1. 30 Jul, 2003 4 commits
  2. 18 Jul, 2003 1 commit
  3. 10 Jul, 2003 3 commits
  4. 09 Jul, 2003 2 commits
  5. 08 Jul, 2003 2 commits
  6. 01 Jul, 2003 1 commit
    • Robert Ricci's avatar
      Give assign the ability to make dynamic pclasses. Here's how it works: · fbcd6752
      Robert Ricci authored
      After building the set of pclasses normally, we make another pass
      through the vnodes. The goal to create a pclass for each individual
      node. We disable the node's 'own' pclass to begin with. Then, the
      _first_ time it gets a vnode mapped to it, we remove it from the
      'regular' pclass it belongs to, and enable it's own pclass. Then, if
      it goes empty, we put it back in its regular pclass and disable it's
      own.
      
      The point of this is to replace -p for use with multiplexed nodes.
      Instead of disabling pclasses altogheter, which has serious
      performance implications, we can instead be smart about which pnodes
      remain equivalent (because nothing's been mapped to them), and which
      are now different. The result is that on my test topoloy, the time to
      get a good mapping has gone from over 3 minutes to about 6 seconds.
      
      This feature is enabled with the -d option, and the -P option is
      pretty much mandatory when using it, since it greatly exacerbates the
      problem of cruft in the ptop file.
      
      This satisfies #14 from the todo file:
      14.  do dynamic pclasses
      
      Also bumped up the minimum neighborhood size from 500 to 1000. In some
      tests I was doing, this resulted in better solutions.
      fbcd6752
  7. 26 Jun, 2003 2 commits
    • Robert Ricci's avatar
      Change around some data structures to make certain functions faster - · 55566879
      Robert Ricci authored
      turns out that getting iterators to the STL hash_* data structures is
      really slow, so for some that won't be very big, use the non-hash
      version.
      
      Buys something like a 30% speedup for large topologies.
      55566879
    • Robert Ricci's avatar
      Major changes to the way assign handles LAN nodes. · 83cfa8ec
      Robert Ricci authored
      LAN nodes are no longer treated specially. Instead, I've introduced
      the idea of 'static' types (old-style types retroactively become
      'dynamic' types). While a pnode can only satisfy one dynamic type at a
      time, it can always satisfy its static types (assuming it has enough
      capacity left.) Static types are flagged by prepending them with a '*'
      in the ptop file. So, for example, you may give switches the
      '*lan:10000' type so that they can satisfy virtual LAN nodes. Of
      course, other pnodes can have this type too, so that we can get
      'trivial LANs'.
      
      Actually, removing special treatment for LANs cleans up a lot of code.
      However, it may have some negative impacts on solutions, since we're
      not as smart about where to place LAN nodes as we used to be (they get
      annealed along with everything else, and not migrated.) I haven't seen
      any evidence of this yet, however.
      
      This leaves us with a single type of special pnode, a switch.
      
      Also added a new bit of syntax in ptop files - when '*' is given as a
      the maxiumum load for a type, the node is allowed to take on an
      infinite (well, actually, just a really big number of) vnodes of that
      type.
      
      ptopgen was modified to always report switches as being capable of
      hosting LANs, and assign_wrapper now understands direct links to LANs,
      which is what we get when the LAN is hosted directly on a switch.
      
      Fixed a bug in scoring direct links, in which the penatly was being
      added once when a direct link was mapped, but subtracted only once
      when it was freed.
      
      Added a '-T' option for doing simple self-testing. When adding a node
      to the solution, assign records the score, adds the node, removes it
      again, and checks to make sure that the resulting score is the same as
      the original score. The usefulness of this feature in debugging
      scoring problems cannot be understated...
      83cfa8ec
  8. 23 Jun, 2003 1 commit
  9. 20 Jun, 2003 1 commit
  10. 29 May, 2003 1 commit
  11. 28 May, 2003 1 commit
    • Robert Ricci's avatar
      Added the TRIVIAL_LINK_BW option, which allows, in the ptop file, · 5c67bf1f
      Robert Ricci authored
      specification of how much bandwidth can be used on the node for
      trivial links. Clearly, there will be some limit to loopback
      transfers, and this makes assign aware of it.
      
