faastjs
Version:
Serverless batch computing made simple.
582 lines • 83.1 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.CostAnalyzer = exports.CostSnapshot = exports.CostMetric = void 0;
const tslib_1 = require("tslib");
const listr_1 = tslib_1.__importDefault(require("listr"));
const util_1 = require("util");
const index_1 = require("../index");
const shared_1 = require("./shared");
const throttle_1 = require("./throttle");
/**
* A line item in the cost estimate, including the resource usage metric
* measured and its pricing.
* @public
*/
class CostMetric {
/** @internal */
constructor(arg) {
this.name = arg.name;
this.pricing = arg.pricing;
this.unit = arg.unit;
this.measured = arg.measured;
this.unitPlural = arg.unitPlural;
this.comment = arg.comment;
this.informationalOnly = arg.informationalOnly;
}
/**
* The cost contribution of this cost metric. Equal to
* {@link CostMetric.pricing} * {@link CostMetric.measured}.
*/
cost() {
return this.pricing * this.measured;
}
/**
* Return a string with the cost estimate for this metric, omitting
* comments.
*/
describeCostOnly() {
const p = (n, precision = 8) => Number.isInteger(n) ? String(n) : n.toFixed(precision);
const getUnit = (n) => {
if (n > 1) {
return (this.unitPlural ||
(!this.unit.match(/[A-Z]$/) ? this.unit + "s" : this.unit));
}
else {
return this.unit;
}
};
const cost = `$${p(this.cost())}`;
const pricing = `$${p(this.pricing)}/${this.unit}`;
const metric = p(this.measured, this.unit === "second" ? 1 : 8);
const unit = getUnit(this.measured);
return `${this.name.padEnd(21)} ${pricing.padEnd(20)} ${metric.padStart(12)} ${unit.padEnd(10)} ${cost.padEnd(14)}`;
}
/** Describe this cost metric, including comments. */
toString() {
return `${this.describeCostOnly()}${(this.comment && `// ${this.comment}`) || ""}`;
}
}
exports.CostMetric = CostMetric;
/**
* A summary of the costs incurred by a faast.js module at a point in time.
* Output of {@link FaastModule.costSnapshot}.
* @remarks
* Cost information provided by faast.js is an estimate. It is derived from
* internal faast.js measurements and not by consulting data provided by your
* cloud provider.
*
* **Faast.js does not guarantee the accuracy of cost estimates.**
*
* **Use at your own risk.**
*
* Example using AWS:
* ```typescript
* const faastModule = await faast("aws", m);
* try {
* // Invoke faastModule.functions.*
* } finally {
* await faastModule.cleanup();
* console.log(`Cost estimate:`);
* console.log(`${await faastModule.costSnapshot()}`);
* }
* ```
*
* AWS example output:
* ```text
* Cost estimate:
* functionCallDuration $0.00002813/second 0.6 second $0.00001688 68.4% [1]
* sqs $0.00000040/request 9 requests $0.00000360 14.6% [2]
* sns $0.00000050/request 5 requests $0.00000250 10.1% [3]
* functionCallRequests $0.00000020/request 5 requests $0.00000100 4.1% [4]
* outboundDataTransfer $0.09000000/GB 0.00000769 GB $0.00000069 2.8% [5]
* logIngestion $0.50000000/GB 0 GB $0 0.0% [6]
* ---------------------------------------------------------------------------------------
* $0.00002467 (USD)
*
* * Estimated using highest pricing tier for each service. Limitations apply.
* ** Does not account for free tier.
* [1]: https://aws.amazon.com/lambda/pricing (rate = 0.00001667/(GB*second) * 1.6875 GB = 0.00002813/second)
* [2]: https://aws.amazon.com/sqs/pricing
* [3]: https://aws.amazon.com/sns/pricing
* [4]: https://aws.amazon.com/lambda/pricing
* [5]: https://aws.amazon.com/ec2/pricing/on-demand/#Data_Transfer
* [6]: https://aws.amazon.com/cloudwatch/pricing/ - Log ingestion costs not currently included.
