Abstract:
Sizing an infrastructure configuration optimized for a workload mix includes: a) instructing a virtualized-aware testing service (VATS) test controller to perform a test of an initial infrastructure configuration in a virtualized environment, in which the test provides at least one test result; b) determining whether the at least one test result satisfies a predetermined requirement as identified in the workload mix; c) modifying at least one parameter of the initial infrastructure configuration to create a modified infrastructure configuration in response to the at least one test result failing to satisfy the predetermined requirement; d) instructing the VATS test controller to perform another test on the modified infrastructure configuration to generate another at least one test result; e) repeating steps b)-d) until a final infrastructure configuration that causes the another at least one test result to satisfy the predetermined requirement is identified; and f) outputting the final infrastructure configuration.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    The present application has the same Assignee and shares some common subject matter with U.S. patent application Ser. No. TBD (Attorney Docket No. 200802159-1), filed on even date herewith, by Johannes Kirschnick et al., U.S. patent application Ser. No. TBD (Attorney Docket No. 200801868-1), filed on even date herewith, by Jerome Rolia et al., and U.S. patent application Ser. No. 12/252,395 (Attorney Docket No. 200702143-2), filed on Oct. 16, 2008, by Jerome Rolia et al., which claims the benefit of priority to U.S. Provisional Patent Application No. 61/001,483, filed on Oct. 31, 2007. The disclosures of the above-identified applications for patent are hereby incorporated by reference in their entireties. 
     
    
     BACKGROUND 
       [0002]    There has been substantial growth in the purchase of information technology as a service from internal and external service providers and this trend appears to be increasing rapidly. This growth is enabled by the trend towards cloud computing, in which, services run on shared virtualized resource pools that are accessible via Intranets or the Internet. As this cloud computing paradigm matures, there is also an increasing trend for businesses to exploit the paradigm to support business critical services such as sales and delivery, and supply chain management. Those services will have performance requirements and are likely to place significant loads on cloud infrastructures. 
         [0003]    With the increasing loads currently being placed on cloud computing infrastructures, it is becoming increasingly important to create systems configured to accurately model the workloads imposed upon the systems contained in the cloud computing infrastructures. One modeling method utilizes benchmarks to impose a synthetic workload on the cloud computing infrastructures being tested. The use of benchmarks facilitates the management of the enterprise application system in areas such as capacity planning and service level performance. 
         [0004]    A typical business process, for instance, ordering, may in turn invoke a number of discreet business objects in order to complete the business process. In addition, a given business object may be characterized by a particular sequence of interdependent requests which are exchanged between entities in the enterprise application system. In other words, the sequence of interdependent requests should be performed correctly in order to correctly implement the business process. Thus, a benchmark for modeling the enterprise application system should accurately reflect the correct sequence and volume of interdependent requests. Otherwise, an incorrect sequence of interdependent requests may cause an error condition that does not accurately model the demands placed upon the enterprise application system. 
         [0005]    However, conventional stress testing of enterprise application systems is based upon a small number of pre-existing benchmarks which typically utilize a small subset of business objects. As a result, it is difficult to generate a synthetic workload that accurately models the actual request patterns expected at the enterprise application system. Alternatively, creating a customized benchmark that is representative of a given enterprise is typically too time consuming and expensive for many users. 
         [0006]    In addition, conventional stress testing procedures generally require users to have a high level of skill to be able to understand how to size and tune the enterprise application systems to accurately model the actual request patterns. Moreover, manually studying the test results and selecting which change to make to an enterprise application system, to enact that change, and to generate new measurement results and repeating that process until a suitable configuration is determined, is typically too time consuming and complicated for users to perform. 
         [0007]    It would thus be beneficial to be able to automatically size a system without suffering from all of the drawbacks and disadvantages of conventional sizing methods. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0008]    The embodiments of the invention will be described in detail in the following description with reference to the following figures. 
