src: add loop idle time in diagnostic report #35940

gireeshpunathil · 2020-11-03T07:31:14Z

Add libuv's cumulative idle time in the diagnostic report.
Modify the structure of libuv section to cater to this change

Refs: #34938

before

  "libuv": [
    {
      "type": "async",
      "is_active": true,
      "is_referenced": false,
      "address": "0x0000000105a0bd70"
    }
  ]

after

  "libuv": {
    "loop_idle_time": 22644.8,
    "handles": [
      {
      "type": "async",
      "is_active": true,
      "is_referenced": false,
      "address": "0x0000000105a0bd70"
      }
    ]
  }

Checklist

make -j4 test (UNIX), or vcbuild test (Windows) passes
tests and/or benchmarks are included
documentation is changed or added
commit message follows commit guidelines

richardlau · 2020-11-03T10:56:14Z

Add libuv's cumulative idle time in the diagnostic report.
Modify the structure of libuv section to cater to this change

Refs: #34938

before

  "libuv": [
    {
      "type": "async",
      "is_active": true,
      "is_referenced": false,
      "address": "0x0000000105a0bd70"
    }
  ]

after

  "libuv": {
    "loop_idle_time": 22644.8,
    "handles": [
      {
      "type": "async",
      "is_active": true,
      "is_referenced": false,
      "address": "0x0000000105a0bd70"
      }
    ]
  }

Is this structural change (as opposed to just a new field) the sort of thing that should bump reportVersion?
cc @boneskull

gireeshpunathil · 2020-11-03T11:05:56Z

@richardlau - it is a new field addition, but that led to a structural change too. Original structure libuv was an array as it contained homogeneous entries. But now with the idle time in it, it is no more uniform, so I converted it into an object. Happy to move it either side, upon review comments:

retain the libuv 's original structure and add the field elsewhere
modify the structure and bump the version

cjihrig · 2020-11-03T13:56:08Z

I think the report version should be bumped. Can you also update the example report in the documentation.

gireeshpunathil · 2020-11-03T16:57:18Z

all - I have bumped the report version to 3, and reflected the change in the doc too. PTAL!

addaleax · 2020-11-03T21:40:40Z

Why do we not add this to the loop entry in the handles list? That would a) be more consistent than this PR, because that’s where information about the loop currently goes and b) prevent a breaking change to the format that we can avoid that way.

gireeshpunathil · 2020-11-04T04:44:51Z

@addaleax - to confirm my understanding, are you proposing this style?

  "libuv": [
    {
      "type": "async",
      "is_active": true,
      "is_referenced": false,
      "address": "0x0000000105a0bd70"
    },
    {
      "loop_idle_time": 22644.8
    }
  ]

gireeshpunathil · 2020-11-04T04:47:35Z

or I guess here, as an additional key-value pair:

{
  "type": "loop",
  "is_active": true,
  "address": "0x000055fc7b2cb180",
  "loop_idle_time": 22644.8
}

?

addaleax · 2020-11-04T09:16:59Z

@gireeshpunathil Yes, the latter, for the loop entry in the handles list.

gireeshpunathil · 2020-11-04T10:03:13Z

@addaleax - done, ptal!

src/node_report.cc

richardlau

LGTM.

Maybe also add a validator for loop to the uv handles test to assert the new field is present and a number?

node/test/report/test-report-uv-handles.js

Lines 119 to 171 in 9dbde1d

    
           // Functions are named to aid debugging when they are not called. 
        
           const validators = { 
        
             fs_event: common.mustCall(function fs_event_validator(handle) { 
        
               if (!child_data.skip_fs_watch) { 
        
                 assert.strictEqual(handle.filename, expected_filename); 
        
                 assert(handle.is_referenced); 
        
               } 
        
             }), 
        
             fs_poll: common.mustCall(function fs_poll_validator(handle) { 
        
               assert.strictEqual(handle.filename, expected_filename); 
        
               assert(handle.is_referenced); 
        
             }), 
        
             pipe: common.mustCallAtLeast(function pipe_validator(handle) { 
        
               assert(handle.is_referenced); 
        
             }), 
        
             process: common.mustCall(function process_validator(handle) { 
        
               assert.strictEqual(handle.pid, child_data.pid); 
        
               assert(handle.is_referenced); 
        
             }), 
        
             tcp: common.mustCall(function tcp_validator(handle) { 
        
               // TCP handles. The report should contain three sockets: 
        
               // 1. The server's listening socket. 
        
               // 2. The inbound socket making the request. 
        
