Srinidhi V Varadarajan

7895164, Feb 22, 2011

Mar 13, 2007

11/724082

Srinidhi Varadarajan - Blacksburg VA, US
Joseph Ruscio - Blacksburg VA, US
Michael Heffner - Blacksburg VA, US

Librato, Inc. - Santa Clara CA

G06F 17/00

707649, 707756

Approaches to efficiently creating a checkpoint of the process are described. In one approach, a method of performing a checkpoint operation on a process involves detecting a change in the contents of a memory page associated with the process. This change occurred after a preceding checkpoint operation. The method also involves modifying a data structure, at a location corresponding to the contents of that memory page.

8489921, Jul 16, 2013

Apr 7, 2009

12/420015

Srinidhi Varadarajan - Blacksburg VA, US
Joseph Ruscio - Blacksburg VA, US

Open Invention Network, LLC - Durham NC

G06F 11/00
G06F 11/1446

714 15, 714 16, 714 19, 714 20

A distributed system for creating a checkpoint for a plurality of processes running on the distributed system. The distributed system includes a plurality of compute nodes with an operating system executing on each compute node. A checkpoint library resides at the user level on each of the compute nodes, and the checkpoint library is transparent to the operating system residing on the same compute node and to the other compute nodes. Each checkpoint library uses a windowed messaging logging protocol for checkpointing of the distributed system. Processes participating in a distributed computation on the distributed system may be migrated from one compute node to another compute node in the distributed system by re-mapping of hardware addresses using the checkpoint library.

8631276, Jan 14, 2014

Sep 30, 2010

12/894877

Srinidhi Varadarajan - Blacksburg VA, US
Joseph F. Ruscio - Santa Clara CA, US

Open Invention Network, LLC - Durham NC

G06F 11/00

714 15

Log-Based Rollback Recovery for system failures. The system includes a storage medium, and a component configured to transition through a series of states. The component is further configured to record in the storage medium the state of the component every time the component communicates with another component in the system, the system being configured to recover the most recent state recorded in the storage medium following a failure of the component.

20070174695, Jul 26, 2007

Jun 15, 2006

11/424350

Srinidhi Varadarajan - Blacksburg VA, US
Joseph Ruscio - Blacksburg VA, US

G06F 11/00

714015000

Log-Based Rollback Recovery for system failures. The system includes a storage medium, and a component configured to transition through a series of states. The component is further configured to record in the storage medium the state of the component every time the component communicates with another component in the system, the system being configured to recover the most recent state recorded in the storage medium following a failure of the component.

20070277056, Nov 29, 2007

Nov 17, 2004

10/595857

Srinidhi Varadarajan - Blacksburg VA, US
Joseph Ruscio - Blacksburg VA, US

VIRGINIA TECH INTELLECTUAL PROPERTIES, INC. - Blacksburg VA

G06F 11/00

714015000

A distributed system for creating a checkpoint for a plurality of processes running on the distributed system. The distributed system includes a plurality of compute nodes with an operating system executing on each compute node. A checkpoint library resides at the user level on each of the compute nodes, and the checkpoint library is transparent to the operating system residing on the same compute node and to the other compute nodes. Each checkpoint library uses a windowed messaging logging protocol for checkpointing of the distributed system. Processes participating in a distributed computation on the distributed system may be migrated from one compute node to another compute node in the distributed system by re-mapping of hardware addresses using the checkpoint library.

20080222219, Sep 11, 2008

Feb 20, 2008

12/034300

Srinidhi Varadarajan - Blacksburg VA, US

APPASSURE SOFTWARE, INC. - Great Falls VA

G06F 17/30

707204, 707E17005

In a method and apparatus for retrieving data from a snapshot data storage system, for each epoch, a snapshot including (i) all changed data, and (ii) an index is created. The index includes an entry for each page that has changed during the epoch. For rapidly retrieving the data as of any given time, the method creates a hash table that includes an entry for each data page that has changed since the baseline was created. The hash table entry indicates the epoch in which the data most recently changed and an offset corresponding to the location of the changed data in the corresponding snapshot. The hash table is created by inserting an entry for each page in the most recent index, and then examining the remaining indices for all other snapshots from the most recent to the oldest snapshot and adding any non-duplicate entries into the table.

20090049449, Feb 19, 2009

Jul 24, 2008

12/179477

Srinidhi VARADARAJAN - Santa Clara CA, US

G06F 9/50

718104

An apparatus and method for controlling resources in a computing system including receiving an allocation request for a resource; determining whether an allocation limit for the resource has been reached; and, restricting access to the resource upon determination that the allocation limit has been reached.

20090133029, May 21, 2009

Nov 12, 2008

12/269801

Srinidhi VARADARAJAN - Radford VA, US
Joseph Ruscio - San Francisco CA, US
Michael Heffner - Blacksburg VA, US

G06F 9/50

718104

Methods and systems for preemption of software in a computing system that include receiving a preempt request for a process in execution using a set of resources, pausing the execution of the process; and releasing the resources to a shared pool.