A command line tool for monitoring the CPU and memory usage of a process tree.
Download the binary from the release page and run the following command
$ ps-tree <pid>Of course, you can execute this command in another language and parse the results from stdout.
Here we take nodejs as an example.
const { spawn } = require("child_process");
const readline = require("readline");
const ps = spawn("target/debug/ps-tree", [process.pid], { stdio: "pipe" });
// create a readline interface to read from stdout
const rl = readline.createInterface({
input: ps.stdout,
output: process.stdout,
terminal: false,
});
rl.on("line", (line) => {
try {
const json = JSON.parse(line);
console.log("Received JSON:", json);
} catch (error) {
console.error("Error parsing JSON:", error);
}
});
ps.on("close", (code) => {
console.log(`child process exited with code ${code}`);
});It will output information(JSON format) about the process and its subprocesses.
This is the output JSON field information.
#[derive(Debug, Clone, Serialize)]
pub struct ProcessNode {
pid: SerializablePid,
ppid: SerializablePid,
gid: Option<u32>,
name: String,
cmd: Vec<String>,
cpu_usage: f32,
memory: u64,
#[serde(skip_serializing_if = "Vec::is_empty")]
children: Vec<ProcessNode>,
}See the output example(Pretty)
{
"pid": 90456,
"ppid": 1,
"name": "firefox",
"cmd": [
"/Applications/Firefox Developer Edition.app/Contents/MacOS/firefox",
"-foreground"
],
"cpu_usage": 55.335175,
"memory": 630439936,
"children": [
{
"pid": 3986,
"ppid": 90456,
"name": "plugin-container",
"cmd": [
"/Applications/Firefox Developer Edition.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container",
"-childID",
"179",
"-isForBrowser",
"-prefsLen",
"39653",
"-prefMapSize",
"260845",
"-jsInitLen",
"234780",
"-sbStartup",
"-sbAppPath",
"/Applications/Firefox Developer Edition.app",
"-sbLevel",
"3",
"-parentBuildID",
"20240628091536",
"-greomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/omni.ja",
"-appomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser/omni.ja",
"-appDir",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser",
"-profile",
"/Users/axetroy/Library/Application Support/Firefox/Profiles/9v87tgkr.dev-edition-default",
"{8cfb7fab-033b-4f16-a095-314c8750995b}",
"90456",
"gecko-crash-server-pipe.90456",
"org.mozilla.machname.1820100416",
"tab"
],
"cpu_usage": 0.037370622,
"memory": 122142720,
"children": []
},
{
"pid": 1177,
"ppid": 90456,
"name": "plugin-container",
"cmd": [
"/Applications/Firefox Developer Edition.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container",
"-childID",
"167",
"-isForBrowser",
"-prefsLen",
"39653",
"-prefMapSize",
"260845",
"-jsInitLen",
"234780",
"-sbStartup",
"-sbAppPath",
"/Applications/Firefox Developer Edition.app",
"-sbLevel",
"3",
"-parentBuildID",
"20240628091536",
"-greomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/omni.ja",
"-appomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser/omni.ja",
"-appDir",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser",
"-profile",
"/Users/axetroy/Library/Application Support/Firefox/Profiles/9v87tgkr.dev-edition-default",
"{d17b9d18-aeaa-4023-9b5b-30209926975e}",
"90456",
"gecko-crash-server-pipe.90456",
"org.mozilla.machname.525245542",
"tab"
],
"cpu_usage": 0.035160605,
"memory": 84049920,
"children": []
},
{
"pid": 90768,
"ppid": 90456,
"name": "plugin-container",
"cmd": [
"/Applications/Firefox Developer Edition.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container",
"-childID",
"38",
"-isForBrowser",
"-prefsLen",
"37436",
"-prefMapSize",
"260845",
"-jsInitLen",
"234780",
"-sbStartup",
"-sbAppPath",
"/Applications/Firefox Developer Edition.app",
"-sbLevel",
"3",
"-parentBuildID",
"20240628091536",
"-greomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/omni.ja",
"-appomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser/omni.ja",
"-appDir",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser",
"-profile",
"/Users/axetroy/Library/Application Support/Firefox/Profiles/9v87tgkr.dev-edition-default",
"{fda829c2-98ab-47ab-91bf-6041cab70e7d}",
"90456",
"gecko-crash-server-pipe.90456",
"org.mozilla.machname.138077800",
"tab"
],
"cpu_usage": 0.026068395,
"memory": 84328448,
"children": []
},
{
"pid": 18917,
"ppid": 90456,
"name": "plugin-container",
"cmd": [
"/Applications/Firefox Developer Edition.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container",