               // 3. The outbound socket sending the response. 
        
               const port = child_data.tcp_address.port; 
        
               if (handle.localEndpoint.port === port) { 
        
                 if (handle.remoteEndpoint === null) { 
        
                   found_tcp.push('listening'); 
        
                 } else { 
        
                   found_tcp.push('inbound'); 
        
                 } 
        
               } else if (handle.remoteEndpoint.port === port) { 
        
                 found_tcp.push('outbound'); 
        
               } 
        
               assert(handle.is_referenced); 
        
             }, 3), 
        
             timer: common.mustCallAtLeast(function timer_validator(handle) { 
        
               assert(!handle.is_referenced); 
        
               assert.strictEqual(handle.repeat, 0); 
        
             }), 
        
             udp: common.mustCall(function udp_validator(handle) { 
        
               if (handle.remoteEndpoint === null) { 
        
                 assert.strictEqual(handle.localEndpoint.port, 
        
                                    child_data.udp_address.port); 
        
                 found_udp.push('unconnected'); 
        
               } else { 
        
                 assert.strictEqual(handle.remoteEndpoint.port, 
        
                                    child_data.udp_address.port); 
        
                 found_udp.push('connected'); 
        
               } 
        
               assert(handle.is_referenced); 
        
             }, 2), 
        
           };

Trott

LGTM but I think doc/api/report.md still needs the relevant example updated to include this? (and the missing semicolon added to the test per linter)

nodejs-github-bot · 2020-11-10T13:15:17Z

CI: https://ci.nodejs.org/job/node-test-pull-request/34285/

trevnorris · 2020-11-11T00:32:43Z

I'm just curious. Why add it as loopIdleTimeSeconds instead of as it comes in high precision milliseconds?

addaleax · 2020-11-11T00:35:59Z

@trevnorris What would you suggest instead? Seconds were suggested by me because they match other existing fields in the diagnostic output, so we’re being a bit consistent here instead of using random units everywhere.

trevnorris · 2020-11-11T00:41:51Z

@addaleax That's fine. I just noticed the field firesInMsFromNow in the libuv array for type: 'timer' and thought of following the timing of the closest field. But I have no strong feelings either way.

nodejs-github-bot · 2020-11-11T22:55:47Z

CI: https://ci.nodejs.org/job/node-test-pull-request/34345/

gireeshpunathil · 2020-11-12T14:29:07Z

uv_metrics_idle_time is defined in uv.h and that is available through inclusion of env-inl.h. Adding node_perf.h is not required, plus it causes compilation failure in darwin, so I removed it.

@richardlau @cjihrig @addaleax @Trott - PTAL!

cjihrig

LGTM with one small question.

cjihrig · 2020-11-12T14:42:18Z

src/node_report.cc

+
+    // Report Event loop idle time
+    uint64_t idle_time = uv_metrics_idle_time(env->event_loop());
+    writer.json_keyvalue("loopIdleTimeSeconds", 1.0 * idle_time / 1e9);


Is idle_time in nanoseconds? I thought @trevnorris said it was milliseconds in #35940 (comment).

The libuv code uses uv_hrtime() without any additional scaling, so, yes, nanoseconds.

node/src/node_perf.cc

Lines 446 to 447 in 589b2a1

uint64_t idle_time = uv_metrics_idle_time(env->event_loop());

args.GetReturnValue().Set(1.0 * idle_time / 1e6);

this may make it very clear - the nanoseconds that comes is converted to millis if accessed through API.

That makes sense. I was just confused by #35940 (comment). Thanks Anna and Gireesh.

nodejs-github-bot · 2020-11-12T14:44:54Z

CI: https://ci.nodejs.org/job/node-test-pull-request/34370/

gireeshpunathil · 2020-11-13T03:03:53Z

https://ci.nodejs.org/job/node-test-binary-arm-12+/RUN_SUBSET=3,label=pi3-docker/8251/console

the failure in arm is #36090 , which is fixed now.

nodejs-github-bot · 2020-11-13T03:15:44Z

CI: https://ci.nodejs.org/job/node-test-pull-request/34379/

Add libuv's cumulative idle time in the diagnostic report. Add the data under the libuv's loop section Refs: nodejs#34938 PR-URL: nodejs#35940 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Richard Lau <rlau@redhat.com>

gireeshpunathil · 2020-11-13T06:28:49Z

landed in 74bd866

Add libuv's cumulative idle time in the diagnostic report. Add the data under the libuv's loop section Refs: #34938 PR-URL: #35940 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Richard Lau <rlau@redhat.com>

