1. 06 Feb, 2002 1 commit
  2. 04 Feb, 2002 1 commit
  3. 24 Jan, 2002 1 commit
  4. 26 Nov, 2001 1 commit
    • simonmar's avatar
      [project @ 2001-11-26 16:54:21 by simonmar] · dbef766c
      simonmar authored
      Profiling cleanup.
      
      This commit eliminates some duplication in the various heap profiling
      subsystems, and generally centralises much of the machinery.  The key
      concept is the separation of a heap *census* (which is now done in one
      place only instead of three) from the calculation of retainer sets.
      Previously the retainer profiling code also did a heap census on the
      fly, and lag-drag-void profiling had its own census machinery.
      
      Value-adds:
      
         - you can now restrict a heap profile to certain retainer sets,
           but still display by cost centre (or type, or closure or
           whatever).
      
         - I've added an option to restrict the maximum retainer set size
           (+RTS -R<size>, defaulting to 8).
      
         - I've cleaned up the heap profiling options at the request of
           Simon PJ.  See the help text for details.  The new scheme
           is backwards compatible with the old.
      
         - I've removed some odd bits of LDV or retainer profiling-specific
           code from various parts of the system.
      
         - the time taken doing heap censuses (and retainer set calculation)
           is now accurately reported by the RTS when you say +RTS -Sstderr.
      
      Still to come:
      
         - restricting a profile to a particular biography
           (lag/drag/void/use).  This requires keeping old heap censuses
           around, but the infrastructure is now in place to do this.
      dbef766c
  5. 23 Nov, 2001 1 commit
  6. 22 Nov, 2001 1 commit
    • simonmar's avatar
      [project @ 2001-11-22 14:25:11 by simonmar] · db61851c
      simonmar authored
      Retainer Profiling / Lag-drag-void profiling.
      
      This is mostly work by Sungwoo Park, who spent a summer internship at
      MSR Cambridge this year implementing these two types of heap profiling
      in GHC.
      
      Relative to Sungwoo's original work, I've made some improvements to
      the code:
      
         - it's now possible to apply constraints to retainer and LDV profiles
           in the same way as we do for other types of heap profile (eg.
           +RTS -hc{foo,bar} -hR -RTS gives you a retainer profiling considering
           only closures with cost centres 'foo' and 'bar').
      
         - the heap-profile timer implementation is cleaned up.
      
         - heap profiling no longer has to be run in a two-space heap.
      
         - general cleanup of the code and application of the SDM C coding
           style guidelines.
      
      Profiling will be a little slower and require more space than before,
      mainly because closures have an extra header word to support either
      retainer profiling or LDV profiling (you can't do both at the same
      time).
      
      We've used the new profiling tools on GHC itself, with moderate
      success.  Fixes for some space leaks in GHC to follow...
      db61851c
  7. 23 Jul, 2001 1 commit
    • simonmar's avatar
      [project @ 2001-07-23 17:23:19 by simonmar] · dfd7d6d0
      simonmar authored
      Add a compacting garbage collector.
      
      It isn't enabled by default, as there are still a couple of problems:
      there's a fallback case I haven't implemented yet which means it will
      occasionally bomb out, and speed-wise it's quite a bit slower than the
      copying collector (about 1.8x slower).
      
      Until I can make it go faster, it'll only be useful when you're
      actually running low on real memory.
      
      '+RTS -c' to enable it.
      
      Oh, and I cleaned up a few things in the RTS while I was there, and
      fixed one or two possibly real bugs in the existing GC.
      dfd7d6d0
  8. 19 Dec, 2000 1 commit
  9. 04 Dec, 2000 1 commit
  10. 09 Nov, 1999 1 commit
    • simonmar's avatar
      [project @ 1999-11-09 15:46:49 by simonmar] · 30681e79
      simonmar authored
      A slew of SMP-related changes.
      
       - New locking scheme for thunks: we now check whether the thunk
         being entered is in our private allocation area, and if so
         we don't lock it.  Well, that's the upshot.  In practice it's
         a lot more fiddly than that.
      
       - I/O blocking is handled a bit more sanely now (but still not
         properly, methinks)
      
       - deadlock detection is back
      
       - remove old pre-SMP scheduler code
      
       - revamp the timing code.  We actually get reasonable-looking
         timing info for SMP programs now.
      
       - fix a bug in the garbage collector to do with IND_OLDGENs appearing
         on the mutable list of the old generation.
      
       - move BDescr() function from rts/BlockAlloc.h to includes/Block.h.
      
       - move struct generation and struct step into includes/StgStorage.h (sigh)
      
       - add UPD_IND_NOLOCK for updating with an indirection where locking
         the black hole is not required.
      30681e79
  11. 02 Nov, 1999 1 commit
    • simonmar's avatar
      [project @ 1999-11-02 17:19:15 by simonmar] · c6ff5639
      simonmar authored
      Time the shutdown code as well as the initialisation code.  This
      figure is sometimes significant for SMP, because the tasks are all
      killed by a signal (at the moment) and it might take a while for the
      signal to be delivered.
      c6ff5639
  12. 15 Sep, 1999 1 commit
    • simonmar's avatar
      [project @ 1999-09-15 13:45:14 by simonmar] · 17315bf6
      simonmar authored
      Heap Profiling
      --------------
      
      This commit adds simple hp2ps-style heap profiling.  Just the '-h'
      option is supported so far.
      
      Heap profiles will show the top two cost centres on each cost centre
      stack.
      
      Time/Alloc profiles have been extended to aggregate the costs on a
      per-cost-centre basis and show the table of highest consuming cost
      centres before the full table of cost centre stacks.
      
      Profiles work best if '-caf-all' is used, especially when using
      one of the '-auto' flags.
      17315bf6
  13. 23 Feb, 1999 1 commit
  14. 05 Feb, 1999 1 commit
  15. 13 Jan, 1999 1 commit
    • simonm's avatar
      [project @ 1999-01-13 17:25:37 by simonm] · 4391e44f
      simonm authored
      Added a generational garbage collector.
      
      The collector is reliable but fairly untuned as yet.  It works with an
      arbitrary number of generations: use +RTS -G<gens> to change the
      number of generations used (default 2).
      
      Stats: +RTS -Sstderr is quite useful, but to really see what's going
      on compile the RTS with -DDEBUG and use +RTS -D32.
      
      ARR_PTRS removed - it wasn't used anywhere.
      
      Sanity checking improved:
      	- free blocks are now spammed when sanity checking is turned on
      	- a check for leaking blocks is performed after each GC.
      4391e44f
  16. 02 Dec, 1998 1 commit