           [0009]      FIG. 1A  illustrates a block diagram of an infrastructure configuration sizing system, according to an embodiment of the invention; 
           [0010]      FIG. 1B  illustrates a more detailed block diagram of the optimizer depicted in  FIG. 1A , according to an embodiment of the invention; 
           [0011]      FIG. 2  illustrates a flow diagram of a method of implementing the infrastructure configuration sizing system, and more particularly, the optimizer depicted in  FIGS. 1A and 1B , to size an infrastructure configuration optimized for a workload mix, according to an embodiment of the invention; and 
           [0012]      FIG. 3  illustrates a block diagram of a computing apparatus configured to implement the method depicted in  FIG. 2  according to an embodiment of the invention. 
       
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
       [0013]    For simplicity and illustrative purposes, the principles of the embodiments are described by referring mainly to examples thereof. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. It will be apparent however, to one of ordinary skill in the art, that the embodiments may be practiced without limitation to these specific details. In some instances, well known methods and structures have not been described in detail so as not to unnecessarily obscure the embodiments. 
         [0014]    Disclosed herein is an optimizer for sizing an infrastructure configuration optimized for a workload mix and a method for implementing the optimizer. The optimizer is configured to receive the workload mix of a particular customer, which includes one or more benchmarks that are relevant to the particular customer&#39;s requirements, which is described in the Ser. No. 12/252,395 application for patent. The optimizer is also configured to operate with a virtualized-aware testing service (VATS) test controller, which is described in the TBD (Attorney Docket No. 200802159-1) application for patent, to identify results associated with various infrastructure configurations based upon the benchmark(s). In addition, the optimizer is configured to identify an infrastructure configuration that is able to perform a workload while satisfying predetermined requirements as defined in the workload mix. As discussed below, the optimizer is configured to perform a plurality of processes in an iterative manner to identify the infrastructure configuration. 
         [0015]    The optimizer and method disclosed herein are highly customizable to customers&#39; particular needs because the optimizer and method disclosed herein are able to identify optimized infrastructure configurations for the workload mixes of each particular customer&#39;s needs. In one regard, therefore, the optimizer and method disclosed herein enables the infrastructure configuration that remains below a predetermined threshold resource utilization requirement while performing the workloads defined in the workload mixes to be identified. Thus, by way of particular example, the predetermined threshold resource utilization requirement may be set to be a minimum resource usage requirement and the optimizer and method disclosed herein may identify the infrastructure configuration that requires the least amount of cost to perform the individual workload requirements of the customers. 
         [0016]    With reference first to  FIG. 1A , there is shown a block diagram of an infrastructure configuration sizing system  100 , according to an example. In one regard, the methods disclosed herein below may be implemented in the system  100  as discussed in greater detail herein below. It should be understood that the system  100  may include additional elements and that some of the elements described herein may be removed and/or modified without departing from a scope of the system  100 . 
         [0017]    The infrastructure configuration sizing system  100  is depicted as including a virtualized-aware automated testing service (VATS) test controller  102 , an input source  110 , a service lifecycle (SLiM) tool  120 , cloud controller  122 , a service under test (SUT) monitor  126 , a load source  130 , a data store  140 , an output device  150 , and an optimizer  160 . Also shown in  FIG. 1A  is a shared virtualized resource pool  124 , which comprises a cloud computing environment where services run on shared virtualized resource pools that are accessible via Intranets or the Internet. The use of the cloud computing environment makes it possible for the VATS test controller  102  to rapidly change resource levels and infrastructure configurations and topologies and thus rapidly vary the parameters of the infrastructure configurations to be tested. 
         [0018]    Many of the components depicted in the infrastructure configuration sizing system  100  are described in the TBD (Attorney Docket No. 200802159-1) application for patent. The disclosure contained in that application for patent thus provides a more detailed discussion with respect to at least some of the components depicted in the infrastructure configuration sizing system  100  and the various manners in which the components interact with each other. 
         [0019]    Each of the VATS test controller  102  and the optimizer  160  comprises a hardware device, such as, a circuit or multiple circuits arranged on a board, or, alternatively, each of the VATS test controller  102  and the optimizer  160  comprises software comprising code stored, for instance, in a volatile or non-volatile memory, such as DRAM, EEPROM, MRAM, flash memory, floppy disk, a CD-ROM, a DVD-ROM, or other optical or magnetic media, and the like. In the second example, each of the VATS test controller  102  and the optimizer  160  comprises a software module stored in a memory. In a further alternative, each of the VATS test controller  102  and the optimizer  160  comprises a combination of hardware and software modules. In addition, although the VATS test controller  102  and the optimizer  160  have been depicted as forming separate components, the VATS test controller  102  and the optimizer  160  may be formed as a single unit, such that the resulting configuration has the same functional characteristics, as discussed in greater detail herein below. 
