Hi Radu, I had switched to main branch, and added -DCMAKE_BUILD_TYPE=Release to my cmake command, after compilation finished, then I ran demo_VEH_WheeledJSON again, but above problems still remain:
1. RTF (real time factor) is too large, about 50 - 70 2. frame rate is too low, it looks like Irrlicht doesn't use GPU for rendering, run nvidia-smi command, there is no demo process in output My compiling and running env is as follows: CPU: Intel(R) Xeon(R) Silver 4210R CPU @ 2.40GHz GPU: Quadro RTX 4000 OS: Ubuntu 18.04 x86_64 cmake: 3.25.2 GCC & G++: 7.5.0 Is there any problem in my env or compilation process? 在2023年8月9日星期三 UTC+8 13:05:36<Radu Serban> 写道： > Bean, > > > > You are actually *not *building in Release mode. The default build type > for CMake is the “empty” build type which does *not* use any optimization > flags. > > Add -DCMAKE_BUILD_TYPE=Release to your cmake command. > > > > The delay you see in vehicle response is most likely due to processing and > buffering of keyboard events combined with slow simulation (because the > code was not built in release mode). Unless modified, that demo uses by > default a HMMWV model and that vehicle is a bit more responsive than what > you observe. Having said that, the proper way of testing vehicle > performance (e.g., acceleration performance) is by setting driver inputs > (throttle) programmatically and not interactively. See for example > demo_VEH_HMMWV_Accel. > > > > Finally, unless you have a strong reason not to, I strongly suggest you > checkout the ‘main’ branch of the Chrono repository. We continuously push > fixes and improvements to the code and many of those occurred since the 8.0 > release. Working with the current development code also makes it easier for > people to test and check issues users report (few will keep around a clone > of the released version). > > > > --Radu > > > > *From:* [email protected] <[email protected]> *On > Behalf Of *Bean Young > *Sent:* Wednesday, August 9, 2023 4:26 AM > *To:* ProjectChrono <[email protected]> > *Subject:* Re: [chrono] Re: why can't the vehicle in demo_VEH_WheeledJSON > move? > > > > Hi Dan, > > > > I ran demo_VEH_WheeledJSON on my workstation with 20-core cpu (@2.40 Hz) > and 32 GB RAM, and built the code in release mode, but this demo and others > are running very slowly, and the frame rate is very slow, I don't know what > went wrong. The compile command I used, is as follows: > > > > cmake -G"Unix Makefiles" -H/root/chrono -B/root/build_chrono > -DENABLE_MODULE_IRRLICHT=ON -DENABLE_MODULE_POSTPROCESS=ON > -DENABLE_MODULE_VEHICLE=ON -DENABLE_MODULE_OPENGL=ON -DENABLE_MODULE_GPU=ON > --install-prefix=/usr/local/chrono > make -j4 > make install > > 在2023年8月9日星期三 UTC+8 09:53:24<Dan Negrut> 写道： > > Bean - I think it’s relatively reasonable to expect a vehicle to take 2 > seconds to reach 5.15 m/s. That’s 18.5 km/h – this value depends on the > mass of the vehicle and engine used (HMMWV, it seems). This vehicle > simulation should be real time, unless you have an old laptop or so. Also, > make sure you built the code in release mode, not debug mode. > > Dan > > --------------------------------------------- > > Bernard A. and Frances M. Weideman Professor > > NVIDIA CUDA Fellow > > Department of Mechanical Engineering > > Department of Computer Science > > University of Wisconsin - Madison > > 4150ME, 1513 University Avenue > > Madison, WI 53706-1572 > > 608 772 0914 <(608)%20772-0914> > > http://sbel.wisc.edu/ > > http://projectchrono.org/ > > --------------------------------------------- > > > > *From:* [email protected] <[email protected]> *On > Behalf Of *Bean Young > *Sent:* Tuesday, August 8, 2023 8:45 PM > *To:* ProjectChrono <[email protected]> > *Subject:* [chrono] Re: why can't the vehicle in demo_VEH_WheeledJSON > move? > > > > Hello! > > > > Yes, you are absolutely right! > > After I held down the W key for 2 seconds (in simulation time), I could > see the vehicle get moving at 5.15 m/s: > > > > [image: Image removed by sender.] > > > But 2 seconds of simulation time takes too long in real-world, and how can > I make demo_VEH_WheeledJSON run in real time mode? > > Thankds for help! > > 在2023年8月8日星期二 UTC+8 20:45:28<[email protected]> 写道： > > Hello! > > Can you please try pressing the throttle for longer and seeing if the > vehicle still does not move? It is normal that there is a lag between the > application of the throttle and the movement of the vehicle. This can be > due to two reasons > > 1) The torque converter slips (seen as Tconv slip). In the screenshot you > can also see the T conv out RPM is only 10 and so it is expected that the > vehicle does not move forward. This is similar to a vehicle in real life, > even if you slam the throttle there will be a finite lag before the vehicle > starts moving. > > 2) This lag might seem longer than usual because your simulation might not > be running at Real Time. This means that even though you feel that you have > been pressing the keyboard key for a long time, in simulation time, it is > too low (and still within the lag period). From my experience, pressing the > key for about 1 second simulation time is enough to get the vehicle moving. > > If you still face issues after pressing the key for longer, then there > might be some problem and we can try looking at it together :) > > > > Best > > Huzaifa > > > > On Tuesday, August 8, 2023 at 4:46:03 AM UTC-5 [email protected] wrote: > > I have built Chrono 7.0.3 and 8.0.0 in Ubuntu 18.04, when I > ran demo_VEH_WheeledJSON, I pressed A key on the keybord, I could see the > throttle was increasing, but the vehicle was not moving and the speed was > no change, the screenshot is as follows: > > > [image: Image removed by sender.] > > Can someone help me explain this problem? > > -- > You received this message because you are subscribed to the Google Groups > "ProjectChrono" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/projectchrono/dccb3b76-e564-4a58-9772-316a97cb5c74n%40googlegroups.com > > <https://groups.google.com/d/msgid/projectchrono/dccb3b76-e564-4a58-9772-316a97cb5c74n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > -- > You received this message because you are subscribed to the Google Groups > "ProjectChrono" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > > To view this discussion on the web visit > https://groups.google.com/d/msgid/projectchrono/14f18ff1-90f8-401d-a861-2f1a802136cbn%40googlegroups.com > > <https://groups.google.com/d/msgid/projectchrono/14f18ff1-90f8-401d-a861-2f1a802136cbn%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "ProjectChrono" group. 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