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Shared Memory Management for VisualWorks

Shared Memory Management for VisualWorks. Holger Guhl Senior Smalltalker at Georg Heeg eK www.heeg.de mailto: holger@heeg.de. Shared Memory Management for VisualWorks. What ?. shared memory. Why?. http://www.flickr.com/photos/ben_salter/.

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Shared Memory Management for VisualWorks

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  1. Shared Memory Management for VisualWorks

  2. Holger Guhl • Senior Smalltalker at Georg Heeg eK • www.heeg.de • mailto: holger@heeg.de

  3. Shared Memory Management for VisualWorks

  4. What? shared memory Why? http://www.flickr.com/photos/ben_salter/

  5. Personal Experience:software assessment project huge customer project took 4 hours!

  6. Polycephaly = useall CPUs

  7. PolycephalyExample | drones result | drones := VirtualMachines new: 4. result := drones do: '[:a :b | a + b]' with: #(1 2 3 4 5) with: #(5 4 3 2 1). result = #(6 6 6 6 6)

  8. Project “Software Assessment” Needs toreportmuchresults Perfectoptionsfortaskdistribution (per package, class) • Disappointingresults: • Communication overhead consumed all time gains

  9. Shared Memory = morespeed?

  10. Tools Architecture

  11. ApplicationScheme CPU 1 CPU 2 Remote Semaphore MASTER DRONE Shared Memory

  12. RemoteSemaphore • MutuallyexclusiveShared Memory access • Createdbymasterimage • Twin in droneimage • Synchronizedvia OS eventmessages

  13. SemaphoreEventRelay • Organize connection to other images • Instances in connected images • Communication center for remote semaphore messages • #signalRemote • #waitRemote

  14. SharedMemory-ExampleApp • Install Shared Memory • Start Polycephaly drone. • Start drone client, use Shared Memory. • Start drone service for pure Shared Memory use cases. • Run profiler.

  15. Time Profiles

  16. Shared memory raw read/write

  17. Shared memory raw read/write

  18. SharedMemory Overhead • SemaphoreEventRelaymutex roundtrip • with OS event messages = 117 µs • with UDP socket messages = 399 µs

  19. Polycephaly Use Cases Overhead: Request to evaluate the empty block = 12,519 µs

  20. Polycephaly with Shared Memory • Polycephaly requests, result via protected shared memory

  21. Shared Memory Command And Data Exchange • Shared memory command, protected write, unprotected read

  22. FractalExplorer Shared Memory dataexchangesaves 5 seconds from a total of 109 seconds…

  23. Conclusions • Shared Memory can speed up transfer significantly • massive data exchange • simple data • Impressive reduction potential of 97% • Perspectives for applications that suffer from high load for data exchange.

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