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Re: question about memtest86+

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On 23/08/2018 09:58, Long Wind wrote:
> i install memtest86+ of stretch to test memory
> i don't see any error msg, but after a few minutes, it shutdown my PC
> does that mean my memory is bad?
> i read manual of memtest86+, can't find explaination

Uncommanded shutdowns may be caused by overheating. What is your CPU 
temperature under load? Your BIOS may shut your computer down if a 
temperature limit is exceeded. Manufacturer? Laptop? Model? CPU? BIOS 
version?

I use and recommend memtester, which can be run after a normal boot 
("userspace"). I found that multiple concurrent instances of memtester 
detected memory problems not found by memtest86+. Run memtester as root 
so it can memlock.  Because memtester runs after a normal boot, you can 
use a desktop temperature monitoring tool. I use the Xfce sensors applet 
polling at one second intervals, and this script:

#!/bin/bash
tmax=0
while true; do
     t=$((`cat /sys/class/hwmon/hwmon2/temp1_input`/1000))
     tmax=$((t>tmax?t:tmax))
     echo "`date '+%T'`: $t / $tmax"
     sleep 1
done

I also use thermald to limit CPU temperature (but my problem was not 
temperature). I use a custom service file to reduce the polling interval 
to one second.

Another useful test tool is mprime <https://www.mersenne.org/download/> 
(AKA Prime95 on Windows). Be sure to disable AVX with "CpuSupportsAVX=0" 
in local.txt because synthetic AVX tests can be used to generate 
excessive and unrealistic amounts of heat.

Kind regards,

-- 
Ben Caradoc-Davies <ben@transient.nz>
Director
Transient Software Limited <https://transient.nz/>
New Zealand

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Thread

question about memtest86+ Long Wind <longwind2@yahoo.com> - 2018-08-23 00:10 +0200
  Re: question about memtest86+ David Christensen <dpchrist@holgerdanske.com> - 2018-08-23 03:00 +0200
  Re: question about memtest86+ Ben Caradoc-Davies <ben@transient.nz> - 2018-08-23 03:30 +0200
  Re: question about memtest86+ Felix Miata <mrmazda@earthlink.net> - 2018-08-23 03:50 +0200
  Re: question about memtest86+ Jimmy Johnson <field.engineer@gmail.com> - 2018-08-23 04:20 +0200
  Re: question about memtest86+ Felix Miata <mrmazda@earthlink.net> - 2018-08-23 10:40 +0200
  Re: question about memtest86+ Long Wind <longwind2@yahoo.com> - 2018-08-23 10:40 +0200
    Re: question about memtest86+ Ben Caradoc-Davies <ben@transient.nz> - 2018-08-24 00:00 +0200
      Re: question about memtest86+ Long Wind <longwind2@yahoo.com> - 2018-08-24 09:20 +0200
        Re: question about memtest86+ Jimmy Johnson <field.engineer@gmail.com> - 2018-08-24 11:20 +0200
          Re: question about memtest86+ Long Wind <longwind2@yahoo.com> - 2018-08-24 13:00 +0200
        Re: question about memtest86+ Ben Caradoc-Davies <ben@transient.nz> - 2018-08-25 02:40 +0200
        Re: question about memtest86+ David Christensen <dpchrist@holgerdanske.com> - 2018-08-25 05:50 +0200
          Re: question about memtest86+ Long Wind <longwind2@yahoo.com> - 2018-08-25 13:30 +0200
            (solved) Re: question about memtest86+ Long Wind <longwind2@yahoo.com> - 2018-08-26 12:00 +0200
    Re: question about memtest86+ David Christensen <dpchrist@holgerdanske.com> - 2018-08-24 03:20 +0200
  Re: question about memtest86+ Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2018-08-23 17:20 +0200

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