19
Fig. 3.1. The PRESS Model
receiving messages. These threads remain blocked until there is a message to be sent
or received. When the receive thread wakes up, it determines which virtual interface
(VI) [30] receives the message and places a descriptor of the message in the queue shared
with the main thread. The main thread periodically polls this data structure [23]. To
forward requests based on the cache locality and load balance, this information should be
shared by all the nodes in the cluster. In PRESS, the cache information is broadcasted
whenever a cache is replaced. It employs broadcasting and piggy backing alternatively for
disseminating the load balance information. The PRESS design has been implemented
on an 8 node Linux cluster connected with a Giganet (cLAN) network that used VI as
the communication substrate. Measurement with real workloads provided about 29%
improvement in throughput compared to the TCP/IP implementation.












  

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