[b2g] Best way to profile web app startup performance
I want to profile the startup of an app. The goal is to see where things like layout and paint might block startup to see if we need some new APIs to turn off these things while the app JS is generating the starting view, related to this dev-platform thread[1]. How do people do that sort of profiling today? It is my understanding raptor is not the tool for that, and the profile.sh script should be used. I did a build and can run profile.sh via the instructions on MDN[2]. I can get captures from running processes, but since I want to profile the startup of a webapp[3], using `start -p [name]` is not the way to go, since the pid cannot be not known when the app is closed. Using `./profile.sh start` with no other arguments restarts the device, but goes to a black screen and is not operable. The MDN page also indicates this mode of profile.sh is deprecated. The last lines in the logcat when this happens: I/ServiceManager( 190): service 'android.security.keystore' died I/ServiceManager( 190): service 'SurfaceFlinger' died I/ServiceManager( 190): service 'permission' died I/ServiceManager( 190): service 'display.qservice' died I/Gecko ( 2712): [Child 2712] WARNING: pipe error (3): Connection reset by peer: file /home/jr/git/B2G/gecko/ipc/chromium/src/chrome/common/ipc_channel_posix.cc, line 459 I/Gecko ( 2712): I/Gecko ( 2712): ###!!! [Child][MessageChannel::SendAndWait] Error: Channel error: cannot send/recv I tried the WebIDE's profiling tool and clicking the reload button in there, and I can gather some information that way, but I feel it is not completely accurate for startup since the reload button also seems to trigger the install app flow and the app installed popup. It also appears like the app window is not completely destroyed and started fresh each time. James [1] https://groups.google.com/forum/#!topic/mozilla.dev.platform/F3Mp6dZonMA [2] https://developer.mozilla.org/en-US/docs/Mozilla/Performance/Profiling_with_the_Built-in_Profiler#Other_Ways_to_Profile_B2G [3] https://github.com/jrburke/fxos-startup-test ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
Re: [b2g] Best way to profile web app startup performance
On Tue, Aug 11, 2015 at 9:34 AM, Fabrice Desré fabr...@mozilla.com wrote: You can profile by using the pid of the preallocated app, since this is the one that will be used once you actually launch your app. You can get it by running |adb shell b2g-info|. Thanks for the guidance! To be extra literal since it took me an extra step to process: Look for the process called (Preallocated a, and use the PID of it in the `./profile.sh start -p [number]` command. It also shows up for me in `./profile.sh ps` command. I updated the MDN page[1] with this info. James [1] https://developer.mozilla.org/en-US/docs/Mozilla/Performance/Profiling_with_the_Built-in_Profiler#Start_the_Profiler ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
Re: [b2g] Is navigator.syncManager used at all?
