Thermal management in datacenters
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Thermal Management in Datacenters. Ayan Banerjee. Thermal Management using task placement. Tasks: Requires a certain number of servers (cores) for a specified amount of time. Each task has certain power consumption on each server of a particular node.

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Thermal Management in Datacenters

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Thermal management in datacenters

Thermal Management in Datacenters

Ayan Banerjee


Thermal management using task placement

Thermal Management using task placement

  • Tasks: Requires a certain number of servers (cores) for a specified amount of time.

  • Each task has certain power consumption on each server of a particular node.

  • Assign cores to the tasks based on certain objective.

  • Remember task placement and not task scheduling


Goals of this project

Goals of this project

  • Build CFD model of a real Datacenter

  • Perform thermal profiling

  • Test the performance of different task placement algorithms on this model

  • Simulate Cross Interference minimization algorithm for multiple task scenario arriving at different time intervals

  • Test the optimality of the solutions for different objectives


Cfd models

CFD Models

  • Flovent 6.1


Difficulties faced with flovent

Difficulties faced with Flovent

  • Simplified Heterogeneous datacenter takes 18 hrs to run the base case

  • Cannot set parameters dynamically

  • According to findings HVAC outlet temperature varies with its inlet temperature

  • Cannot simulate that in Flovent so there will be difficulties in simulating algorithms that try to reduce total energy consumption


Observations

Observations

  • Energy aware task placement algorithms must take into account the behavior of the Cooling System

  • Basis: AC works harder when the Hot isle temperature in the datacenter increases


Observations1

Observations

  • For the objective of minimizing total energy

    • We have to consider the working of the AC in the objective function

    • We have to consider a heterogeneous Datacenter

    • We have to design algorithms that will allow different jobs to work on the same server


Experiment

Experiment

  • Took the simplified CFD model of the Datacenter

  • There were 50 chassis. The design was for homogeneous environment.

  • Built a heterogeneous environment with 20 chassis equipped with dual core processor and the rest 30 chassis with quad core.

  • Total number of cores = 1300.

  • Dual core – idle = 1728 W, Busy = 3260 W

    Quad core – idle = 2420 W, Busy = 6020 W

  • Two applications T1 and T2

    • T1 required 288 servers for a time period of 3 units starting from unit 0 to unit 3

    • T2 required 672 cores for a time period of 3 units starting form unit 1 to unit 4

  • Find the solution for the cross interference minimization algorithm for the objective of minimizing Maximum Temperature and minimizing total energy.


Task placement

Task Placement

Minimizing Maximum Temperature

Maximum Inlet Temperature = 24.6016 degrees

Total Power = 162525 W


Task placement1

Task Placement

Minimizing Total Energy

Task 2

Task 1

Total Energy Consumption = 576592 J

MaxTin = 26.3093 C 29.0858 C 27.7871 C


Goals revisited

Goals Revisited

  • CFD Model of Datacenter not yet ready

    • We have information on Saguaro Racks but little information on other racks

    • Certain physical parameters need to be recorded

  • Power Profiling not done as a result of incomplete CFD Model

  • Simulation Environment for multiple task arriving at different times ready

  • Optimality of the cross interference minimization algorithm tested

  • Apart form the cited goals a lot of observations useful for future work are made


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