         [0020]    In any regard, the VATS test controller  102  and the optimizer  160  are generally configured to perform a number of functions in the system  100 . As discussed in greater detail herein below, the VATS test controller  102  comprises code or is otherwise configured to automatically execute tests, manipulate a virtualized infrastructure (for instance, a cloud computing environment) to perform the tests under multiple configurations and generate and collect performance information of resources in executing the tests under the multiple configurations. 
         [0021]    The optimizer  160  comprises code or is otherwise configured to interact with the VATS test controller  102  to cause the VATS test controller  102  to perform the tests, and to collect test results  152  from the VATS test controller  102 . In addition, the optimizer  160  comprises code or is otherwise configured to analyze the test results  152  and to modify parameters of the infrastructure configuration until an infrastructure configuration that is optimally sized for a workload mix  112  is determined. The workload mix  112  may be defined as a description of how a client is expected to use different system functions in an infrastructure configured to perform a desired workload as well as the client&#39;s expectations in performing the workload. By way of particular example, the optimizer  160  determines an infrastructure configuration that satisfies a predetermined requirement, such as, a response time goal at a required throughput level, while performing the workload, as identified in the workload mix  112 , and interacts with the VATS test controller  102  to perform a test on the infrastructure configuration. In another example, the predetermined requirement comprises a requirement that the amount of resources utilized in performing the workload remain within a predetermined resource utilization requirement or that the utilized amount of resources be minimized while still meeting the other predetermined requirements of, for instance, response time and throughput goals. 
         [0022]    A more detailed block diagram illustration of the optimizer  160  is depicted in  FIG. 1B , which shows the optimizer  160  as including an input module  162 , an initial configuration module  164 , a VATS interaction module  166 , a test comparison module  168 , a parameter modification module  170 , and an output module  172 . The modules  162 - 172  may comprise software modules, hardware modules, or a combination thereof, as discussed above with respect to the optimizer  160 . The optimizer  160  is also depicted as being in communication with a data store  174 . 
         [0023]    As shown in  FIG. 1B , the input module  162  receives input from an input source  110 . According to an example, the input source  110  comprises a computer program stored on a computer readable storage medium configured to define a workload mix  112  and to input the defined workload mix  112  into the optimizer  160 . The workload mix  112  may generally be defined as being based upon a ratio of one or more predefined benchmarks, which correspond to a desired workload to be performed by resources in an infrastructure, and as including one or more predetermined requirements in performing the desired workload. The predetermined requirements include, for instance, desired throughput and response time requirements, resource utilization thresholds, minimum resource utilization requirements, etc., which may be client-defined. Thus, by way of particular example, the workload mix  112  may indicate that certain functions, such as, various business objects are to be implemented, as well as the sequence in which the certain functions are to be performed, and the VATS test controller  102  may identify an initial infrastructure configuration configured to perform those functions in the correct sequence. 
         [0024]    The ratio of the one or more pre-defined benchmarks is described in greater detail in the Ser. No. 12/252,395 application for patent. As discussed in that application for patent, the predefined benchmark(s) are benchmark(s) configured to accurately reflect the sequences and dependencies of interdependent requests that are required to be performed correctly in order to correctly implement a client&#39;s business process. Generally speaking, therefore, the predefined benchmark(s) define workloads, including the order in which the workloads are to be performed, that are substantially similar to the workloads that a client is likely to require from the resources in an infrastructure. 
         [0025]    The optimizer  160  may store the workload mix  112 , which includes the predefined benchmark(s) and the predetermined requirements, in the data store  174 , which comprises any device capable of storage of information or any combination of devices capable of storage of information, such as, a semiconductor device, a magnetic disk memory device, nonvolatile memory devices, such as, an EEPROM or CDROM, etc. The data store  174  may also comprise a fixed or removable data storage device. 
