Posts by Jim1348 Universe@Home

41) Message boards : Number crunching : Double your task throughput on Linux (Message 4456) Posted 1 Sep 2020 by Jim1348 Post: See the discussion on the benefits of upgrading to Ubuntu 20.04: https://universeathome.pl/universe/forum_thread.php?id=526&postid=4446 Note especially how to prevent login problems with Nvidia cards: https://universeathome.pl/universe/forum_thread.php?id=550&postid=4454 Here is more info: https://askubuntu.com/questions/1229821/login-loop-after-installing-20-04
42) Message boards : Number crunching : Double or Triple your task throughput on Windows! (Message 4455) Posted 1 Sep 2020 by Jim1348 Post: If you do a little prep work before rebooting, you can avoid all the issues. Yes, that will probably fix it. I ended up editing that file after the fact, after trying a few other things, a bit of the hard way. I will get it better on my other machines. I am more annoyed that Ubuntu has not figured it out. Thanks for your help.
43) Message boards : Number crunching : Double or Triple your task throughput on Windows! (Message 4453) Posted 1 Sep 2020 by Jim1348 Post: On my Ryzen 2700, BHspin v2 went from 1 hour 45 minutes on Ubuntu 18.04 to 57 minutes on Ubuntu 20.04. I didn't think gains like that were possible. I wonder about my other projects? The upgrade process has the usual pains. Be prepared for a siege if you have an Nvidia card. The login does not work. I have seen it all before. They just mix up the solutions differently so you have to spend time undoing the ones that don't work to use the ones that do work. Lots of luck.
44) Message boards : Number crunching : Double or Triple your task throughput on Windows! (Message 4451) Posted 31 Aug 2020 by Jim1348 Post: So upgrading to Ubuntu 20.04 should at least double your BHspin task speed. Thanks to both you and Keith. I usually find the newer Ubuntu versions to add problems the old ones didn't have, so avoid upgrading. But this will be worth it. I always have a machine on Universe.
45) Message boards : Number crunching : Double or Triple your task throughput on Windows! (Message 4448) Posted 31 Aug 2020 by Jim1348 Post: When I switched over to Ubuntu (16.04) several years ago, it was mainly because of Universe. I thought it was the only practical way to do it.
46) Message boards : Number crunching : No tasks available (Message 4432) Posted 18 Aug 2020 by Jim1348 Post: This happened before and I sent another PM to Krzysztof to inform him that he needs to make new work again. Hope he can remedy the situation as quickly as he did last time. In August, I always assume that they have other priorities. (Europe is different than the U.S.). But Asteroids has some work at the moment. As you probably know, it comes and goes.
47) Message boards : Number crunching : Upload of WUs failed (Message 4404) Posted 23 Jul 2020 by Jim1348 Post: They are OK here. I uploaded a BHspin2 an hour ago, and a ULX 20 minutes ago.
48) Message boards : Number crunching : No tasks available (Message 4397) Posted 17 Jul 2020 by Jim1348 Post: This project has about twice as many "Users in last 24 hours" as it did at the beginning of the year. That is remarkable. I hope the work supply keeps up with demand.
49) Message boards : Science : Two Black Holes Colliding Not Enough? Make It Three (Message 4381) Posted 29 Jun 2020 by Jim1348 Post: Long, long ago, about 4 billion years before now and in a faraway galaxy, a pair of black holes collided. Typically such an event would leave no visible trace, just a shuddering of space-time — gravitational waves — and a bigger black hole. (Black holes emit no light.) But these black holes were part of a swirl of star parts, gas and dust surrounding a third, gigantic black hole, a supermassive black hole 100 million times more massive than the sun. As a result, the merging pair generated a shock wave of heat and light that allowed the collision to be seen as well as heard. That is the explanation being offered by a group of astronomers, led by Matthew Graham of the California Institute of Technology, for a curious flash of light they recorded last year. Their conclusion, announced on Thursday, was laid out in a paper in Physical Review Letters. If the result holds up, it would mark the first time that colliding black holes have produced light as well as gravitational waves. “We have seen a visible signal from a previously invisible part of the universe,” Dr. Graham said. https://www.nytimes.com/2020/06/25/science/black-hole-collision-ligo.html
50) Message boards : Number crunching : Getting a 196 (0x000000C4) EXIT_DISK_LIMIT_EXCEEDED error (Message 4375) Posted 25 Jun 2020 by Jim1348 Post: I think the project admins set a wrong value for expected disk space usage for the task and it exceeded the set task parameters. Yes, I got one too on an Ubuntu machine though it worked OK on a Windows machine. https://universeathome.pl/universe/workunit.php?wuid=47394076
51) Message boards : Number crunching : Upload fails (Message 4354) Posted 10 Jun 2020 by Jim1348 Post: The same Seti private developers are working on an enhanced Einstein application. Very nice. I was hoping someone could offload more work to the GPU. And when they run out of things to do, they can come back to Universe. There was a GPU app under development here, but it never worked out. Maybe a fresh pair of eyes can look into it.