"-childID",
"368",
"-isForBrowser",
"-prefsLen",
"39666",
"-prefMapSize",
"260845",
"-jsInitLen",
"234780",
"-sbStartup",
"-sbAppPath",
"/Applications/Firefox Developer Edition.app",
"-sbLevel",
"3",
"-parentBuildID",
"20240628091536",
"-greomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/omni.ja",
"-appomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser/omni.ja",
"-appDir",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser",
"-profile",
"/Users/axetroy/Library/Application Support/Firefox/Profiles/9v87tgkr.dev-edition-default",
"{caeca1f5-eb0b-4958-91c2-354275d3b4dd}",
"90456",
"gecko-crash-server-pipe.90456",
"org.mozilla.machname.1666781175",
"tab"
],
"cpu_usage": 0.053164806,
"memory": 102809600,
"children": []
},
{
"pid": 90477,
"ppid": 90456,
"name": "plugin-container",
"cmd": [
"/Applications/Firefox Developer Edition.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container",
"-parentBuildID",
"20240628091536",
"-sandboxingKind",
"0",
"-prefsLen",
"42764",
"-prefMapSize",
"260845",
"-sbStartup",
"-sbAppPath",
"/Applications/Firefox Developer Edition.app",
"-appDir",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser",
"-profile",
"/Users/axetroy/Library/Application Support/Firefox/Profiles/9v87tgkr.dev-edition-default",
"{91974483-30ae-455d-8999-490faf0a4f34}",
"90456",
"gecko-crash-server-pipe.90456",
"org.mozilla.machname.1240446945",
"utility"
],
"cpu_usage": 0.62631416,
"memory": 23003136,
"children": []
},
{
"pid": 90487,
"ppid": 90456,
"name": "plugin-container",
"cmd": [
"/Applications/Firefox Developer Edition.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container",
"-parentBuildID",
"20240628091536",
"-prefsLen",
"42773",
"-prefMapSize",
"260845",
"-sbStartup",
"-sbAppPath",
"/Applications/Firefox Developer Edition.app",
"-appDir",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser",
"-profile",
"/Users/axetroy/Library/Application Support/Firefox/Profiles/9v87tgkr.dev-edition-default",
"{baeba8de-89c7-404a-bbe6-20ac90755982}",
"90456",
"gecko-crash-server-pipe.90456",
"org.mozilla.machname.677020745",
"rdd"
],
"cpu_usage": 1.362366,
"memory": 27574272,
"children": []
},
{
"pid": 90468,
"ppid": 90456,
"name": "plugin-container",
"cmd": [
"/Applications/Firefox Developer Edition.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container",
"-childID",
"2",
"-isForBrowser",
"-prefsLen",
"38005",
"-prefMapSize",
"260845",
"-jsInitLen",
"234780",
"-sbStartup",
"-sbAppPath",
"/Applications/Firefox Developer Edition.app",
"-sbLevel",
"3",
"-parentBuildID",
"20240628091536",
"-greomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/omni.ja",
"-appomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser/omni.ja",
"-appDir",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser",
"-profile",
"/Users/axetroy/Library/Application Support/Firefox/Profiles/9v87tgkr.dev-edition-default",
"{4d25d7af-704b-498d-a5bf-87b3c8382c20}",
"90456",
"gecko-crash-server-pipe.90456",
"org.mozilla.machname.1459792234",
"tab"
],
"cpu_usage": 0.0662963,
"memory": 76496896,
"children": []
},
{
"pid": 90467,
"ppid": 90456,
"name": "plugin-container",
"cmd": [
"/Applications/Firefox Developer Edition.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container",
"-childID",
"1",
"-isForBrowser",
"-prefsLen",
"37045",
"-prefMapSize",
"260845",
"-jsInitLen",
"234780",
"-sbStartup",
"-sbAppPath",
"/Applications/Firefox Developer Edition.app",
"-sbLevel",
"3",
"-parentBuildID",
"20240628091536",
"-greomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/omni.ja",
"-appomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser/omni.ja",
"-appDir",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser",
"-profile",
"/Users/axetroy/Library/Application Support/Firefox/Profiles/9v87tgkr.dev-edition-default",
"{900ab35b-4440-4bb6-85df-22db4cb2a5d1}",
"90456",
"gecko-crash-server-pipe.90456",
"org.mozilla.machname.1201641736",
"tab"
],
"cpu_usage": 0.7343334,
"memory": 422739968,
"children": []
},
{
"pid": 19554,
"ppid": 90456,
"name": "plugin-container",
"cmd": [
"/Applications/Firefox Developer Edition.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container",
"-childID",
"383",
"-isForBrowser",
"-prefsLen",
"39709",
"-prefMapSize",
"260845",
"-jsInitLen",
"234780",
"-sbStartup",
"-sbAppPath",
"/Applications/Firefox Developer Edition.app",
"-sbLevel",
"3",
"-parentBuildID",
"20240628091536",