         [0026]    The initial configuration module  164  is configured to receive the workload mix  112  information from the input module  162  and to optionally communicate the predefined benchmark information to the VATS interaction module  166 . In addition, the initial configuration module  164  is configured to identify a plurality of initial infrastructure configuration parameters to be tested by the VATS test controller  102  based upon the predefined benchmark(s). For instance, the initial configuration module  164  identifies demand estimates for the predefined benchmark(s) and, and based upon the identified demand estimates, identifies that the initial infrastructure configuration should include a particular combination of parameters or resources that is anticipated to meet the demand estimates, such as a particular number or kind of application servers, particular memory sizes of the application servers, concurrency parameters that govern each application&#39;s concurrency management mechanisms (e.g., threads), a particular number of network switches, a particular allocation of network bandwidth, etc. 
         [0027]    Moreover, the initial configuration module  164  is configured to communicate the initial infrastructure configuration parameters to the VATS test controller  102  through the VATS interaction module  166  and to instruct the VATS test controller  102 . In this regard, the VATS interaction module  166  may comprise a hardware and/or software interface that enables communications between the optimizer  160  and the VATS test controller  102 . 
         [0028]    In response to receipt of the instructions from the optimizer  160 , the VATS test controller  102  is configured to initiate performance of a test on the initial infrastructure configuration in a virtualized environment. In this regard, the VATS test controller  102  may employ the initial infrastructure configuration as the test description discussed in the TBD (Attorney Docket No. 200802159-1) application for patent. In addition, although the initial configuration module  164  has been described herein as identifying the initial infrastructure configuration parameters, in other embodiments, the VATS test controller  102  may identify the initial infrastructure configuration parameters without departing from a scope of the optimizer  160 . 
         [0029]    The VATS test controller  102  is thus configured to be instantiated and deployed to perform a test on the initial infrastructure configuration. Various manners in which the VATS test controller  102  interacts with the SLiM tool  120  and the load source  130  are described in the TBD (Attorney Docket No. 200802159-1) application for patent. That disclosure is incorporated by reference in its entirety herein. Through performance of the test on the initial infrastructure configuration of resources contained in the shared virtualized resource pool  124 , as discussed in that application for patent, the VATS test controller  102  generates one or more test results  152 . The one or more test results  152  may include at least one of, for instance, a number of users supported, throughputs, response times, resource utilization levels, etc., associated with the initial infrastructure configuration. 
         [0030]    The VATS test controller  102  communicates the test result(s)  152  to the optimizer  160 . More particularly, for instance, the VATS test controller  102  communicates the test result(s)  152  to the optimizer  160  through the VATS interaction module  166 . In addition, the test comparison module  168  compares the test result(s)  152  with one or more predetermined requirements, which may have been defined in the workload mix  112  received from the input source  110 . The predetermined requirement(s) may comprise, for instance, a throughput requirement, a response time requirement, a number of users supported requirement, etc., the workload to be performed, a minimum resource utilization level requirement, a threshold resource utilization level requirement, etc. By way of particular example, the test comparison module  168  is configured to determine whether the throughput associated with the initial infrastructure configuration is able to perform the workload while satisfying a predetermined throughput requirement as set forth in the workload mix  112  received from the input source  110 . 
         [0031]    In the event that the test comparison module  168  determines that the test result(s)  152  meets the predetermined requirement(s), the test comparison module  168  may output the initial infrastructure configuration as a suitable configuration of an infrastructure that meets the workload mix  112 . In the event that the test comparison module  168  determines that one or more of the test results  152  fail to meet one or more of the predetermined requirements, the test comparison module  168  may communicate with the parameter modification module  170  to modify one or more parameters of the initial infrastructure configuration. Alternatively, the test comparison module  168  may communicate with the parameter modification module  170  to modify the one or more parameters even in instances where the test result(s)  152  meets the predetermined requirement(s) to, for instance, identify a more efficient infrastructure configuration that meets the predetermined requirement(s). 
