====== 4.3.7 Performance ======
[[dido:public:ra:1.4_req:2_nonfunc| Return to Non-Functional Requirements]]

===== About =====
[[dido:public:ra:xapend:xapend.a_glossary:p:performance]] is the ability of a system to accomplish the required functionality at or under the required specification limits. The limits are generally provided relative to time (i.e., so-many transactions per second, so-many updates per millisecond, so-many recorded entries per second, etc.) The specifications can also include accuracy, precision, precision or even efficiency of other dependent systems as requirements. The following are some examples of [[dido:public:ra:xapend:xapend.a_glossary:p:performancespec|performance specifications]]:

  * Time for a data-entry window to appear 
  * Number of units produced in a given amount of time
  * Time to react to a given event
  * Amount of energy required to perform an activity
  * The amount of computing resources required (i.e., [[dido:public:ra:xapend:xapend.a_glossary:c:cpu]], [[dido:public:ra:xapend:xapend.a_glossary:r:computermemory]], [[dido:public:ra:xapend:xapend.a_glossary:r:rom]], [[dido:public:ra:xapend:xapend.a_glossary:s:storagedevice]], [[dido:public:ra:xapend:xapend.a_glossary:b:bandwidth]], etc)
  * Time to process a computational task such as compression-decompression, [[dido:public:ra:xapend:xapend.a_glossary:e:encryption|encryption]]-[[dido:public:ra:xapend:xapend.a_glossary:d:decryption|decryption]], generate a [[dido:public:ra:xapend:xapend.a_glossary:u:unique_identifier|Unique ID (UID)]], serialize-deserialize, calculate an area, calculate a new trajectory, etc.
  * Time to process a storage task such as store records, index the records, retrieve records, etc.
  * Time to access memory or cache such as direct memory access(DMA), the hit ratio
  * Time to transfer data between components of a computer such as from memory to [[dido:public:ra:xapend:xapend.a_glossary:c:cpu]], from CPU to graphics card, etc

Performance can also be viewed from the following perspectives:
  * [[dido:public:ra:1.4_req:2_nonfunc:40_performance:01_platform]]
  * [[dido:public:ra:1.4_req:2_nonfunc:40_performance:02_application]]
  * [[dido:public:ra:1.4_req:2_nonfunc:40_performance:04_nework]]

===== DIDO Specifics =====
[[dido:public:ra:1.4_req:2_nonfunc:40_performance | Return to Top]]

  : <wrap hi><color red> To be added/expanded in future revisions of the DIDO RA </color></wrap>


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