Totally agree that 1% is probably still too much to drop, but the 4x drop over the past two years makes me hopeful that we'll be able to drop non-SSE2, eventually.
SSE2 is not just about SIMD. The most important thing it buys us IMHO is to be able to not use x87 instructions anymore and instead use SSE2 (scalar) instructions. That removes entire classes of bugs caused by x87 being non-IEEE754-compliant with its crazy 80-bit registers. Benoit 2014-05-09 13:01 GMT-04:00 Chris Peterson <cpeter...@mozilla.com>: > What does requiring SSE2 buy us? 1% of hundreds of millions of Firefox > users is still millions of people. > > chris > > > > On 5/8/14, 5:42 PM, matthew.br...@gmail.com wrote: > >> On Tuesday, January 3, 2012 4:37:53 PM UTC-8, Benoit Jacob wrote: >> >>> 2012/1/3 Jeff Muizelaar <jmuizel...@mozilla.com>: >>> >>> >>>> >>> On 2012-01-03, at 2:01 PM, Benoit Jacob wrote: >>>> >>> >>> >>>> >>> 2012/1/2 Robert Kaiser <ka...@kairo.at>: >>>> >>> >>> >>>> >>> Jean-Marc Desperrier schrieb: >>>> >>> >>> >>>> >>> >>>> >>> According to https://bugzilla.mozilla.org/show_bug.cgi?id=594160#c6 , >>>> >>> >>> >>>> >>> the Raw Dump tab on crash-stats.mozilla.com shows the needed >>>> >>> >>> >>>> >>> information, you need to sort out from the info on the second line CPU >>>> >>> >>> >>>> >>> maker, family, model, and stepping information whether SSE2 is there or >>>> >>> >>> >>>> >>> not (With a little search, I can find that info again, bug 593117 gives >>>> >>> >>> >>>> >>> a formula that's correct for most of the cases). >>>> >>> >>> >>>> >>> >>>> >>> >>>> >>> https://crash-analysis.mozilla.com/crash_analysis/ holds >>>> >>> >>> >>>> >>> *-pub-crashdata.csv.gz files that have that info from all Firefox >>>> >>> >>> >>>> >>> desktop/mobile crashes on a given day, you should be able to analyze >>>> that >>>> >>> >>> >>>> >>> for this info - with a bias, of course, as it's only people having >>>> crashes >>>> >>> >>> >>>> >>> that you see there. No idea if the less biased telemetry samples have >>>> that >>>> >>> >>> >>>> >>> info as well. >>>> >>> >>> >>>> >>> >>>> >>> On yesterday's crash data, assuming that AuthenticAMD\ family\ >>>> >>> >>> [1-6][^0-9] is the proper way to identify these old AMD CPUs (I >>>> >>> >>> didn't check that very well), I get these results: >>>> >>> >>> >>>> >>> >>>> >>> The measurement I have used in the past was: >>>> >>> >>> >>>> >>> CPUs have sse2 if: >>>> >>> >>> >>>> >>> if vendor == AuthenticAMD and family >= 15 >>>> >>> >>> if vendor == GenuineIntel and family >= 15 or (family == 6 and (model >>>> == 9 >>>> >>> >>> or model > 11)) >>>> >>> >>> if vendor == CentaurHauls and family >= 6 and model >= 10 >>>> >>> >>> >>>> >>> >>> >>> Thanks. >>> >>> >>> >>> AMD and Intel CPUs amount to 296362 crashes: >>> >>> >>> >>> bjacob@cahouette:~$ egrep AuthenticAMD\|GenuineIntel >>> >>> 20120102-pub-crashdata.csv | wc -l >>> >>> 296362 >>> >>> >>> >>> Counting SSE2-capable CPUs: >>> >>> >>> >>> bjacob@cahouette:~$ egrep GenuineIntel\ family\ 1[5-9] >>> >>> 20120102-pub-crashdata.csv | wc -l >>> >>> 58490 >>> >>> bjacob@cahouette:~$ egrep GenuineIntel\ family\ [2-9][0-9] >>> >>> 20120102-pub-crashdata.csv | wc -l >>> >>> 0 >>> >>> bjacob@cahouette:~$ egrep GenuineIntel\ family\ 6\ model\ 9 >>> >>> 20120102-pub-crashdata.csv | wc -l >>> >>> 792 >>> >>> bjacob@cahouette:~$ egrep GenuineIntel\ family\ 6\ model\ 1[2-9] >>> >>> 20120102-pub-crashdata.csv | wc -l >>> >>> 52473 >>> >>> bjacob@cahouette:~$ egrep GenuineIntel\ family\ 6\ model\ [2-9][0-9] >>> >>> 20120102-pub-crashdata.csv | wc -l >>> >>> 103655 >>> >>> bjacob@cahouette:~$ egrep AuthenticAMD\ family\ 1[5-9] >>> >>> 20120102-pub-crashdata.csv | wc -l >>> >>> 59463 >>> >>> bjacob@cahouette:~$ egrep AuthenticAMD\ family\ [2-9][0-9] >>> >>> 20120102-pub-crashdata.csv | wc -l >>> >>> 8120 >>> >>> >>> >>> Total SSE2 capable CPUs: >>> >>> >>> >>> 58490 + 792 + 52473 + 103655 + 59463 + 8120 = 282993 >>> >>> >>> >>> 1 - 282993 / 296362 = 0.045 >>> >>> >>> >>> So the proportion of non-SSE2-capable CPUs among crash reports is 4.5 %. >>> >> >> Just for the record, I coded this analysis up here: >> https://gist.github.com/matthew-brett/9cb5274f7451a3eb8fc0 >> >> SSE2 apparently now at about one percent: >> >> 20120102-pub-crashdata.csv.gz: 4.53 >> 20120401-pub-crashdata.csv.gz: 4.24 >> 20120701-pub-crashdata.csv.gz: 2.77 >> 20121001-pub-crashdata.csv.gz: 2.83 >> 20130101-pub-crashdata.csv.gz: 2.66 >> 20130401-pub-crashdata.csv.gz: 2.59 >> 20130701-pub-crashdata.csv.gz: 2.20 >> 20131001-pub-crashdata.csv.gz: 1.92 >> 20140101-pub-crashdata.csv.gz: 1.86 >> 20140401-pub-crashdata.csv.gz: 1.12 >> >> Cheers, >> >> Matthew >> >> > _______________________________________________ > dev-platform mailing list > dev-platform@lists.mozilla.org > https://lists.mozilla.org/listinfo/dev-platform > _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
