Plan Max Manfrin

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History (past work)

http://iridia.ulb.ac.be/wiki/index.php/History_Max_Manfrin


Plan (future work)

Parallelization of ACO algorithms

Milestone I: Jan - Mar 2006

  • Acquire practical experience in explicit parallelization on ACO algorithms
    • Start from sequential ACOTSP and implement various MPI variants
      • Sync
        • Multicolony - fully-connected
          • colony 0 identifies the best colony; best colony broadcast its bsf solution
          • colony 0 identifies the best colony and the worst colony; best colony send its bsf solution to worst colony
        • Multicolony - ring
          • unidirectional ring
        • Multicolony - hypercube
          • 3D hypercube
        • Single colony, multi local search
      • Async
        • Multicolony - completly-connected
          • colony 0 identifies the best colony; best colony broadcast its bsf solution
          • colony 0 identifies the best colony and the worst colony; best colony send its bsf solution to worst colony
        • Multicolony - ring
          • unidirectional ring
        • Multicolony - hypercube
          • 3D hypercube
  • Paper submission to ANTS 2006 of "explicit parallelization of ACOTSP"
  • By end of March decision if and how to extend the paper for possible Journal article
  • By end of March decision if proceed with MPI version of ILK-H + ACOTSP
  • Find the sentence that explain what the PhD thesis is about (what is the contribution of this thesis?)
    • 1. Parallelization of ACO on multi-core architectures ?
    • 2. Parallelization of ACO on collection of interesting problems?


Milestone II: Apr - Jun 2006

  • Development and empirical test of different communication schema among colonies
The i.a.k identify how often we do communication among colonies. 

The law used to generate the periods is SQRT[(10)^(i+1)], so
i = 1 --> T = 10
i = 2 --> T = 31
i = 3 --> T = 100
i = 4 --> T = 316
i = 5 --> T = 1000
i = 6 --> T = 3162
i = 7 --> T = 10000
i = 8 --> T = 31622
i = 9 --> T = 100000

The jth exchange happens at iteration


      T * (1 - 0.a^j)/(1 - 0.a)  IF (int)[x_j - x_(j-1)] > k
x_j = 
      k                          OTHERWISE
  • Start from sequential ACOTSP and implement various MPI variants
    • Sync
      • Multicolony - ring
        • unidirectional ring
          • 4.8.10
          • 4.9.10
          • 5.8.10
          • 5.9.10
          • 6.8.10
          • 6.9.10
          • 7.6.10
          • 7.7.10
  • Identify possible problems for which IRIDIA has expertise and state-of-the-art ACO algo as starting points (Scheduling: Blum, QAP: Thomas)
    • Transfer the knowledge and experience on TSP to other problems
      • Start from sequential MMASQAP and implement various MPI variants
        • Sync
          • Multicolony - fully-connected
            • colony 0 identifies the best colony; best colony broadcast its bsf solution
              • 2.8.5
            • colony 0 identifies the best colony and the worst colony; best colony send its bsf solution to worst colony
              • 2.8.5
          • Multicolony - ring
            • unidirectional ring
              • 2.8.5
          • Multicolony - hypercube
            • 3D hypercube
              • 2.8.5
  • Collaboration with Marco Caserta on parallel ACO for Set Covering Problem
    • he doesn't use ACO for SCP, but I've helped him anyway to parallelize his own primal-dual algorithm
  • Collaboration with Daniele Catanzaro on parallel ACO for phylogeny reconstruction
    • Start from sequential ACO algorithm and implemented MPI variant
      • Sync
        • Multicolony - fully-connected
          • colony 0 identifies the best colony; best colony broadcast its bsf solution

Milestone III: Jul - Sep 2006

  • Tech Report on extended TSP experiments
    • decision if and how to extend the paper for possible journal article
  • Literature survey on parallel ACO algorithms (version 3)
  • Acquire practical experience in implicit parallelization on ACO algorithms
    • Start from sequential ACOTSP and implement various OpenMP variants
      • Sync ( i.e. implicit barrier in for directives)
      • Async (i.e use of the nowait clause)
  • ? Paper on "implicit vs explicit parallelization of ACOTSP"


Milestone IV: Oct - Dec 2006


Milestone V: Jan - Mar 2007


Milestone VI: Apr - Jun 2007


Milestone VII: Jul - Sep 2007

  • Write PhD thesis

Goals

  • Investigate the effect of parallelization on Ant Colony Optimization algorithms
  • Acquire practical experience in parallelization on ACO algorithms (both explicit and implicit parallelism)
  • Implicit parallelism is the new trend (multi core CPUs), not much work has been done on them yet


Things to do

Description Start date Deadline Time required status
Study OpenMP Jan 9, 2005 ongoing process In progress
Implicit parallelization of ACOTSP using OpenMP - - - Need a compiler
Parallel ACO survey v2 Apr 10, 2006


Weekly planning

Description Start date Deadline Completion date status Note
Disable the queues on the nodes r21, r24, r26, r27, r29, r31, r32, r33 Mar 29 done
Generate 2 instances with portgen (pgua3162.tsp, pgub3162.tsp) and 2 instances with portcgen (pgca3162.tsp, pgcb3162.tsp) done
Solve the generated instances to optimum with concorde and double check with ILK-H Mar 29 Mar 31 done pgua3162.tsp --> 50121985
pgub3162.tsp --> 47500868
pgca3162.tsp --> 18547858
pgcb3162.tsp --> 21884136
Patch the algorithms in such a way that they use restart and communication schema (no-comm for n/2 iter and then exchange bsf every n/4 iter).
SEQUENTIAL ALGORITHMS
PIR (no-restart) using 16 CPUs for 3600 sec on 6 instances Mar 29 Mar 31 Apr 3 done
SEQ (no-restart) on 1 CPU for 57600 sec on 6 instances Apr 4 Apr 11 done
SEQ3 (restart) on 1 CPU for 57600 sec on 6 instances Apr 4 Apr 11 done
PIR3 (restart) using 16 CPUs for 3600 sec on 6 instances Mar 31 Apr 3 Apr 4 done
SYNC ALGORITHMS
SR2 (no-restart) using 16 CPUs for 3600 sec on 6 instances Apr 11 Apr 13 done
SRW2 (no-restart) using 16 CPUs for 3600 sec on 6 instances Apr 13 Apr 16 done
SR3 (restart) using 16 CPUs for 3600 sec on 6 instances Apr 16 Apr 18 done
SRW3 (restart) using 16 CPUs for 3600 sec on 6 instances Apr 19 Apr 21 aborted
ASYNC ALGORITHMS
ACC3 (restart) using 16 CPUs for 3600 sec on 6 instances Apr 21 Apr 24 aborted

Seminars participation

Title Author Location Dates
IRIDIA Optimization meeting Ch. 4 of the book to present Apr 27, 2006

Events participation

Event Location Dates


Papers to write

Title Journal/Conference targeted Submission deadline
A Survey of Parallel ACO algorithms N.A. N.A.
Thread-level parallelization of ACOTSP N.A. N.A.


Referee activities

International journals

Journal # papers paper received on review to submit before


International conferences

Conference # papers paper received on review to submit before
WSC11 3-4 (estimation) May/June 2006 (estimation) 30 Jun 2006

IRIDIA chores

Chore assigned status
Update Dorigo website with Master, DEA, and PhD thesis data Feb 2, 2006 done
Create a Wiki page with list of all the software we have for the Mac with #licenses and where they are installed Apr 21, 2006
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