Posts by Keith Myers

1) Message boards : News : New N-Body Runs (Message 76315) Posted 28 Jul 2023 by Keith Myers Post: Download the non-MT app and use it in a anonymous platform via an app_info.xml.
2) Message boards : Number crunching : Is there a way to split total available cores over multple tasks here? (Message 76305) Posted 21 Jul 2023 by Keith Myers Post: The nthreads parameter is ONLY for MT tasks. It sets the maximum number of threads per task to use. For the OP who wanted to run on 15 threads total for the host, that works out as 3 tasks in total using 5 threads each. You can drop the ncpus value entirely as it is ignored by the nthreads parameter setting.
3) Message boards : Number crunching : New Benchmark Thread - times wanted for any hardware, CPU or GPU, old or new! (Message 75843) Posted 22 Jun 2023 by Keith Myers Post: I had to use BoincStats to find a 7900X WAY down the lists. ~2300 or so before one showed up. But not active recently enough to show what its N-body times were.
4) Message boards : News : Separation Project Coming To An End (Message 75841) Posted 22 Jun 2023 by Keith Myers Post: Gpu asteroids tasks finish in approximately 20 minutes minutes for me. Maybe your boinc client incorrectly estimated time? I generally do a Asteroid CUDA gpu task every 2-3 minutes on all my hosts. Run at 0.5 gpu_usage.
5) Message boards : News : Separation Application Shutting Down on Tuesday, Jun 20th (Message 75813) Posted 21 Jun 2023 by Keith Myers Post: What about tasks that are completed but awaiting validation? S.Gaber Oldsmar, FL Who knows??
6) Message boards : Number crunching : New Benchmark Thread - times wanted for any hardware, CPU or GPU, old or new! (Message 75788) Posted 21 Jun 2023 by Keith Myers Post: What application?? I assume you mean N-body since that is the only one left and you only mention a cpu. You probably can find one somewhere in the Top 100 lists.
7) Message boards : Number crunching : One WU using only 16 threads. (Message 75754) Posted 20 Jun 2023 by Keith Myers Post: Are you saying universe has an multi-threaded app or just it will use all threads on a multi CPU system with 1 thread per WU? No, I was just commenting that other projects can utilize more than a single physical cpu in a host. Universe tasks are only single threaded for running on a single core. But if you have a two socket host supporting 128 threads per socket, you can have 256 Universe tasks running for example.
8) Message boards : News : New Poll Regarding GPU Application of N-Body (Message 75741) Posted 20 Jun 2023 by Keith Myers Post: Tom, provided the source code location for you already. https://milkyway.cs.rpi.edu/milkyway/forum_thread.php?id=5007&postid=75603 Have at it.
9) Message boards : Number crunching : One WU using only 16 threads. (Message 75657) Posted 17 Jun 2023 by Keith Myers Post: Shows it only using 16 threads. I have a dual processor server that I am running boinc on. It has 8 cores/16 threads per processor. Why doesn't it use all 32 threads? Looks like the N-body application is unaware of the second cpu. I know other projects run all cores on dual socket hosts like the Universe project. So it isn't a problem with BOINC. Need to have one of the Einstein N-body devs answer your question.
10) Message boards : News : Separation Project Coming To An End (Message 75499) Posted 13 Jun 2023 by Keith Myers Post: As long as it is not Linux only :) It is much, much easier to develop in Linux compared to Windows. Nothing preventing a good Windows developer from tackling a N-body gpu app. But no reason to NOT develop an enhanced N-body gpu app for Linux users. The user always has the option of running Linux.
11) Message boards : News : Separation Project Coming To An End (Message 75486) Posted 13 Jun 2023 by Keith Myers Post: I would just set the shutdown at the deadline after the last task is sent out. That allows the slowest host with too large a cache to get most of the work returned. Any news or plans for a research paper using the results from the Separation search?
12) Message boards : Number crunching : n=body tasks failing (Message 75348) Posted 27 Apr 2023 by Keith Myers Post: I looked at good results and errored results. Very sparse stderr.txt output. I would hazard a guess that the new tasks for N-body after the project came back are formatted incorrectly since the error points to an incorrect or missing function call.
13) Message boards : News : New Separation Runs (Message 75310) Posted 10 Apr 2023 by Keith Myers Post: You are mistaken. The current tasks are fine. Nobody but you has any issues.
14) Message boards : Number crunching : Tried running nbody: CPU temps way too low. (Message 75294) Posted 7 Apr 2023 by Keith Myers Post: The Boinc "bible" for client/application configuration is here. https://boinc.berkeley.edu/wiki/Client_configuration#Application_configuration It specifically shows an example for MT application configuration and shows the --nthreads parameter syntax.
15) Message boards : Number crunching : Tried running nbody: CPU temps way too low. (Message 75291) Posted 6 Apr 2023 by Keith Myers Post: Simply a matter of your dual Xeon not reporting temps correctly through TThrottle I assume. Has nothing to do with the application or you app_config. You know that the 0℃ temp is impossible unless you are using extreme cooling.
16) Message boards : Number crunching : New Benchmark Thread - times wanted for any hardware, CPU or GPU, old or new! (Message 75282) Posted 6 Apr 2023 by Keith Myers Post: The M1 processor is much faster than that old AMD architecture. However, unfortunately, you will find very little BOINC project support for the the Apple architecture. Very few native applications and no gpu support. Some project apps can be run in x86 emulation mode if you install the Apple Rosetta x86 emulator.
17) Message boards : Number crunching : New Benchmark Thread - times wanted for any hardware, CPU or GPU, old or new! (Message 75279) Posted 4 Apr 2023 by Keith Myers Post: I don't think any project so far had gone back through their applications and recompiled correctly for Ada Lovelace architecture. I've read many reports of projects either not sending work for RTX4000 cards or as you've noted, very sub-optimal gpu utilization for the cards.
18) Questions and Answers : Preferences : milkyway_separation 1.46 Linux x86_64 double OpenCL (Message 75197) Posted 23 Mar 2023 by Keith Myers Post: Only new tasks downloaded after applying the app_config.xml change will be identified with the changes implemented by your app_config. The pre-existing tasks in your cache will still be indentifed by the conditions that existed when they were downloaded. As you found out, reading the config files applies the changes immediately in how BOINC runs.
19) Message boards : Number crunching : ATI RX 580 GPU crunching? (Message 75196) Posted 23 Mar 2023 by Keith Myers Post: Great! I'll give it a shot... now if I can find the app short name You can always get an applications short name from the client_state.xml file.
20) Message boards : Number crunching : ATI RX 580 GPU crunching? (Message 75185) Posted 22 Mar 2023 by Keith Myers Post: Yes, the MW Separation app is rather poorly optimized. It won't use very much of the gpu at all at any time. It begs running at least 2X on the card to get the gpu utilization up closer to 90%. 2X for Nvidia cards is about max becase of how the Nvidia drivers have to virtualize their OpenCL component to run the Separation app. AMD or ATI cards OTOH, typically can run at least 4X or maybe 5X depending on how much memory the card has. The app doesn't really use all that much memory. I don't have any running currently to tell you exactly how much the app uses. I remember its about 1.6GB I think but don't quote me.

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