threadCount int
	// These token.* variables are set by makeTokens()
	tokenCount int
	// pre-computed response for a token
	tokenToResponse map[string]*cacheRecord
	// include audiences for some
	tokenToAuds map[string]authenticator.Audiences
	// a list makes it easy to select a random one
	tokens []string
}

func (s *singleBenchmark) makeTokens() {
	s.tokenToResponse = map[string]*cacheRecord{}