* ```
*
* A cost snapshot contains several {@link CostMetric} values. Each `CostMetric`
* summarizes one component of the overall cost of executing the functions so
* far. Some cost metrics are common to all faast providers, and other metrics
* are provider-specific. The common metrics are:
*
* - `functionCallDuration`: the estimated billed CPU time (rounded to the next
* 100ms) consumed by completed cloud function calls. This is the metric that
* usually dominates cost.
*
* - `functionCallRequests`: the number of invocation requests made. Most
* providers charge for each invocation.
*
* Provider-specific metrics vary. For example, AWS has the following additional
* metrics:
*
* - `sqs`: AWS Simple Queueing Service. This metric captures the number of
* queue requests made to insert and retrieve queued results (each 64kb chunk
* is counted as an additional request). SQS is used even if
* {@link CommonOptions.mode} is not set to `"queue"`, because it is necessary
* for monitoring cloud function invocations.
*
* - `sns`: AWS Simple Notification Service. SNS is used to invoke Lambda
* functions when {@link CommonOptions.mode} is `"queue"`.
*
* - `outboundDataTransfer`: an estimate of the network data transferred out
* from the cloud provider for this faast.js module. This estimate only counts
* data returned from cloud function invocations and infrastructure that
* faast.js sets up. It does not count any outbound data sent by your cloud
* functions that are not known to faast.js. Note that if you run faast.js on
* EC2 in the same region (see {@link AwsOptions.region}), then the data
* transfer costs will be zero (however, the cost snapshot will not include
* EC2 costs). Also note that if your cloud function transfers data from/to S3
* buckets in the same region, there is no cost as long as that data is not
* returned from the function.
*
* - `logIngestion`: this cost metric is always zero for AWS. It is present to
* remind the user that AWS charges for log data ingested by CloudWatch Logs
* that are not measured by faast.js. Log entries may arrive significantly
* after function execution completes, and there is no way for faast.js to
* know exactly how long to wait, therefore it does not attempt to measure
* this cost. In practice, if your cloud functions do not perform extensive
* logging on all invocations, log ingestion costs from faast.js are likely to
* be low or fall within the free tier.
*
* The Local provider has no extra metrics.
*
* Prices are retrieved dynamically from AWS and cached locally.
* Cached prices expire after 24h. For each cost metric, faast.js uses the
* highest price tier to compute estimated pricing.
*
* Cost estimates do not take free tiers into account.
* @public
*/
class CostSnapshot {
/** @internal */
constructor(
/** The {@link Provider}, e.g. "aws" */
provider,
/**
* The options used to initialize the faast.js module where this cost
* snapshot was generated.
*/
options, stats, costMetrics = []) {
this.provider = provider;
this.options = options;
/**
* The cost metric components for this cost snapshot. See
* {@link CostMetric}.
*/
this.costMetrics = [];
this.stats = stats.clone();
this.costMetrics = [...costMetrics];
}
/** Sum of cost metrics. */
total() {
return (0, shared_1.sum)(this.costMetrics.map(metric => metric.cost()));
}
/** A summary of all cost metrics and prices in this cost snapshot. */
toString() {
let rv = "";
this.costMetrics.sort((a, b) => b.cost() - a.cost());
const total = this.total();
const comments = [];
const percent = (entry) => ((entry.cost() / total) * 100).toFixed(1).padStart(5) + "% ";
for (const entry of this.costMetrics) {
let commentIndex = "";
if (entry.comment) {
comments.push(entry.comment);
commentIndex = ` [${comments.length}]`;
}
rv += `${entry.describeCostOnly()}${percent(entry)}${commentIndex}\n`;
}
rv +=
"---------------------------------------------------------------------------------------\n";
rv += `$${this.total().toFixed(8)}`.padStart(78) + " (USD)\n\n";
rv += ` * Estimated using highest pricing tier for each service. Limitations apply.\n`;
rv += ` ** Does not account for free tier.\n`;
rv += comments.map((c, i) => `[${i + 1}]: ${c}`).join("\n");
return rv;
}
/**
* Comma separated value output for a cost snapshot.
* @remarks
* The format is "metric,unit,pricing,measured,cost,percentage,comment".