On Wed, Jun 10, 2015 at 6:53 PM, Yoshi Huang allstars@mozilla.com wrote: I also found a test app written by James Burke in https://github.com/jrburke/requestsyncmanager but it looks to me it's more like a test app. Just confirming that is a test app, not shipped with gaia. However, I would like it to still work in the future, so if there are API changes that I would need to do, please let me know. If it is just a matter of deleting the app and reinstalling that works for me. James ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
Re: [b2g] Granting Permissions to the Web
On Wed, Feb 18, 2015 at 3:51 AM, Anne van Kesteren ann...@annevk.nl wrote: Trying to figure out how to get sockets and systemXHR into the browser has been going on for a very long time now, I think we should start embracing that it's unlikely to happen and look elsewhere. The look elsewhere will be native platforms. While these discussions may have been going on for a while, hopefully the new bit of information is that these sorts of capabilities really are useful to have as shown in FirefoxOS and native platform offerings. Plus, I really do not think we should be encouraging people to run proxy servers to open them up to government and hacking hazards. Hopefully what can be revisited is the frame of mind around these APIs from a web perspective. Mobile use is really large. Native mobile apps do not have restrictions from these APIs. If web sites are concerned about getting cross domain hits, they can get them now from native apps. We definitely need to be careful, making sure we do not pass things like cookies for these types of requests, and to also allow for services to explicitly indicate they do not want to allow these types of connections, but what has been suggested instead of using these types of APIs does not seem better. James ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
Re: [b2g] Granting Permissions to the Web
On Tue, Feb 17, 2015 at 11:12 AM, David Ascher david.asc...@gmail.com wrote: I don't see any data saying that devs aren't making webapps because hosting is prohibitive. Is anyone? (I think it's too _hard_ for people who don't have the skills, but that's a whole different ball of wax). Echoing the sentiment about hard: it adds a lot more complication. A service I now need to monitor as a developer to keep running, when it is not needed if I do a native app. It can also require a different set of developer skills. There are security and privacy concerns too, another link in the chain of connections that can be compromised. I work on the email app for Gaia. It would give me nightmares to try to secure a general email server proxy. I would not want to make guarantees to people on its reliability or trustworthiness, and having to be on the hook to possibly accommodate government snooping requests. I greatly prefer a model where the browser asks the user OK to connect to this server for cases where this cross domain access is needed, so that the user knows what is happening, it is a special privilege, and the user should have control over it. Maybe there is a different way to go about this, but CORS or running a proxy is not a sufficient story. Without this sort of capability, any email web app is at a distinct disadvantage to a native app environment (also see the need for TCP sockets in the email case). James ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
Re: [b2g] Can we deprecate packaged apps?
On Fri, Jan 30, 2015 at 6:48 AM, Benjamin Francis bfran...@mozilla.com wrote: There have been several proposals of how to provide privileged hosted apps, including work around hosted packages [3] and discussions around a security model. Link [3] (bug 1036275) seems mostly about how to reference resources inside a zip file. It also seems to imply that the packaged app could be hosted anywhere, not via a marketplace? I would be interested to know how validation of the privileged app is done (this thing I agreed to access these APIs is still the same vetted thing). If there is some sort of signature checking going on, it would be great to see that extended to certified apps, where we allow certain signed apps access to the certified APIs. This sort of model would allow gaia apps to go hosted. They also likely need a way to make sure they can provide certain app bundles for certain gecko versions. Without those things, it is hard to see the gaia apps going to this model. We will continue to get new APIs that we will be expected to use behind a certified flag. The latest is the navigator.sync API. That API is a great one to have for battery concerns, but needs service workers to be fully realized, is still new, so it is a certified API. For users getting 2.2 though, ideally our apps would use the API in the effort to extend battery life. I would like to see gaia apps go to a hosted model (even just marketplace hosting), since it gives us a dogfood way to test how we expect other apps to be made. ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
Re: [b2g] Visibility plan for document.registerElement (custom elements)
