Hello, I'm using ultratracer in centos7 (in vmware) to trace some terafly datasets of lightsheet and fMOST image. My parameters are : 
./start_vaa3d.sh -x ultratracer -f trace_APP2 -i 'XXXXXX' -p 'YYYYYY' 512 1 1 AUTO

My test terafly dataset is just 20GB. CPU is I7 4770K. I put terafly datasets in PC harddisk, so the IO should be OK. Though I run ultratracer in vmware, I notice that ultratracer just use one CPU core and I think the computing speed is the same as native Linux system. I have run 12 hours and it seems need to run for more time. Do you have some ideas to run faster ? Thanks.

You can check intermediate results from **tmp_APP2 folder under the same image folder. Normally, you may need to run app2 tracing couple times along under "Plug-In"-->"neuron_tracing"-->"Vaa3D_Neuron2" using different parameters to find the best one for your data. And then you can use ultratracer with app2 as the base tracer. Hope it helps.