update readme with system resources

research/fed-bpt/README.md

@@ -55,6 +55,8 @@ nvflare job create -force -j "./jobs/fedbpt" -w "fedbpt" -sd "./src" \
 -f app/config/config_fed_server.conf min_clients=${N_CLIENTS} num_rounds=200 seed=${SEED}
 ```
 Start the FL simulator with `N_CLIENTS` clients in parallel.
+The following setting requires a GPU with at least 24 GB memory and enough system memory to run the clients in parallel (we recommend at least 40 GB).
+For a system with less resources, you can set -t to be a lower number and simulate the clients running sequentially.
 ```commandline
 OUT_DIR="/tmp/nvflare/fedbpt"
 nvflare simulator ./jobs/fedbpt -n ${N_CLIENTS} -t ${N_CLIENTS} -w ${OUT_DIR}