faasnap

FaaSnap

This repo includes the artifact of paper:

Lixiang Ao, George Porter, and Geoffrey M. Voelker. 2022. FaaSnap: FaaS Made Fast Using Snapshot-based VMs. In Seventeenth European Conference on Computer Systems (EuroSys ’22), April 5–8, 2022, RENNES, France. ACM, New York, NY, USA, 17 pages.

The modified Firecracker VMM is in https://github.com/ucsdsysnet/faasnap-firecracker.

The guest kernels are in https://github.com/ucsdsysnet/faasnap-kernel.

Setup

Build

1. Build Firecracker:
   • Clone https://github.com/ucsdsysnet/faasnap-firecracker
   • tools/devtool build
   • The built executable will be in build/cargo_target/x86_64-unknown-linux-musl/debug/firecracker
2. Build guest kernels:
   • Clone https://github.com/ucsdsysnet/faasnap-kernel
   • See faasnap-kernel/README.md
3. Build function rootfs.
   • Build rootfs image. pushd rootfs && make debian-rootfs.ext4 && popd
   • Copy rootfs/debian-rootfs.ext4 to a directory on local SSD.
4. Build the FaaSnap daemon.
   • Build API. swagger generate server -f api/swagger.yaml.
   • Compile the daemon. go get -u ./... && go build cmd/faasnap-server/main.go

Prepare input data and Redis

1. Download ResNet model resnet50-19c8e357.pth to resources/recognition.
2. Start a local Redis instance on the default port 6379.
3. Populate Redis with files in resources directory and its subdirectory. The keys should be the last parts of filenames (basename).

Prepare the environment

1. Run prep.sh.

Evaluation workflow

Experiment E1

1. Configure test-2inputs.json.

   • In "faasnap"
     • base_path is where snapshot files location. Choose a directory in a local SSD.
     • kernels are the locations of vanilla and sanpage kernels.
     • images is the rootfs location.
     • executables is the Firecracker binary for both vanilla and uffd.
     • specify redis_host and redis_passwd accordingly.
   • home_dir is the current faasnap directory.
   • test_dir is where snapshot files location. Choose a directory in a local SSD.
   • Specify host and trace_api.

2. Run tests:

   • sudo ./test.py test-2inputs.json
   • After the tests finish, go to http://<ip>:9411, and use traceIDs to find trace results.

Experiment E2

1. Configure test-6inputs.json.

   • Same as E1. Leave the input definitions unchanged.

2. Run tests:

   • sudo ./test.py test-6inputs.json
   • After the tests finish, go to http://<ip>:9411, and use traceIDs to find trace results.

Experiment E3

1. Configure test-2inputs.json.

   • Same as E1, except for parallelism and par_snapshots.
   • For same snapshot tests, set parallelism to the target parallelism and par_snapshots to 1.
   • For different snapshot tests, set both parallelism and par_snapshots to the target parallelism.

2. Run tests: sudo ./test.py test-2inputs.json

   • After the tests finish, go to http://<ip>:9411, and use traceIDs to find trace results.

Experiment E4

1. Configure test-2inputs.json.

   • Same as E1, except set faasnap.base_path and test_dir to a directory on remote storage.
   • Set settings.faasnap.record_regions.interval_threshold and settings.faasnap.patch_mincore.interval_threshold to 0 for the increased latency of remote storage.

2. Run tests: sudo ./test.py test-2inputs.json

   • After the tests finish, go to http://<ip>:9411, and use traceIDs to find trace results.