If you run TopHat (rna-seq aligner) or any other program that can run on a multi-core system, it is useful to know the number of cores in the system. My MacBook pro revealed to me that it is a single processor but 2 core, which can be specified on the TopHat command line:
Model Name: MacBook Pro
Model Identifier: MacBookPro6,2
Processor Name: Intel Core i5
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache (per core): 256 KB
L3 Cache: 3 MB
Memory: 4 GB
Processor Interconnect Speed: 4.8 GT/s
Boot ROM Version: MBP61.0057.B0C
SMC Version (system): 1.58f16
Serial Number (system): ()
Hardware UUID: ()
Sudden Motion Sensor:
State: Enabled
Model Name: MacBook Pro
Model Identifier: MacBookPro6,2
Processor Name: Intel Core i5
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache (per core): 256 KB
L3 Cache: 3 MB
Memory: 4 GB
Processor Interconnect Speed: 4.8 GT/s
Boot ROM Version: MBP61.0057.B0C
SMC Version (system): 1.58f16
Serial Number (system): ()
Hardware UUID: ()
Sudden Motion Sensor:
State: Enabled