Fix option --num-req (#71)

* Fix option --num-req

* Add usage in doc of traceAnalyzer

doc/quickstart_traceAnalyzer.md

@@ -256,3 +256,15 @@ The block workload has most objects being 4 KiB and 64 KiB, while the Twitter wo
 The Request curve is weighted by request count, and the Object curve is weighted by object count. 
 </div>
 <br> -->
+
+### Advanced features 
+```bash
+# cap the number of requests read from the trace
+./traceAnalyzer --num-req=1000000 ../data/trace.vscsi vscsi
+
+# change output 
+./traceAnalyzer -o my-output ../data/trace.vscsi vscsi
+
+# use part of the trace to warm up the cache
+./traceAnalyzer --warmup-sec=86400 ../data/trace.vscsi vscsi
+```

libCacheSim/bin/traceAnalyzer/cli_parser.cpp

@@ -63,7 +63,7 @@ static struct argp_option options[] = {
     {"trace-type-params", OPTION_TRACE_TYPE_PARAMS,
      "time-col=1,obj-id-col=2,obj-size-col=3,delimiter=,", 0,
      "Parameters used for csv trace", 1},
-    {"num-req", OPTION_NUM_REQ, 0, 0,
+    {"num-req", OPTION_NUM_REQ, "-1", 0,
      "Num of requests to process, default -1 means all requests in the trace",
      1},
 
@@ -133,7 +133,7 @@ static error_t parse_opt(int key, char *arg, struct argp_state *state) {
       strncpy(arguments->ofilepath, arg, OFILEPATH_LEN);
       break;
     case OPTION_NUM_REQ:
-      arguments->n_req = atoi(arg);
+      arguments->n_req = atoll(arg);
       break;
     case OPTION_TIME_WINDOW:
       arguments->analysis_param.time_window = atoi(arg);