The h Bar

0celo7

18:01

Rob is in love with the meta chat

rob

→ 8 messages moved to Physics Meta

0celo7

I'm thinking new mods have to introduce a policy and that was his

rob

@0celo7 I'm easily distracted.

0celo7

@2017 I thought you were deleting your account?

2017

@0celo7 You thought it right.

Emilio Pisanty

18:07

I have officially lost my faith in humanity

there are collective nouns for pokemon

I

I can't even

0celo7

> A Patriarchy of Nidokings

PURPLE MALES AHHHH

@2017 but you canceled it or what?

2017

@0celo7 No.

I might

ACuriousMind

@EmilioPisanty I don't find that particularly strange. Are you new to the internet (or humans in general)? ;P

Emilio Pisanty

@ACuriousMind sigh

on the other hand, there's this

Sean Spicer Has a Nice Tie #JustAddZebras

►

Balarka Sen

chat's got stuff against jee

Bernardo Meurer

18:35

@BalarkaSen what's the best IIT?

Emilio Pisanty

yo @BernardoMeurer you know anything about qsub?

Balarka Sen

@Bernardo hell if I know

@0celo7 it's a cult man

Bernardo Meurer

@EmilioPisanty I don't even know what it is, sorry man :/

What is it?

Emilio Pisanty

@BernardoMeurer mainframe job queueing program

Bernardo Meurer

dartmouth.edu/~rc/HPC/man/qsub.html

Is this POSIX?

Emilio Pisanty

18:37

somehow if I gut my for loops so they take no time at all, it parallelizes fine

but if I put it all back in, it sends it to a single core

as far as I can tell

@BernardoMeurer har har

Bernardo Meurer

I know none of this, if I want parallel code I use C++ and OpenMP

Emilio Pisanty

the only form of documentation that's less helpful than manpages is a beautifully typeset LaTeX package docs

Bernardo Meurer

I'm too stupid to code pthreads

Hm? I find manpages pretty helpful :(

Emilio Pisanty

@BernardoMeurer yah, well, this was not my choice

Bernardo Meurer

They're just cryptic

@EmilioPisanty Whatcha trying to do exactly?

Emilio Pisanty

18:39

@BernardoMeurer cryptic == unhelpful

cryptic == not communicating correctly

Bernardo Meurer

Fair, it's bad comms

Emilio Pisanty

@BernardoMeurer submit a job via a bash script in a way that it will send each part of a bash for loop to a different core

Bernardo Meurer

Jesus

Hm

So, if the for loops have low complexity, it works

they all run on their own threads

but if they don't they get bundled in one thread?

Emilio Pisanty

@BernardoMeurer no, not quite

this is a bash script that handles a c++ .o file

all I'm changing is the executable

i.e. for-loops internal to the c++ file

0celo7

@ACuriousMind what does \le mean in the context of groups

Emilio Pisanty

18:43

but it somehow changes how it interacts with the queue manager

Bernardo Meurer

Ah

Hmmm

What's the metal this is running on? Is this x86_64?

ACuriousMind

@0celo7 Some use it for "is a subgroup of" (and a triangle instead of the < for "is a normal subgroup of")

Bernardo Meurer

What the hell

I got suspended just now

Emilio Pisanty

@BernardoMeurer I think so?

how do I check?

Bernardo Meurer

@EmilioPisanty Is this a UNIX-like OS?

Emilio Pisanty

18:45

@BernardoMeurer yes

Bernardo Meurer

uname -a

Emilio Pisanty

linux of some flavour

Linux hostname 2.6.32-431.20.3.el6.x86_64 #1 SMP Thu Jun 19 21:14:45 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

does appear to be x86_64

Bernardo Meurer

cat /proc/cpuinfo | grep "model name"

Emilio Pisanty

indeed it seems to be loudly insisting on it

2017

@BalarkaSen Hi! Could you solve the complex number problem ? :-)

Bernardo Meurer

18:46

See what that gives you

Emilio Pisanty

Intel(R) Xeon(R) CPU E5620 @ 2.40GHz

Bernardo Meurer

Bah

Emilio Pisanty

eight times

Bernardo Meurer

All seems fine

8 cores :)

@ACuriousMind Why did I get suspended for like a moment?

