Bull Sas

Benoit Welterlen

Philippe Couvee

Sébastien Dugue

Zoltan Menyhart

Yann Kalemkarian

Philippe Garrigues

Simon Derr

Frederic Temporelli

Francois Wellenreiter

Xavier Bru

Frédéric Temporelli

Christophe Laferriere

The invention relates to a method of fault management in a network of nodes (), comprising, for each node considered () of all or part of the nodes () of the network performing one and the same calculation: firstly, a step of local backup of the state of this node considered (), at the level of a storage medium () for this node considered (), the link () between this storage medium () and this node considered () being able to be redirected from this storage medium () to another node (), thereafter, a step of relaunching: either of the node considered () if the latter is not defective, on the basis of the local backup of the state of this node considered (), or of an operational node () different from the node considered (), if the node considered () is defective, on the basis of the recovery of the local backup of the state of this node considered (), by redirecting said link () between the node considered () and its storage medium () so as to connect said storage medium () to said operational node (), the local backups of these nodes considered (), used for the relaunching steps, are mutually consistent so as to correspond to one and the same state of this calculation.

Method of fault management in a network of nodes and associated part of network of nodes

The invention relates in particular to optimizing memory access in a microprocessor including several logic cores upon the resumption of executing a main application, and enabling the simultaneous execution of at least two processes in an environment including a hierarchically organized shared memory including a top portion and a bottom portion, a datum being copied from the bottom portion to the top portion for processing by the application. The computer is adapted to interrupt the execution of the main application. Upon an interruption in the execution of said application, a reference to a datum stored in a top portion of the memory is stored, wherein said datum must be used in order to enable the execution of the application. After programming a resumption of the execution of the application and before the resumption thereof, said datum is accessed in a bottom portion of the memory in accordance with the reference to be stored in a top portion of the memory.

Method for optimizing memory access in a microprocessor including several logic cores upon resumption of executing an application, and computer implementing such a method

The subject of the invention is in particular the optimization of standby management of a part of a microprocessor allowing implementation of at least two logic cores, said at least one microprocessor comprising means for placing at least one resource non common to said at least two logic cores on standby. After having determined () a desired standby state for each of said at least two logic cores, said desired standby state of one of said at least two logic cores is compared with the said desired standby state of the other of said at least two logic cores. In response to said comparison, instructions preparing for said placement on standby and/or allowing the restoration of said one of said at least two logic cores are launched ().

Method for optimizing management of standby of a microprocessor enabling the implementation of several logical cores and computer program implementing such a method

A method of operating a computer system in communications, via a communication network, with a server comprising an image of a kernel of a minimal operating system and an image of an associated file system for the computer system includes loading, via the communication network, the kernel image from the server to the computer system in accordance with a network transfer protocol interface, and loading, via the communication network, the file system image from the server to the computer system in accordance with the same network transfer protocol interface used to load the kernel image, wherein the loading of the kernel image from the server to the computer system is launched before the loading of the file system image from the server to the computer system is completed, and wherein the loading of the file system image from the server to the computer system is launched before the loading of the kernel image from the server to the computer system is completed.

Method and device for optimizing loading and booting of an operating system in a computer system via a communication network

The invention relates in particular to the optimization of the execution of a software application in a system having multiprocessor architecture including a plurality of input/output controllers and secondary processing units. After determining () the system topology, a call to a function to be executed by a secondary processing unit is intercepted (). The main processor that generated said call is identified (). A secondary processing unit is then identified () according to the main processor identified and according to the topology of said system. Advantageously, the secondary processing unit thus identified is the secondary processing unit that is the closest to the identified main processor. The call is then modified () in order to force the execution of at least one part of the function called in the identified secondary processing unit.

Method and device for optimizing execution of software applications in a multiprocessor architecture comprising several input/output controllers and secondary computing units

Growing community of inventors

Grenoble, France

Benoit Welterlen