On Wed, Jan 28, 2015 at 11:24 AM, Soledad Penadés spena...@mozilla.com wrote: Can you use a polyfill in the meantime? There is a polyfill for enabling only the custom element registration part http://webcomponents.org/polyfills/custom-elements/ I would prefer to not add that layer if possible. Our custom element use so far is light (just custom-named divs with extra properties attached) and we have had a way to modularize our UI, so not a deal-breaker if we cannot use custom elements. I also want to target serializing the HTML for some cards used as in entry points served by service workers, for fast startup. This will mean if using custom elements, constructing them in very idiomatic ways, so being able to reuse today's off the shelf components would not be one of the main drivers for the custom elements. --- Separately, I was informed off-list that perhaps dev-platform is a better place to post this question, so I did so there: https://groups.google.com/forum/#!topic/mozilla.dev.platform/zdYYVi-ayIU It might be best to continue further discussion on that list. Apologies for the initial fuzzy list targeting. Off-list I was also pointed to https://wiki.whatwg.org/wiki/CustomElements that might have some useful background information. James ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
[b2g] For v2.2: distributable certified apps
For 2.2, I would like to see an exploration into allowing Gaia apps, and apps that can use certified APIs, to be distributed via marketplace channels, and updated outside full OS updates. That could take a few forms, including just pushing more/all certified APIs to privileged status. However, I expect that may not be feasible, so right now I am assuming there will be a continued need for certified apps. I wrote up something about this capability here: https://github.com/jrburke/certified-marketplace Feel free to file issues in that repo if you have questions about it. Happy to move the info elsewhere, just wanted to get something up. More importantly, it would be good to figure out the relative priority of this sort of feature for 2.2, which is the primary point of this thread. This sort of capability could be in opposition to some of the UX or product features. For example, I am thinking of the themeable feature, to allow apps to be themed, and to have that theming coordinated across apps, and for apps to have a specific dependency on a theme.gaiamobile.org app. However, this type of app distribution capability is very fitting for our mission, as it allows more people to make certified apps (after being vetted in some way) and to allow those apps to get updates outside of full OS updates. --- If this is just too big of a project for 2.2, then I would like to get an awareness or some sort of agreement for allowing individual apps to follow this path, and to realize it may mean those apps are not able to meet some other goals if they pursue this route. Specifically, I work on the email app, and I believe we could still get to a updatable via marketplace, and I would like to try for that for 2.2: Email app goes privileged, and the app just lives with what is available to privileged apps. I think this is possible and still have a great, usuable email app. However, it means email not picking up any gaia-wide efforts that my require certified stuff. For 2.2, that could mean things like theming and if custom elements are not fully enabled for non-certified use, any common building blocks. Even if custom elements are available for 2.2, I am sure there will be other things in other releases, just pointing out the need to get wider agreement this pathway is OK for some apps that may be seen as part of gaia. It also means possible modifications to the l10n.js capability to load localizations from app storage, and to do downloads of localization bundles from somewhere. While I am willing to do the modifications, it would still require some impact on reviewers' time, and likely some server work. To clarify: I want to preserve the existing localizer workflow, just want to modify how an app pulls in the final localizations, see above link for some more background. --- In summary: I would like this “certified” capability considered for 2.2. I am not expecting an immediate resolution, as all the 2.2 work needs to be balanced in total, and is still in planning. This is just to get it on the radar and to call out some of the tensions. Also, dev could start some plumbing now while planning is still in progress, and where it makes sense for the email app, I will start exploring in these areas. James (sending to dev-b2g, as it seems the most appropriate for what this capability spans, and want to avoid cross posting to multiple lists) ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
Re: [b2g] Settings API queries fail after inner-window-destroyed
On Thu, Sep 25, 2014 at 6:08 PM, Kyle Machulis kmachu...@mozilla.com wrote:
Return fake DOMRequest-like objects that instantly fail?
I favor this, although not sure what is meant by fake vs. just a real
DOMRequest that doesn’t do anything special/will not call onsuccess,
just onerror.
Expressing the failure via an onerror call would match what I would
expect from promise-like code: any operation that is async should get
an object that captures the result of the operation, and handle the
success or errors as functions. For DOMRequest, it is attaching .on*
properties, for promises it is passing functions to .then().
This also means the error handling is just in one place, the .onerror.
Instead of needing to manage a try{} around the acquisition of the
DOMRequest and then in the .onerror.
