While sorting machines by load, the load of a machine (machine->currentJobs) can be changed by other threads. If that happens, the comparator is no longer a proper ordering, in which case std::sort() can segfault. So we now make a copy of currentJobs before sorting.
To start hacking on Hydra, run:
$ ./dev-shell
$ ./configure $configureFlags --prefix=/opt/hydra
$ make
$ make install
Or, if you just want to build from source (on x86_64-linux):
$ nix-build -A build.x86_64-linux release.nix
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