Notable changes: dns: * (SEMVER-MINOR) add a cancel() method to the promise Resolver (Szymon Marczak) #33099 events: * (SEMVER-MINOR) add max listener warning for EventTarget (James M Snell) #36001 http: * (SEMVER-MINOR) add support for abortsignal to http.request (Benjamin Gruenbaum) #36048 http2: * (SEMVER-MINOR) allow setting the local window size of a session (Yongsheng Zhang) #35978 lib: * (SEMVER-MINOR) add throws option to fs.f/l/statSync (Andrew Casey) #33716 path: * (SEMVER-MINOR) add `path/posix` and `path/win32` alias modules (ExE Boss) #34962 readline: * (SEMVER-MINOR) add getPrompt to get the current prompt (Mattias Runge-Broberg) #33675 src: * (SEMVER-MINOR) add loop idle time in diagnostic report (Gireesh Punathil) #35940 util: * (SEMVER-MINOR) add `util/types` alias module (ExE Boss) #34055 PR-URL: TODO

Notable changes: dns: * (SEMVER-MINOR) add a cancel() method to the promise Resolver (Szymon Marczak) #33099 events: * (SEMVER-MINOR) add max listener warning for EventTarget (James M Snell) #36001 http: * (SEMVER-MINOR) add support for abortsignal to http.request (Benjamin Gruenbaum) #36048 http2: * (SEMVER-MINOR) allow setting the local window size of a session (Yongsheng Zhang) #35978 lib: * (SEMVER-MINOR) add throws option to fs.f/l/statSync (Andrew Casey) #33716 path: * (SEMVER-MINOR) add `path/posix` and `path/win32` alias modules (ExE Boss) #34962 readline: * (SEMVER-MINOR) add getPrompt to get the current prompt (Mattias Runge-Broberg) #33675 src: * (SEMVER-MINOR) add loop idle time in diagnostic report (Gireesh Punathil) #35940 util: * (SEMVER-MINOR) add `util/types` alias module (ExE Boss) #34055 PR-URL: #36232

Add libuv's cumulative idle time in the diagnostic report. Add the data under the libuv's loop section Refs: #34938 PR-URL: #35940 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Richard Lau <rlau@redhat.com>

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src: add loop idle time in diagnostic report #35940

src: add loop idle time in diagnostic report #35940

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	// Functions are named to aid debugging when they are not called.
	const validators = {
	fs_event: common.mustCall(function fs_event_validator(handle) {
	if (!child_data.skip_fs_watch) {
	assert.strictEqual(handle.filename, expected_filename);
	assert(handle.is_referenced);
	}
	}),
	fs_poll: common.mustCall(function fs_poll_validator(handle) {
	assert.strictEqual(handle.filename, expected_filename);
	assert(handle.is_referenced);
	}),
	pipe: common.mustCallAtLeast(function pipe_validator(handle) {
	assert(handle.is_referenced);
	}),
	process: common.mustCall(function process_validator(handle) {
	assert.strictEqual(handle.pid, child_data.pid);
	assert(handle.is_referenced);
	}),
	tcp: common.mustCall(function tcp_validator(handle) {
	// TCP handles. The report should contain three sockets:
	// 1. The server's listening socket.
	// 2. The inbound socket making the request.
	// 3. The outbound socket sending the response.
	const port = child_data.tcp_address.port;
	if (handle.localEndpoint.port === port) {
	if (handle.remoteEndpoint === null) {
	found_tcp.push('listening');
	} else {
	found_tcp.push('inbound');
	}
	} else if (handle.remoteEndpoint.port === port) {
	found_tcp.push('outbound');
	}
	assert(handle.is_referenced);
	}, 3),
	timer: common.mustCallAtLeast(function timer_validator(handle) {
	assert(!handle.is_referenced);
	assert.strictEqual(handle.repeat, 0);
	}),
	udp: common.mustCall(function udp_validator(handle) {
	if (handle.remoteEndpoint === null) {
	assert.strictEqual(handle.localEndpoint.port,
	child_data.udp_address.port);
	found_udp.push('unconnected');
	} else {
	assert.strictEqual(handle.remoteEndpoint.port,
	child_data.udp_address.port);
	found_udp.push('connected');
	}
	assert(handle.is_referenced);
	}, 2),
	};

	uint64_t idle_time = uv_metrics_idle_time(env->event_loop());
	args.GetReturnValue().Set(1.0 * idle_time / 1e6);

src: add loop idle time in diagnostic report #35940

src: add loop idle time in diagnostic report #35940

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