James
___
dev-b2g mailing list
dev-b2g@lists.mozilla.org
https://lists.mozilla.org/listinfo/dev-b2g
Re: [b2g] Application scopes
On Tue, Aug 5, 2014 at 11:27 PM, Jonas Sicking jo...@sicking.cc wrote: On Tue, Aug 5, 2014 at 7:51 PM, James Burke jrbu...@gmail.com wrote: The use case is a site that has app-like functionality for offline, but has product pages that are not tied to that app, and the app does not know how to navigate to them on its own. And both the app and the site are from the same domain, because that is the well known identifier for users. Sorry, I don't understand this. This was the example I was thinking of, perhaps I have a misunderstanding somewhere: My users knows about my password manager, at pwm.com. I have the following structure: * pwm.com/ - index page that gives summary, and an install button. * pwm.com/app.html the main app page mentioned in the manifest, the launch_path. It uses appcache or a way to get local assets under /app as the installed app. Then a bunch of product pages that are not really needed for use of the app once it is installed: * pwm.com/features.html - in depth feature survey. * pwm.com/help.html - could be a help forum/support that changes often. * pwm.com/comparison.html - compares against similar password managers. I would prefer to not have those last three open inside my app, as the app was configured around local data storage and may have routes/pages that do not correspond with the public site URLs. So a way to tell the system “do not open up my app for those URLs, just what is installed locally”. Perhaps similar to when I have a tab opened for pwm.com/app.html in a desktop browser, then in another tab I am on a different web site and I click on a link on that site that goes to pwm.com/help.html. James ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
Re: [b2g] Sensor events when the screen is off via wakelock. Good idea or?
On Tue, Aug 5, 2014 at 12:59 AM, Jan Jongboom janjongb...@gmail.com wrote: On Sunday, August 3, 2014 3:48:52 AM UTC+2, Jonas Sicking wrote: * Add the ability to specify a vibration pattern to the Notification API. I.e. when creating a notification, enable passing not just the text content of the notification, but also the vibration pattern that is played with the notification. I think this should be part of an overhaul of notifications API, with more finer control over how notifications are shown (e.g. grouping when multiple notifications come in like in Android, or widgets inline, etc.). Don't know if this would be the place for it. Possibly related: for email, we wanted finer control over notification behaviors/modes, filed this previously: https://bugzilla.mozilla.org/show_bug.cgi?id=912645 James ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
Re: [b2g] Application scopes
On Mon, Aug 4, 2014 at 7:20 PM, Jonas Sicking jo...@sicking.cc wrote:
High-level overview of proposed solution:
Add two fields to the application manifest:
{
name: AwesomeGame,
...
scope: [http://awesomegame.com/*;],
open-in-app: [http://awesomegamehelper.com/*;]
}
1) What is the scope setting if I do not want outside apps to deep link,
because I want a separate cookie jar/db space as an app vs plain browser
web navigation, `scope: []`?
The use case is a site that has app-like functionality for offline, but has
product pages that are not tied to that app, and the app does not know how
to navigate to them on its own. And both the app and the site are from the
same domain, because that is the well known identifier for users.
2) What is the open-in-app setting if I want to open all links triggered
from my app to open inside my app, `open-in-app: [“*”]`?
The use case is something like Yelp, that wants to perhaps track which
restaurant pages are visited, and keep quick links back to the restaurant
review page visible while that navigation occurs.