ACuriousMind

@BernardoMeurer I am investigating.

Bernardo Meurer

18:48

And my message complaining about proprietary software got removed lol

Emilio Pisanty

@BernardoMeurer 8*8 on the actual machine it's sending it to

Bernardo Meurer

This qsub is some obscure thing

Emilio Pisanty

@BernardoMeurer apparently it's quite popular for HPC management

Bernardo Meurer

I can't find who implements this

if it's GNU or some kernel-level shit

Emilio Pisanty

I'm pretty sure it's this one

Oracle Grid Engine

Oracle Grid Engine, previously known as Sun Grid Engine (SGE), CODINE (Computing in Distributed Networked Environments) or GRD (Global Resource Director), was a grid computing computer cluster software system (otherwise known as a batch-queuing system), acquired as part of a purchase of Terraspring, then improved and supported by Sun Microsystems and later Oracle. There have been open source versions and multiple commercial versions of this technology, initially from Sun, later from Oracle and then from Univa Corporation. This technology forked from the same codebase as HP's UDC, and IBM's eLiza...

Bernardo Meurer

18:50

It's Free Software, sweet!

Balarka Sen

@2017 Ahh, no. I thought a little but couldn't pan it out. I'll try it after the exams.

2017

@BalarkaSen Sure. Tell me if you need some hints ;)

Bernardo Meurer

I'm trying to think why would it be bundling together the instances

Balarka Sen

Will do.

Bernardo Meurer

Maybe if hyperthreading is on

2017

18:51

Try to approach it geometrically. Good luck for your exams though! @BalarkaSen

Emilio Pisanty

@BernardoMeurer Is there such a thing as Free Software under the care of Oracle?

Bernardo Meurer

hm

Christian

Hwy everyone, I have a quick question. Often times I see that multiplication in time domain is convolution in frequency domain and vice versa. However, sometimes I see a factor of (1/2pi) tagged on.

When does this happen?

Is it all the time?

Bernardo Meurer

@EmilioPisanty Only if it's old enough it had SISSL as it's license of choice

Christian

Or is it only when going from time to frequency, but not when going from frequency to time?

Emilio Pisanty

18:53

@Christian when normalization demands it

there's no convention that leaves everybody happy

you just need to check how everything is normalized

i.e. definitions for forward and backwards FT, and convolution

Bernardo Meurer

@EmilioPisanty I'm sorry, but I'm afraid I cannot help. My only guess would be Hyperthreading is doing something weird, but that's very unlikely. I wish I knew more about mainframes :/

Christian

hmm, that confuses me more. :/

Emilio Pisanty

and then an appropriate set of $2\pi$s will shake out onto the connections

@Christian see, here's the thing

is the FT $F(\omega) = \int f(t) e^{i\omega t}\mathrm dt$?

or is it $F(\omega) = \frac{1}{\sqrt{2\pi}}\int f(t) e^{i\omega t}\mathrm dt$?

@BernardoMeurer OK, so this is bizarre

it actually starts off on one core until that one is finished

and then it goes off to full-core mode

0celo7

@ACuriousMind I was suspended as well

Emilio Pisanty

so I guess the lighter executable wasn't changing the behaviour, it just means I breezing through the initial slow stage

@Christian if it's the latter, then the FT is self-inverse with that same normalization, i.e. $f(t) = \frac{1}{\sqrt{2\pi}}\int F(\omega) e^{-i\omega t}\mathrm d\omega$, with only a change in the sign of the exponent

if it's the former, the inverse FT sucks up the full normalization, $f(t) = \frac{1}{{2\pi}}\int F(\omega) e^{-i\omega t}\mathrm d\omega$

However, for a reasonable interpretation of the convolution, the second normalization is probably going to leave a constant in the convolution=FT(product of FTs) identity

so you'll always have awkward constants somewhere

and you just choose the convention that puts the awkward constants where you'll use them the least

so different people use different conventions

0celo7

19:02

@ACuriousMind Does "JEE is devil worshiping" violate the Be Nice Policy?

