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Re: SSD's and many edits of a single file

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On 04/11/18 00:27, Gene Heskett wrote:
> On Tuesday 10 April 2018 22:24:39 David Christensen wrote:
>> Can you reproduce the bugs on a machine with straight-up Debian (e.g.
>> no linuxcnc)?
>>
> That to me would be rather pointless. The only places where I be doing
> wholesale edits would be for linuxcnc use.

If geany and gedit fail on a machine with Debian plus LinuxCNC, but work 
correctly on a machine with Debian alone, that would indicate the bug is 
related to LinuxCNC.


>> As a safety net, I would suggest a versioning file system (e.g.
>> similar to the versioning feature of VMS).  STFW is pretty thin, but
>> copyfs might be worth a try:
> 
> This "fuse" would be on top of ext4? Or on an SSD that was a copy of this
> one but using fuse as opposed to ext4?

Here is information about FUSE:

https://en.wikipedia.org/wiki/Filesystem_in_Userspace


See link below for information about copyfs.


> What seems to be lost on you folks not running realtime patched kernels,
> is that when linuxcnc is running, it has total control over the
> hardware, and that linux becomes a client of the realtime system,
> getting what cpu time is left after linuxcnc has finished what it has to
> do to meet the timing constraints needed to run the machine and meet the
> sub-micron positioning accuracy required.
> 
> Not your fault of course because to you its effectively real time if you
> do not see a lag between touching a key and the response on screen. But
> a 20ns response time is about 3 orders of magnitude faster than that
> which is realtime to you.

I used to work as a embedded systems software engineer back in the 
dot-com days.  My niche was controlling electro-mechanical systems using 
8051, 68xx, and 68xxx micro-controllers.  I have written C and assembly 
language drivers and programs to meet soft and hard real-time 
requirements, including stepper motor sequencing.  I had heard of hard 
real-time kernels that used Linux as their idle loop.  I have since used 
Linux real-time patches for my audio and music hobbies.


>> https://packages.debian.org/search?keywords=copyfs&searchon=names&suit
>> e=all&section=all
> 
> This link shows 2 versions, but only the older, 1.4 might be usable since
> the newest system I'm running is jessie on an r-pi-3b. Stretch so far is
> not stable on arm64, aka a rock64 yet. Even running an amanda client on
> the arm64 can take it down. Downgrade its install to a jessie derived
> version and its dead stable. And amanda is dead stable on 6 of the 7
> systems with a net cable plugged into it here.
> 
> But this link does not contain a sales pitch describing what it can do
> and why it should be used, 

Here is information about copyfs:

https://boklm.eu/copyfs/


> I think that by changing how I work, so that an edit is done with a fresh
> invocation of the editor each time, that I will not see this problem
> again, so we should really put this thread to bed.

I used VMS systems back in the 1980's, and VMS's versioning file system 
was a killer feature that I would love to have on my Linux machines today:

https://mike632t.wordpress.com/2016/03/15/vms-file-operations-for-beginners/


Unfortunately, the semantics of copyfs appear to differ.


> "Magic Twanger" and Froggie indeed, that kiddie tv show is now 68 years
> old. I guess that does date me. 99% of the readers of this message have
> no clue where that phrase came from.

STFW I see Andy's Gang (but it's before my time):

https://www.youtube.com/watch?v=G6a3fck0NBI


> Thanks David.

Thanks for the interesting problem to think about.  :-)


