# TITAN -- It's a tricky beast, but it was [1st](https://www.top500.org/lists/2012/11/) (on the [top 500](https://www.top500.org/lists/2017/11/))!
Is a tricky beast.
## AMD Interlagos based machine, like OIC phase 5.
## it is an AMD Interlagos based machine, like OIC phase 5.
The key is there are only one floating point unit per two cores. So from a science perspective there are only 8 cores per node, not the sixteen listed. Additionally your code needs to bind to just one core per pair. See [Cray XK7 CPU info](https://www.olcf.ornl.gov/support/system-user-guides/titan-user-guide/#333)
The key is there are only one floating point unit per two cores. So from a science perspective there are only 8 cores per node, not the sixteen listed. Additionally your code needs to bind to just one core per pair. See [Cray XK7 CPU info](https://www.olcf.ornl.gov/support/system-user-guides/titan-user-guide/#333)
## mpimom processes run on service nodes (this complicates what PBS scripts can do)
## Service nodes run mpimom processes and PBS scripts -- (this complicates what PBS scripts can do)
## There is only one GPU per node, i.e. 16 CPU, 8 FPU, 1 GPU. It's generally on you to manage this.
## There is only one GPU per node, i.e. 16 CPU, 8 FPU, 1 GPU. It's generally on you to manage this.
If you are having trouble probably best to just contact @epd
If you are having trouble probably best to just contact @epd
