11th December 2007

Attendees

• brendan
• bsmedberg
• ed
• erik t
• jorendorff
• lars
• marcia
• markh
• moh
• rick r
• seo
• steven j

Status

Moh

• call graph in VTune working.
• waiting for mgmt decision on VTune availability, possibly via whatif.intel.com
• will look into adding JavaGrande to the VTune-profiled tests

Marsha

• filed https://bugzilla.mozilla.org/show_bug.cgi?id=407046
• also looking for comments on PowerPoint draft showing VTune profiling results, preliminary, mailing around for review
• looking at slide 3, vtune barchart of alioth debian shootout benchmarks
• question about debugger support costs reading too high
• Ed: should be possible to build in release mode but enable the right opcodes to build address maps for vtune
• Goal is to have a "Release VTune" configuration
• Markh asked about debug penalty, but needs that to get exception detail otherwise missing
• Brendan says a Tamarin in Firefox must have good exception details, source images in ReferenceError diagnostics, etc.
• Ed suggests starting from Release Debugger and optimizing hard
• Brendan points to ESC involvement, JS debugger APIs used by Firebug -- lots to do (will file bugs)

Markh

• implementing IDispatch in ScreamingMonkey Tamarin glue
• questions:
  • use of MI and templates, specifically some GCRoot inheritors
  • Hashtables for managed memory: GCHashtable, avmplus::Hashtable
  • Also avmplus::List
• ScreamingMonkey status: plugging away, nothing much to expect till after Christmas

Seo

• working on CIL decompiler, sent patches upstream
• exception issue from last week? no open issue
• DLR hosting spec, looks ok

Jason

• chasing down GC bugs, progressively better, still crashing -- more to do on js/src side
• js/src/xpconnect/tests/js/old/threads.js broke some time over the years, due most recently to thread manager API change
• after fixing that, still having problems with thread-unsafe xpcom objects finalized on wrong thread
• See the bug

Rick

• JIT intermediate buffers are not shared across threads
• each Tamarin instance has its own buffer => big footprint
• synch using GC spinlock
• Brendan: might want lock-free (SpiderMonkey portable CAS)