asciilifeform: let the WRITER pad.

asciilifeform: read 77 bytes ? write 77, motherfucker

asciilifeform: could just the same do this without the padding.

asciilifeform: 'new jersey philosophy' : 'silent failure is just about as good as success'

asciilifeform: it inserts 0 silently in place of what failed to read.

asciilifeform: except that the idiocy in question doesn't preserve any data.

asciilifeform: bbbbutthatwouldntbePOSIX!111

asciilifeform: if you omit the 'h', you get output in martian units

asciilifeform: ^ that one is at least plain to naked eye

asciilifeform: doppler: once you figure out this puzzler, you will grasp what the thread was about

asciilifeform: and laugh/cry

asciilifeform: then ls -l out

asciilifeform: yes | dd of=out bs=1024k count=10 ☟︎

asciilifeform: btw, here's a lulzy:

asciilifeform: THAT very same SCO.

asciilifeform: the 'standard' in question is actually quasi-mythological work, and (yes) SCO's.

asciilifeform: 2001.

asciilifeform: http://pubs.opengroup.org/onlinepubs/9699919799/utilities/dd.html

asciilifeform: mircea_popescu: nope

asciilifeform: mircea_popescu: ' i only implemented the standard ' has roughly same cachet as ' i was only following orders!11'

asciilifeform: ( spoiler : plan9's is the 'correct' one )

asciilifeform: ^ we had this on 2+ threads

asciilifeform: on 'modern unix'.

asciilifeform: nooseflash: even, e.g., 'cat', has megatonne of liquishit.

asciilifeform: aaaha.

asciilifeform: barfalicious.

asciilifeform: why the FUCK would anyone specify 'count ATTEMPTS' rather than reads !

asciilifeform: Framedragger: picture if 'this util will format your hdd unless you supply the iflag=dontformatmyhdd option' buried somewhere deep in docs.

asciilifeform: Framedragger: almost like somebody thought about rng.

asciilifeform: 'unix philosophy' my arse.

asciilifeform: but apparently doesn't like kB/s variable thing.

asciilifeform: mircea_popescu: e.g., dd, worx 100% of the time when copying multi-TB ssd, say.

asciilifeform: http://nosuchlabs.com/hardware.html has been updated.

asciilifeform: mircea_popescu: apparently everything is 'fine' until you find the magic corner case.

asciilifeform: ikr?

asciilifeform: ^ mircea_popescu, mod6 , ben_vulpes , everybody ^

asciilifeform: holy FUCK the sheer gangrene.

asciilifeform: 'oh i'ma pad with zeros'

asciilifeform: on what planet was this considered acceptable?!!!

asciilifeform: MOTHERFUCKERS

asciilifeform: the cure, apparently, is option ' iflag=fullblock ' which for some reason is NOT DEFAULT

asciilifeform: apparently, when reading slow or variable-speed source ( such as FUCKGOATS ) dd will sometimes fail to fill an entire block (default block size is 512 on most boxes) and PAD WITH MOTHERFUCKING ZEROS

asciilifeform: of the worst sort, the 'folx in the know, know about it, and it will never be fixed'

asciilifeform: i may have found a bug in dd.

asciilifeform: in other noose!

asciilifeform: put'em on an old hdd.

asciilifeform: i quite often refer to the raw blox.

asciilifeform: handy for experiments and what-ifs of many sorts.

asciilifeform: they are quite handy.

asciilifeform: mod6: i recommend to keep'em around

asciilifeform: anyway this is not essential.

asciilifeform: then where the shutdown routine is, print it.

asciilifeform: and dbTotal += res ; say, after the print.

asciilifeform: int64 dbTotal = 0; somewhere,

asciilifeform: make a, e.g.,

asciilifeform: so we find out total % of the node's bringup time spent waiting for bdb

asciilifeform: (optional) make it print total odometers on shutdown

asciilifeform: one more thing

asciilifeform: mod6: you need asciilifeform_blackhole_odometer.vpatch + above, aha.

asciilifeform: roughly.

asciilifeform: also fwiw his total block delays (red) match the ones on my ssd node (zoolag)

asciilifeform: mircea_popescu: that's what mod6 was doing. except that he forgot the 'read' patch ^ and only had total and write.

asciilifeform: http://therealbitcoin.org/ml/btc-dev/attachments/20170226/asciilifeform_blackhole_reads.vpatch

asciilifeform: aha!

asciilifeform: i posted a bunch of these.

asciilifeform: ProcessBlock (res == 1) took : 167839ms; db write wait: 130117ms; db read wait: 21201ms

asciilifeform: e.g.,

asciilifeform: thread is in the logs.

asciilifeform: and i instrumented it.

asciilifeform: there's exactly 1 segment that accounted for ~99% of time.

asciilifeform: omfg

asciilifeform: mircea_popescu: i DID THIS

asciilifeform: ( the overall db wait time is ~= the total )

asciilifeform: mod6: also legend oughta read 'db write wait time'

asciilifeform: mod6: can haz one moar plot -- just 300,000 and up, plox ?

asciilifeform: 'we'

asciilifeform: eventually (given the extant turdball) it'll be >10min, and party's over.

asciilifeform: you can trivially derive the fact of it being not at all linear.

asciilifeform: aha.

asciilifeform: mircea_popescu: didn't i tellya it'll be geometric ?

asciilifeform: ( folx playing with mining 'db-pessimized' blocks... ? )

asciilifeform: 'stress tests' ?

asciilifeform: gotta wonder, what happened in the spikes

asciilifeform catches up with l0gz

asciilifeform: lol

asciilifeform: looks like mod6 already has

asciilifeform: oh nm

asciilifeform: ( the one i used for the plots )

asciilifeform: mod6: see ye olde http://therealbitcoin.org/ml/btc-dev/2015-July/000107.html << there is a pythong and gp script in there

asciilifeform: anything else -- waste of time

asciilifeform: strictly.

asciilifeform: http://btcbase.org/log/2017-04-18#1645539 << gnuplot ☝︎

asciilifeform: mats: if you're an aficionado, you'll like http://btcbase.org/log/2014-06-22#728931 ☝︎

asciilifeform: 'The man accused of fatally shooting five people in a Washington state mall last year has been found dead in his jail cell, authorities said Monday. ... When police confronted the suspect, he froze and complied ... was unarmed and silent, "kind of zombie-like," ... emigrated from Turkey and was a legal permanent resident'

asciilifeform: https://archive.is/ts6e4 << in other manchurian candidates.

asciilifeform: the one in http://qntra.net/2017/04/easter-manhunt-in-us .

asciilifeform: some d00d

asciilifeform: PA state police.

asciilifeform: in other noose, 'Steve Stephens was spotted this morning by PSP members in Erie County. After a brief pursuit, Stephens shot and killed himself.' -- re: recent desperado

asciilifeform: and be unaffected by local liquishit.