Hangouts Launch

Moving away from browser-based scenarios, we move onto real application use-cases. We start off with Google Hangouts. The first scenario is simply launching the application from the home-screen. The application was not cached in memory, so this is a cold launch.
First we open the app itself, and then we open up a chat conversation activity.

The duration of the test this time is only 3.6 seconds. During the initial application launch, we don't see much activity on the little cores. Cores 1-3 are mostly power-gated and we see that there's little to no threads placed onto the cluster during that period. Once the app opened, we see the threads migrate back onto the little cluster. Here we see full use of all 4 CPU cores as each core has threads placed on it doing activity.

This is the perfect burst-scenario for the big cores. The application launch kicks in the cores into high gear as they reach the full 2.1GHz of the SoC. We see that all 4 cores are doing work and have thread placed on them. Because of the fine granularity of the load, we see the CPUs rarely enter the power-gating state in this burst period as the CPU Idle governor prefers the shallower WFI clock-gating state. As a reminder, on the Exynos 7420 this state is setup for target residency times of 500µS.

In general, the workload is optimized towards 4-core CPUs. Because 4x4 big.LITTLE SoCs in a sense can be seen as 4-core designs, we don't see an issue here. On the other hand, symmetric 8-core designs here would see very little benefit from the additional cores.

Browser: Chrome - BBC Frontpage App: Hangouts Writing A Message


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  • lilmoe - Tuesday, September 1, 2015 - link

    "we're seeing what or how windows & the x86 platform has stagnated"

    Your argument is highly inaccurate and extremely dated. This isn't Windows XP era anymore... Windows 10 and 10 Mobile might as well be better than Android in what you're giving kudos to Google for (which they've somewhat managed after YEARS of promises). There's still a huge chunk of overhead in Android's rendering pipeline that needs serious attention. Android has made huge improvements, yes, but there still lots of work that needs to be done.

    @Impulses has a good point too; It's extremely difficult to get a fair apples-to-apples comparison when it comes to optimal handling of workloads for varying thermal limits. CPUs at ~2W TDP behave VERY differently from those at 15W, and both behave yet differently from those running at 37W+. This becomes evident when middle ground ~5W mobile CPUs are in the picture, like Intel's Core M, where devices running those are showing no better battery life than their 15W counterparts running the same OS. (Windows 10 is changing that, however, and is showing extreme battery savings in these lower TDPs, more so than the improvements in higher TDP parts, which tells a lot about W10).

    If that isn't clear enough already, read the article again. The author CLEARLY mentions in the first page not to make the mistake of applying the aforementioned metrics to other platforms and operating systems, and to strictly stick with Android and big.LITTLE.
  • Alexvrb - Tuesday, September 1, 2015 - link

    Thank you lilmoe and name99! I read his comment and I was like really? These results don't support his claims and were never intended to compare platforms - as specifically stated by the author. Reply
  • R0H1T - Thursday, September 3, 2015 - link

    XP to win10 took what a decade & a half? Vista was the last major change, after XP, DX10 & UAC, with win7 then win8 & now win10 bringing only incremental updates. Yeah I call that slow & we've had quad cores since what nearly a decade now, even then a vast majority of systems (desktops+notebooks) are dual core or 2 cores+HT surely that must make you cringe! Then we have programs that don't make use of multiple cores efficiently &/or the latest instruction sets like AVX. There's just a single web browser, that I know of, which uses the latter on PC! Call it whatever you may or twist it however you like to but this is one of the major reasons that PC sales are declining not just "everyone owns one & so they don't need it" excuse that's thrown around far too often. So far as "extrapolating this article to my observations" argument is concerned, there's no need to do that since there's historical precedence & copious amount of evidence to support pretty much every word of what I've said. Reply
  • Azethoth - Thursday, September 3, 2015 - link

    Ugh dude, you have no idea what you are talking about. 4.4 architectures on a phone are a desperate attempt to reduce power usage. I am a programmer and compile times matter to me and threading helps. Even so going from 8 threads on my desktop CPU to 12 threads on the E CPU a year later only reduces a total recompile of 26 minutes by 2-3 minutes. But that E cannot clock as high, so in the regular incremental compile case it is slower. Do you get this? You are factually wrong for an actual core dependent use case.

