what is the Difference between PBA and GBA

Path based analysis Vs Graph based analysis 

• In GBA mode the tool consider both the worst slew and worst arrival in a path during the analysis
• In PBA mode the tool consider the path by  path 
• for setup analysis ,in GBA it will consider worst values among all the four values (observe the below picture), For PBA it will consider path by path and timing arc by  timing arc
• For hold analysis, in GBA it will consider best value (less value) among all the four values
• Conclusion is GBA is more pessimistic than PBA
• PBA with AOCV is the Best Timing 
• mindelay _GBa <= mindelay PBA
• max_delay GBA >= max_delay in PBA