public File getPerfTestDirectory(String id) {
		File file = new File(getPerfTestDirectory(), id);
		// For backward compatibility
		if (!file.exists()) {
			file = getDistributedFolderName(id);
		}
		return mkDir(file);
	}
Get the perftest base directory for the given perftest id.

@param id perftest id
@return {@link PerfTest} sub directory.
ngrinder-controller/src/main/java/org/ngrinder/common/model/Home.java