Logs for #trilema

Go to: #trilema #pizarro #asciilifeform #trilema-mod6 #chainstate #eulora

2019-1-9 | 2019-1-11

mircea_popescu: client went through two major and a bunch of minor versions.
mircea_popescu: was a point in iirc 2015 when it was "get new client or can't connect"
mircea_popescu: nicoleci http://p.bvulpes.com/pastes/VAX51/?raw=true
asciilifeform: in other noose, asciilifeform made the unhappy discovery that shift-by-zero takes fewer cpu cycles on pretty much all x86 iron vs shift-by-1 .
asciilifeform: this means not only slightly slower gcd than the draft posted earlier (it'll need a mux) but it also means that e.g. http://www.loper-os.org/pub/ffa/hypertext/ch14/fz_qshft__adb.htm#111_14 was in fact leaking, albeit undetectable on the tests given in ch14, and will need mandatory HaveBarrelShifter = 0 (i.e. 5% or so penalty)
asciilifeform: ( and before anyone asks -- neither intel nor amd publish 'tick tables' the way they did in 1990s, and haven't for many yrs )
asciilifeform: this appears to be the kind of boobytrap that can only be found empirically.
feedbot: http://qntra.net/2019/01/systemd-journald-exploits-found-all-systemd-distros-affected/ << Qntra -- Systemd Journald Exploits Found All Systemd Distros Affected
asciilifeform found the shift booby by generating ridiculously long random inputs, with variety of hamming weight ranges, and plain old wallclock
lobbes: !Xview 1035
auctionbot: Buy order # 1035: 1500 Filthy Fiats, Wired, WU, or Moneygram Opened at: 400mn ecu Winning Bid: None [Closed]
lobbes: auctionbot was down for ~9 hours today (back online now). I'm going to give a 100 ecu per auction hour credit to everyone who had auctions going during this downtime, since no one could put in bids during that time and I don't wanna charge fees for those hours. Thinking I'll make this standard policy going forward
asciilifeform set up an experiment with variants of http://p.bvulpes.com/pastes/RMcd3/?raw=true ; will report re same tomorrow
asciilifeform let it go on 2 diff opterons and 2 intels
asciilifeform: hm , prolly oughta test both left and right, and make the operand nonzero (in case the iron does 'clever' with zeros), so gotta redo..
asciilifeform: http://p.bvulpes.com/pastes/7zNhD/?raw=true << the final ver., for the record.
mircea_popescu: and today being january, let us celebrate the SECOND year yossi kreinin failed to engage the utter destruction of his inept nonsense found in http://trilema.com/2017/my-ai-problems-a-humble-confession/
mircea_popescu: because hey, this is optional now, yossik is at liberty to redress his stupidity or not as he well pleases, there's no obligation my intellectual superiority creates for him or anything.
asciilifeform: mircea_popescu: hm what made you remember that d00d existed ?
mircea_popescu: coincidentally dug up article for inquiring young minds.
billymg: hanbot: thanks for checking it out, i'll take a look at the "no newline" issue and see if i can get rid of it
billymg: i also noticed that the selection-magic.txt (which is to be renamed to selection-magic.php) ( http://trilema.com/wp-content/uploads/2015/05/selection-magic.txt ) contains comments at the top marked with // that are not parsed as comments because they're outside the <script> block
billymg: updated in my copy to wrap in <!-- -->
billymg: wondering about proper V process though, this is back in the previous patch i published to add the text selection feature, does this mean regrind both?
billymg: i mean, the second needs it now in any case for the "no newline" spew, but had that one been fine, what would've been preferred for remedying the one before it?
mircea_popescu: billymg can just put a patch atop your tree.
billymg: sounds good
mircea_popescu: hey Mocky : i need a buncha noob clicks done in eulora ; can you spend a coupla hours one of these days ?
asciilifeform: http://btcbase.org/log/2019-01-10#1886234 << update : the 1e11-shot ver. reveals no significant avg. delta; rerunning overnight with 1e12.
a111: Logged on 2019-01-10 01:52 asciilifeform: hm , prolly oughta test both left and right, and make the operand nonzero (in case the iron does 'clever' with zeros), so gotta redo..
asciilifeform: btw the thing that set asciilifeform's ears standing originally, is that the gcd test battery appeared to give +/- 30% variant runtimes depending on hamming weights. but in 20 repeats of the trial set, the same thing showed up, and with no correlation to hamming weight. and a http://p.bvulpes.com/pastes/wherN/?raw=true ( soft barrelshifter ) version now ends up showing... same thing. i suspect that some peculiarity of the pipeline is
asciilifeform: involved (i.e. interaction with other crapola running on the box) to produce random variance
asciilifeform: thing is, this effect does not appear with e..g modexp, so i gotta find out where it comes from
asciilifeform bbl,meat
Mocky: mircea_popescu sure, no problem. I'll fire it up tomorrow, make sure I'm good to go.
mircea_popescu: i was thinking more the weekend ?
Mocky: weekend works
asciilifeform: meanwhile, anticlimactic finish to last night's item -- no detectable pattern in shift timing, anywhere
asciilifeform: and the orig. anomaly disappears on irons other than the test box
asciilifeform: i suspect my hdd
asciilifeform: (the test inputs are ~100MB ea.)
asciilifeform: aaand to round off : it vanished on the test box also. culprit appears to have been a running raid-verify job...
mircea_popescu: keks.
asciilifeform: ikr?
mircea_popescu: BAD TESTER ALF!
asciilifeform: the ultimate tester would be a dos box
asciilifeform: sorta 90% of the reason i want a dos gnat
mircea_popescu: not bad yea
asciilifeform: errywhere else there's a massive noise component
asciilifeform: some time after i get ffa to field testing , i'ma dust off ave1's bare iron gnat and bake 'ffa os', will be ~same thing
asciilifeform: ( it dun use any osisms other than the cmdline args, which can be hardcoded for test runs; as for i/o, can be rs232, and guesswat, 'os' )
asciilifeform: ( recall that ffa dun use memory allocators , disk, etc )
mircea_popescu: this is an idea.
asciilifeform: pretty sure i mentioned it in the l0gz, it is old idea
asciilifeform: but evidently moar needed than i prev. thought
feedbot: http://qntra.net/2019/01/el-chapo-allegedly-used-voip-had-sysadmin-flipped-by-criminal-fbi/ << Qntra -- "El Chapo" Allegedly Used VOIP, Had Sysadmin Flipped By Criminal FBI
feedbot: http://qntra.net/2019/01/as-yellow-jackets-continue-undermining-macron-despot-to-sign-treaty-futher-eroding-separation-between-france-and-germany/ << Qntra -- As Yellow Jackets Continue Undermining Macron, Despot To Sign Treaty Futher Eroding Separation Between France And Germany
BingoBoingo: ^ Turns out Germany's solution to gutting their Army is taking France's
BingoBoingo: Meanwhile in local news (local enough asciilifeform walked by the location in question) https://www.elobservador.com.uy/nota/toma-de-rehen-en-una-peluqueria-de-pocitos-obligo-a-sitiar-la-zona-2019110143314
BingoBoingo: And the local mooing about the incident for those desiring to calibrate their prisms http://archive.is/uY9xD
feedbot: http://www.loper-os.org/?p=2963 << Loper OS -- Finite Field Arithmetic. Chapter 15: Greatest Common Divisor.
asciilifeform: ^ mircea_popescu , diana_coman , et al ^
asciilifeform: phf plox to snarf ch15.
asciilifeform: next ch, will be m-r.

2019-1-9 | 2019-1-11