minor updates

update documentation of traceConv;
add better description in Belady algorithm

doc/quickstart_traceUtils.md

@@ -7,21 +7,22 @@ Print requests from a trace.
 
 ```bash
 # print 10 requests from a trace
-./tracePrint ../data/trace.vscsi vscsi -n 10
+./bin/tracePrint ../data/cloudPhysicsIO.vscsi vscsi -n 10
 ```
 
 ### traceConv
-Convert a trace to libCacheSim format so it has a smaller size, contains next request time (oracle information) and runs faster. 
+Convert a trace to oracleGeneral format so you can run it faster (10x speedup) using less memory. Meanwhile, the generated trace has a smaller size, contains next request time. 
 ```bash
-./traceConv ../data/trace.vscsi vscsi ../data/trace.vscsi.bin
+# the first parameter is the input trace, the second parameter is trace type, the third parameter is the output trace path
+./bin/traceConv ../data/cloudPhysicsIO.txt txt cloudPhysicsIO.oracleGeneral.bin
 ```
-Note that the conversion supports all trace types including csv trace. Note that if the object id is numeric, add the option -e `obj_id_is_num=1` to the command line, which reduces memory usage.
+Note that the conversion supports all trace types including csv trace. Moreover, if the object id is numeric, add the option `-e obj_id_is_num=1` to the command line, which reduces memory usage.
 
 
 We can also sample a trace to reduce the size of the trace. 
 ```bash
 # sample 1% of the trace
-./traceConv ../data/trace.vscsi vscsi ../data/trace.vscsi.bin -s 0.01
+./bin/traceConv ../data/cloudPhysicsIO.vscsi vscsi ../data/cloudPhysicsIO.oracleGeneral -s 0.01
 ```
 
 

libCacheSim/bin/cachesim/cache_init.h

@@ -87,6 +87,10 @@ static inline cache_t *create_cache(const char *trace_path,
   } else if (strcasecmp(eviction_algo, "belady") == 0) {
     if (strcasestr(trace_path, "oracleGeneral") == NULL) {
       WARN("belady is only supported for oracleGeneral trace\n");
+      WARN("to convert a trace to oracleGeneral format\n");
+      WARN("./bin/traceConv input_trace trace_format output_trace\n");
+      WARN("./bin/traceConv ../data/cloudPhysicsIO.txt txt cloudPhysicsIO.oracleGeneral.bin\n");
+      exit(1);
     }
     cache = Belady_init(cc_params, eviction_params);
   } else if (strcasecmp(eviction_algo, "nop") == 0) {