The first number is the default CPU limit. The second number is the maximum CPU limit.
However, the default CPU limit is ignored because it is a higher value than the maximum CPU limit.
In this example, the lack of a second number specifies that there is no default CPU limit. The specified number is considered as the default and maximum CPU limit.
The first number is the default run limit. The second number is the maximum run limit.
The first number specifies that the default run limit is to be used for jobs that are submitted without a specified run limit (without the -W option of bsub).
No default run limit is specified. The specified number is considered as the default and maximum run limit.
No default thread limit is specified. The value 6 is the default and maximum thread limit.
The first value (6) is the default thread limit. The second value (8) is the maximum thread limit.