các đại lý có thể tìm thấy giải pháp tối ưu sẽ có một giá trị thể dục cao hơn, các tuyến đường của họ sẽ có mức độ pheromone dày đặc hơn, thu hút các đại lý hơn để lựa chọn chúng và các tác nhân xấu với một thấp hơn tập thể dục giá trị sẽ điều chỉnh hướng của họ đi du lịch (hoặc các hành vi khác) bằng cách làm theo các đại lý tốt. | 9 Multiagent Communication for e-Business Using Tuple Spaces 229 Case 3 Distributed Market Places Test Data Number of physical nodes machines 8 Number of seller agents 10 Number of distributed market places 4 Comments. Refer to Fig. . When the number of buyer agents is not large less than 50 the application performance of tuple space is not worse than that of ACL. As we already know that in message passing agents in one container send their messages sequentially. In the case of using distributed tuple spaces the agents in a container can access the different tuple spaces concurrently. This provides real concurrent activities of agent couplings. When the number of buyer agents exceeds 50 the performance of tuple space becomes worse because more synchronized access to the distributed tuple spaces block the accessing processes. Distributed market place seems to result in a lower breakpoint from 70 to 50 compared with centralized market place . This may be attributed to the behavioral pattern of agents in the use of these markets and the actual concurrency that is achieved. Case 4 Group Purchase Test Data Number of physical nodes machines 8 Number of seller agents 10 Number of distributed market places 4 Total number of buyer agents 30 Comments. Refer to Fig. . Tuple space supports agent collaborations more efficiently than message passing in all cases of group buying. When the group size increases more buyer agents join the group in buying. Once the group relationship is established communication loads between agents decrease as a much less number of buying transactions are involved. As a result the performance gets better. Moreover the characteristics of tuple space global information sharing bulk template match and reactive tuples introduced in TSAF seem to have a strong positive impact on agent collaborations. From this comparison though not very exhaustive we observe that using tuple spaces as the coupling medium does not produce worse application .