___
dev-b2g mailing list
dev-b2g@lists.mozilla.org
https://lists.mozilla.org/listinfo/dev-b2g
Re: [b2g] Gaia is currently closed
Judging from the commit log in Gaia, Gaia appears to be open now. Someone who has topic mod abilities for #gaia may want to change the IRC room topic. On Tue, Jun 24, 2014 at 1:49 PM, Ryan VanderMeulen rvandermeu...@mozilla.com wrote: Due to high test job backlog caused by problems with today's reconfig, all trunk trees on TBPL are currently closed. Gaia has been pre-emptively closed to avoid any bustage pileups for when b2g-inbound reopens. Apologies for any inconvenience this causes, we will reopen as soon as we are able. -Ryan ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
Re: [b2g] Session Restoring of WebApps
On Tue, Apr 8, 2014 at 9:24 AM, Alive al...@mozilla.com wrote: In case not every one knows, we are trying to keep a crashed app in task manager and restore it with the latest url. It’s implemented already, see https://bugzilla.mozilla.org/show_bug.cgi?id=935750 Someone call it ‘zombie app’, but I call this ‘suspending app’ to reflect it’s suspending. I am not familiar with how gecko implements session restore, but as James Burke said, it’d be easy to keep the state with url in system app and restore the url in the app resuming process. I was curious to see how the URL restoration worked, what its limits were, so I created a test app that uses pushState with URL fragment ID changes. It seems like perhaps that bug is just for a crash scenario and not an OOM? I could not trigger a case where it would resume from last URL with the fragment ID, but I was mostly testing an OOM case. But bigger picture for me, along the thoughts in this thread, is to have a way for the history state to be maintained, such that this sample app could relaunch at its last state/URL and clicking the back button inside the app would continue to work for the history state it had previously. I can see where there are complications for the system to know when to restore this and when to start fresh based on user action. Hopefully the test app could help if someone wanted to play with changes to get it to work. If there are bugs already filed for this, or other discussions related to it, feel free to point me in the right direction. App zip: http://jrburke.com/work/gaia/fxos-url-state.zip Can be installed using about:app-manager: https://github.com/jrburke/gaia-dev-zip#for-the-ux-person Source code: https://github.com/jrburke/fxos-url-state James ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
Re: [b2g] a proposal on one tool to rule them all
On Mon, Apr 21, 2014 at 10:20 AM, Benoit Girard bgir...@mozilla.com wrote: Otherwise we just have to upload the symbols to the symbol server and add code to query the symbols when profiling. We also need to implement an versioning system for XUL. That would have no impact to what we ship but we'd need to modify the build script and have the symbol servers ready to handle this data. Perhaps an intermediate step to that full goal: I would be happy with some pvt nightly build that just delivered whatever was needed by profile.sh in the build zip, like what would be generated via a local build. So not necessarily part of the files pushed to the phone, just in the build zip. Presumably, however that works now will work at least on the hamachi device I use today, no memory/size issues, just as if I did the build locally. I am perfectly happy to follow manual instructions to copy the files from that zip to a particular location relative to profile.sh so that it is happy and can run, without me doing the full build locally. Making profile.sh smart and be able to pull from a server is great, just looking for a way to get to a profile endpoint if it looks like the full goal would take more time to accomplish. James ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
Re: [b2g] a proposal on one tool to rule them all
On Mon, Apr 7, 2014 at 10:34 AM, Dave Huseby dhus...@mozilla.com wrote: Thoughts? I would really like to get some feedback on this. If we think this is a good idea, it will dominate the perf dev-tools effort for the foreseeable future as it would be a tool useful for both Mozilla engineers (e.g. fxos-perf team, gaia team, etc) and 3rd party app developers. One thing that also might help make the whole perf capture easier to do today, without needing to expand the tooling: It would be nice to have a way to get symbols for use in the profile.sh workflow without needing to do a local build myself. Perhaps provide them as an option for engineering pvt builds. For some of us gaia developers, needing to maintain a local build of b2g on a laptop (plus the extra hitches if using latest OS X) means it is enough of a barrier that I have not done it recently, but at the same time have wanted to do some perf captures. James ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
Re: [b2g] If you use setTimeout in tests, you are gonna have a bad time
