Message Passing in Java MPJ

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Message Passing in Java (MPJ)

• Aamir Shafi
• aamir.shafi_at_port.ac.uk
• Distributed Systems Group
• 3rd June, 2004

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Introduction

• Parallel Programming
• Shared Memory
• Message Passing
• PVM
• MPI
• C Binding
• Fortran Binding
• Java, a popular distributed systems programming
  language
• Portable, write once, run anywhere
• Support for non-blocking I/O
• Performance for network applications is
  comparable to C on Fast Ethernet

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Building a Message Passing System in Java
MPJ API
mpjdev
Native mpjdev
VIA mpjdev
JNI
VIA
Native MPI
Sockets
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mpjdev Introduction

• Meant for library developers (MPJ), not
  application programmers
• Main Features
• Starts-up the device
• Implementation of Communication protocols
• Eager-Send
• The sender assumes that the receiver has infinite
  buffer space
• Rendezvous
• There is an exchange of control message before
  the actual message is being sent
• Packing/Unpacking of message

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MPJ Point to Point Communication
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MPJ Collective Communications
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MPJ runtime
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Conclusion

• Performance of mpjdev is reasonable
• Currently working on Point to Point
  communications of MPJ
• Questions
• ?