"-greomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/omni.ja",
"-appomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser/omni.ja",
"-appDir",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser",
"-profile",
"/Users/axetroy/Library/Application Support/Firefox/Profiles/9v87tgkr.dev-edition-default",
"{9d7a854f-dcc8-4d18-989e-5d9183a9ab39}",
"90456",
"gecko-crash-server-pipe.90456",
"org.mozilla.machname.1480076382",
"tab"
],
"cpu_usage": 0.028861377,
"memory": 100073472,
"children": []
},
{
"pid": 90488,
"ppid": 90456,
"name": "plugin-container",
"cmd": [
"/Applications/Firefox Developer Edition.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container",
"-parentBuildID",
"20240628091536",
"-sandboxingKind",
"1",
"-prefsLen",
"42773",
"-prefMapSize",
"260845",
"-sbStartup",
"-sbAppPath",
"/Applications/Firefox Developer Edition.app",
"-appDir",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser",
"-profile",
"/Users/axetroy/Library/Application Support/Firefox/Profiles/9v87tgkr.dev-edition-default",
"{6d897372-8670-4780-b498-17e437710865}",
"90456",
"gecko-crash-server-pipe.90456",
"org.mozilla.machname.1747653525",
"utility"
],
"cpu_usage": 0.5848247,
"memory": 20938752,
"children": []
},
{
"pid": 90676,
"ppid": 90456,
"name": "plugin-container",
"cmd": [
"/Applications/Firefox Developer Edition.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container",
"-childID",
"30",
"-isForBrowser",
"-prefsLen",
"37436",
"-prefMapSize",
"260845",
"-jsInitLen",
"234780",
"-sbStartup",
"-sbAppPath",
"/Applications/Firefox Developer Edition.app",
"-sbLevel",
"3",
"-parentBuildID",
"20240628091536",
"-greomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/omni.ja",
"-appomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser/omni.ja",
"-appDir",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser",
"-profile",
"/Users/axetroy/Library/Application Support/Firefox/Profiles/9v87tgkr.dev-edition-default",
"{29ce4454-1afe-467e-bfa6-e7cba4e8170d}",
"90456",
"gecko-crash-server-pipe.90456",
"org.mozilla.machname.1312829391",
"tab"
],
"cpu_usage": 0.07853348,
"memory": 88260608,
"children": []
},
{
"pid": 28223,
"ppid": 90456,
"name": "plugin-container",
"cmd": [
"/Applications/Firefox Developer Edition.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container",
"-childID",
"388",
"-isForBrowser",
"-prefsLen",
"39709",
"-prefMapSize",
"260845",
"-jsInitLen",
"234780",
"-sbStartup",
"-sbAppPath",
"/Applications/Firefox Developer Edition.app",
"-sbLevel",
"3",
"-parentBuildID",
"20240628091536",
"-greomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/omni.ja",
"-appomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser/omni.ja",
"-appDir",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser",
"-profile",
"/Users/axetroy/Library/Application Support/Firefox/Profiles/9v87tgkr.dev-edition-default",
"{9d88f704-9a6d-4ce6-b937-df483965c9c6}",
"90456",
"gecko-crash-server-pipe.90456",
"org.mozilla.machname.82165909",
"tab"
],
"cpu_usage": 0.0057585686,
"memory": 44548096,
"children": []
},
{
"pid": 18914,
"ppid": 90456,
"name": "plugin-container",
"cmd": [
"/Applications/Firefox Developer Edition.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container",
"-childID",
"367",
"-isForBrowser",
"-prefsLen",
"39666",
"-prefMapSize",
"260845",
"-jsInitLen",
"234780",
"-sbStartup",
"-sbAppPath",
"/Applications/Firefox Developer Edition.app",
"-sbLevel",
"3",
"-parentBuildID",
"20240628091536",
"-greomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/omni.ja",
"-appomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser/omni.ja",
"-appDir",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser",
"-profile",
"/Users/axetroy/Library/Application Support/Firefox/Profiles/9v87tgkr.dev-edition-default",
"{fa7b927c-db99-4a2c-8a60-f17d14595e03}",
"90456",
"gecko-crash-server-pipe.90456",
"org.mozilla.machname.813284007",
"tab"
],
"cpu_usage": 49.548267,
"memory": 779223040,
"children": []
},
{
"pid": 25661,
"ppid": 90456,
"name": "plugin-container",
"cmd": [
"/Applications/Firefox Developer Edition.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container",
"-childID",
"386",
"-isForBrowser",
"-prefsLen",
"39709",
"-prefMapSize",
"260845",
"-jsInitLen",
"234780",
"-sbStartup",
"-sbAppPath",
"/Applications/Firefox Developer Edition.app",
"-sbLevel",
"3",
"-parentBuildID",
"20240628091536",
