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Alex2 Send message Joined: 2 Nov 12 Posts: 24 Credit: 11,798,226 RAC: 0 |
Thanks! I completed my first 2 tasks. - The first problem I could see is over estimate the completion time: It estimated at first 60h but it was done in 16h (CPU time?) (30h real time) on ARM7@1.6ghz. - The second problem is that it trigger more often the thermal protection that half the CPU frequency, 1600mhz to 1000mhz on my custom kernel than other NativeBoinc apps. Also the dramatic difference between the credit earning from SETI to Milky have been confirmed. See my previous post. I'll appreciate if someone could direct me to an explanation or just more info on that subject. |
HAL9000 Send message Joined: 11 Sep 99 Posts: 6534 Credit: 196,805,888 RAC: 57 |
Well, the first four wu's have been reported and one validated so far. The power saving option got me the first time I ran PrimeGrid or Milkyway with it. When unchecked it says Power Saving: Prevent screen lock & CPU underclocking. So I thought "Yeah I want to do that". However when checked it changes to Power Saving: Allow screen lock and CPU underclocking. It does make sense. Power Save checked = on & unchecked = off. Just threw me off by not reading what it was telling me. SETI@home classic workunits: 93,865 CPU time: 863,447 hours Join the [url=http://tinyurl.com/8y46zvu]BP6/VP6 User Group[ |
HAL9000 Send message Joined: 11 Sep 99 Posts: 6534 Credit: 196,805,888 RAC: 57 |
Thanks! BOINC overestimates completion times by a large margin at first intentionally. I think it is after ~10 completed tasks the estimates will be close to actual or something along those lines. SETI@Home uses CreditNew. Which is the recent credit system the BOINC developers created. As far as I know SETI@Home is the only project that uses it. Also other projects can more or less "pay" however much credit they would like per flop. Some projects give large amounts of credit as a way to attract users I suppose. SETI@home classic workunits: 93,865 CPU time: 863,447 hours Join the [url=http://tinyurl.com/8y46zvu]BP6/VP6 User Group[ |
Raistmer Send message Joined: 16 Jun 01 Posts: 6325 Credit: 106,370,077 RAC: 121 |
I would say it's sign of code quality still had to be reached on other projects. CPU used fully hence higher temps. Only truly optimized stuff can overheat ;) So I would not label this as problem. It's issue with device cooling perhaps. Also, faster code can be made slower (and reverse much harder to reach). You just need some CPU throttling. SETI apps news We're not gonna fight them. We're gonna transcend them. |
Alex2 Send message Joined: 2 Nov 12 Posts: 24 Credit: 11,798,226 RAC: 0 |
BOINC overestimates completion times by a large margin at first intentionally. I think it is after ~10 completed tasks the estimates will be close to actual or something along those lines. Thanks for the info. OK I figured that Seti gives 100 credits for 180000GFLOPS task regardless if it is done on CPU, GPU or ARM. Yea, right, credits deaply vary from one project to another. But as I prefer to look for ETI than other projects goal, I'll do only SETI on all my platforms and stop watching my BOINC score. I would say it's sign of code quality still had to be reached on other projects. Tanks! I couldn't understand that by myself before reading it. I tried this morning to run with NativeBoinc lock and a heat sink (!) on my Note 2 and I got no throttling and way better performance. I use maximum undervoltage possible but it is still too hot at stock 1.6Ghz. So no need to add GPU crunching on ARM device. It will just throttle more. |
William Send message Joined: 14 Feb 13 Posts: 2037 Credit: 17,689,662 RAC: 0 |
SETI@Home uses CreditNew. Which is the recent credit system the BOINC developers created. As far as I know SETI@Home is the only project that uses it. Also other projects can more or less "pay" however much credit they would like per flop. Some projects give large amounts of credit as a way to attract users I suppose. Of the projects I know, Albert@home (Einstein beta project), SIMAP and NumberFields run with CreditNew. MW also runs CreditNew - they certainly tend to run latest server version (with all the problems that entails). That fact that MW pays so far above parity may be just bad design [and please don't get me started on the CreditNEw mess] or deliberately. One of the main screws to turn is the estimated fpops. Seti and Albert are very good at estimating that - consequently their apps pay close to what boinc somewhere defines as the baseline. If MW overestimate their fpops they ultimately hand out more credit. [Edit: and they appear to do so by a magnitude or two at least, juding from their crazily high APRs] As I said, that may be deliberately or just poor design. It certainly attracts the credit whores. A person who won't read has no advantage over one who can't read. (Mark Twain) |
mimo Send message Joined: 7 Feb 03 Posts: 92 Credit: 14,957,404 RAC: 0 |
not only due gpu. was u trying to use the Linaro toolchain for building ? |
