Tamarin:WeeklyUpdates: Difference between revisions

Tamarin:WeeklyUpdates (view source)

Revision as of 22:02, 15 April 2008

470 bytes removed , 15 April 2008

→‎15th April 2008

Sunterberg

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-= 25th March 2008 =
+= 15th April 2008 =
 == Attendees ==
-* Adobe: Edwin, Jennifer, Scott, Erik, Rick, Dan
+* Adobe: Ed, Jennifer, Scott, Rick, Steven
-* Mozilla: Graydon, Benjamin, Mark, Chris
+* Mozilla: Graydon, Brendan
-* Intel: Moh, Shengnan, Marsha, Karthik, Mingqui Sun
+* Intel: Moh, Shengnan, Karthik
 == Action Items ==
+* '''ACTION:''' Assign someone to create a patch for flag in AVM core
+*’’’ACTION:’’’ Jim from Mozilla to work with Moh on strings
+== Previous Action Items ==
 * '''ACTION:''' Edwin/Scott/or Jennifer to send out call for action items each Monday- these will be posted on the wiki
 * '''ACTION:''' Benjamin needs tom to review {{bug|423692}}
-* '''ACTION:''' Edwin: raise the priority of fixing string implementation -- The TT string optimization bug is https://bugzilla.mozilla.org/show_bug.cgi?id=411163
+* '''ACTION:''' Edwin: raise the priority of fixing string implementation -- The TT string optimization bug is https://bugzilla.mozilla.org/show_bug.cgi?id=411163 DONE
 * '''ACTION:''' Graydon: Per "callgrind" (call-graph profiler derived from "valgrind") - as hotspots are found, log bugs for them with profile data
-== Previous Action Items ==
-* '''ACTION:''' moh will look at GCbench test and suggest some optimizations. -- looked at memset and memcopy; optimizations are already in visual studio.  will look at other platforms.
-* '''ACTION:''' tom will see if he can find additional GC/memset tests to recommend to moh and post to test directory.  maybe GCheap?
-* '''ACTION:''' graydon will investigate Google "Summer of Code" agenda -- we're welcome to propose items to present.
 == Updates ==
-'''Edwin'''
+‘’’Moh’’’
-* working on trace trees
+* Working on performance opportunities w/ tracing. Have prototyped a routine for fast scanning of memory and skipping large blocks of zeros. This routine seems particularly useful for TT's ZCT::PinStackObjects hot loop on a number of benchmarks
-** main strategy is "pruning" so trees don't get so "bushy"
+**Is there any plan for major changes w/ garbage collection, etc., that would make these new changes irrelevant?
-* how do people feel about meeting twice a month, instead of every week?
+***Ed says that Garbage collector is stable and they will continue to want to look into this (could go into central as well)
-** moh suggests it would be better to keep weekly meeting on the calendars
+*A similar, but slightly different, pattern in the hot loop of _pcre_valid_utf8 also benefits from this optimization and results in 15% to 25% performance gain in Sunspider/string-unpack-code
-** edwin, scott, or jennifer will send out a call for agenda items on mondays
+*No person is yet assigned to strings, but Adobe/Mozilla will want to coordinate with Moh on this
-*** if there are hot topics, we'll meet. if not, we won't.
+**Jim from Mozilla will be working on this when he is back.
+*CPUID Instruction: Need a flag in AVM core: Ed thinks we should just create a patch and do it.  No one is assigned to this yet.
-'''Benjamin'''
-* ACTION: needs tom to review {{bug|423692}}
-'''Moh (Vtune)'''
-* vtune patch for central has been checked in
-** instructions are posted on tamarin wiki
-'''Karthik'''
-* been trying to profile sunspider benchmark
-** string-unpack provided an opportunity for optimization -- 4-5% improvement
-** other benchmarks seem a bit too small for profling (run for less than 1 second)
-* kathik will send patch to edwin, rick, or tom for review
-'''Mark'''
-* had been preparing for a conference, where discussed the future of mozilla and tamarin.
-** lots of excitement!
-** interest in ironmonkey
-* will be catching up with compiler updates soon
-'''Graydon'''
+'''Ed'''
-* has identified some more hotspots
+* ABC->Forth generation @runtime, preliminary #s.  Ed is working on change to tracking, working on Forth codebase.  Interpreter of ABC’s are compiled into IL.  This gives us a place to put static optimizations.  Thus, the interpreter runs faster as is only keeping track of one location and are optimizing the code before interpreting it.
-* submitted patch for {{bug|424891}} this week, which was more effective than all mini-tracing work so far.  wow!
+**Because of this, is working on code for managing the IL cache.  It’s a change in body plan for tamarin tracing
-* ACTION: edwin wants to raise the priority of fixing string implementation -- The TT string optimization bug is https://bugzilla.mozilla.org/show_bug.cgi?id=411163
+**Creates no real change to Forth language and is focused on single pass
-* steven is on vacation but interested in tracing
-* ACTION: Per "callgrind" (call-graph profiler derived from "valgrind") - as hotspots are found, log bugs for them with profile data
 = Older meetings =