"-greomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/omni.ja",
"-appomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser/omni.ja",
"-appDir",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser",
"-profile",
"/Users/axetroy/Library/Application Support/Firefox/Profiles/9v87tgkr.dev-edition-default",
"{b4c0d807-b6b8-4ee5-b666-9de1ec78b73a}",
"90456",
"gecko-crash-server-pipe.90456",
"org.mozilla.machname.1847863566",
"tab"
],
"cpu_usage": 0.0,
"memory": 44875776,
"children": []
},
{
"pid": 965,
"ppid": 90456,
"name": "plugin-container",
"cmd": [
"/Applications/Firefox Developer Edition.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container",
"-childID",
"162",
"-isForBrowser",
"-prefsLen",
"39653",
"-prefMapSize",
"260845",
"-jsInitLen",
"234780",
"-sbStartup",
"-sbAppPath",
"/Applications/Firefox Developer Edition.app",
"-sbLevel",
"3",
"-parentBuildID",
"20240628091536",
"-greomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/omni.ja",
"-appomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser/omni.ja",
"-appDir",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser",
"-profile",
"/Users/axetroy/Library/Application Support/Firefox/Profiles/9v87tgkr.dev-edition-default",
"{ff312d05-9914-490c-a11f-214d166968ca}",
"90456",
"gecko-crash-server-pipe.90456",
"org.mozilla.machname.593999603",
"tab"
],
"cpu_usage": 0.029250585,
"memory": 207863808,
"children": []
},
{
"pid": 25662,
"ppid": 90456,
"name": "plugin-container",
"cmd": [
"/Applications/Firefox Developer Edition.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container",
"-childID",
"387",
"-isForBrowser",
"-prefsLen",
"39709",
"-prefMapSize",
"260845",
"-jsInitLen",
"234780",
"-sbStartup",
"-sbAppPath",
"/Applications/Firefox Developer Edition.app",
"-sbLevel",
"3",
"-parentBuildID",
"20240628091536",
"-greomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/omni.ja",
"-appomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser/omni.ja",
"-appDir",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser",
"-profile",
"/Users/axetroy/Library/Application Support/Firefox/Profiles/9v87tgkr.dev-edition-default",
"{3edc273d-c890-49ba-a848-34b63a38a990}",
"90456",
"gecko-crash-server-pipe.90456",
"org.mozilla.machname.348803789",
"tab"
],
"cpu_usage": 0.0,
"memory": 44875776,
"children": []
},
{
"pid": 90466,
"ppid": 90456,
"name": "plugin-container",
"cmd": [
"/Applications/Firefox Developer Edition.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container",
"-parentBuildID",
"20240628091536",
"-prefsLen",
"36879",
"-prefMapSize",
"260845",
"-sbStartup",
"-sbAppPath",
"/Applications/Firefox Developer Edition.app",
"-appDir",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser",
"-profile",
"/Users/axetroy/Library/Application Support/Firefox/Profiles/9v87tgkr.dev-edition-default",
"{5d7ffcb8-a4b2-4e04-a484-db2a31cab739}",
"90456",
"gecko-crash-server-pipe.90456",
"org.mozilla.machname.2112256667",
"socket"
],
"cpu_usage": 0.0,
"memory": 14827520,
"children": []
},
{
"pid": 22804,
"ppid": 90456,
"name": "plugin-container",
"cmd": [
"/Applications/Firefox Developer Edition.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container",
"-childID",
"385",
"-isForBrowser",
"-prefsLen",
"39709",
"-prefMapSize",
"260845",
"-jsInitLen",
"234780",
"-sbStartup",
"-sbAppPath",
"/Applications/Firefox Developer Edition.app",
"-sbLevel",
"3",
"-parentBuildID",
"20240628091536",
"-greomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/omni.ja",
"-appomni",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser/omni.ja",
"-appDir",
"/Applications/Firefox Developer Edition.app/Contents/Resources/browser",
"-profile",
"/Users/axetroy/Library/Application Support/Firefox/Profiles/9v87tgkr.dev-edition-default",
"{0cd4c2c4-2a1b-43ae-8345-3c1e306714cd}",
"90456",
"gecko-crash-server-pipe.90456",
"org.mozilla.machname.162325247",
"tab"
],
"cpu_usage": 1.0462717,
"memory": 180043776,
"children": []
}
]
}$ ps-tree --help
Usage: ps-tree <PID> [Options]
Options:
<PID> Process ID to monitor.
--help,-h Print the help information
--version,-V Print the version information
--interval SECONDS Time interval between updates in seconds.
Description:
This tool monitors the specified process and refreshes the information
every SECONDS seconds, as specified by the --interval option.
Source Code:
https://github.com/axetroy/ps-tree.rsThe MIT License