What are the best config memory and vcore in YARN and mapred multi-node cluster?

[#1]

I have a Hadoop cluster with these specifications:

PC1 --> master: Number of cores: 40 RAM 64G SSD250G
PC2 --> slave: Number of cores: 30 RAM 32G SSD128G
PC3 --> slave2: Number of cores: 30 RAM 32G SSD128G

in each slave, I'll create 2 containers for data nodes, at a total of 5 nodes will setup. Please guide me on what should be the best configuration for memory and vcore on yarn-site.xml and mapred-site.xml for better performance.

thanks