whati is mean of this sentence?

[kewenpan]

this sentence is followed:
"when the number of threads is large,sampling the space of potential job mixes may become less productive,as the size of the sample space grows exponentially with the number of threads"???

expecially,"the sampling the space of potential job mixes"

[Roman_D_Intel]

Hi,

could you provide us the context of this sentence? Is it from an Intel documentation?

Thanks,
Roman