         [0032]    In either event, the parameter modification module  170  is configured to determine which of the parameters of the initial infrastructure configuration, which include the number or kind of application servers employed, concurrency parameters that govern each application server&#39;s concurrency management mechanisms (e.g., threads), network bandwidth, CPU speed, cache size, memory size, etc., to modify. In one example, the parameter modification module  170  is configured to select one or more of the parameters to modify based upon a historical knowledge of how the parameters affect the infrastructure configuration. For instance, the number of application servers may be known from prior iterations of the VATS to have the greatest impact on the results of the infrastructure configuration, while the memory sizes are known to have a second highest impact. In another example, the parameter modification module  170  is configured to modify some or all of the parameters or to randomly select one or more of the parameters to modify. 
         [0033]    In any regard, the parameter modification module  170  is configured to communicate the modified infrastructure configuration having the modified one or more parameters to the VATS test controller  102  via the VATS interaction module  166 . In response, the VATS test controller  102  is configured to perform a test on the modified infrastructure configuration to generate another test result(s)  152 . In addition, the another test result(s)  152  are received through the VATS interaction module  166  and communicated to the test comparison module  168 , which again compares the another test result(s)  152  to the predetermined requirement(s) to determine whether the modified infrastructure configuration is associated with test result(s)  152  that satisfies the predetermined requirement(s). 
         [0034]    In one embodiment, the VATS interaction module  166 , the test comparison module  168 , and the parameter modification module  170  are configured to repeat the operations discussed above until the test comparison module  168  identifies a final infrastructure configuration that satisfies the predetermined requirement(s). In addition, the test comparison module  168  is configured to output the infrastructure configuration that satisfies the predetermined requirement(s) to an output device  150  through the output module  172 . The output device  150  may comprise, for instance, a network interface, a display monitor, a printer, etc., that enables the optimizer  160  to communicate the test results  152  to one or more users. 
         [0035]    In another embodiment, the predetermined requirement(s) further comprises a requirement that the amount of resources utilized in performing the workload remain below a predetermined threshold resource utilization level or that the utilized amount of resources be minimized. In this embodiment, the parameter modification module  170  is configured to modify at least one of the parameters of the infrastructure configuration to reduce at least one resource utilization of the infrastructure configuration to meet the predetermined requirement(s), while still meeting the other predetermined requirements of performing the workload and meeting the other requirements, such as, throughput, response time, etc. In one example, the parameter modification module  170  is configured to modify those parameters that are known to have a greater impact on the overall resource utilization, such as, power consumption, network bandwidth utilization, cooling power consumption, carbon emissions, etc., before modifying other parameters known to have a lower impact on the overall resource utilization. 
         [0036]    In another example, the parameter modification module  170  is configured to randomly modify the parameters during a number of iterations to determine which infrastructure configuration is associated with resource utilization levels that remain below the predetermined threshold resource utilization level or with the lowest resource utilization levels. As discussed in the TBD (Attorney Docket No. 200802159-1) application for patent, the VATS test controller  102  may cause multiple tests to be run in parallel to thus reduce the amount of time required in rigorously identifying the infrastructure configuration that is associated with the lowest resource utilization levels. 
         [0037]    An example of a method of implementing the infrastructure configuration sizing system  100 , and more particularly, the optimizer  160 , to size an infrastructure configuration optimized for a workload mix  112 , will now be described with respect to the following flow diagram of the method  200  depicted in  FIG. 2 . It should be apparent to those of ordinary skill in the art that the method  200  represents a generalized illustration and that other steps may be added or existing steps may be removed, modified or rearranged without departing from a scope of the method  200 . 
         [0038]    The description of the method  200  is made with reference to the infrastructure configuration sizing system  100  illustrated in  FIG. 1A  and the optimizer  160  illustrated in  FIG. 1B , and thus makes reference to the elements cited therein. It should, however, be understood that the method  200  is not limited to the elements set forth in the infrastructure configuration sizing system  100  and the optimizer  160 . Instead, it should be understood that the method  200  may be practiced by a system having a different configuration than that set forth in the infrastructure configuration sizing system  100  and the optimizer  160 . 