David

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Thread

SSD's and many edits of a single file Gene Heskett <gheskett@shentel.net> - 2018-04-09 03:20 +0200
  Re: SSD's and many edits of a single file Abdullah Ramazanoglu <ar018@yahoo.com> - 2018-04-09 03:30 +0200
  Re: SSD's and many edits of a single file Stefan Monnier <monnier@iro.umontreal.ca> - 2018-04-09 04:20 +0200
    Re: SSD's and many edits of a single file Gene Heskett <gheskett@shentel.net> - 2018-04-09 04:50 +0200
      Re: SSD's and many edits of a single file Stefan Monnier <monnier@iro.umontreal.ca> - 2018-04-09 05:20 +0200
        Re: SSD's and many edits of a single file Gene Heskett <gheskett@shentel.net> - 2018-04-09 12:00 +0200
          Re: SSD's and many edits of a single file <tomas@tuxteam.de> - 2018-04-09 13:30 +0200
          Re: SSD's and many edits of a single file Stefan Monnier <monnier@iro.umontreal.ca> - 2018-04-09 15:10 +0200
            Re: SSD's and many edits of a single file Gene Heskett <gheskett@shentel.net> - 2018-04-09 15:40 +0200
              Re: SSD's and many edits of a single file Greg Wooledge <wooledg@eeg.ccf.org> - 2018-04-09 15:50 +0200
                Re: SSD's and many edits of a single file Stefan Monnier <monnier@iro.umontreal.ca> - 2018-04-09 16:20 +0200
          Re: SSD's and many edits of a single file rhkramer@gmail.com - 2018-04-09 15:50 +0200
            Re: SSD's and many edits of a single file Greg Wooledge <wooledg@eeg.ccf.org> - 2018-04-09 16:00 +0200
              Re: SSD's and many edits of a single file Gene Heskett <gheskett@shentel.net> - 2018-04-09 16:40 +0200
                Re: SSD's and many edits of a single file Greg Wooledge <wooledg@eeg.ccf.org> - 2018-04-09 16:40 +0200
                Re: SSD's and many edits of a single file David Christensen <dpchrist@holgerdanske.com> - 2018-04-10 03:30 +0200
                Re: SSD's and many edits of a single file Gene Heskett <gheskett@shentel.net> - 2018-04-10 06:00 +0200
                Re: SSD's and many edits of a single file David Christensen <dpchrist@holgerdanske.com> - 2018-04-11 04:30 +0200
                Re: SSD's and many edits of a single file Gene Heskett <gheskett@shentel.net> - 2018-04-11 09:30 +0200
                Re: SSD's and many edits of a single file David Christensen <dpchrist@holgerdanske.com> - 2018-04-12 05:50 +0200
                Re: SSD's and many edits of a single file rhkramer@gmail.com - 2018-04-12 13:50 +0200
                Re: SSD's and many edits of a single file Gene Heskett <gheskett@shentel.net> - 2018-04-12 14:50 +0200
                Re: SSD's and many edits of a single file rhkramer@gmail.com - 2018-04-12 16:20 +0200
                Re: SSD's and many edits of a single file songbird <songbird@anthive.com> - 2018-04-12 17:00 +0200
                Re: SSD's and many edits of a single file Gene Heskett <gheskett@shentel.net> - 2018-04-13 03:30 +0200
                Re: SSD's and many edits of a single file <tomas@tuxteam.de> - 2018-04-10 10:00 +0200
                Re: SSD's and many edits of a single file Gene Heskett <gheskett@shentel.net> - 2018-04-10 13:00 +0200
                Re: SSD's and many edits of a single file <tomas@tuxteam.de> - 2018-04-10 13:10 +0200
                Re: SSD's and many edits of a single file Gene Heskett <gheskett@shentel.net> - 2018-04-10 14:20 +0200
                Re: SSD's and many edits of a single file <tomas@tuxteam.de> - 2018-04-10 15:20 +0200
                Re: SSD's and many edits of a single file "Thomas Schmitt" <scdbackup@gmx.net> - 2018-04-10 15:20 +0200
                Re: SSD's and many edits of a single file Stefan Monnier <monnier@iro.umontreal.ca> - 2018-04-10 16:00 +0200
                Re: SSD's and many edits of a single file "Thomas Schmitt" <scdbackup@gmx.net> - 2018-04-10 16:30 +0200
            Re: SSD's and many edits of a single file Gene Heskett <gheskett@shentel.net> - 2018-04-09 16:20 +0200
              Re: SSD's and many edits of a single file <tomas@tuxteam.de> - 2018-04-09 18:30 +0200
            Re: SSD's and many edits of a single file Abdullah Ramazanoglu <ar018@yahoo.com> - 2018-04-09 20:10 +0200
          Re: SSD's and many edits of a single file Celejar <celejar@gmail.com> - 2018-04-10 16:50 +0200
  Re: SSD's and many edits of a single file songbird <songbird@anthive.com> - 2018-04-09 14:10 +0200
    Re: SSD's and many edits of a single file Gene Heskett <gheskett@shentel.net> - 2018-04-09 16:20 +0200
      Re: SSD's and many edits of a single file songbird <songbird@anthive.com> - 2018-04-09 20:20 +0200

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