add following properties setting in smartgit.properties file:

smartgit.compare.innerLine.maximumLongLineCount=20000000

smartgit.core.jgit.similarityFileSizeLimit=104857600

smartgit.text.maxLineLength=50000

smartgit.compare.innerLine.maximumLineLength=20000000

smartgit.compareWindow.maximumFileSize=500000000

smartgit.changes.maximumFileSize=1048576000