Abstract:
The invention relates to a method for managing access to shared resources within a multi-processor or multi-computer environment, including while these processors are working in a physical parallelism. Such an access management is particularly useful for carrying out a control of the accesses to such resources, for example for shared memory, in order to stabilise or optimise the functioning of a process within a multi-task application using such a parallel environment. This method comprises in particular, during at least one (SchA) of its activation periods, a first task termed accessing (TA), in response to a request for access (InstrA) to said target resource, allocates an access termed continuous to said target resource, i.e. in order to exclude any access to said target resource (ShMPi) by at least one second task (TB) during the entire activation period (SchA) of the accessing task immediately after said request for access.
Abstract:
The invention relates a method for controlling a software application in a multi-computer architecture (cluster). Said control can be applied, for example for analysis or modification of the environment thereof in a transparent as possible manner with respect to said application. The control is applicable for analysing, capturing and restoring operations of the status of one or several application processes. Said operations use a controller which is external to the application and injects system call instructions into the working memory of the controllable process(es).
Abstract:
This invention relates to a method for replaying, from a log file, internal events within a process belonging to a software application in a network. This method comprising the following steps: executing at least one replay instruction by the target process, initiating a replayed operation (EVI) that returns, to this target process (PB 1 ), at least one result datum obtained (RRJ) by this replayed operation; performing, by a software agent (PRI) external to the restart process, a forcing process ( 7 ) comprising a forcing operation upon the target process, instead and in place of the replay result datum (RRJ), of a forced datum, (RLi), extracted from logging data. Advantageously, the target process (PB 1 ) executes the replay instruction of its own initiative from its executable file (EXE; FIG. 7 ).
Abstract:
This invention relates to a system and method for the management, more particularly by external, transparent and non-intrusive control, of the running of one or more software tasks within a multi-task application executed on a computer or a network of computers. This management comprises in particular a recording of the running of these tasks in the form of logging data, as well as a replay of this running from such logging data in order to present a behaviour and a result corresponding to those obtained while logging. The invention also relates to a system implementing such a method in the management of the functioning of the software applications that it executes.
Abstract:
This invention relates to a method for replaying, from a log file, internal events within a process belonging to a software application in a network. This method comprising the following steps: executing at least one replay instruction by the target process, initiating a replayed operation (EVI) that returns, to this target process (PB 1 ), at least one result datum obtained (RRJ) by this replayed operation; performing, by a software agent (PRI) external to the restart process, a forcing process ( 7 ) comprising a forcing operation upon the target process, instead and in place of the replay result datum (RRJ), of a forced datum, (RLi), extracted from logging data. Advantageously, the target process (PB 1 ) executes the replay instruction of its own initiative from its executable file (EXE; FIG. 7 ).
Abstract:
A method, computer program and system for controlling accesses to memory by threads created by a process executing on a multiprocessor computer. A pa ge table structure is allocated for each new thread and copied from the exis ting threads. The page access is controlled by a present bit and a writable bit. Upon a page fault the access is provided to one thread. The kernel hand les the new page entry creation process and set the page present bits to zer o which creates page faults. In a second embodiment, two page table structur es are created, one for one thread having access to the address space and th e other page table structure shared by all the other threads having not acce ss to the address space.
Abstract:
An executable file (E) having references (F1,F2,F3) with functions in a shared library (B) may be non intrusively modified by creating a META file with unresolved references (F2,F3) in the executable file and a services file which has new functions or services (X2,X3) to be inserted into the executable file. During an editing phase links to the META file are made which allow functions in the service file and/or the shared library to be executed : An independent claim is made for a system which uses the method and includes a META and service file.