On Wed, Dec 18, 2013 at 8:10 AM, Julien Wajsberg jwajsb...@mozilla.com wrote: The main issue is that using setTimeout or other async tests on Travis and TBPL will always trigger intermittent from time to time because it will hit the max timeout for a test. So sometimes we can't avoid it, and in that case we should augment the expected timeout, but we should try hard to not use async tests if it's possible. Switching code that usually expects async operation to go sync can open up bugs of its own, and they are very subtle, hard to catch and debug[1]. Unfortunately I know that from previous experience. For me, it also seems like it is trying to work around a problem in the test infrastructure that ultimately defeats the purpose of the tests: to verify that the code written will perform as expected. If the code written expects async operation, the tests should be async. Although I also appreciate that having a robust test infrastructure is hard, requires dedicated, ongoing resources. For speed concerns, perhaps the microtasks idea may help with that. I am still hazy on them, but it seems like an async callback is called after the current execution via a local queue, not placed at the end of the main event loop. They seem like they will be used behind the scenes, but I have been thinking of using an immediately resolved promise to take advantage of them if/when microtasks and promises are in the platform (and assuming the promise implementation uses them). In any case, I do not want to derail the main message of this thread: do not use setTimeout to guess when an async action is done, listen for an event or publicly observable state to confirm the completion of the async operation instead. [1] http://blog.izs.me/post/59142742143/designing-apis-for-asynchrony ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
Re: [b2g] starttls email
On Tue, Sep 3, 2013 at 9:48 PM, an novac.a...@gmail.com wrote: Anyone knows if the email app supports starttls? I use a mail server which uses starttls for all of its services and I get an error when the app tries to connect to it. Not in a release yet, but the work is in progress. You can follow this bug to know when it finishes landing: https://bugzilla.mozilla.org/show_bug.cgi?id=847032 James ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
[b2g] unagi transition plan
There have been rumblings of the unagi devices no longer being supported in the near future for 1.2 work. There are a few people within and without Mozilla that only have an unagi devices. What devices are suggested for people that currently have unagi devices? This is my current understanding, but it has been pieced together, hoping to get confirmation of this guidance: 1) A developer doing daily gaia development: try to get a hamachi. You need a phone that is close to what is shipping for making sure changes do not affect performance. Caveat seems to be that they may be hard to get. 2) A developer that wants to start making apps for firefoxos: the nexus 4 may be an option. It could also be used for main gaia work, but note: while the build settings for nexus 4 try to throttle it to look more like the kinds of devices that may ship in the near term, it is not an exact match, so use with caution. I have ordered a Nexus 4 as backstop to make sure I can keep working in case my unagi stops working, but I believe I should also acquire a more realistic shipping device for any performance work. To me that implies hamachi, but it will be good to know if there are other options. James ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
Re: [b2g] Save/restore feature
On Sat, Jul 6, 2013 at 3:58 PM, Fabrice Desre fabr...@mozilla.com wrote: On the technical side: This may be going too far, but what about the possibility of implementing WebUSB[1], and using that in some fashion to allow a different firefox phone to back up another phone with a direct USB connection? I could see that as being useful for people that do not have a dedicated PC. [1] https://bugzilla.mozilla.org/show_bug.cgi?id=674718 James ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
Re: [b2g] mozilla-b2g github avatar
You may want to get a pencil version of the image: http://www.mozilla.org/en-US/styleguide/identity/firefoxos/community/ I believe they wanted to reserve the the one with the colors for partner/release branding. James On Tue, Jul 2, 2013 at 2:52 PM, Ben Kelly bke...@mozilla.com wrote: Hi all, Now that we have this cool profile pic: https://assets.mozillalabs.com/Graphics/Facebook/FirefoxOS/fb_social_avatar_403x403.png I was wondering if we could use it for the mozilla-b2g organization on Github. Thoughts? Any admins out there willing to update the group's gravatar setting? Anyway, this is obviously not a priority. Just thought I would ask. :-) Thanks. Ben ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
Re: [b2g] Startup work delaying event loop?
