elapsed_time file now contains the date so as not to be overwritten on re-running the pipeline.

lib/pipeline.ml

@@ -390,7 +390,7 @@ let validation_main ~outdir ?(indir = "") ?(ns = 0) ?(np = 2) ?(mem = 2) ~previe
   in
   let repo = (Repo.shift "Simulated_datasets" sim_repo_l#repo) @ (Repo.shift "Real_datasets" repo_real_trees) in
   Repo.build ~outdir ~np ~mem:(`GB mem) ~logger repo ;
-  time_logger#report sim_repo_l#dataset_results (Filename.concat outdir "elapsed_time.tsv")
+  time_logger#report sim_repo_l#dataset_results (Filename.concat outdir ("elapsed_time_" ^ (Unix.time () |> int_of_float |> string_of_int) ^ ".tsv"))
 
 let simulation_command =
   let open Command.Let_syntax in