         [0039]    At step  202 , the input module  162  receives a workload mix  112  that is based upon a ratio of one or more predefined benchmarks from the input source  110 . At step  204 , the initial configuration module  164  optionally communicates the predefined benchmark information to the VATS test controller  102  via the VATS interaction module  166 . Step  204  is considered optional because the initial configuration module  164  may not communicate the predefined benchmark information to the VATS test controller  102  in instances where the initial configuration module  164  identifies the initial infrastructure configuration. 
         [0040]    At step  206 , an initial infrastructure configuration is identified and the VATS interaction module  166  instructs the VATS test controller  102  to perform a test on the initial infrastructure configuration in the virtualized environment to generate one or more test results  152 , as described in the TBD (Attorney Docket No. 200802159-1) application for patent. According to a first example, the initial configuration module  164  is configured to identify the initial infrastructure configuration from the predefined benchmark information, as discussed in greater detail herein above. In another example, the VATS test controller  102  is configured to identify the initial infrastructure configuration from the predefined benchmark information, as discussed in greater detail herein above. 
         [0041]    At step  208 , the optimizer  160  receives the test result(s)  152  from the VATS test controller  102 . In addition, at step  210 , the test comparison module  168  compares the test result(s)  152  with one or more predetermined requirements. More particularly, at step  210 , the test comparison module  168  determines whether the test result(s)  152  satisfies the predetermined requirement(s), for instance, as set forth in the workload mix  112  received at step  202 . By way of particular example, the predetermined requirement(s) comprises a response time requirement and the test comparison module  168  determines whether the response time as identified in the test result(s)  152  satisfies the response time requirement. As another example, the predetermined requirement(s) comprises a minimum resource utilization level requirement and the test comparison module  168  determines whether the resource utilization level of the initial infrastructure configuration satisfies the minimum resource utilization level requirement. In this example, a number of iterations of the following steps may be required prior to a determination of whether the minimum resource utilization level requirement has been satisfied may be made. 
         [0042]    In the event that the test result(s)  152  satisfies the predetermined requirement(s) at step  210 , the test comparison module  168  outputs the initial infrastructure configuration as a suitable configuration of an infrastructure that meets the workload mix  112 , as indicated at step  212 . As discussed above, the test comparison module  168  may output this information to an output device  150  through the output module  172 . 
         [0043]    If, however, one or more of the test results  152  fails to satisfy one or more of the predetermined requirements at step  210 , the test comparison module  168  communicates with the parameter modification module  170  to modify one or more of the infrastructure configuration parameters, and the parameter modification module  170  modifies one or more of the parameters, as indicated at step  214 . By way of example, if the predetermined requirement comprises a minimum resource utilization level requirement, the test comparison module  168  communicates with the parameter modification module  170  to modify one or more of the infrastructure configuration parameters in the event that the resource utilization level associated with the initial infrastructure configuration exceed the minimum resource utilization level requirement. 
         [0044]    In addition, the parameter modification module  170  is configured to select the one or more of the parameters to modify according to any of a number of various manners as discussed above. In another example, the parameter modification module  170  modifies some or all of the parameters by setting some or all of the parameters to their respective maximum values and by reducing each of the plurality of parameters, in turn, during subsequent iterations of steps  208 - 218 , until a final infrastructure configuration that causes the another at least one test result to satisfy the predetermined requirement and utilizes a minimized amount of resources is identified. 
         [0045]    In a further example, the parameter modification module  170  modifies a plurality of parameters by setting the plurality of parameters to have initial values and by variously increasing and decreasing the plurality of parameters to obtain a plurality of test results corresponding to the various modifications of the plurality of parameters to identify a plurality of interactions. In this example, the parameter modification module  170  develops a model of the interactions and selects the one or more of the plurality of parameters to modify prior to step  214  through implementation of the model of the interactions. 
         [0046]    At step  216 , the parameter modification module  170  communicates the modified infrastructure configuration having the modified one or more parameters to the VATS test controller  102  via the VATS interaction module  166 . In addition, at step  218 , the VATS interaction module  166  instructs the VATS test controller  102  to perform a test on the modified infrastructure configuration, for instance as discussed in the TBD (Attorney Docket No. 200802159-1) application for patent, to generate another one or more test results  152 . 
