A method for managing a buffer memory space associated with a persistent data storage system of a computing machine, said buffer memory space being suitable for temporarily storing in the RAM of the machine a set of portions of a single and the same data file of the persistent data storage system, said portions having respectively been previously accessed by one or more processes executed on the computing machine, the method comprising the following steps implemented by an operating system of the machine: - the association of a determined descriptor among a plurality of buffer memory projection descriptors with a portion of the file when said portion of the file is pojected into the buffer memory space, said association being a function of the index of the bytes of the file in the storage system, wherein an index is a reference making it possible to identify the considered portion of the file within memory units to which the portion of the file belongs, and where the partitioning of the file and the distribution of the portions of file matching the plurality of projection descriptors in buffer memory is carried out by associating M interleaved zones of the file respectively with M projection descriptors in buffer memory , where M is a determined integer. - the tracing of each of the portions of the file projected into the buffer memory space by the determined associated descriptor , said associated descriptor belonging to the plurality of projection descriptors in buffer memory that are all associated, each tracking a subset of the set of portions of the file projected into the buffer memory space; - the processing of a request for access to a portion of the file by a process executed on the machine, using the projection descriptor in buffer memory associated with said portion of file to identify whether said portion of the file is projected into the buffer memory space. - the association of a determined descriptor among a plurality of buffer memory projection descriptors with a portion of the file when said portion of the file is pojected into the buffer memory space, said association being a function of the index of the bytes of the file in the storage system, wherein an index is a reference making it possible to identify the considered portion of the file within memory units to which the portion of the file belongs, and where the partitioning of the file and the distribution of the portions of file matching the plurality of projection descriptors in buffer memory is carried out by associating M interleaved zones of the file respectively with M projection descriptors in buffer memory , where M is a determined integer. - the tracing of each of the portions of the file projected into the buffer memory space by the determined associated descriptor , said associated descriptor belonging to the plurality of projection descriptors in buffer memory that are all associated, each tracking a subset of the set of portions of the file projected into the buffer memory space; - the processing of a request for access to a portion of the file by a process executed on the machine, using the projection descriptor in buffer memory associated with said portion of file to identify whether said portion of the file is projected into the buffer memory space. <EOS>