processCallbacks.push(async child => {

				// load and start profiler
				const profiler = await import('v8-inspect-profiler');
				const main = await profiler.startProfiling({ port: portMain });
				const renderer = await profiler.startProfiling({ port: portRenderer, tries: 200 });
				const extHost = await profiler.startProfiling({ port: portExthost, tries: 300 });

				// wait for the renderer to delete the
				// marker file
				whenDeleted(filenamePrefix);

				let profileMain = await main.stop();
				let profileRenderer = await renderer.stop();
				let profileExtHost = await extHost.stop();
				let suffix = '';

				if (!process.env['VSCODE_DEV']) {
					// when running from a not-development-build we remove
					// absolute filenames because we don't want to reveal anything
					// about users. We also append the `.txt` suffix to make it
					// easier to attach these files to GH issues
					profileMain = profiler.rewriteAbsolutePaths(profileMain, 'piiRemoved');
					profileRenderer = profiler.rewriteAbsolutePaths(profileRenderer, 'piiRemoved');
					profileExtHost = profiler.rewriteAbsolutePaths(profileExtHost, 'piiRemoved');
					suffix = '.txt';
				}

				// finally stop profiling and save profiles to disk
				await profiler.writeProfile(profileMain, `${filenamePrefix}-main.cpuprofile${suffix}`);
				await profiler.writeProfile(profileRenderer, `${filenamePrefix}-renderer.cpuprofile${suffix}`);
				await profiler.writeProfile(profileExtHost, `${filenamePrefix}-exthost.cpuprofile${suffix}`);
			});

			return new Promise<void>(c => {

				// Complete when process exits
				child.once('exit', () => c(undefined));

				// Complete when wait marker file is deleted
				whenDeleted(waitMarkerFilePath!).then(c, c);
			}).then(() => {

			return new TPromise<void>(c => {

				// Complete when process exits
				child.once('exit', () => c(null));

				// Complete when wait marker file is deleted
				whenDeleted(waitMarkerFilePath).done(c, c);
			});

			processCallbacks.push(async _child => {

				class Profiler {
					static async start(name: string, filenamePrefix: string, opts: { port: number, tries?: number, target?: (targets: Target[]) => Target }) {
						const profiler = await import('v8-inspect-profiler');

						let session: ProfilingSession;
						try {
							session = await profiler.startProfiling(opts);
						} catch (err) {
							console.error(`FAILED to start profiling for '${name}' on port '${opts.port}'`);
						}

						return {
							async stop() {
								if (!session) {
									return;
								}
								let suffix = '';
								let profile = await session.stop();
								if (!process.env['VSCODE_DEV']) {
									// when running from a not-development-build we remove
									// absolute filenames because we don't want to reveal anything
									// about users. We also append the `.txt` suffix to make it
									// easier to attach these files to GH issues
									profile = profiler.rewriteAbsolutePaths(profile, 'piiRemoved');
									suffix = '.txt';
								}

								await profiler.writeProfile(profile, `${filenamePrefix}.${name}.cpuprofile${suffix}`);
							}
						};
					}
				}

				try {
					// load and start profiler
					const mainProfileRequest = Profiler.start('main', filenamePrefix, { port: portMain });
					const extHostProfileRequest = Profiler.start('extHost', filenamePrefix, { port: portExthost, tries: 300 });
					const rendererProfileRequest = Profiler.start('renderer', filenamePrefix, {
						port: portRenderer,
						tries: 200,
						target: function (targets) {
							return targets.filter(target => {
								if (!target.webSocketDebuggerUrl) {
									return false;
								}
								if (target.type === 'page') {
									return target.url.indexOf('workbench/workbench.html') > 0;
								} else {
									return true;
								}
							})[0];
						}
					});

					const main = await mainProfileRequest;
					const extHost = await extHostProfileRequest;
					const renderer = await rendererProfileRequest;

					// wait for the renderer to delete the
					// marker file
					await whenDeleted(filenamePrefix);

					// stop profiling
					await main.stop();
					await renderer.stop();
					await extHost.stop();

					// re-create the marker file to signal that profiling is done
					fs.writeFileSync(filenamePrefix, '');

				} catch (e) {
					console.error('Failed to profile startup. Make sure to quit Code first.');
				}
			});