scripts : update usage text for ci-run.sh

Author: crasm

scripts/ci-run.sh

@@ -10,10 +10,11 @@ usage:
     ci-run.sh <tmp_dir> [<cache_dir>]
 
 This script wraps ci/run.sh:
-* If <tmp_dir> is a ramdisk, you can reduce writes to your SSD.
-    (~30GB per run with openllama_3b_v2)
+* If <tmp_dir> is a ramdisk, you can reduce writes to your SSD. If <tmp_dir> is not a ramdisk, keep in mind that total writes will increase by the size of <cache_dir>.
+    (openllama_3b_v2: quantized models are about 30GB)
 * Persistent model and data files are synced to and from <cache_dir>,
     excluding generated .gguf files.
+    (openllama_3b_v2: persistent files are about 6.6GB)
 * <cache_dir> defaults to  ~/.cache/llama.cpp
 EOF
     exit 1