[NRG] [WING] Reminder: NRG Meeting: Christine Bassem @ Mon Mar 24, 2014 11am - 12pm (NRG Calendar)

Larissa Spinelli lspinell at bu.edu
Wed Mar 19 14:43:39 EDT 2014

Just updating information about our next week NRG talk.




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

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.

On Wed, Mar 19, 2014 at 11:00 AM, Google Calendar <
calendar-notification at google.com> wrote:

>  more details >><https://www.google.com/calendar/event?action=VIEW&eid=c2g5ZjlxcHM4bDRhdmkwMmx1N3NwbDA5ajAgNTYwam42bnQ1aGo0b2YzcnNyaWNoZnB0aW9AZw>
> NRG Meeting: Christine Bassem
> *When*
> Mon Mar 24, 2014 11am - 12pm Eastern Time
> *Where*
> MCS-148, 111 Cummington Mall, Boston, MA 02215 (map<http://maps.google.com/maps?q=MCS-148,+111+Cummington+Mall,+Boston,+MA+02215&hl=en>
> )
> *Calendar*
> NRG Calendar
> *Who*
> *
> Yuefeng Wang - creator
> Invitation from Google Calendar <https://www.google.com/calendar/>
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