RPS mode data size feature

.github/configs/wordlist.txt

@@ -778,4 +778,5 @@ async
 AsyncMode
 AsyncResponseURL
 AsyncWaitToCollectMin
-Knative's
+Knative's
+RpsDataSizeMB

cmd/config_dirigent_dandelion_rps.json

@@ -19,6 +19,7 @@
   "RpsRuntimeMs": 10,
   "RpsMemoryMB": 2048,
   "RpsIterationMultiplier": 80,
+  "RpsDataSizeMB": 0.00,
 
   "TracePath": "data/traces/example",
   "Granularity": "minute",

cmd/config_dirigent_rps.json

@@ -19,6 +19,7 @@
   "RpsRuntimeMs": 10,
   "RpsMemoryMB": 2048,
   "RpsIterationMultiplier": 80,
+  "RpsDataSizeMB": 0.00,
 
   "TracePath": "data/traces/example",
   "Granularity": "minute",

cmd/config_knative_rps.json

@@ -15,6 +15,7 @@
   "RpsRuntimeMs": 10,
   "RpsMemoryMB": 2048,
   "RpsIterationMultiplier": 80,
+  "RpsDataSizeMB": 0.00,
 
   "TracePath": "data/traces/example",
   "Granularity": "minute",

docs/configuration.md

@@ -19,6 +19,7 @@
 | RpsRuntimeMs                 | int       | >=0                                                                 | 0                   | Requested execution time                                                             |
 | RpsMemoryMB                  | int       | >=0                                                                 | 0                   | Requested memory                                                                     |
 | RpsIterationMultiplier       | int       | >=0                                                                 | 0                   | Iteration multiplier for RPS mode                                                    |
+| RpsDataSizeMB                | float64   | >= 0                                                                | 0                   | Amount of random data (same for all requests) to embed into each request             |
 | TracePath                    | string    | string                                                              | data/traces         | Folder with Azure trace dimensions (invocations.csv, durations.csv, memory.csv)      |
 | Granularity                  | string    | minute, second                                                      | minute              | Granularity for trace interpretation[^2]                                             |
 | OutputPathPrefix             | string    | any                                                                 | data/out/experiment | Results file(s) output path prefix                                                   |
@@ -55,7 +56,8 @@ Lambda; https://aws.amazon.com/about-aws/whats-new/2018/10/aws-lambda-supports-f
 
 [^6]: Dirigent specific
 
-[^7] It is recommended that the first 10% of cold starts are discarded from the experiment results for low cold start RPS.
+[^7] It is recommended that the first 10% of cold starts are discarded from the experiment results for low cold start
+RPS.
 
 ---
 

pkg/config/parser.go

@@ -61,6 +61,7 @@ type LoaderConfiguration struct {
 	RpsRuntimeMs                int     `json:"RpsRuntimeMs"`
 	RpsMemoryMB                 int     `json:"RpsMemoryMB"`
 	RpsIterationMultiplier      int     `json:"RpsIterationMultiplier"`
+	RpsDataSizeMB               float64 `json:"RpsDataSizeMB"`
 
 	TracePath          string `json:"TracePath"`
 	Granularity        string `json:"Granularity"`

pkg/driver/clients/http_client.go

@@ -2,6 +2,7 @@ package clients
 
 import (
 	"bytes"
+	"crypto/rand"
 	"encoding/json"
 	log "github.com/sirupsen/logrus"
 	"github.com/vhive-serverless/loader/pkg/common"
@@ -33,6 +34,23 @@ func newHTTPInvoker(cfg *config.LoaderConfiguration) *httpInvoker {
 	}
 }
 
+var payload []byte = nil
+
+func CreateRequestPayload(sizeInMB float64) *bytes.Buffer {
+	byteCount := int(sizeInMB * 1024.0 * 1024.0) // MB -> B
+
+	if payload == nil {
+		payload = make([]byte, byteCount)
+
+		n, err := rand.Read(payload)
+		if err != nil || n != byteCount {
+			log.Errorf("Failed to generate random %d bytes.", byteCount)
+		}
+	}
+
+	return bytes.NewBuffer(payload)
+}
+
 func (i *httpInvoker) Invoke(function *common.Function, runtimeSpec *common.RuntimeSpecification) (bool, *mc.ExecutionRecord) {
 	isDandelion := strings.Contains(strings.ToLower(i.cfg.Platform), "dandelion")
 	isKnative := strings.Contains(strings.ToLower(i.cfg.Platform), "knative")
@@ -48,8 +66,6 @@ func (i *httpInvoker) Invoke(function *common.Function, runtimeSpec *common.Runt
 	////////////////////////////////////
 	// INVOKE FUNCTION
 	////////////////////////////////////
-	start := time.Now()
-	record.StartTime = start.UnixMicro()
 
 	requestBody := &bytes.Buffer{}
 	/*if body := composeDandelionMatMulBody(function.Name); isDandelion && body != nil {
@@ -58,8 +74,16 @@ func (i *httpInvoker) Invoke(function *common.Function, runtimeSpec *common.Runt
 	if body := composeBusyLoopBody(function.Name, function.DirigentMetadata.Image, runtimeSpec.Runtime, function.DirigentMetadata.IterationMultiplier); isDandelion && body != nil {
 		requestBody = body
 	}
+	if i.cfg.RpsTarget != 0 {
+		ts := time.Now()
+		requestBody = CreateRequestPayload(i.cfg.RpsDataSizeMB)
+		log.Debugf("Took %v to generate request body.", time.Since(ts))
+	}
+
+	start := time.Now()
+	record.StartTime = start.UnixMicro()
 
-	req, err := http.NewRequest("GET", "http://"+function.Endpoint, requestBody)
+	req, err := http.NewRequest("POST", "http://"+function.Endpoint, requestBody)
 	if err != nil {
 		log.Errorf("Failed to create a HTTP request - %v\n", err)
 

pkg/driver/deployment/dirigent.go

@@ -130,6 +130,8 @@ func deployDirigent(function *common.Function, controlPlaneAddress string, busyL
 		log.Error("Function registration returned no data plane(s).")
 		return
 	}
+
+	log.Debugf("Got the following endpoints: %v", endpoints)
 	function.Endpoint = endpoints[rand.Intn(len(endpoints))]
 
 	checkForRegistration(controlPlaneAddress, function.Name, prepullMode)