9. An apparatus for storing at least one file generated by a distributed application in a parallel computing system, wherein said file comprises a plurality of sub-files, comprising: a memory; and at least one hardware device operatively coupled to the memory and configured to: obtain a user specification of semantic information related to said file; determine semantically meaningful sub-file boundaries for said plurality of sub-files based on said semantic information; provide said semantic information as a data structure description to a data formatting library write function, wherein said semantic information is dependent upon a content of said file; and store said semantic information related to said file with additional metadata related to said file and with one or more of said sub-files using said determined semantically meaningful sub-file boundaries in one or more storage nodes of said parallel computing system.
9. An apparatus for storing at least one file generated by a distributed application in a parallel computing system, wherein said file comprises a plurality of sub-files, comprising: a memory; and at least one hardware device operatively coupled to the memory and configured to: obtain a user specification of semantic information related to said file; determine semantically meaningful sub-file boundaries for said plurality of sub-files based on said semantic information; provide said semantic information as a data structure description to a data formatting library write function, wherein said semantic information is dependent upon a content of said file; and store said semantic information related to said file with additional metadata related to said file and with one or more of said sub-files using said determined semantically meaningful sub-file boundaries in one or more storage nodes of said parallel computing system. 10. The apparatus of claim 9 , wherein said semantic information provides a description of data in said file.