    Now I can stick my head in the sand like you and pretend that more cores are automatically better but it just isn't for my workload. You may as well bitch that I should be running on multi thousand dollar server CPUs with 16 cores. Again no. They have their place in a server, but no place in my desktop.
  • Samus - Tuesday, September 1, 2015 - link

    If "Google and Android" have 'nailed' MT then why do $600+ Android phones feel more sluggish, have a choppier UI, and launch programs slower than a 3 year old iPhone 5 or Lumia 800?

    Perhaps because the kernel and underlying architecture are so bloated because they need to support so many SOC's. They've resorted to heavy compression just to keep distribution sizes down, which also hits performance.

    Android only has one place, on cheap phones. You're an idiot if you buy a $600+ Android phone when you get the same crappy experience on a $50 Kyocera.

    I've tried so hard to like Android over the years, but every device I've had completely disappointed me compared to older Blackberry and modern iPhone devices where you don't need to find hacked distributions when manufactures drop the ball supporting the phone, or just make a crappy ROM in general. Even Nexus devices aren't immune to this and historically they haven't been very good phones, although admittedly, the only high-end Android phone worth buying is a Nexus, but now they cost so much it isn't justifiable.

    Basically I recommend two phones to people. If they want a cheap phone, get a OnePlus One or some other sub-$300 Android device. If you're budget is higher, get an iPhone, or if you are adventurous, a WinMo device. At least the iPhone will receive support for 4-5 years and holds its value during that time.
  • Buk Lau - Tuesday, September 1, 2015 - link

    I'm calling BS on most of your claims. Your experience with a Moto E (not saying it's a bad phone) will be vastly different from that of a Note 5, and those differences can start as obvious as how often you need to refresh your Chrome pages as you run out of RAM.
    What "600+" Android phone are you talking about that feels “more sluggish and slower” than a 3 year old iPhone? If you want people to take your claim seriously then at least provide some examples rather than this generic BS that anyone can easily come up with.
    The way Android is designed makes it kind of difficult to bring updates as surprising as you may found. Every time the OS updates, there are changes to the HAL (hardware abstraction layer) and those changes can be minor or significant. It is then up to the SoC provider to provide the proper drivers needed after the HAL change, and they certainly won’t provide it for free. At the same time, OEM also have to decide how much the new update will impede performance. For example my first gen Moto X got an update to 5.1.1 a few months ago and despite the new features, there are still performance hits in places. Even older devices probably will do better on Jelly Bean and KitKat anyways since Google Play services can be updated independent of OS version.
    Here’s some useful info on why Android is as fragmented as it is
    The biggest reason Apple updated all those 4S isn’t because how they loved their users, but rather to purposely slow down their devices to force them to upgrade. You can just ask the 4S users around you to see what iOS 8 really meant for them.
    I do agree however that people should try more $300-400 devices that are near flagship level with compromises that are more tolerable, and this $600+ smartphone price should really tone itself down a bit.
  • Kutark - Tuesday, September 1, 2015 - link

    Yeah i have to call bullshit on his claims too. I mean i know its anecdotal, but my buddies and i have had literally dozens of android phones over the years, as well as various iphones. And none of us have seen any kind of performance difference between the two. Im thinking he just had a shit experience with one android phone and like most people just wrote it off at that point.

    I have had a bad experience with an HTC Rezound, but every phone ive had before or after that has been fantastic. I absolutely LOVE my LG G3, its extremely responsive and fast, and i've never had issues with slowdowns on it. That being said i dont do any "gaming" (and i put gaming in quotes for a reason) on the phone, so i can't speak to that. But as far as browser, youtube, other apps, etc. It couldn't be more perfect.
  • Samus - Wednesday, September 2, 2015 - link

    I'm at IT director and I have a "shit experience" with android phones people bring to me every week.

    Defending android is like defending your Kia Rio. It's a low cost tool to fit a low cost niche. The experience is the same no matter who is driving.
  • Kutark - Wednesday, September 2, 2015 - link

    If you say so. As an IT director you should know that 99% of the time there is a problem, its user related and not hardware related. One thing i will give apple is that they lock their products down so hard that its much harder for the user to F it up. Whereas on more open platforms like android or windows, the user has much more control and thus much more ability to F things up royally.

    Whether thats a plus or a minus really just depends on what you're looking for. For people who want or need control over their hardware, its a plus, for people who just want something "to work" so to speak, its a minus.
  • mkozakewich - Wednesday, September 2, 2015 - link

    Your claim that Apple is trying to slow down devices throws off your entire argument, really. Reply

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