A method comprising: independently compiling a plurality of modules of source code to generate a plurality of respective object modules comprising a plurality of respective parallel threads explicitly designated by a user to be executed in parallel on a target platform; in each of the object modules, inserting at least one symbol indicative of a usage of a resource of the target platform associated with the respective thread; executing a linker to perform a linking process for linking the object modules, wherein the linking process comprises assessing the symbols in conjunction with one another, and based on the assessment generating an indication relating to a usage of the resource required for execution of the threads in parallel.