1 / 27

Analyzing the Energy Efficiency of a Database Server

Analyzing the Energy Efficiency of a Database Server . Hanskamal Patel SE 521. Article. Analyzing the Energy Efficiency of a Database Server Dimitris Tsirogiannis – University of Toronto Stavros Harizopoulos – HP Labs Mehul A. Shah – HP Labs. Introduction .

snow
Télécharger la présentation

Analyzing the Energy Efficiency of a Database Server

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Analyzing the Energy Efficiency of a Database Server Hanskamal Patel SE 521

  2. Article • Analyzing the Energy Efficiency of a Database Server • DimitrisTsirogiannis– University of Toronto • Stavros Harizopoulos– HP Labs • Mehul A. Shah – HP Labs

  3. Introduction • Evaluating database system in terms of performance is measured in task per second or queries per second. • Similarly, energy-efficiency is determined by the measure of completed task per energy/Queries per Joule. • Improving performance is hardware/platform oriented or workload-management oriented. • Exploring ways to improve energy efficiency of a single-machine database server.

  4. Test Machine Configuration

  5. Power Breakdown • About half of the peak power is idle system • Two CPU’s • Fixed RAM Power • Board components • SDD and HDD Minimal Power • Left side of the chart is active power consumption • CPU is dominant component • SSD and HDD draw similar power

  6. CPU Usage vs. Power

  7. What affects energy efficiency? • EE = Work/Energy = Performance/Power • Several options affect power-use and potentially affect energy efficiency • CPU cycles to fetch data from disk • Scans, record access, compressions, sorting, and joining • Energy efficiency can be improved but it may sacrifice performance

  8. Energy efficiency vs. Performance • Experimented with five different overhead kernels • Parallel performing, cache-conscious hash join, sorting, alphasort and parallel merging • High performance storage engine that supports column and row oriented database scans. • PostgreSQL and System-X DBMS

  9. Performance vs. Energy

  10. Performance vs. Energy

  11. Assembling data-management architectures • Scale-up • Shared memory and shared disk • Choosing the balance of components and power down unneeded resources • Scale-out • Share nothing • Single node configurations connected by scaled network • Choose energy efficient components for one node and performance optimized for another

  12. Power Profiles of Hardware Components • RAM • RAM is responsible for 20% of the power consumption and stays the same throughout • Only way to vary power usage by memory is to physically remove the modules from the board

  13. Power Profiles of Hardware Components • Disks • Both HDD and SSD in the configuration • Supports active and idle stages, consuming different amount of power – 15% in the active stage • Test Configuration • Raid-0 configuration for both HDD and HDD • Reading 100GB file @ block size of 128KB

  14. Power Consumption of Disks

  15. Power Profiles of Hardware Components • CPU • The two CPU’s are responsible for the 85% of power increase in the system while active • Interested in understanding: • How CPU power is affected by database operations and the efficacy of hardware and software power management • Developed a set of micro-benchmarks that performs three classes of database operations: hashing, sorting, and scans.

  16. Micro-benchmarks • Custom Join Kernel • Hash join algorithm for computing join of two relations in parallel. • Sort Kernel • Two in-memory parallel sorting algorithm • Scan kernel • Scan uncompressed rows in memory • Scan compressed column on disk

  17. Analyzing Power Consumption

  18. Memory bus utilization

  19. Hashjoin Operator

  20. Sort Operator

  21. Scan Operator

  22. Energy vs. Performance • Parameters that have greatest impact on energy • Algorithm/plan selection • Intra-operator parallelism • Inter-query parallelism

  23. Algorithm/Plan selection • Access Methods • Join Algorithms • Complex Queries and Join Ordering

  24. Intra-operator and Inter-query Parallelism • Intra-operator parallelism • Parallel hash join • Parallel Sorts • Inter-query parallelism • Executing multiple queries at the same time

  25. Implications for Database Computing • One size fits all • Collection of nodes, where each node is optimized for specific task • High parallelism, low-frequency, small cache, and simple design CPU • Solid state drives • Shared nothing, everything, or in-between • Shared nothing and shared disk • Controlling peak power

  26. Conclusion • CPU power usage by different operators can vary by up to 60% • The best performing system was the most energy efficient • Future investigations: • Improving resources across unutilized nodes to save power • Alternative energy efficient hardware for lower fixed-power cost

  27. Questions?

More Related