IRC log of #maemo for Saturday, 2016-07-23

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kerioDocScrutinizer05: what if i'm doing numerical analysis :<00:07
keriowell i don't use float3200:07
kerioonly poor people do that00:07
DocScrutinizer05sorry, I can't take you serious. You got to know what datatype you need for which problem to solve. I just can say that floats of all kinds more often than not are used out of mere laziness or incompetence, and then impose a massive workload on CPU/FPU for no reason, while same time usually even introducing errors to your algo since many coders don't grok that you never compare floats for equality00:10
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keriowell if you're doing any differential equation solving you want floats of some kind00:17
kerioand it's almost always doubles if you're running on a cpu or float32 if you're coding for a gpu00:17
keriounless you're seriously constrained in space, or something00:18
keriowhy would anyone actually use floats when dealing with ints, anyway?00:19
CatButtsa kind of a vague question00:20
CatButtsrough estimate, how much would be saved in heavy computations when using floats instead of doubles00:21
CatButtsI realize this answer depends on the CPU00:21
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kerioCatButts: you save on memory access00:22
keriobut you actually *add* overhead on the cpu00:22
DocScrutinizer05and on the actual type of "heavy calculation"00:22
keriounless you're doing vectorized operations perhaps00:22
keriobut modern CPUs will actually convert the floats to long doubles to operate on them, internally00:22
DocScrutinizer05OMAP3 is no "modern CPU"00:23
kerioyeah i wonder how the FPU operates00:23
DocScrutinizer05slow ;-)00:24
DocScrutinizer05and energy hungry00:24
kerioapparently the FPU on the omap3 is optimized for single precision floats00:25
ShadowJKI guess it depends on whether you use vfp or neon.. I forget if omap3 has both, but I think it does?00:25
kerioah yes00:25
kerioneon is fp3200:25
CatButtswhere does Cortex A8 stand?00:25
ShadowJKAnd in theory you're able to execute neon and regular arm in parallell, though they share the same decoder00:26
CatButtswhat if I just replace all the float/double math with int and bit magic00:27
kerioi wonder what's going to be the first portable device with a nvidia pascal gpu00:35
DocScrutinizer05then your calculations will speed up significantly00:35
ShadowJKa laptop, for certain definitions of "portable"00:35
ShadowJKPascal will show up in tegra too eventually, though nobody is using Tegra for portable devices anymore00:35
CatButtsso you're telling me to go ahead with replacing float math with int math and bit magic?00:35
DocScrutinizer05hi ShadowJK, long time no see00:36
kerioi want a lappy with a desktop gtx 1080 :<00:36
ShadowJKI have a laptop with the equivalent of desktop gtx 97000:36
ShadowJK(gtx 980m)00:36
kerioDocScrutinizer05: 7W when idling is totally fine right00:36
ShadowJKkerio, they made laptops with desktop gtx 980, so why not :)00:37
DocScrutinizer05kerio: please don't ask me such questions that nobody can answer00:37
kerioShadowJK: surely the equivalent of a desktop gtx 970 is a gtx 97000:37
keriowhich is a thing that they did put in laptops00:37
DocScrutinizer05for a Boing 747 a 7W in idling are great00:37
kerioand it's only 173W average when on load00:38
ShadowJKMy house idles at about 150W00:38
DocScrutinizer05for your average car it's probably already on the heavy side00:38
keriooh so slightly less than a gtx 1080 :D00:38
keriosurely we can fit a gtx 1080 in the neo900 somehow00:38
DocScrutinizer05I'd rather try to fit 3 Neo900 into a GTX108000:39
kerioa gtx 1080 can probably emulate 3 neo900s00:39
DocScrutinizer05not probably00:40
keriowell, gpus are pretty bad at normal computing stuff00:40
DocScrutinizer05nope, that depends00:40
kerioand you've got a bunch of different processors running at different clock speeds00:40
kerioemulating a super nintendo *accurately* takes about 3ghz of a normal modern CPU :D00:40
keriobut yeah a gtx 1080 can probably bruteforce the shit out of an omap3 emulator and get out fine00:42
DocScrutinizer05>>install base obviously<<?00:43
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KotCzarnykerio: even old thinkpads could take pcie card in a dock :P08:03
KotCzarnyand there are generic external solutions too08:04
KotCzarnyhe he08:06
CatButts>6 new from $62.0008:07
CatButts>1 used from $119.9908:07
CatButtsdiscrepancy much?08:08
KotCzarnyjust an example, there are different takes on that, if your lappy has thunderbolt its better to use those08:08
KotCzarnyi wonder how big em noise this thing would produce08:09
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kerioKotCzarny: the razer core actually charges the laptop and has an internal power supply09:26
keriobecause usb C09:26
KotCzarnyonly if your laptop supports charging via usb09:36
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keriousb c is amazing :309:47
CatButtskeri-on, my wayward son09:56
CatButtsthere will be peace when you are done09:56
CatButtswhile I'm at it, might as well post
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Defianthmm strange. Just soldered the usb connect tor the n900. The connecttor is fine, so are the connections on the mainboard it seems. Jet charging failed10:59
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Oksanaagucharmap should be maemonised. Probably, forked... First, moving desktop shortcut. Second, making menu smaller: file->close is redundant, help->contents is useless, find->next and find->previous are redundant as well. And where is icon?..17:25
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