Balarka Sen

@2017 Thanks

@0celo7 Devil worshiping is totally nice man

0celo7

that's what I thought

I'm a Satanist

I don't see what's wrong with it

Balarka Sen

me too!

ACuriousMind

@0celo7 It is a weird thing to say but it's so oddly over the top I don't consider it actually offensive :P (which is why you are not finding yourself currently suspended; I said I'm investigating and can't say anything more)

0celo7

I'm not currently suspended, am I?

How could I be talking :P

ACuriousMind

19:05

> which is why you are not finding yourself currently suspended

0celo7

Did you edit that

ACuriousMind

No.

0celo7

You sly fox you

ACuriousMind

@EmilioPisanty Unless you set $2\pi = 1$ :P

Emilio Pisanty

@ACuriousMind that's preposterous

everybody knows that $2\pi=10$

Balarka Sen

19:07

$2\pi = \tau$

ACuriousMind

@EmilioPisanty Fair enough

Is 10 less awkward than $2\pi$?

How does one judge the awkwardness of a constant?

Emilio Pisanty

@BalarkaSen tau is such a terrible symbol for that

ACuriousMind

It should be $2\tau = \pi$

The $\pi$ looks like a tau with two legs if you squint :P

Balarka Sen

ah

0celo7

lol

Emilio Pisanty

19:09

three-legged pi is the best

Balarka Sen

can i make a centipede pi

and actively use it as a notation

Emilio Pisanty

@BalarkaSen ooooh, yes, please do

0celo7

or $\tau\!\tau\!\tau$

Emilio Pisanty

@0celo7 getcher spacings right

go big or go home

0celo7

$\tau\quad\tau\quad\tau$?

Emilio Pisanty

19:10

> According to Palais' own website, it seems that the macro \def \newpi{{\pi\mskip -7.8 mu \pi}} was used.

0celo7

The Palais?

Emilio Pisanty

dunno if it will work here

$\def \newpi{{\pi\mskip -7.8 mu \pi}}$ $\newpi$

dammit

I'll kill the latex defs

Balarka Sen

dick palais, @0celo7

0celo7

I dunno. If $2\pi$ confuses you that much maybe you're not cut out for STEM.

Balarka Sen

good topologist

0celo7

19:12

It's one of those intellectual bars that you have to overcome.

Ben Niehoff

what did @0celo7 say that's over the top? I can't find it

0celo7

I said that JEE is Devil worshiping.

The sentence doesn't even make sense. JEE is a test, Devil worshiping is a righteous action.

Balarka Sen

Yeah, probably too harsh

0celo7

I wouldn't go that far

Ben Niehoff

well, as long as JEE stays in its own room, that's cool

0celo7

19:14

JEE is not, which is the issue

the JEE is leaking out here

it's strictly off topic

Balarka Sen

What do you have against it man

Ben Niehoff

JEEhad

0celo7

OH MY GOD

Balarka Sen

I am gonna use and abuse that

Ben Niehoff

@BalarkaSen nothing, but I came here to socialize, not be asked about test questions

Balarka Sen

19:16

You can, like, hide posts of people

just sayin'

ACuriousMind

...wait, when did they change "ignore this user (everywhere)" to "hide posts"?

