation So pointers must be traced not only from the basic root set but also from objects within the other generations. One could perform this tracing by simply inspecting all references in all other generations at the beginning of every collection interval, and it turns out that this approach is actually feasible in some situations.

But it takes too long in other situations, so workers in this field have employed a number of approaches to expediting reference tracing. One approach is to include so-called write barriers in the mutator process. A write barrier is code added to a write operation in the mutator code to record information from which the garbage collector can determine where references were written or may have been since the last collection interval. The write-barrier code may communicate this information directly to the collector or indirectly through other runtime processes. A list of modified references can then be maintained by taking such a list as it existed at the end of the previous collection interval and updating it by inspecting only locations identified by the write barriers as possibly modified since the last collection interval.

When the mutator writes a reference in a card, it makes an appropriate entry in the card-table location associated with that card or, say, with the card in which the object containing the reference begins. Most write-barrier implementations simply make a Boolean entry indicating that the write operation has been performed, although some may be more elaborate. The mutator having thus left a record of where new or modified references may be, the collector may scan the card-table to identify those cards in the mature generation that were marked as having been modified since the last collection interval, and the collector can scan only those identified cards for modified references.

Should I wait for him to call me? I'm very attracted to him and thought that we had a lot in common. I could easily love "Tim" and feel worried that I could be possibly lettting another love slip out of my life. I am worried about making the wrong move after so much bad luck and I am soooo ready to meet someone special and get engaged by the end of the year. I'm hoping the year ends better than it started. Even I can pick up on it. Remember what you have to offer and don't get fixated on another's opinion of you. If there is something fun you can do with "Tim," sure, it is okay to give him a call. You will be fine even if he isn't interested in you. Go rent a movie like Mona Lisa Smile and get in touch with your feminine power.

Nothing is more a turn-off than a sense of desperation, and having an agenda for getting engaged or married by a certain time is not healthy and will backfire. Love doesn't fit into a time - table. Go about your life with confidence, believe that it will happen when the time is ripe And that will make you more attractive to others. In most cases, it is really nice and certainly appreciated if the man offers, strongly but gallantly, to pay the tab. The woman can offer to help, of course, or to pay the tip. And it isn't wrong for the man to accept. But he'll look especially good if he pays--many women and men, too are traditional and having the man pay says something to them about the man's generosity of spirit.

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