*
* Example output:
* ```text
* metric,unit,pricing,measured,cost,percentage,comment
* functionCallDuration,second,0.00002813,0.60000000,0.00001688,64.1% ,"https://aws.amazon.com/lambda/pricing (rate = 0.00001667/(GB*second) * 1.6875 GB = 0.00002813/second)"
* functionCallRequests,request,0.00000020,5,0.00000100,3.8% ,"https://aws.amazon.com/lambda/pricing"
* outboundDataTransfer,GB,0.09000000,0.00000844,0.00000076,2.9% ,"https://aws.amazon.com/ec2/pricing/on-demand/#Data_Transfer"
* sqs,request,0.00000040,13,0.00000520,19.7% ,"https://aws.amazon.com/sqs/pricing"
* sns,request,0.00000050,5,0.00000250,9.5% ,"https://aws.amazon.com/sns/pricing"
* logIngestion,GB,0.50000000,0,0,0.0% ,"https://aws.amazon.com/cloudwatch/pricing/ - Log ingestion costs not currently included."
* ```
*/
csv() {
let rv = "";
rv += "metric,unit,pricing,measured,cost,percentage,comment\n";
const total = this.total();
const p = (n) => (Number.isInteger(n) ? n : n.toFixed(8));
const percent = (entry) => ((entry.cost() / total) * 100).toFixed(1) + "% ";
for (const entry of this.costMetrics) {
rv += `${entry.name},${entry.unit},${p(entry.pricing)},${p(entry.measured)},${p(entry.cost())},${percent(entry)},"${(entry.comment || "").replace('"', '""')}"\n`;
}
return rv;
}
/** @internal */
push(metric) {
this.costMetrics.push(metric);
}
/**
* Find a specific cost metric by name.
* @returns a {@link CostMetric} if found, otherwise `undefined`.
*/
find(name) {
return this.costMetrics.find(m => m.name === name);
}
}
exports.CostSnapshot = CostSnapshot;
/**
* Analyze the cost of a workload across many provider configurations.
* @public
*/
var CostAnalyzer;
(function (CostAnalyzer) {
/**
* Default AWS cost analyzer configurations include all memory sizes for AWS
* Lambda.
* @remarks
* The default AWS cost analyzer configurations include every memory size
* from 128MB to 3008MB in 64MB increments. Each configuration has the
* following settings:
*
* ```typescript
* {
* provider: "aws",
* options: {
* mode: "https",
* memorySize,
* timeout: 300,
* gc: "off",
* childProcess: true
* }
* }
* ```
*
* Use `Array.map` to change or `Array.filter` to remove some of these
* configurations. For example:
*
* ```typescript
* const configsWithAtLeast1GB = awsConfigurations.filter(c => c.memorySize > 1024)
* const shorterTimeout = awsConfigurations.map(c => ({...c, timeout: 60 }));
* ```
* @public
*/
CostAnalyzer.awsConfigurations = (() => {
const rv = [];
for (let memorySize = 128; memorySize <= 3008; memorySize += 64) {
rv.push({
provider: "aws",
options: {
mode: "https",
memorySize,
timeout: 300,
gc: "off",
childProcess: true
}
});
}
return rv;
})();
const workloadDefaults = {
configurations: CostAnalyzer.awsConfigurations,
summarize: summarizeMean,
format: defaultFormat,
formatCSV: defaultFormatCSV,
silent: false,
repetitions: 10,
concurrency: 64
};
function defaultFormat(attr, value) {
return `${attr}:${(0, shared_1.f1)(value)}`;
}
function defaultFormatCSV(_, value) {
return (0, shared_1.f1)(value);
}
const ps = (n) => (n / 1000).toFixed(3);
function summarizeMean(attributes) {
const stats = {};
attributes.forEach(a => (0, shared_1.keysOf)(a).forEach(attr => {
if (!(attr in stats)) {
stats[attr] = new shared_1.Statistics();
}
stats[attr].update(a[attr]);
}));
const result = {};
(0, shared_1.keysOf)(stats).forEach(attr => {
result[attr] = stats[attr].mean;
});
return result;
}
async function estimate(workload, config) {
const { provider, options } = config;
const faastModule = await (0, index_1.faast)(provider, workload.funcs, options);
const { repetitions, concurrency: repetitionConcurrency } = workload;
const doWork = (0, throttle_1.throttle)({ concurrency: repetitionConcurrency }, workload.work);
const results = [];
for (let i = 0; i < repetitions; i++) {
results.push(doWork(faastModule).catch(_ => { }));
}
const rv = (await Promise.all(results)).filter(r => r);
await faastModule.cleanup();
const costSnapshot = await faastModule.costSnapshot();
const extraMetrics = workload.summarize(rv);
return { costSnapshot, config, extraMetrics };
}
/**
* Estimate the cost of a workload using multiple configurations and
* providers.
