1 / 5

Performance - PowerPoint PPT Presentation

  • Uploaded on

Performance. Performance is about time and the software system’s ability to meet timing requirements. Performance. Event arrival p atterns: Periodic : events arrive predictably at regular time intervals. Stochastic : events arrive according to some probabilistic distribution.

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about ' Performance' - hateya

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

Performance is about time and the software system’s ability to meet timing requirements.


  • Event arrival patterns:

  • Periodic: events arrive predictably at regular time intervals.

  • Stochastic: events arrive according to some probabilistic distribution.

  • Sporadic: events arrive according to a pattern that is nether periodic nor stochastic.

  • Response measures:

  • Latency: the time between the event arrival and the system’s response.

  • Deadline: for complete processing

  • Throughput: number of transactions that the system can process in a unit time

  • Jitter: allowable variation in latency

  • Miss rate: the number of events that the system is not able to process

  • Response time:

  • Processing time: when the system is working to response by consuming resources

  • Blocked time: when the system is unable to response, because of resource contention

    • Contention for resources

    • Availability of resources

    • Dependency on other computation

Performance tactics1
Performance Tactics

  • Control Resource Demand by reducing the number of events processed

  • Manage sample rate: reduce the sampling frequency

  • Limit event response: process events only up to a set maximum rate

  • Prioritize events: impose a priority scheme that ranks all events according to their importance for services

  • Reduce overhead: remove intermediaries to improve latency (conflict with modifiability)

  • Bound execution times: place a limit on how much execution time is used to response to an event

  • Increase resource efficiency: improving the algorithms used in critical areas to decrese latency

Performance tactics2
Performance Tactics

  • Manage Resources

  • Increase resources: add additional hardware resources

  • Introduce concurrency: do parallel processing when possible and not extra overhead

  • Maintain multiple copies of computations: use multiple/replicated servers

  • Maintain multiple copies of data: use caching and data replication

  • Bound queue size: control the maximum number of queued arrivals and the resources used to process the arrivals. Need to deal with overflow.

  • Schedule resources: understand the characteristics of each resource’s use and choose the scheduling strategy that is compatible with it.