Balarka Sen

They didn't but you have both options available

ACuriousMind

Hmmm, I never saw the "hide posts" option before

But you're right, ignore is still there

0celo7

@ACuriousMind As it stands I can't take that unitary reps/ergodic theory class

Balarka Sen

hide posts is for when the posts are annoying

ignore is for when the user is annoying

0celo7

19:19

I have to take a stupid numerical methods class and I'm trying to get out of now

Ben Niehoff

having to click 20 times to hide a bunch of posts is pretty annoying

0celo7

Graduation requirements are the worst

Ben Niehoff

which is why the discussion should stay in its own room

ACuriousMind

@0celo7 :|

Balarka Sen

's fair

i never hide people a lot personally because i'm lazy

0celo7

19:19

@ACuriousMind At worst I just sit in the class. But if I'm not taking it, the prof has no reason to move the time

ACuriousMind

@2017 Stop flagging things that are not offensive.

0celo7

What the hell did I do now?

I'm not flagging anything

ACuriousMind

Sorry, wasn't meant to ping you.

0celo7

How do you hide individual posts?

Balarka Sen

sticky tape

on the monitor

Aaron Hall

19:21

what's with the flagging?

ACuriousMind

@BalarkaSen Unless no one posts anything more in the room, seems like a very temporary solution :P

0celo7

@ACuriousMind Thank you.

It seems some malicious person is hell-bent on flagging everything I say.

Balarka Sen

Don't see anything flag-worthy IMO

0celo7

And yet people validate the flags.

SE's chat flag system is stupidly broken.

Balarka Sen

nah, the issue is more that the community is not very united around these parts

but such is life

0celo7

19:26

It's 10k'ers from other sites that validate flags

2017

@ACuriousMind Never did.

I only flagged things that are offensive.

0celo7

There aren't any 10k'ers here who love JEE

Oh please

ACuriousMind

@2017 "JEEhad"? Seriously? That's a silly joke.

Aaron Hall

What's JEE?

ACuriousMind

@AaronHall See en.wikipedia.org/wiki/Joint_Entrance_Examination

0celo7

19:27

Some standardized test in India.

2017

@ACuriousMind "Jihad" isn't a very nice thing to joke about imo.

0celo7

@ACuriousMind Lol, was Ben flagged too?

@BenNiehoff You alive?

Balarka Sen

Jihad is a word that has many meanings, it need not be related to terrorist agenda.

@2017 In my humble opinion you shouldn't take everything against JEE too personally. I think most of the people here respects what you're interested in. The ones who doesn't care, well, laugh them off

0celo7

2

Balarka Sen

I personally think JEE stuff are nice

just too hard for me

ACuriousMind

19:29

@0celo7 ...why is your class being taught by a Sith Lord?

Ben Niehoff

I'm here

Aaron Hall

I'm not following any of this, so I'll catch you guys on the flip side...

Ben Niehoff

I'm not aware of having been flagged

0celo7

@ACuriousMind did Ben get flagged? Can you tell us?

@ACuriousMind he's a random dude, not the prof

ACuriousMind

@0celo7 I would tell everyone to let it go :)

rob

19:30

@0celo7 Tom Handler has ... changed ... since I was at UT.

0celo7

I would take a picture of the prof but he said taking pictures in class is grounds for failing the course

@rob handler is much fatter

Balarka Sen

@0celo7 the irony

Ben Niehoff

wow, when I was in undergrad, cameras were not so ubiquitous

0celo7

@BalarkaSen what's ironic about the picture?

Ben Niehoff

it never occurred to me that I might have to think about that, in the event that I'm lucky enough to become a prof someday

ACuriousMind

19:31

@BenNiehoff Did you have paper or did you still use wax tablets? ;)

Balarka Sen

@0celo7 that the hooded person really does look like a terrorist

0celo7

He has a cape on

Don't know if that's apparent from the picture

And a bundle of wooden swords

Ben Niehoff

@ACuriousMind I don't remember, I never took notes ;)

ACuriousMind

Ah, gotcha

0celo7

Btw it's super hot out

Ben Niehoff

19:33

I think for most of undergrad I didn't own a laptop

0celo7

Don't know how he survives

ACuriousMind

@0celo7 Then the question becomes: Why is your class not being taught by a Sith Lord :P

Ben Niehoff

and then maybe my last semester I got one of the early-generation machines that ran Windows XP Tablet Edition

0celo7

Because siths don't understand physics

Especially thermo

Vader got that lesson the hard way

Ben Niehoff

this was back before the iPad took over the word "tablet" and redefined it to be something useless

0celo7

19:34

Btw, no one noticed my tabs?

