try launching it with "ccminer --config=config.conf" where config.conf contains:
{
"_comment1" : "Possible keys are the long options (ccminer --help)",
"_comment2" : "todo: support /* comments */",
"api-bind": "127.0.0.1:4068",
"statsavg": 20,
"quiet" : false,
"debug" : false,
"protocol" : false,
"cpu-priority" : 3,
"algo" : "cryptonight",
"launch-config" : "32x16",
"url" : "Your.Pool",
"user" : "Your.Wallet",
"pass" : "x"
}
This said, for having compared xmr-stak and ccminer, the former performs roughly 10% better on my GTXs