Vary backup size during load test

Author: Furisto

dev/loadgen/prod-benchmark.yaml

@@ -56,9 +56,12 @@ repos:
       value: "6G"
     - name: "MEMORY_TIMEOUT" # stop cpu stress test after N seconds
       value: "600s"
+    # backup
+    - name: "BACKUP_SIZE" # size of the backup in gigabyte
+      value: 3
     # tasks
     - name: "GITPOD_TASKS"
-      value: "[{\"name\":\"start cpu stress\",\"command\":\"stress-ng --cpu ${CPU_COUNT:-3} --backoff ${CPU_BACKOFF:-10000000} --timeout ${CPU_TIMEOUT:-600s}\"},{\"name\":\"start io stress\",\"command\":\"fio --name io-stress --eta-newline=5s --filename=/workspace/gitpod.temp --rw=${DISK_IO_MODE} --size=${DISK_IO_FILE_SIZE:-2g} --io_size=${DISK_IO_TOTAL:-50g} --blocksize=${DISK_IO_BLOCKSIZE} --ioengine=libaio --fsync=${DISK_IO_FSYNC} --iodepth=${DISK_IO_DEPTH} --direct=1 --numjobs=${DISK_IO_JOBS} --runtime=${DISK_IO_TIMEOUT:-600}\"},{\"name\":\"start memory stress\",\"command\":\"stress-ng --vm 1 --vm-keep --vm-bytes ${MEMORY_BYTES:-6G} --timeout ${MEMORY_TIMEOUT:-600s}\"}]"
+      value: "[{\"name\":\"start cpu stress\",\"command\":\"stress-ng --cpu ${CPU_COUNT:-3} --backoff ${CPU_BACKOFF:-10000000} --timeout ${CPU_TIMEOUT:-600s}\"},{\"name\":\"start io stress\",\"command\":\"fio --name io-stress --eta-newline=5s --filename=/workspace/gitpod.temp --rw=${DISK_IO_MODE} --size=${DISK_IO_FILE_SIZE:-2g} --io_size=${DISK_IO_TOTAL:-50g} --blocksize=${DISK_IO_BLOCKSIZE} --ioengine=libaio --fsync=${DISK_IO_FSYNC} --iodepth=${DISK_IO_DEPTH} --direct=1 --numjobs=${DISK_IO_JOBS} --runtime=${DISK_IO_TIMEOUT:-600}\"},{\"name\":\"start memory stress\",\"command\":\"stress-ng --vm 1 --vm-keep --vm-bytes ${MEMORY_BYTES:-6G} --timeout ${MEMORY_TIMEOUT:-600s}\"},{\"name\":\"create backup file\",\"command\":\"dd if=/dev/zero of=/workspace/benchmark-backup bs=1000M count=${BACKUP_SIZE:-2}\"}]"
   - cloneURL: https://github.com/gitpod-io/template-typescript-node
     cloneTarget: master
     score: 20