Collapse envd's own anonymous heap into 2 MiB transparent hugepages before pause, so on resume envd touches fewer distinct guest-physical frames (each a cold fault). Best-effort.

curl --request POST \
  --url https://sandbox.{domain}/collapse \
  --header 'E2b-Sandbox-Id: <e2b-sandbox-id>' \
  --header 'E2b-Sandbox-Port: <e2b-sandbox-port>' \
  --header 'X-Access-Token: <api-key>'

import requests

url = "https://sandbox.{domain}/collapse"

headers = {
    "E2b-Sandbox-Id": "<e2b-sandbox-id>",
    "E2b-Sandbox-Port": "<e2b-sandbox-port>",
    "X-Access-Token": "<api-key>"
}

response = requests.post(url, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'E2b-Sandbox-Id': '<e2b-sandbox-id>',
    'E2b-Sandbox-Port': '<e2b-sandbox-port>',
    'X-Access-Token': '<api-key>'
  }
};

fetch('https://sandbox.{domain}/collapse', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://sandbox.{domain}/collapse",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_HTTPHEADER => [
    "E2b-Sandbox-Id: <e2b-sandbox-id>",
    "E2b-Sandbox-Port: <e2b-sandbox-port>",
    "X-Access-Token: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://sandbox.{domain}/collapse"

	req, _ := http.NewRequest("POST", url, nil)

	req.Header.Add("E2b-Sandbox-Id", "<e2b-sandbox-id>")
	req.Header.Add("E2b-Sandbox-Port", "<e2b-sandbox-port>")
	req.Header.Add("X-Access-Token", "<api-key>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://sandbox.{domain}/collapse")
  .header("E2b-Sandbox-Id", "<e2b-sandbox-id>")
  .header("E2b-Sandbox-Port", "<e2b-sandbox-port>")
  .header("X-Access-Token", "<api-key>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://sandbox.{domain}/collapse")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["E2b-Sandbox-Id"] = '<e2b-sandbox-id>'
request["E2b-Sandbox-Port"] = '<e2b-sandbox-port>'
request["X-Access-Token"] = '<api-key>'

response = http.request(request)
puts response.read_body

{
  "regions": 123,
  "chunks": 123,
  "collapsed": 123,
  "alreadyHuge": 123,
  "skipped": 123,
  "elapsedMs": 123
}

{
  "message": "error opening file '/home/user/file.txt': permission denied",
  "code": 500
}

{
  "message": "<string>",
  "code": 123,
  "sandboxID": "<string>"
}