* @param userWorkload - a {@link CostAnalyzer.Workload} object specifying
* the workload to run and additional parameters.
* @returns A promise for a {@link CostAnalyzer.Result}
* @public
* @remarks
* It can be deceptively difficult to set optimal parameters for AWS Lambda
* and similar services. On the surface there appears to be only one
* parameter: memory size. Choosing more memory also gives more CPU
* performance, but it's unclear how much. It's also unclear where single
* core performance stops getting better. The workload cost analyzer solves
* these problems by making it easy to run cost experiments.
* ```text
* (AWS)
* ┌───────┐
* ┌────▶│ 128MB │
* │ └───────┘
* │ ┌───────┐
* ┌─────────────────┐ ├────▶│ 256MB │
* ┌──────────────┐ │ │ │ └───────┘
* │ workload │───▶│ │ │ ...
* └──────────────┘ │ │ │ ┌───────┐
* │ cost analyzer │─────┼────▶│3008MB │
* ┌──────────────┐ │ │ └───────┘
* │configurations│───▶│ │
* └──────────────┘ │ │
* └─────────────────┘
*
* ```
* `costAnalyzer` is the entry point. It automatically runs this workload
* against multiple configurations in parallel. Then it uses faast.js' cost
* snapshot mechanism to automatically determine the price of running the
* workload with each configuration.
*
* Example:
*
* ```typescript
* // functions.ts
* export function randomNumbers(n: number) {
* let sum = 0;
* for (let i = 0; i < n; i++) {
* sum += Math.random();
* }
* return sum;
* }
*
* // cost-analyzer-example.ts
* import { writeFileSync } from "fs";
* import { CostAnalyzer, FaastModule } from "faastjs";
* import * as funcs from "./functions";
*
* async function work(faastModule: FaastModule<typeof funcs>) {
* await faastModule.functions.randomNumbers(100000000);
* }
*
* async function main() {
* const results = await CostAnalyzer.analyze({ funcs, work });
* writeFileSync("cost.csv", results.csv());
* }
*
* main();
* ```
*
* Example output (this is printed to `console.log` unless the
* {@link CostAnalyzer.Workload.silent} is `true`):
* ```text
* ✔ aws 128MB queue 15.385s 0.274σ $0.00003921
* ✔ aws 192MB queue 10.024s 0.230σ $0.00003576
* ✔ aws 256MB queue 8.077s 0.204σ $0.00003779
* ▲ ▲ ▲ ▲ ▲ ▲
* │ │ │ │ │ │
* provider │ mode │ stdev average
* │ │ execution estimated
* memory │ time cost
* size │
* average cloud
* execution time
* ```
*
* The output lists the provider, memory size, ({@link CommonOptions.mode}),
* average time of a single execution of the workload, the standard
* deviation (in seconds) of the execution time, and average estimated cost
* for a single run of the workload.
*
* The "execution time" referenced here is not wall clock time, but rather
* execution time in the cloud function. The execution time does not include
* any time the workload spends waiting locally. If the workload invokes
* multiple cloud functions, their execution times will be summed even if
* they happen concurrently. This ensures the execution time and cost are
* aligned.
