inmem is documented specifically as being the ones that are currently loaded, not a history of what has ever been loaded during the session. If a function has been cleared, it is no longer loaded. The workers logically unload after a parfor, so the loaded file is logically gone.
If workers do not unload after parfor, then you could, after a parfor, parfor "enough" to use all of the worker entries:
%maybe 50 will be enough to hit each worker at least once. Maybe not.
was_inmem = cell(50,1);
parfor K = 1 : 50
was_inmem = inmem('-completenames');
end
was_inmem = unique({was_inmem{:}});
My prediction is that it won't show anything.
Safer way: incorporate the above strategy right into your original parfor
was_inmem = cell(100,1);
parfor k=1:100
external_file(k);
was_inmem{k} = inmem('-completenames');
end
was_inmem = unique({was_inmem{:}});
