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| kerio | DocScrutinizer05: what if i'm doing numerical analysis :< | 00:07 |
|---|---|---|
| kerio | well i don't use float32 | 00:07 |
| kerio | only poor people do that | 00:07 |
| DocScrutinizer05 | sorry, 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 equality | 00:10 |
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| kerio | well if you're doing any differential equation solving you want floats of some kind | 00:17 |
| kerio | and it's almost always doubles if you're running on a cpu or float32 if you're coding for a gpu | 00:17 |
| kerio | unless you're seriously constrained in space, or something | 00:18 |
| DocScrutinizer05 | so? | 00:18 |
| kerio | why would anyone actually use floats when dealing with ints, anyway? | 00:19 |
| DocScrutinizer05 | huh? | 00:19 |
| CatButts | a kind of a vague question | 00:20 |
| CatButts | but | 00:20 |
| CatButts | rough estimate, how much would be saved in heavy computations when using floats instead of doubles | 00:21 |
| DocScrutinizer05 | 355 | 00:21 |
| CatButts | I realize this answer depends on the CPU | 00:21 |
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| kerio | CatButts: you save on memory access | 00:22 |
| kerio | but you actually *add* overhead on the cpu | 00:22 |
| DocScrutinizer05 | and on the actual type of "heavy calculation" | 00:22 |
| kerio | unless you're doing vectorized operations perhaps | 00:22 |
| kerio | but modern CPUs will actually convert the floats to long doubles to operate on them, internally | 00:22 |
| DocScrutinizer05 | OMAP3 is no "modern CPU" | 00:23 |
| kerio | yeah i wonder how the FPU operates | 00:23 |
| DocScrutinizer05 | slow ;-) | 00:24 |
| DocScrutinizer05 | and energy hungry | 00:24 |
| kerio | apparently the FPU on the omap3 is optimized for single precision floats | 00:25 |
| ShadowJK | I guess it depends on whether you use vfp or neon.. I forget if omap3 has both, but I think it does? | 00:25 |
| kerio | ah yes | 00:25 |
| kerio | neon is fp32 | 00:25 |
| CatButts | where does Cortex A8 stand? | 00:25 |
| CatButts | oh | 00:26 |
| CatButts | >vf3 | 00:26 |
| CatButts | >vfp | 00:26 |
| CatButts | >vfp3 | 00:26 |
| ShadowJK | And in theory you're able to execute neon and regular arm in parallell, though they share the same decoder | 00:26 |
| CatButts | what if I just replace all the float/double math with int and bit magic | 00:27 |
| CatButts | hahahahahaha | 00:27 |
| kerio | i wonder what's going to be the first portable device with a nvidia pascal gpu | 00:35 |
| DocScrutinizer05 | then your calculations will speed up significantly | 00:35 |
| ShadowJK | a laptop, for certain definitions of "portable" | 00:35 |
| ShadowJK | Pascal will show up in tegra too eventually, though nobody is using Tegra for portable devices anymore | 00:35 |
| CatButts | so you're telling me to go ahead with replacing float math with int math and bit magic? | 00:35 |
| DocScrutinizer05 | hi ShadowJK, long time no see | 00:36 |
| ShadowJK | hello | 00:36 |
| kerio | i want a lappy with a desktop gtx 1080 :< | 00:36 |
| CatButts | uhllo | 00:36 |
| ShadowJK | I have a laptop with the equivalent of desktop gtx 970 | 00:36 |
| ShadowJK | (gtx 980m) | 00:36 |
| kerio | DocScrutinizer05: 7W when idling is totally fine right | 00:36 |
| ShadowJK | kerio, they made laptops with desktop gtx 980, so why not :) | 00:37 |
| DocScrutinizer05 | kerio: please don't ask me such questions that nobody can answer | 00:37 |
| kerio | ShadowJK: surely the equivalent of a desktop gtx 970 is a gtx 970 | 00:37 |
| kerio | which is a thing that they did put in laptops | 00:37 |
| DocScrutinizer05 | for a Boing 747 a 7W in idling are great | 00:37 |
| kerio | and it's only 173W average when on load | 00:38 |
| ShadowJK | My house idles at about 150W | 00:38 |
| DocScrutinizer05 | for your average car it's probably already on the heavy side | 00:38 |
| kerio | oh so slightly less than a gtx 1080 :D | 00:38 |
| kerio | surely we can fit a gtx 1080 in the neo900 somehow | 00:38 |
| DocScrutinizer05 | I'd rather try to fit 3 Neo900 into a GTX1080 | 00:39 |
| kerio | a gtx 1080 can probably emulate 3 neo900s | 00:39 |
| DocScrutinizer05 | not probably | 00:40 |
| kerio | well, gpus are pretty bad at normal computing stuff | 00:40 |
| DocScrutinizer05 | nope, that depends | 00:40 |
| kerio | and you've got a bunch of different processors running at different clock speeds | 00:40 |
| kerio | emulating a super nintendo *accurately* takes about 3ghz of a normal modern CPU :D | 00:40 |
| kerio | but yeah a gtx 1080 can probably bruteforce the shit out of an omap3 emulator and get out fine | 00:42 |
| DocScrutinizer05 | >>install base obviously<<? | 00:43 |
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| KotCzarny | kerio: even old thinkpads could take pcie card in a dock :P | 08:03 |
| KotCzarny | and there are generic external solutions too | 08:04 |
| KotCzarny | https://www.amazon.com/Laptop-External-PCI-Graphics-Card/dp/B00Q4VMLF6 | 08:06 |
| KotCzarny | he he | 08:06 |
| CatButts | >6 new from $62.00 | 08:07 |
| CatButts | >1 used from $119.99 | 08:07 |
| CatButts | discrepancy much? | 08:08 |
| KotCzarny | just an example, there are different takes on that, if your lappy has thunderbolt its better to use those | 08:08 |
| KotCzarny | i wonder how big em noise this thing would produce | 08:09 |
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| kerio | KotCzarny: the razer core actually charges the laptop and has an internal power supply | 09:26 |
| kerio | because usb C | 09:26 |
| KotCzarny | only if your laptop supports charging via usb | 09:36 |
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| kerio | usb c is amazing :3 | 09:47 |
| CatButts | keri-on, my wayward son | 09:56 |
| CatButts | there will be peace when you are done | 09:56 |
| CatButts | https://www.youtube.com/watch?v=9pS5xzOWbwo | 09:56 |
| CatButts | while I'm at it, might as well post https://www.youtube.com/watch?v=baExq6xNhQ8 | 10:03 |
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| Defiant | hmm strange. Just soldered the usb connect tor the n900. The connecttor is fine, so are the connections on the mainboard it seems. Jet charging failed | 10:59 |
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| Oksanaa | gucharmap 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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