[squeak-dev] Crash

Jörg Belger unique75 at web.de
Thu Feb 10 20:07:34 UTC 2022


There is no crash.dmp file

> Am 10.02.2022 um 20:58 schrieb Eliot Miranda <eliot.miranda at gmail.com>:
> 
> HI Jörg,
> 
> On Wed, Feb 9, 2022 at 11:08 PM Jörg Belger <unique75 at web.de <mailto:unique75 at web.de>> wrote:
> Hi Dave,
> 
> I mean with „crash“ the Squeak process is exited unexpectedly, it is just fully gone away. Maybe it happens for me earlier because if have a 32 GB machine and I do not have so much swapping. It is not a hanging/locking/unresponsivness, it is a real crash :-)
> 
> Is there a crash.dmp file?  If so, can you post it? It should be in the same directory as either the image or the vm.
> 
> Here are my machine details:
> 
> Gerätename      timemachine
> Prozessor       AMD Ryzen 9 3900X 12-Core Processor               3.80 GHz
> Installierter RAM       32,0 GB
> Geräte-ID       F6FA897B-DDB1-44D6-9BF3-8BD1110AA754
> Produkt-ID      00326-10048-08575-AA867
> Systemtyp       64-Bit-Betriebssystem, x64-basierter Prozessor
> Stift- und Toucheingabe Für diese Anzeige ist keine Stift- oder Toucheingabe verfügbar.
> 
> Edition Windows 10 Home
> Version 20H2
> Installiert am  ‎23.‎03.‎2021
> Betriebssystembuild     19042.1526
> Leistung        Windows Feature Experience Pack 120.2212.4170.0
> 
> 
> > Am 10.02.2022 um 04:27 schrieb David T. Lewis <lewis at mail.msen.com <mailto:lewis at mail.msen.com>>:
> > 
> > On Thu, Feb 03, 2022 at 10:30:49PM +0100, J??rg Belger wrote:
> >> This leads to an image/VM crash too
> >> 
> >>      | oc |
> >>      oc := OrderedCollection new.
> >>      400000000 timesRepeat: [oc add: Object new]
> >> 
> >> This here is working for me:
> >> 
> >>      | oc |
> >>      oc := OrderedCollection new: 400000000.
> >>      400000000 timesRepeat: [oc add: Object new]
> >> 
> >> This here is working too for me:
> >> 
> >>      | oc |
> >>      oc := OrderedCollection new.
> >>      400000000 timesRepeat: [oc add: 1]
> >> 
> >> It seems there is possibly a memory problem in the VM.
> >> 
> >> 
> > 
> > I have tried to reproduce this on my PC with 8GB memory. I was not able
> > to crash the VM but it certainly locked my system up in swapping as the
> > test continued to use memory. Eventually I ran out of time and patience
> > and killed the VM process.
> > 
> > If there is an actual VM crash involved then maybe there is a bug. But
> > if you are seeing your Squeak image is just stalling out, then nothing
> > is wrong except for a matter of basic arithmetic.
> > 
> > You are trying to allocate 400,000,000 individual objects, each of which
> > requires 16 bytes of memory in the object memory, and you are storing
> > each of those objects using an 8 byte object pointer to the object in
> > the ordered collection. So just for the raw storage you are going to
> > need for those "Object new" things, you need 400,000,000 * (16 + 8)
> > = 9,600,000,000 bytes. On top of that you are putting the objects into
> > an OrderedCollection that does not know that you are going to ask it
> > to hold 400,000,000 object pointers, so it has to keep extending itself
> > as the test proceeds.
> > 
> > When I tried to run this on my PC with a mere eight GB of real memory,
> > the operating system had to start swapping out real memory make room
> > for all of that activity. And every time the OrderedCollection needs
> > to extend its space, it is accessing real memory that probably got
> > swapped out to disk to make room in the 8GB of real memory space, so
> > basically it puts the system into a death spiral that locks up the
> > Squeak image (and pretty much everything else on my computer).
> > 
> > So I am able to reproduce the locked up image (as I would expect on my
> > PC with only 8GB memory) but I have not been able to reproduce a crash.
> > 
> > Just to clarify, are you describing a "crash" in which the actual
> > Squeak VM process exited unexpectedly, or was it a "crash" in the
> > sense of the the image locking up and becoming unresponsive? If the
> > latter, then most likely nothing is wrong.
> > 
> > Dave
> > 
> > 
> 
> 
> 
> 
> -- 
> _,,,^..^,,,_
> best, Eliot

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