@BenNiehoff oh please

Ben Niehoff

I love poking fun at Apple people ;)

your tabs look atrocious

0celo7

I have everything in those tabs

Ben Niehoff

part of the reason I use Firefox is that it never shrinks the tabs like that, even if I have 200 open (which I do)

0celo7

Oh?

Ben Niehoff

nope

Balarka Sen

19:35

Yeah so annoying, that

0celo7

What does that look like

Balarka Sen

it scrolls

0celo7

That seems worse

Ben Niehoff

well, it shows about ten tabs across my screen, and they scroll

0celo7

I just open a new tab when I can't find the one I want

Ben Niehoff

19:36

but, you can also pull up a vertical list of them, with more complete titles, and scroll through that

0celo7

Works fine

Balarka Sen

@0celo I can see that

Ben Niehoff

but as far as poking fun at Apple, I found it hilarious when the iPad Pro was introduced as something revolutionary, when the technology (writing with digital ink on a screen) was literally 10 years old by that point

ACuriousMind

Why do you people have so many open tabs to begin with? I rarely get over a dozen

0celo7

Because you're an AI

Ben Niehoff

19:38

@ACuriousMind I don't use bookmarks

Riker

> checks tab count

ACuriousMind

@BenNiehoff ...what.

Ben Niehoff

and I keep opening papers that I mean to read, and never get around to

Riker

> 212 exactly

well then

@BenNiehoff same, generally the popups for typing the first bit of the website work for me

0celo7

If I bookmark something I'll never remember to look at it again

Ben Niehoff

19:39

@0celo7 yes, exactly!

0celo7

If the tab is open then I'll eventually see it again

Ben Niehoff

same as if I clean off my desk...can't find anything again

ACuriousMind

@BenNiehoff Those litter my download folder instead

0celo7

My coworker cleaned my desk over the break

I don't know where anything is now

@ACuriousMind ordner?

Balarka Sen

i'm gonna play the paperio game again

0celo7

19:40

Do you mean folder :P

Ben Niehoff

ah, I do occasionally clean up my Downloads folder

ACuriousMind

@0celo7 lol, sounded English enough that I didn't remember to translate it :D

Ben Niehoff

because my HD is only 256GB

0celo7

I have a TB

And 16GB memory

Ben Niehoff

well, SSD I should say

alas, my laptop is permanently sealed with glue and the parts are soldered in and un-upgradeable

but it's a pretty sweet machine aside from that

so 256 GB SDD and 8 GB RAM

Riker

19:42

@BenNiehoff mac?

Ben Niehoff

but I have an external 2 TB drive which I keep in my laptop bag, so it's not really a problem

no, it's a Surface Pro 4

0celo7

Wow how many movies do you have to need that much storage?

Ben Niehoff

I don't see the point of saving porn to disk

it's so easy to find

but, I do have a handful of Steam games which can be surprisingly big, I guess

and I do photography as a hobby, you'd be surprised how fast RAW files will fill your hard drive

0celo7

Freaking GTA5 is taking 70 of my gigabytes

I don't even play it

Ben Niehoff

I can't even install all of my games at once

currently only Skyrim is installed

but I haven't played it in a while

0celo7

19:47

Thermo prof: your choices are open or closed

Clearly not a topology student!

@BenNiehoff oh please

That's not a big feat

Just get a humble bundle and you need 256 GB for it

Ben Niehoff

I wasn't saying it was a big feat!

I'm saying I have so many photos in my photography folder that I don't have a lot of room left

0celo7

Right...photos.

I go back to my earlier comment.

Emilio Pisanty

@ACuriousMind that's pretty dull compared to the teaching spiderman

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