add filler files to GCR container deployments

Author: ypwong99

experiments/tests/gcr/hellopy.json

@@ -16,7 +16,7 @@
       "DesiredServiceTimes": [
         "0ms"
       ],
-      "FunctionImageSizeMB": 24
+      "FunctionImageSizeMB": 60
     },
     {
       "Title": "parallelism2",
@@ -31,7 +31,7 @@
       "DesiredServiceTimes": [
         "0ms"
       ],
-      "FunctionImageSizeMB": 48,
+      "FunctionImageSizeMB": 100,
       "Parallelism": 2
     }
   ]

src/setup/deployment/packaging/container.go

@@ -36,7 +36,7 @@ var privateRepoURI string = ""
 var loggedIn bool = false
 
 // SetupContainerImageDeployment will package the function using container images and push to registry
-func SetupContainerImageDeployment(function string, provider string) string {
+func SetupContainerImageDeployment(function string, provider string, compressedImageSizeMebibyte float64) string {
 	functionDir := fmt.Sprintf("setup/deployment/raw-code/serverless/%s/%s", provider, function)
 	switch provider {
 	case "aws":
@@ -61,7 +61,7 @@ func SetupContainerImageDeployment(function string, provider string) string {
 		log.Fatalf("Provider %s does not support container image deployment.", provider)
 	}
 
-	taggedImage := fmt.Sprintf("%s_stellar:latest", function)
+	taggedImage := fmt.Sprintf("%s_%v_stellar:latest", function, compressedImageSizeMebibyte)
 	imageName := fmt.Sprintf("%s/%s", privateRepoURI, taggedImage)
 	if builtImages[function] {
 		log.Infof("Container image for function %q is already built. Skipping...", function)

src/setup/run.go

@@ -231,7 +231,14 @@ func ProvisionFunctionsGCR(config *Configuration, serverlessDirPath string) {
 	for index, subExperiment := range config.SubExperiments {
 		switch subExperiment.PackageType {
 		case "Container":
-			imageLink := packaging.SetupContainerImageDeployment(subExperiment.Function, config.Provider)
+			// size of compressed images of GCR functions on Docker Hub are experimentally found to be approximately 21.84 MiB
+			currentSizeInBytes := util.MebibyteToBytes(21.84)
+			targetSizeInBytes := util.MebibyteToBytes(subExperiment.FunctionImageSizeMB)
+			fillerFileSize := packaging.CalculateFillerFileSizeInBytes(currentSizeInBytes, targetSizeInBytes)
+			fillerFilePath := filepath.Join(serverlessDirPath, subExperiment.Function, "filler.file")
+			packaging.GenerateFillerFile(subExperiment.ID, fillerFilePath, fillerFileSize)
+
+			imageLink := packaging.SetupContainerImageDeployment(subExperiment.Function, config.Provider, subExperiment.FunctionImageSizeMB)
 			randomTag := util.GenerateRandLowercaseLetters(5)
 			slsConfig.DeployGCRContainerService(&config.SubExperiments[index], index, randomTag, imageLink, serverlessDirPath, slsConfig.Provider.Region)
 		default: