[Feature] downstream API supports aggregation

Instead of transmitting clock times, the downstream API is changed to
allow application side aggregation of phases below a damper value. This
is to decrease the frequency of messages sent.

The downstream API will now transmit the actual time a CPU spent in
computation and the total phase time.

See Issue #2

downstream_api.c

@@ -71,9 +71,9 @@ int nrm_send_progress(struct nrm_context *ctxt, unsigned long progress)
     return 0;
 }
 
-int nrm_send_phase_context(struct nrm_context *ctxt, int cpu, unsigned long 
-        long int startCompute, unsigned long long int endCompute, unsigned 
-        long long int startBarrier, unsigned long long int endBarrier)
+int nrm_send_phase_context(struct nrm_context *ctxt, unsigned int cpu, unsigned
+    int aggregation, unsigned long long int computeTime, unsigned long long int
+    totalTime)
 {
     char buf[512];
     struct timespec now;
@@ -83,8 +83,8 @@ int nrm_send_phase_context(struct nrm_context *ctxt, int cpu, unsigned long
 
     if(timediff > NRM_RATELIMIT_THRESHOLD) 
     {
-        snprintf(buf, 512, NRM_PHASE_CONTEXT_FORMAT, cpu, startCompute, 
-                endCompute, startBarrier, endBarrier, ctxt->app_uuid);
+        snprintf(buf, 512, NRM_PHASE_CONTEXT_FORMAT, cpu, aggregation,
+            computeTime, totalTime, ctxt->app_uuid);
         int err = zmq_send(ctxt->socket, buf, strnlen(buf, 512), 0);
         assert(err > 0);
     }

downstream_api.h

@@ -28,7 +28,7 @@ struct nrm_context {
 
 #define NRM_START_FORMAT "{\"type\":\"application\", \"event\":\"start\", \"container\": \"%s\", \"uuid\": \"%s\", \"progress\": true, \"threads\": null}"
 #define NRM_PROGRESS_FORMAT "{\"type\":\"application\", \"event\":\"progress\", \"payload\": \"%lu\", \"uuid\": \"%s\"}"
-#define NRM_PHASE_CONTEXT_FORMAT "{\"type\":\"application\", \"event\":\"phase_context\", \"cpu\": \"%d\", \"startcompute\": \"%llu\", \"endcompute\": \"%llu\", \"startbarrier\": \"%llu\", \"endbarrier\": \"%llu\", \"uuid\": \"%s\"}"
+#define NRM_PHASE_CONTEXT_FORMAT "{\"type\":\"application\", \"event\":\"phase_context\", \"cpu\": \"%u\", \"aggregation\": \"%u\", \"computetime\": \"%llu\", \"totaltime\": \"%llu\", \"uuid\": \"%s\"}"
 #define NRM_EXIT_FORMAT "{\"type\":\"application\", \"event\":\"exit\", \"uuid\": \"%s\"}"
 #ifdef __cplusplus
 extern "C"{
@@ -38,9 +38,9 @@ int nrm_init(struct nrm_context *, const char *);
 int nrm_fini(struct nrm_context *);
 
 int nrm_send_progress(struct nrm_context *, unsigned long);
-int nrm_send_phase_context(struct nrm_context *ctxt, int cpu, unsigned long 
-        long int startCompute, unsigned long long int endCompute, unsigned 
-        long long int startBarrier, unsigned long long int endBarrier);
+int nrm_send_phase_context(struct nrm_context *ctxt, unsigned int cpu, unsigned
+    int aggregation, unsigned long long int computeTime, unsigned long long int
+    totalTime);
 
 #ifdef __cplusplus
 }