      While I was in there, cleaned up and commented some of the code I was
      working on.
      
      Also fixed a bug with the type pre-check and emulated links that are
      trivial_ok - we can't add these into the total for a vnode, because
      they could end up being satisified with trivial links.
      5c67bf1f
  12. 02 May, 2003 1 commit
  13. 30 Apr, 2003 2 commits
  14. 28 Apr, 2003 2 commits
  15. 18 Apr, 2003 1 commit
  16. 17 Apr, 2003 2 commits
    • Robert Ricci's avatar
    • Robert Ricci's avatar
      Several changes to assign: · 1003657e
      Robert Ricci authored
      Add features and desires to the PER_VNODE_TT restrictions. For
      desires, we can tell the user which ones can't be satisfied, but for
      features, we don't even try to figure out which one(s) keep us from
      mapping. From the assign_todo file, this is:
      9.   add features/desires to PER_VNODE_TT restrictions
      
      Add a new -P switch, when PER_VNODE_TT is in use. This casues it to
      prune out pclasses that no vnode can map to - this can lead to _huge_
      time savings, particularly since we put things like wide-area nodes
      into the ptop file. I've seen a 98% reduction in time when using both
      -p and -P! But, it's not the default yet, because I need to do more
      testing to make sure that this isn't hurting solution quality
      significantly.  todo item:
      8.   prune pclasses when using PER_VNODE_TT
      
      Standardize the exit values from assign:
      On success, returns 0
      On failures that are not retryable (ie. this top can never be mapped
          to this ptop), returns 2
      If SA fails to find a solution (ie., we might consider retrying),
          returns 1
      
      Fix a bug that has annoyed me for a very, very long time - if the
      input files don't exist, exit instead of hanging forever!
      
      Make the weight at which a feature/desire is considered 'hard' (ie. it
      generates a violation if unsatisifed or undesired) a variable, so that
      we'll be able to change it from 1.0 if we want.
      
      Put some more messages that should appear inline in the mail to stderr
      instead of stdout.
      1003657e
  17. 16 Apr, 2003 2 commits
    • Robert Ricci's avatar
      Added another TODO item. · 09fd9a02
      Robert Ricci authored
      09fd9a02
    • Robert Ricci's avatar
      Fix PER_VNODE_TT to work with vclasses and emulated links. Now, we can turn it · 690ec56d
      Robert Ricci authored
      on in production!
      
      PER_VNODE_TT handles emulated links by simply adding up the total bandwidth
      consumed by a vnode, and the total bandwidth available on each pnode. Of
      course, this can lead to false positives (knapsack problem), but that's okay,
      because it just means we won't bail up front - we'll have to do the full
      annealing pass before we decide it's unmappable.
      
      PER_VNODE_TT now also tries to figure out why a vnode is not mappable - if
      there are _no_ pclasses that match one of the restrictions, it will print out
      something like:
        *** No possible mapping for nodeA
            Too many links!
        *** No possible mapping for nodeB
            Too much bandwidth on emulated links!
      
      This completes the following two items from assign_todo.txt:
      
      6.   fix PER_VNODE_TT and vclasses
      7.   fix PER_VNODE_TT and emulated vlinks
      690ec56d
  18. 15 Apr, 2003 1 commit
  19. 14 Apr, 2003 3 commits
  20. 25 Mar, 2003 1 commit
  21. 23 Mar, 2003 1 commit
  22. 21 Mar, 2003 1 commit
  23. 20 Mar, 2003 1 commit
    • Robert Ricci's avatar
      Two changes: · 4c25a593
      Robert Ricci authored
      First, don't select a plink for an emulated link that would cause us
      to go over bandwidth.
      
      Second, make FIX_PLINK_ENDPOINTS the default, and add a #define that
      makes it the default (instead of having to specify it on each plink
      line.)
      4c25a593
  24. 14 Mar, 2003 1 commit
  25. 10 Mar, 2003 1 commit
  26. 06 Mar, 2003 1 commit