         [0047]    Steps  208 - 218  are repeated until a final infrastructure configuration that results in the test result(s)  152  satisfying the predetermined requirement(s) is identified at step  210 . Steps  208 - 218  may be performed for a plurality of modified infrastructure configurations in parallel or in series with respect to each other. In addition, the final infrastructure configuration may be outputted as indicated at step  212 , in which the final infrastructure configuration comprises an infrastructure configuration that is optimally sized for the workload mix  112 . In addition, or alternatively, the method  200  may be terminated for additional reasons. For instance, the method  200  may be terminated after steps  208 - 218  have been repeated for a predetermined number of iterations without resulting in an infrastructure configuration that satisfies the predetermined requirement(s). In this example, the predetermined number of iterations may be based upon a predefined quantity of resources or costs have been expended or after a predefined number of iterations are performed that indicates that an infrastructure configuration that satisfies the predetermined requirement(s) is unlikely to be identified. 
         [0048]    Through implementation of the method  200 , an infrastructure configuration composed of application servers, memories, network switches, bandwidth allocations, etc., configured to perform a workload configured to satisfy one or more predefined benchmarks while satisfying a predetermined requirement may automatically be identified. In addition, the infrastructure configuration may be optimally sized for the workload by minimizing the resource utilization level of the infrastructure configuration, while being configured to perform the workload. 
         [0049]    The operations set forth in the method  200  may be contained as utilities, programs, or subprograms, in any desired computer accessible medium. In addition, the method  200  may be embodied by computer programs, which may exist in a variety of forms both active and inactive. For example, they may exist as software program(s) comprised of program instructions in source code, object code, executable code or other formats. Any of the above may be embodied on a computer readable storage medium. 
         [0050]    Exemplary computer readable storage medium include conventional computer system RAM, ROM, EPROM, EEPROM, and magnetic or optical disks or tapes. Concrete examples of the foregoing include distribution of the programs on a CD ROM or via Internet download. It is therefore to be understood that any electronic device capable of executing the above-described functions may perform those functions enumerated above. 
         [0051]      FIG. 3  illustrates a block diagram of a computing apparatus  300  configured to implement or execute some or all of the steps defined in the method  200  depicted in  FIG. 2 , according to an example. In this respect, the computing apparatus  300  may be used as a platform for executing one or more of the functions described hereinabove with respect to the optimizer  160  depicted in  FIGS. 1A and 1B . 
         [0052]    The computing apparatus  300  includes a processor  302  that may implement or execute some or all of the steps described in the method  200 . Commands and data from the processor  302  are communicated over a communication bus  304 . The computing apparatus  300  also includes a main memory  306 , such as a random access memory (RAM), where the program code for the processor  302 , may be executed during runtime, and a secondary memory  308 . The secondary memory  308  includes, for example, one or more hard disk drives  310  and/or a removable storage drive  312 , representing a floppy diskette drive, a magnetic tape drive, a compact disk drive, etc., where a copy of the program code for the method  200  may be stored. 
         [0053]    The removable storage drive  312  reads from and/or writes to a removable storage unit  314  in a well-known manner. User input and output devices may include a keyboard  316 , a mouse  318 , and a display  320 . A display adaptor  322  may interface with the communication bus  304  and the display  320  and may receive display data from the processor  302  and convert the display data into display commands for the display  320 . In addition, the processor(s)  302  may communicate over a network, for instance, the Internet, LAN, etc., through a network adaptor  324 . 
         [0054]    It will be apparent to one of ordinary skill in the art that other known electronic components may be added or substituted in the computing apparatus  300 . It should also be apparent that one or more of the components depicted in  FIG. 3  may be optional (for instance, user input devices, secondary memory, etc.). 
         [0055]    What has been described and illustrated herein is a preferred embodiment of the invention along with some of its variations. The terms, descriptions and figures used herein are set forth by way of illustration only and are not meant as limitations. Those skilled in the art will recognize that many variations are possible within the scope of the invention, which is intended to be defined by the following claims—and their equivalents—in which all terms are meant in their broadest reasonable sense unless otherwise indicated.