52) Message boards : Number crunching : Upload server is straining under the load (Message 4350) Posted 10 Jun 2020 by Jim1348 Post: OK, I will keep my eye out for it. I decided to put 10 cores of a Ryzen 2700 on it (Ubuntu 18.04.4) on BHSpin v2 and ULX.. The run times I am seeing are not that bad - maybe the usual 30% slower than a Ryzen 3600 for example, though I don't have that many yet. But I figured out how to keep it cool in the summer - I placed it out on the porch. It is an infinite heat sink. I wonder if it is a local effect because you have so many fast cores that you are seeing it more than usual? Though I would think the server would only care about the overall load, but there may be some other limit in the system.
53) Message boards : Number crunching : Upload server is straining under the load (Message 4346) Posted 7 Jun 2020 by Jim1348 Post: I just like that the 3950X does so well on both applications compared to any other architecture. The apps really like the enhanced FPU of Zen 2. The problem I have is that the 3950X is good at everything, so I reserve it for Folding on the CPU, where I average over 600 k PPD. That is unheard of for a CPU, and up in GPU territory. But it allows me to keep going during the summer on some machines that I might otherwise have to shut down.
54) Message boards : Number crunching : Upload server is straining under the load (Message 4344) Posted 7 Jun 2020 by Jim1348 Post: There were less than 2000 users a few months ago (around 1850 in fact), and now well over 3000 if you add BHspin + ULX. I have laid off Universe for a while, so that you can do them.
55) Message boards : Number crunching : Odd performance on different computers (Message 4192) Posted 5 May 2020 by Jim1348 Post: Notice anything funny there...you are running too many threads on the AMD and are using the virtual cores for 4 of the tasks reducing the efficiency of each task, cut it back to 8 threads at a time and see if it doesn't speed up alot. (1) Cutting it back to 8 threads (in effect, 8 full cores) increases the speed of each task, but it does not increase the efficiency. It reduces it. The total throughput will be greater if you use the virtual cores (all 16 of them). (2) Yes, Linux is better than Windows. Use Windows on WCG/MCM, or Rosetta, or if you want astronomy on MilkyWay n-body or Einstein. They all do well on Windows. (3) I have crunched a lot of BHspin v2 on both Ryzens and Intel. The speed on a Ryzen 2700 is almost the same (maybe slightly more) than on an i7-3700 under comparable conditions; i.e., using the same percentage of the cores. (4) At the moment, I am using a Ryzen 2600 under Ubuntu 18.04.4, with 11 cores devoted to Universe and 1 core reserved for a GPU, but not in use at the moment. I am averaging 1 hour 33 minutes on BHspin v2 and about 32 minutes 31 seconds (very consistently) for ULX.
56) Message boards : Number crunching : Few tasks downloading and no connections? (Message 4066) Posted 19 Mar 2020 by Jim1348 Post: Yes, I have been having stuck uploads for about six hours. Just hang in there and it will be fixed. EDIT: They are starting to go now.
57) Message boards : News : A synthetic black hole database published! (Message 4044) Posted 3 Mar 2020 by Jim1348 Post: Thank you. The science is undoubtedly impressive, though I might not get the fine points. But with all the crunching we have been doing, I have been wondering what we have been accomplishing. I think you answered that very well.
58) Message boards : Number crunching : NVIDIA TESLA computing (Message 4016) Posted 24 Jan 2020 by Jim1348 Post: No, this is a CPU only project.
59) Message boards : Number crunching : WU completion times (Message 4006) Posted 16 Jan 2020 by Jim1348 Post: I would not be surprised if they are sending out different batches of work units. I think I have seen one hour on my machine at one point. Your results seem consistent though. My own Ryzen 3000 series (3600 and 3700x) are maybe 30% faster than my Ryzen 2600 and 2700, but double the speed does not seem likely. Or maybe the large L3 cache of the 3900x does it? Some projects benefit from cache more than others. I will look around at the other projects and see how they do. I may have to put together a 3900x. The high efficiency of that chip is remarkable too, and would work through the summer. Thanks for your input.
60) Message boards : Number crunching : WU completion times (Message 4001) Posted 15 Jan 2020 by Jim1348 Post: Thanks. That makes sense. It is always good to be thinking of the next upgrade, especially with Ryzens. Intel is such a disappointment that I no longer bother to even look at their stuff. Let me know when they are back.

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