*/
async function analyze(userWorkload) {
const scheduleEstimate = (0, throttle_1.throttle)({
concurrency: 8,
rate: 4,
burst: 1,
retry: 3
}, estimate);
const { concurrency = workloadDefaults.concurrency } = userWorkload;
const workload = {
...workloadDefaults,
...userWorkload,
work: (0, throttle_1.throttle)({ concurrency }, userWorkload.work)
};
const { configurations } = workload;
const promises = configurations.map(config => scheduleEstimate(workload, config));
const format = workload.format || defaultFormat;
const renderer = workload.silent ? "silent" : "default";
const list = new listr_1.default(promises.map((promise, i) => {
const { provider, options } = configurations[i];
const { memorySize, mode } = options;
return {
title: `${provider} ${memorySize}MB ${mode}`,
task: async (_, task) => {
const { costSnapshot, extraMetrics } = await promise;
const total = (costSnapshot.total() / workload.repetitions).toFixed(8);
const { errors } = costSnapshot.stats;
const { executionTime } = costSnapshot.stats;
const message = `${ps(executionTime.mean)}s ${ps(executionTime.stdev)}σ $${total}`;
const errMessage = errors > 0 ? ` (${errors} errors)` : "";
const extra = (0, shared_1.keysOf)(extraMetrics)
.map(k => format(k, extraMetrics[k]))
.join(" ");
task.title = `${task.title} ${message}${errMessage} ${extra}`;
}
};
}), { concurrent: 8, nonTTYRenderer: renderer, renderer });
await list.run();
const results = await Promise.all(promises);
results.sort((a, b) => a.costSnapshot.options.memorySize - b.costSnapshot.options.memorySize);
return new Result(workload, results);
}
CostAnalyzer.analyze = analyze;
/**
* Cost analyzer results for each workload and configuration.
* @remarks
* The `estimates` property has the cost estimates for each configuration.
* See {@link CostAnalyzer.Estimate}.
* @public
*/
class Result {
/** @internal */
constructor(
/** The workload analyzed. */
workload,
/**
* Cost estimates for each configuration of the workload. See
* {@link CostAnalyzer.Estimate}.
*/
estimates) {
this.workload = workload;
this.estimates = estimates;
}
/**
* Comma-separated output of cost analyzer. One line per cost analyzer
* configuration.
* @remarks
* The columns are:
*
* - `memory`: The memory size allocated.
*
* - `cloud`: The cloud provider.
*
* - `mode`: See {@link CommonOptions.mode}.
*
* - `options`: A string summarizing other faast.js options applied to the
* `workload`. See {@link CommonOptions}.
*
* - `completed`: Number of repetitions that successfully completed.
*
* - `errors`: Number of invocations that failed.
*
* - `retries`: Number of retries that were attempted.
*
* - `cost`: The average cost of executing the workload once.
*
* - `executionTime`: the aggregate time spent executing on the provider for
* all cloud function invocations in the workload. This is averaged across
* repetitions.
*
* - `executionTimeStdev`: The standard deviation of `executionTime`.
*
* - `billedTime`: the same as `exectionTime`, except rounded up to the next
* 100ms for each invocation. Usually very close to `executionTime`.
