I received a question about CPU resources from the end user. [System Configuriation] CPU1：Xeon E5-2697v4 2.3GHz (18 core x Hyper thread =36 Logical thread) CPU2：Xeon E5-2697v4 2.3GHz (18 core x Hyper thread =36 Logical thread) Total 36 Core CPU, 72 Logical thread RAM 256GB GPU nVidia Quadro …

Question for Adam Jordan, P.E.: Can you point me to more information about your comments on ‘too much RAM can cause significant accuracy and quality problems’? I am curious as to what you mean by this.

Thomas, you won’t find any data (that I know of) on the subject because the individual projects are so varied. I can tell you that significant differences in point cloud results can be attributed to how much RAM Pix4D uses in conjunction with hardware architecture differences. I have spent a lot o…

By RAM allocation, are you talking a software setting? My real interest is in what actual differences you are seeing in data quality that you are attributing to ‘too much RAM’. This is a troubling concept for me. I am a professional land surveyor by profession, and data quality is a key issue for…

You can adjust the RAM within Pix4D for your testing. Your projects may be different than mine and the exact science I use in cell tower 3D modeling is a trade secret. You can also lower accuracy and data quality with nearly every setting in Pix4D (or artificially increase detail when it actually …

Thank for the response Adam. We have done testing to ensure that the product meets our needs, and I do understand in general your comments about the multitude of settings affecting accuracy of results. My question still stands though with respect to what effects or anomalies are you seeing in the r…

I’d also be interested to better understand what you mean Adam. RAM should not change the quality of the output. It can make your project fail if there is not enough RAM, but the RAM should not have an effect on accuracy.

Here are 3 pictures of the point cloud and report from 3 different hardware configurations (about 6 months ago) with identical pictures and settings (first is my old desktop, second is Amazon EC2, and third is Microsoft Azure). I also have some other projects comparing just the RAM but it will take…

Thanks for posting, Adam. This helps to see what you are seeing with the different systems processing the same data. This is a bit alarming, as I would think the end results should be the same independent of processing hardware, given identical inputs and software settings. Having said that, are …

Thomas, that was to show hardware differences…I have to dig up some other test projects for just RAM differences and post those later this week. Also running the same project a second time on the same hardware will result in different points when you zoom in. None of this information means the res…

I’d like to have a closer look at the projects before making any comment. Adam could you upload the three of them (images, results folder, .p4d, any additional data you have used,…) to a file sharing service and send them through a support request ? Thanks!

Maximum CPU value

PIX4Dmapper PIX4Dmapper Questions/Troubleshooting

Adam_Jordan_P.E December 8, 2017, 12:42am 16

Here is the new RAM comparison data: https://community.pix4d.com/t/3579-RAM-Comparison-in-Point-Cloud-Results

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Maximum CPU value

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