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Latest news on JXTA and JuxMem-C/DIET

Latest news on JXTA and JuxMem-C/DIET. Mathieu Jan. GDS meeting, Rennes, 11 march 2005. Outline. Performance evaluation of JXTA in a grid context Overview of JuxMem-C Overview of initial use of JuxMem by DIET Roadmap. Enabling JXTA for High Performance Grid Computing.

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Latest news on JXTA and JuxMem-C/DIET

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  1. Latest news on JXTA and JuxMem-C/DIET Mathieu Jan GDS meeting, Rennes, 11 march 2005

  2. Outline • Performance evaluation of JXTA in a grid context • Overview of JuxMem-C • Overview of initial use of JuxMem by DIET • Roadmap

  3. Enabling JXTA for High Performance Grid Computing • Context: convergence of P2P and grid computing • Grid over P2P • New hypothesis for P2P systems • Efficiently use SANs and WANs • Performances of JXTA are not clear • Papers by Emir Halepovic • No in-depth explanations about the results • No precise details about the experimental setup (LAN, WAN) • Complex topologies (relays, etc): what is benchmarked? • Inconsistent results (Emir Halepovic, P3 project)

  4. Description of the Experimental Setup • Bidirectional bandwidth benchmark • JXTA • JXTA-J2SE 2.2.1 and 2.3.2 • JXTA-C (HEAD, 18 january) • Configured with TCP, direct communications • SANs benchmarks • Myrinet & Giga Ethernet (parasol & paraci) • WANs benchmarks • Grid 5000 (Rennes & Toulouse) • Delay = 11.2 ms / Bandwidth = 1Gb/s • Tuned TCP buffer sizes • Direct communications: unusual for P2P systems

  5. Endpoint service Pipe service JXTA Socket Endpoint service Pipe service JXTA Socket JXTA communications layers • - Data-stream interface • Reliability - Dynamic point-to-point communications TCP, HTTP, etc - Static point-to-point communications - Independant from underlaying network topology - Unreliable

  6. Bandwidth of JXTA-J2SE 2.3.2 over SANs Bandwidh of JXTA-J2SE 2.2.1: 145MB/s (endpoint service)

  7. Latency of JXTA over SANs

  8. Bandwidth of JXTA-C over SANs

  9. Fully exploiting SANs capacities: PadicoTM • Myrinet: OS-bypass mode • 2 Gb/s and 7μs • PadicoTM • High-performance framework for multithreading and networking • Virtual sockets • JXTA-C on top of PadicoTM • Modifications inside Apache Portable Layer (thread library) • Measurement bandwidth for the endpoint layer: 140 MB/s • Improvements by only 32 MB/s • Memory copies inside JXTA-C

  10. Bandwidth of JXTA-J2SE 2.3.2 over WANs Similar results for JXTA-J2SE 2.2.1

  11. Bandwidth of JXTA-C over WANs

  12. Discussion • JXTA-J2SE 2.2.1 nearly saturates SANs • Endpoint and pipe layer • Improved results for JXTA Sockets can be obtained by tuning output buffer size • Bandwidth degradation between JXTA-J2SE 2.2.1 and 2.3.2 • Latency improvements with JXTA-J2SE 2.3.2 • Memory copies inside JXTA-C • Prevents an efficient use of PadicoTM • Transparent use of features available in PadicoTM • Parallel streams • On-the-fly compression techniques

  13. New design of JuxMem • Goal: hide the complexity of JXTA to upper layers • Upper layers are consitency protocols • New layers: communication, search, memory and failure detector • Improved semantic for search layer • Based of JXTA discovery mechanism • JuxMem comm layer hides the JXTA comm layer used • Currently based on JXTA pipe service • Other implementations in progress • Implemented by JuxMem-J2SE and JuxMem-C • JXTA-J2SE 2.3.2 • JXTA-C HEAD + small patch

  14. Current status of JuxMem-C • JXTA service • Private deployment using own groups • Own net peer group (juxmem group) • Communication layer is working • Between JuxMem-C peers • Between JuxMem-C peers and JuxMem-J2SE peers • Search layer working only at a cluster level • JuxMem client is working!

  15. Roadmap of JuxMem-C • Search layer for alloc at the juxmem group level • Memory layer • Other types of JuxMem’s peer • Provider • Cluster manager (JXTA-C rdv peers are available!) • Data types in JuxMem • Wrapping file API access • etc • Consistency protocols :-)

  16. Current status of JuxMem-C/DIET • Simple targeted example: dmat_manips • A DIET SeD launches a JuxMem-C client (-ljuxmem) • The JuxMem-C client connects to JuxMem-J2SE cluster manager • The DIET SeD gets a reference on the JuxMem service • That’s all!

  17. Modifications inside DIET • C++ wrapper of JuxMem-C API (JuxMemImpl.[cc|hh]) • JuxMem API (JuxMemRead, JuxMemWrite, etc) • run() • Launches JXTA-C • Gets a reference on the JuxMem service • Modifications inside DIET_server.cc • Creates a JuxMemImpl object • Calls the run method • Calls the linkToJuxMem method • Modifications inside SeDImpl.[cc|hh] • JuxMemImpl attribute • linkToJuxMem • Update the reference on JuxMemImpl

  18. When DIET requests data to JuxMem • When a solve request is received (SeDImpl.cc) • Before the computation • After the computation • Currently for matrices only • diet_is_persistent_juxmem (macro) • JuxMemRead before the computation • Read the data blocks • Profile.parameters[i].desc.id != NULL • JuxMemMap after the computation • Allocate a data block • Profile.parameters[i].desc.id == NULL • JuxMemWrite after the computation • Always

  19. Possible questions for DIET experts • Enable trace levels • RTFM not yet done on this topic :-) • Cleaner configuration of DIET for JuxMem • For now --enable-JuxMem • Hardcoded paths • Any other methods needed by DIET? • Estimate data transfer time? • Other needed modifications inside DIET? • Other?

  20. Roadmap of JuxMem-C/DIET • dmat_manip example with JuxMem-C • Basic configuration • Demo in one month • Test JuxMem-C/DIET with consistency protocols • More complex JuxMem configurations • Cleanup in DIET for commit • JuxMem’s license • Release of JuxMem

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