On Thu, Apr 18, 2013 at 2:48 AM, Justin Lebar justin.le...@gmail.com wrote: It's possible that the main process is taking CPU time from the child process, and that's why it appears that the child process's event loop is busy at that point in time. But if you want to know the answer for sure, you'd have to profile. We have tools that will let you get a fairly complete picture of what's going on. I tried a b2g build with the 1ms profile patch applied and did a profile.sh capture. It did not seem to account for all the time, but I am very new to deciphering the output. I wrote up what I could make out of it and opened a ticket that points to the perf capture, as it seems like that may be a more appropriate channel for this kind of thing: https://bugzilla.mozilla.org/show_bug.cgi?id=863870 James ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
Re: [b2g] App load signal
On Thu, Apr 18, 2013 at 2:51 AM, Justin Lebar justin.le...@gmail.com wrote: File a bug and we can see if this is reasonable! Thanks for suggestion. For future reference, filed here: https://bugzilla.mozilla.org/show_bug.cgi?id=863499 James ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
[b2g] Startup work delaying event loop?
I am investigating email app cold startup time. If the code puts something in the event loop via a postMessage or a very short setTimeout during the startup of the app, it could be delayed as much as ~130-150ms for the first item, and often a follow-on item after that one can take ~20-50ms. This can add up to around ~200ms delay for app logic to complete. This is using BRANCH=v1-train VARIANT=eng b2g builds for the unagi device. I am using a build from code pulled around 4pm April 16 Pacific time. I did a test using this app: https://github.com/jrburke/gaia/tree/eventloop/apps/eventloop Specifically, this test.js: https://github.com/jrburke/gaia/blob/eventloop/apps/eventloop/test.js Some sample output: FAST TICK DONE IN: 134.704587996 DEFAULT SET TIMEOUT DONE IN: 52.97851700465 0 SET TIMEOUT DONE IN: 18.4631329929 4ms SET TIMEOUT DONE IN: 6.0424869 After the page has loaded, the times to complete the callbacks are in line with expectations, it is just during the startup phase where the time delay is really large. I did a run by disabling the screenshotting in gaia, and that seems to help the second, ~50ms case, removing that delay, but the first one still remains: FAST TICK DONE IN: 144.409178993 DEFAULT SET TIMEOUT DONE IN: 1.342774006452 0 SET TIMEOUT DONE IN: 0.640868998387 4ms SET TIMEOUT DONE IN: 4.63867200042 I can appreciate that the answer may be the platform is still starting up the mozbrowser, this is expected. However, I was hoping that I would not have to special case a sync path for some generic code used for dynamic async loading of segments of the app, just for the first card setup. Even with a special sync path, it seems like I just shift around the ~150ms wait to another point in the app, and still seems to get in there before the user can interact with the first card. It also seems odd because the page is pretty simple (no CSS, l10n), and the script is set as defer, so I would have expected that the script was one of the last things run as part of the app load. James ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
[b2g] App load signal
This started on dev-gaia: http://groups.google.com/group/mozilla.dev.gaia/browse_thread/thread/a0faa6512f71bc94 Summary: As apps use more async/defer-loaded JS and more async APIs for final construction, the platform cannot accurately detect when the app has finished loading and is in a usable state. Ideally the app could signal to the platform when it considers itself loaded. This would give the following immediate benefits: * better transitions from app screenshots to running app (avoiding its a web page white flash during initial load) * better indication when a screenshot could be taken, without it happening during the time the app needs to finish the load. * better tracking of how long apps actually take to load to be usable. Would it be possible for the platform to support a way for the app to signal that is has finished loading? Perhaps a 'mozappload' (or some moz-prefixed) event that can be created via new CustomEvent by the app JS code and dispatched on window, and the platform would allow mozbrowser elements to surface this event, so that the gaia system could listen for it, as it can for the other mozbrowser events: https://developer.mozilla.org/en-US/docs/WebAPI/Browser#Events James ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
Re: [b2g] Scroll bar fade out interfering with CSS animation?
On Fri, Jan 18, 2013 at 1:23 PM, James Burke jrbu...@gmail.com wrote: Any hints or guidance on how to get a smooth animation in this case? I filed the following to track this possible issue, so any feedback should be placed in that ticket: https://bugzilla.mozilla.org/show_bug.cgi?id=834353 James ___ dev-b2g mailing list dev-b2g@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-b2g