Swordfish Send message Joined: 5 Aug 06 Posts: 72 Credit: 3,014,493 RAC: 0 |
First 2 WU's on Samsung Galaxy Tab2 10.1 have validated successfully. Still awaiting completion of first WU's on Galaxy Note 10.1 Tab 2. |
skildude Send message Joined: 4 Oct 00 Posts: 9541 Credit: 50,759,529 RAC: 60 |
First 2 WU's on Samsung Galaxy Tab2 10.1 have validated successfully. wow and it only took 10X longer than an Intel(R) Core(TM) i5-2500S CPU @ 2.70GHz [x86 Family 6 Model 42 Stepping 7] I'm seeing this as proof of concept but nothing more. so this proves that it would take 10 phones to produce the same work as single core on an i5. In a rich man's house there is no place to spit but his face. Diogenes Of Sinope |
James Sotherden Send message Joined: 16 May 99 Posts: 10436 Credit: 110,373,059 RAC: 54 |
I left an app running on my android overnight and the thing was hot as all get out. So how are you guys cooling these things? [/quote] Old James |
HAL9000 Send message Joined: 11 Sep 99 Posts: 6534 Credit: 196,805,888 RAC: 57 |
I left an app running on my android overnight and the thing was hot as all get out. So how are you guys cooling these things? While unplugged & not charging my phone stays quite cool. It is showing 27.4ºC for the battery temp which is quite normal. Running overnight on the battery it only sucked down about 40% of the battery. SETI@home classic workunits: 93,865 CPU time: 863,447 hours Join the [url=http://tinyurl.com/8y46zvu]BP6/VP6 User Group[ |
Tazz Send message Joined: 5 Oct 99 Posts: 137 Credit: 34,342,390 RAC: 0 |
I left an app running on my android overnight and the thing was hot as all get out. So how are you guys cooling these things? Running on the battery my Nexus 7 was up to 30C and it chewed up 40% of the battery in 2 hours. Plugged in it's hanging around 27C. </Tazz> |
Swordfish Send message Joined: 5 Aug 06 Posts: 72 Credit: 3,014,493 RAC: 0 |
Samsung Tablets, don't even get warm, when crunching. Then again, the tablets are only set to crunch when connected to the power adapters. |
Link Send message Joined: 18 Sep 03 Posts: 834 Credit: 1,807,369 RAC: 0 |
MW also runs CreditNew - they certainly tend to run latest server version (with all the problems that entails). They only use CreditNew for nBody WUs, separation WUs have fixed Credit depending on how many stars are used. On x86 CPUs they pay only a bit better than SETI stock apps. |
William Send message Joined: 14 Feb 13 Posts: 2037 Credit: 17,689,662 RAC: 0 |
MW also runs CreditNew - they certainly tend to run latest server version (with all the problems that entails). Ah, thanks. I was looking at NBody data. I assumed you could run either one or the other and not on a per app basis. Something new learned. A person who won't read has no advantage over one who can't read. (Mark Twain) |
Alex2 Send message Joined: 2 Nov 12 Posts: 24 Credit: 11,798,226 RAC: 0 |
I left an app running on my android overnight and the thing was hot as all get out. So how are you guys cooling these things? --- TO COOL DOWN A CELL PHONE --- - Close the screen (-10C) - Do not run other apps like music or GPS. (-5C) - It is cooler while not charging, unpluged, or fully charged. - Do not overclock or even downclock. (up to -20C) - Put a heat sink on it. I took one from a dumped P3. (-10C) - Under volt the CPU and the GPU. (-10C) I use CPU Tweak to get CPU temp and STweaks to change voltages. With all that, I run 4x SETI at CPU 50C to 75C with custom kernel that throttle at 80C and I can do 4x 180GLOPS SETI wu per day. I think it may be better to buy a used gamming PC for 200$ and do 10x to 50x more. |
SciManStev Send message Joined: 20 Jun 99 Posts: 6653 Credit: 121,090,076 RAC: 0 |
My thoughts are that power must be provided for long term crunching. Overall throughput is way less that a low end desktop or laptop, and I don't know how long a phone or tablet will last crunching constantly without extra cooling. I may be wrong, but it seems like a cheap computer, with a bit of cooling would do a lot more for a much longer time. To me it just doesn't seem worth it, but I am very pleased that it works. Steve Warning, addicted to SETI crunching! Crunching as a member of GPU Users Group. GPUUG Website |
Wiggo Send message Joined: 24 Jan 00 Posts: 34854 Credit: 261,360,520 RAC: 489 |
My thoughts are that power must be provided for long term crunching. Overall throughput is way less that a low end desktop or laptop, and I don't know how long a phone or tablet will last crunching constantly without extra cooling. Pretty much my own thoughts there, plus the price/performance/time figures alone isn't worth the effort for me even to consider trying to do it. Cheers. |
Alex2 Send message Joined: 2 Nov 12 Posts: 24 Credit: 11,798,226 RAC: 0 |
Hay! We must listen when guys with SETI RAC over 50000 talk. |
Link Send message Joined: 18 Sep 03 Posts: 834 Credit: 1,807,369 RAC: 0 |
I think it may be better to buy a used gamming PC for 200$ and do 10x to 50x more. But an old gaming PC will very likely use more than just 10-50x more energy. |
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