Tamarin:WeeklyUpdates: Difference between revisions

Tamarin:WeeklyUpdates (view source)

Revision as of 21:56, 6 May 2008

113 bytes removed , 6 May 2008

→‎6th May 2008

Sunterberg

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-= 15th April 2008 =
+= 6th May 2008 =
 == Attendees ==
-* Adobe: Ed, Jennifer, Scott, Rick, Steven
+* Adobe: Ed, Scott, Rick, Steven, Tom
-* Mozilla: Graydon, Brendan
+* Mozilla: Dave, Jason, Jim
-* Intel: Moh, Shengnan, Karthik
+* Intel: Shengnan Cong, Marsha Eng, Jungwoo Ha, Moh Haghighat, Mingqiu Sun
-== Action Items ==
+== Updates ==
-*'''ACTION:''' Assign someone to create a patch for flag in AVM core
+** Moh (Intel)-
-*'''ACTION:''' Jim from Mozilla to work with Moh on strings
+*** Major performance gains from optimized doubleToInt32 (double d) using integer code. https://bugzilla.mozilla.org/show_bug.cgi?id=412978
+**** This is used in SpiderMonkey and Tamarin.  Intel’s numeric team has helped out with this issue. Great performance gains thus far- Ed has also gotten these consistent results
+***** Mozilla to see how this works with Firefox
+*** CMOV is no longer considered harmful!
+**** A discussion on the performance considerations of using CMOV. Intel recommends using CMOV except in certain highly predictable cases.
+***** Now it needs to be tested!
-== Previous Action Items ==
+** Steven (Adobe)-
+*** Working on a patch for an interpreter speed-up. Currently is only working on Mac. Patch should be viewable later today.
+**** Progress is being made!
-* '''ACTION:''' Benjamin needs tom to review {{bug|423692}}
+** Rick (Adobe)-
-* '''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
+*** Is continuing to work on trees.  Expects to land patch soon and go over updates in the next few weeks.
-* '''ACTION:''' Graydon: Per "callgrind" (call-graph profiler derived from "valgrind") - as hotspots are found, log bugs for them with profile data
-== Updates ==
-'''Moh'''
+** Jim (Mozilla)-
-* 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
+*** Update on regression of performance.  In order for Tamarin to get into Mozilla, then patches can’t land if they slow things down.  Take a benchmark approach and get TT to be on par w/ SpiderMonkey- then it can be switched over.
-**Is there any plan for major changes w/ garbage collection, etc., that would make these new changes irrelevant?
+**** Mozilla will contribute speed optimizations to Adobe.  Adobe needs to be comfortable making optimized code “clean” going forward, while making sure the numbers hit.
-***Ed says that Garbage collector is stable and they will continue to want to look into this (could go into central as well)
+***** Adobe is building out its own internal performance measurements now. Going forward, make sure Mozilla and Adobe have agreement on benchmarks.
-*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
-*No person is yet assigned to strings, but Adobe/Mozilla will want to coordinate with Moh on this
-**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.
+** Tom (Adobe)-
+*** Has posted a wiki page on Hosting APIs that he wants Mozilla to review.  He will also send around to the list.
-'''Ed'''
+** Mark Hammond-
-* 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.
+*** How to best evangelize Tamarin through ScreamingMonkey? How to get folks using it?
-**Because of this, is working on code for managing the IL cache.  It’s a change in body plan for tamarin tracing
+**** The IE DOM works as hopes (minus some expected issues).  Can we evangelize and package?  Yes, but who can assist? John R and other evangelists can blog on this. Brendan to follow-up with Mark on this.
-**Creates no real change to Forth language and is focused on single pass
 = Older meetings =