*/
csv() {
const attributes = new Set();
this.estimates.forEach(est => (0, shared_1.keysOf)(est.extraMetrics).forEach(key => attributes.add(key)));
const columns = [
"memory",
"cloud",
"mode",
"options",
"completed",
"errors",
"retries",
"cost",
"executionTime",
"executionTimeStdev",
"billedTime",
...attributes
];
let rv = columns.join(",") + "\n";
this.estimates.forEach(({ costSnapshot, extraMetrics }) => {
const { memorySize, mode, ...rest } = costSnapshot.options;
const options = `"${(0, util_1.inspect)(rest).replace('"', '""')}"`;
const { completed, errors, retries, executionTime, estimatedBilledTime } = costSnapshot.stats;
const cost = (costSnapshot.total() / this.workload.repetitions).toFixed(8);
const formatter = this.workload.formatCSV || defaultFormatCSV;
const metrics = {};
for (const attr of attributes) {
metrics[attr] = formatter(attr, extraMetrics[attr]);
}
const row = {
memory: memorySize,
cloud: costSnapshot.provider,
mode,
options,
completed,
errors,
retries,
cost: `$${cost}`,
executionTime: ps(executionTime.mean),
executionTimeStdev: ps(executionTime.stdev),
billedTime: ps(estimatedBilledTime.mean),
...metrics
};
rv += (0, shared_1.keysOf)(row)
.map(k => String(row[k]))
.join(",");
rv += "\n";
});
return rv;
}
}
CostAnalyzer.Result = Result;
})(CostAnalyzer || (exports.CostAnalyzer = CostAnalyzer = {}));
//# 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Listr from \"listr\";\nimport { inspect } from \"util\";\nimport { faast, FaastModule } from \"../index\";\nimport { AwsOptions } from \"./aws/aws-faast\";\nimport { FunctionStats, CommonOptions } from \"./provider\";\nimport { f1, keysOf, Statistics, sum } from \"./shared\";\nimport { throttle } from \"./throttle\";\nimport { PropertiesExcept, AnyFunction } from \"./types\";\n\n/**\n * A line item in the cost estimate, including the resource usage metric\n * measured and its pricing.\n * @public\n */\nexport class CostMetric {\n    /** The name of the cost metric, e.g. `functionCallDuration` */\n    readonly name: string;\n    /** The price in USD per unit measured. */\n    readonly pricing: number;\n    /** The name of the units that pricing is measured in for this metric. */\n    readonly unit: string;\n    /** The measured value of the cost metric, in units. */\n    readonly measured: number;\n    /**\n     * The plural form of the unit name. By default the plural form will be the\n     * name of the unit with \"s\" appended at the end, unless the last letter is\n     * capitalized, in which case there is no plural form (e.g. \"GB\").\n     */\n    readonly unitPlural?: string;\n    /**\n     * An optional comment, usually providing a link to the provider's pricing\n     * page and other data.\n     */\n    readonly comment?: string;\n    /**\n     * True if this cost metric is only for informational purposes (e.g. AWS's\n     * `logIngestion`) and does not contribute cost.\n     */\n    readonly informationalOnly?: boolean;\n\n    /** @internal */\n    constructor(arg: PropertiesExcept<CostMetric, AnyFunction>) {\n        this.name = arg.name;\n        this.pricing = arg.pricing;\n        this.unit = arg.unit;\n        this.measured = arg.measured;\n        this.unitPlural = arg.unitPlural;\n        this.comment = arg.comment;\n        this.informationalOnly = arg.informationalOnly;\n    }\n\n    /**\n     * The cost contribution of this cost metric. Equal to\n     * {@link CostMetric.pricing} * {@link CostMetric.measured}.\n     */\n    cost() {\n        return this.pricing * this.measured;\n    }\n\n    /**\n     * Return a string with the cost estimate for this metric, omitting\n     * comments.\n     */\n    describeCostOnly() {\n        const p = (n: number, precision = 8) =>\n            Number.isInteger(n) ? String(n) : n.toFixed(precision);\n        const getUnit = (n: number) => {\n            if (n > 1) {\n                return (\n                    this.unitPlural ||\n                    (!this.unit.match(/[A-Z]$/) ? this.unit + \"s\" : this.unit)\n                );\n            } else {\n                return this.unit;\n            }\n        };\n\n        const cost = `$${p(this.cost())}`;\n        const pricing = `$${p(this.pricing)}/${this.unit}`;\n        const metric = p(this.measured, this.unit === \"second\" ? 1 : 8);\n        const unit = getUnit(this.measured);\n\n        return `${this.name.padEnd(21)} ${pricing.padEnd(20)} ${metric.padStart(\n            12\n        )} ${unit.padEnd(10)} ${cost.padEnd(14)}`;\n    }\n\n    /** Describe this cost metric, including comments. */\n    toString() {\n        return `${this.describeCostOnly()}${\n            (this.comment && `// ${this.comment}`) || \"\"\n        }`;\n    }\n}\n\n/**\n * A summary of the costs incurred by a faast.js module at a point in time.