Update readme.md

challenges/gpu/readme.md

@@ -9,7 +9,7 @@ CADES Condo's have several GPUS
 | `gpu`           | 14-0:0:0                | 9       | 32          | Haswell            | 250G              | 233G              | 2x K80 (GK210)   |
 | `gpu_p100`      | 14-0:0:0                | 8       | 36          | Broadwell          | 500G              | 2T                | 2x P100 (GP100)  |
 
-The birthright nodes have 2 GPUS each. We will use one of them to do a Vecor addition in this challenge. 
+The birthright nodes have 2 GPUS each. We will use one of them to do a vector addition in this challenge. 
 ## VecAdd.c 
 
 VecAdd.c adds two vectors A and B to produce C, where Ci = Ai + Bi. This version of code was brought to you Lustre Birthright scratch space during the Globus challenge. 
@@ -113,7 +113,14 @@ Standard SBATCH directives:
 #SBATCH --gres=gpu:2
 ```
 
+We will also use NVprof, NVIDIA's built-in profiler. It will show you that your code is running on the GPU and also give you performance information about the code. 
+
+To use nvprof issue:
+```
+mpirun nvprof ./vecAdd.o
+
 You must use --gres=gpu:2 to tell the job to use the node's GPUs. 
+
 ### Challenge 2 Submit a GPU Job with SLRUM
 
 Below is a batch script to run the VecAdd.o that you compiled on the GPU. Fill in the blanks using your knowledge of the SLURM batch directives