tools/rw-heatmaps: allow setting RATIO_LIST

Currently, `RATIO_LIST` in the `rw-benchmark.sh` script is defined
as a constant. Running this script end to end takes around 48 hours
with 7 CPU cores. To split the load into smaller jobs, allow this
variable to be provided at run time.

Signed-off-by: Ivan Valdes <[email protected]>

Author: ivanvc

tools/rw-heatmaps/rw-benchmark.sh

@@ -2,7 +2,7 @@
 
 #set -x
 
-RATIO_LIST="1/128 1/8 1/4 1/2 2/1 4/1 8/1 128/1"
+RATIO_LIST="${RATIO_LIST:-1/128 1/8 1/4 1/2 2/1 4/1 8/1 128/1}"
 VALUE_SIZE_POWER_RANGE="8 14"
 CONN_CLI_COUNT_POWER_RANGE="5 11"
 REPEAT_COUNT=5