\n * Output of {@link FaastModule.costSnapshot}.\n * @remarks\n * Cost information provided by faast.js is an estimate. It is derived from\n * internal faast.js measurements and not by consulting data provided by your\n * cloud provider.\n *\n * **Faast.js does not guarantee the accuracy of cost estimates.**\n *\n * **Use at your own risk.**\n *\n * Example using AWS:\n * ```typescript\n * const faastModule = await faast(\"aws\", m);\n * try {\n *     // Invoke faastModule.functions.*\n * } finally {\n *     await faastModule.cleanup();\n *     console.log(`Cost estimate:`);\n *     console.log(`${await faastModule.costSnapshot()}`);\n * }\n * ```\n *\n * AWS example output:\n * ```text\n * Cost estimate:\n * functionCallDuration  $0.00002813/second            0.6 second     $0.00001688    68.4%  [1]\n * sqs                   $0.00000040/request             9 requests   $0.00000360    14.6%  [2]\n * sns                   $0.00000050/request             5 requests   $0.00000250    10.1%  [3]\n * functionCallRequests  $0.00000020/request             5 requests   $0.00000100     4.1%  [4]\n * outboundDataTransfer  $0.09000000/GB         0.00000769 GB         $0.00000069     2.8%  [5]\n * logIngestion          $0.50000000/GB                  0 GB         $0              0.0%  [6]\n * ---------------------------------------------------------------------------------------\n *                                                                    $0.00002467 (USD)\n *\n *   * Estimated using highest pricing tier for each service. Limitations apply.\n *  ** Does not account for free tier.\n * [1]: https://aws.amazon.com/lambda/pricing (rate = 0.00001667/(GB*second) * 1.6875 GB = 0.00002813/second)\n * [2]: https://aws.amazon.com/sqs/pricing\n * [3]: https://aws.amazon.com/sns/pricing\n * [4]: https://aws.amazon.com/lambda/pricing\n * [5]: https://aws.amazon.com/ec2/pricing/on-demand/#Data_Transfer\n * [6]: https://aws.amazon.com/cloudwatch/pricing/ - Log ingestion costs not currently included.\n * ```\n *\n * A cost snapshot contains several {@link CostMetric} values. Each `CostMetric`\n * summarizes one component of the overall cost of executing the functions so\n * far. Some cost metrics are common to all faast providers, and other metrics\n * are provider-specific. The common metrics are:\n *\n * - `functionCallDuration`: the estimated billed CPU time (rounded to the next\n *   100ms) consumed by completed cloud function calls. This is the metric that\n *   usually dominates cost.\n *\n * - `functionCallRequests`: the number of invocation requests made. Most\n *   providers charge for each invocation.\n *\n * Provider-specific metrics vary. For example, AWS has the following additional\n * metrics:\n *\n * - `sqs`: AWS Simple Queueing Service. This metric captures the number of\n *   queue requests made to insert and retrieve queued results (each 64kb chunk\n *   is counted as an additional request). SQS is used even if\n *   {@link CommonOptions.mode} is not set to `\"queue\"`, because it is necessary\n *   for monitoring cloud function invocations.\n *\n * - `sns`: AWS Simple Notification Service. SNS is used to invoke Lambda\n *   functions when {@link CommonOptions.mode} is `\"queue\"`.\n *\n * - `outboundDataTransfer`: an estimate of the network data transferred out\n *   from the cloud provider for this faast.js module. This estimate only counts\n *   data returned from cloud function invocations and infrastructure that\n *   faast.js sets up. It does not count any outbound data sent by your cloud\n *   functions that are not known to faast.js. Note that if you run faast.js on\n *   EC2 in the same region (see {@link AwsOptions.region}), then the data\n *   transfer costs will be zero (however, the cost snapshot will not include\n *   EC2 costs). Also note that if your cloud function transfers data from/to S3\n *   buckets in the same region, there is no cost as long as that data is not\n *   returned from the function.\n *\n * - `logIngestion`: this cost metric is always zero for AWS. It is present to\n *   remind the user that AWS charges for log data ingested by CloudWatch Logs\n *   that are not measured by faast.js. Log entries may arrive significantly\n *   after function execution completes, and there is no way for faast.js to\n *   know exactly how long to wait, therefore it does not attempt to measure\n *   this cost. In practice, if your cloud functions do not perform extensive\n *   logging on all invocations