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Old 2015-03-13, 05:41   #1
Dale Mahalko
Mar 2015

210 Posts
Talking HTML5 prime number searching?

I am a school tech support employee, and occasionally I get people bringing in broken Chromebooks where they say "it's slow" "it's crashing" etc, but then when I use it I can't find anything wrong.

I need some way to torture the CPU and memory in Chromebooks to force it to crash, and Prime95 has been very helpful in the past when dealing with unstable Windows computers.

Is it possible to implement a prime number worker in HTML5 so I can make these poor weak little Chromebook CPUs cry out for mercy?
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Old 2015-03-13, 10:26   #2
paulunderwood's Avatar
Sep 2002
Database er0rr

3,673 Posts
Default has my HTML/JavaScript program, but maybe better would be a tight floating point loop

Last fiddled with by paulunderwood on 2015-03-13 at 10:30
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Old 2015-03-15, 00:10   #3
Jan 2013

22·17 Posts

Couldn't you chroot some Linux and run mprime?
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Old 2015-03-15, 01:41   #4
Dale Mahalko
Mar 2015

2 Posts

The problem is that I am trying to diagnose what's wrong with a Chromebook "as-is" without extensively modifying the system. It may end up running an entirely different OS version when the flash is erased and switched to the developer mode OS.

Imagine having to wipe out Windows 7 on a device and having to format the drive and load say Debian to do stress testing. The test environment is now completely different from where we started and may not even be a valid comparison vs running with Windows 7.

Google is annoying in this regard because they provide absolutely nothing for hardware diagnostics and monitoring when a Chromebook is running in the default dumbed-down OS mode.
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Old 2015-03-15, 06:18   #5
Jayder's Avatar
Dec 2012

1000101102 Posts

I have never used a chromebook so I'm not quite sure what will do the trick for you. Do you know about crosh and its memtest? Is it very effective? If not, would loading (and tiling) 20 tabs of high resolution 3D models test it in the way you want it to?

As for CPU, what came to my mind was this folding@home browser app. Does it even work on your chromebooks?

I apologise if none of this is of any use to you.

Last fiddled with by Jayder on 2015-03-15 at 06:19
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Old 2015-03-15, 14:29   #6
EdH's Avatar
"Ed Hall"
Dec 2009
Adirondack Mtns

2·3·619 Posts

If you're interested in stress testing the hardware, can you simply create a Live USB of linux with mprime and run that? That would not touch the local OS.
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Old 2015-03-16, 17:08   #7
Just call me Henry
henryzz's Avatar
Sep 2007
Cambridge (GMT/BST)

2×5×587 Posts

Originally Posted by EdH View Post
If you're interested in stress testing the hardware, can you simply create a Live USB of linux with mprime and run that? That would not touch the local OS.
Also possible with windows:
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Old 2015-03-21, 19:55   #8
Feb 2009

22×7 Posts

You can't boot Chromebook from a USB drive without switching it into dev mode first. Switching is accompanied with powerwash. Though all the user profile data is stored at Google and restored back after sign-in to the account.
So, testing Chromebook includes:
1) switch to dev mode with auto powerwash
2) enabling booting from USB
3) loading live OS and testing
4) switching back from dev mode and auto powerwash (boot from USB will be switched off after this)
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