I had the same problem with multiple WinXP DOS sessions ... the op sys did not maintain good separation of memory or disk Under Linux and Win7 you can get nice clean separate DOS machines using open source Oracle VirtualBox machines up to the limits of your hardware CPUs and Memory A working virtual machine FreeDOS machine is in the repository at http://www.fractint.org/ftp/virtual_environments/ Install open source VirtualBox see: https://www.virtualbox.org/ , then install the FreeDOS-Fractint.ova (as many copies as you want to run) They are for all intent and purposes separate computers. You can control video, memory, cpu resource use, and disk use for each machine. On 1/4/2015 8:52 PM, Hal Lane wrote:
David said: -----------
...maybe you could run multiple Fractint disk-video sessions, and if your OS is smart of allocating CPU cores, each session could be running on its own core. So today's multicore CPUs could really blast through generating multiple fractals. -- David W. Jones I think it's typical for OSs that support multi-core CPUs to give the user the ability to assign tasks to specific cores. Sometimes this can be done on a semi-permanent basis, although you might have to have several slightly differently named copies of the program you are running multiple copies of. Perhaps: DosBox1, DosBox2, etc. and possibly Fractint1, Fractint2, etc. I've not tried this.
Under Windows 98 I ran up to a half dozen disk video Fractint DOS sessions. Win98 kept all their resources separate. The single core processor was time-sliced by the OS between all the Fractints.
However, under WinXP, I found that if I ran two copies of Fractint in DOS sessions -- both using disk video at the same time -- that, of the two sessions, one would have corrupting pixels from the other one in the saved image.
Has anyone else encountered this?
- Hal Lane
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