wrench::ServerlessStateOfTheSystem

class ServerlessStateOfTheSystem

A class that stores the current state of a serverless compute service.

Public Functions

std::vector<std::shared_ptr<ServerlessComputeNode>> getActivatedComputeNodes() const

Getter for the compute nodes.

Returns:

The compute nodes

std::map<std::shared_ptr<Image>, std::vector<std::shared_ptr<Invocation>>> getAdmittedInvocations() const

Get the list of admitted invocations (whose image layers are not all downloaded from remote).

Returns:

The list of admitted invocations

std::map<std::shared_ptr<ServerlessComputeNode>, sg_size_t> getAvailableDiskSpace() const

Getter for the map of available disk space for activated compute nodes. Note that Disk space is managed in an LRU fashion, so it’s not because a disk is full that nothing can be done, perhaps.

Returns:

The RAM availability map

std::map<std::shared_ptr<ServerlessComputeNode>, sg_size_t> getAvailableRAMSpace() const

Getter for the map of available RAM for activated compute nodes. Note that RAM is managed in an LRU fashion, so it’s not because RAM is full that nothing can be done, perhaps.

Returns:

The RAM availability map

std::set<std::shared_ptr<ImageLayer>> getImageLayersBeingCopiedToNode(const std::shared_ptr<ServerlessComputeNode> &node) const

Get the current image layers being copied to a node.

Parameters:

node – the compute node

Returns:

a set of image files

std::set<std::shared_ptr<ImageLayer>> getImageLayersBeingLoadedAtNode(const std::shared_ptr<ServerlessComputeNode> &node) const

Get the current image layers being loaded into RAM at a node.

Parameters:

node – the compute node

Returns:

a set of image layers

std::set<std::shared_ptr<ImageLayer>> getImageLayersInRAMAtNode(const std::shared_ptr<ServerlessComputeNode> &node) const

Get the current image layers in RAM at a node.

Parameters:

node – the compute node

Returns:

a set of image files

std::set<std::shared_ptr<ImageLayer>> getImageLayersOnDiskAtNode(const std::shared_ptr<ServerlessComputeNode> &node) const

Get the current image layers on disk at a node.

Parameters:

node – the compute node

Returns:

a set of image files

unsigned long getNumBeingActivatedComputeNodes() const

Get the number of deactivated compute nodes.

Returns:

A number of nodes

unsigned long getNumDeactivatedComputeNodes() const

Get the number of deactivated compute nodes.

Returns:

A number of nodes

std::map<std::shared_ptr<Function>, unsigned long> getOutstandingInvocationCounts() const

Get the current per-function outstanding invocation counts.

Returns:

a function-count map

const std::vector<std::shared_ptr<Invocation>> &getSchedulableInvocations() const

Get the list of schedulable invocations.

Returns:

The list of schedulable invocations

bool isImageLayerBeingCopiedToNode(const std::shared_ptr<ServerlessComputeNode> &node, const std::shared_ptr<ImageLayer> &layer) const

Determine whether an image layer is currently being copied to a node.

Parameters:

  • node – the compute node

  • layer – an image layer

Returns:

true or false

bool isImageLayerBeingLoadedAtNode(const std::shared_ptr<ServerlessComputeNode> &node, const std::shared_ptr<ImageLayer> &layer) const

Determine whether an image is currently being loading into RAM at a node.

Parameters:

  • node – the compute node

  • layer – an image layer

Returns:

true or false

bool isImageLayerInRAMAtNode(const std::shared_ptr<ServerlessComputeNode> &node, const std::shared_ptr<ImageLayer> &layer) const

Determine whether an image layer is currently in RAM at a node.

Parameters:

  • node – the compute node

  • layer – an image layer

Returns:

true or false

bool isImageLayerOnDiskAtNode(const std::shared_ptr<ServerlessComputeNode> &node, const std::shared_ptr<ImageLayer> &layer) const

Determine whether an image layer is currently on disk at a node.

Parameters:

  • node – the compute node

  • layer – an image layer

Returns:

true or false