haskell-te: 29de4f7981d5fc35575c471814774b3af7118fe4

     1: From: Chris Warburton
     2: Date: Mon, 31 Jul 2017 17:54:08 +0100
     3: State: new
     4: Subject: Apply memory limits to individual buckets
     5: Message-Id: <d9c91ce7c958cbd0-0-artemis@nixos>
     6: 
     7: We can run MLSpec without a memory cutoff, but it's dangerous as it'll
     8: gladly eat up all of our RAM.
     9: 
    10: Instead, we apply a cutoff using withTimeout. That works, but it's a
    11: little bit crappy since the whole point of using buckets is that we get
    12: to use multiple processes. Hence we should allow our limits to be set on
    13: the individual runners, rather than the invoker.
    14: 
    15: One way to do this would be to augment `wrapper.sh` in nix-eval, e.g. to
    16: accept a new env var like `NIX_EVAL_WRAP_PROGRAM`. If found, that would
    17: be invoked with the given command (`runhaskell ...`) as an argument.
    18: 
    19: We can then set it to a script which calls `wrapProgram`. Note that we'd
    20: probably have to propagate any given limit through "manually", since it
    21: may be running in a different environment to our invoking CLI.
    22: 
    23: Note that MLSpec is used by hashspec as well, so this should apply to
    24: both.