[NRG] Reminder: NRG Meeting: Christine Bassem @ Mon Apr 14, 2014 11am - 12pm (NRG Calendar)

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Sun Apr 13 11:00:14 EDT 2014


This is a reminder for:

Title: NRG Meeting: Christine Bassem
Title: Network-aware VM Allocation for Predictable Performance
Presenter: Christine Bassem

Abstract:
The talk will cover the following two papers:

(1) - Towards predictable datacenter networks - SIGCOMM 2011
The shared nature of the network in today's multi-tenant datacenters  
implies that network performance for tenants can vary significantly. This  
applies to both production datacenters and cloud environments. Network  
performance variability hurts application performance which makes tenant  
costs unpredictable and causes provider revenue loss. Motivated by these  
factors, this paper makes the case for extending the tenant-provider  
interface to explicitly account for the network. We argue this can be  
achieved by providing tenants with a virtual network connecting their  
compute instances. To this effect, the key contribution of this paper is  
the design of virtual network abstractions that capture the trade-off  
between the performance guarantees offered to tenants, their costs and the  
provider revenue.

To illustrate the feasibility of virtual networks, we develop Oktopus, a  
system that implements the proposed abstractions. Using realistic,  
large-scale simulations and an Oktopus deployment on a 25-node two-tier  
testbed, we demonstrate that the use of virtual networks yields  
significantly better and more predictable tenant performance. Further,  
using a simple pricing model, we find that the our abstractions can reduce  
tenant costs by up to 74% while maintaining provider revenue neutrality.


(2) - The only constant is change: incorporating time-varying network  
reservations in data centers - SIGCOMM 2012
In multi-tenant datacenters, jobs of different tenants compete for the  
shared datacenter network and can suffer poor performance and high cost  
from varying, unpredictable network performance. Recently, several virtual  
network abstractions have been proposed to provide explicit APIs for tenant  
jobs to specify and reserve virtual clusters (VC) with both explicit VMs  
and required network bandwidth between the VMs. However, all of the  
existing proposals reserve a fixed bandwidth throughout the entire  
execution of a job.

In the paper, we first profile the traffic patterns of several popular  
cloud applications, and find that they generate substantial traffic during  
only 30%-60% of the entire execution, suggesting existing simple VC models  
waste precious networking resources. We then propose a fine-grained virtual  
network abstraction, Time-Interleaved Virtual Clusters (TIVC), that models  
the time-varying nature of the networking requirement of cloud  
applications. To demonstrate the effectiveness of TIVC, we develop Proteus,  
a system that implements the new abstraction. Using large-scale simulations  
of cloud application workloads and prototype implementation running actual  
cloud applications, we show the new abstraction significantly increases the  
utilization of the entire datacenter and reduces the cost to the tenants,  
compared to previous fixed-bandwidth abstractions.

When: Mon Apr 14, 2014 11am - 12pm Eastern Time
Where: MCS 148
Calendar: NRG Calendar
Who:
     * Yuefeng Wang - creator

Event details:  
https://www.google.com/calendar/event?action=VIEW&eid=bWZqdnEzbjIxN2JvN2RrcGNvZDcyZmRmNGMgNTYwam42bnQ1aGo0b2YzcnNyaWNoZnB0aW9AZw

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