On Fri, May 9, 2014 at 10:14 AM, Benoit Jacob <jacob.benoi...@gmail.com>wrote:
> 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. > Out of interest, do you have links to bugs for this issue? Also, can't you ask the compiler to produce both sse and non-sse code and make a decision at runtime? > 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 > _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
