common flags:
--gpu-platform 1 , Sets GPU platform. --gpu-platform 2 ,for only amd cards.
-I 20 , Intensityof GPU scanning. A lower value, will free up resources if you want to use your GPU for other task as well.
-g 2 ,or --g 2 , set threads pr gpu, can give higher hashrate if your cpu can handle it.
-d 0,1,2,3 , Devices specify what cards to use.
--thread-concurrency 1024 , Number of concurrent threads per GPU for mining. One value or a comma (,) delimited list.
--config failover.conf load a config file
[https://github.com/sgminer-dev/sgminer/blob/master/doc/configuration.md#config-file-and-cli-options Github has all the flags]