[Glass] out of memory error

[Otto Behrens]

Thanks, Dale

Otto Behrens

+27 82 809 2375
[image: FINWorks]
[image: FINWorks] <http://za.linkedin.com/in/waltherbehrens>
www.finworks.biz

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On Wed, Feb 2, 2022 at 9:10 PM Dale Henrichs <
dale.henrichs at gemtalksystems.com> wrote:

> In order to arrange for AlmostOutOfMemory to be handled in Seaside, you
> should add the exception to GRGemStonePlatform>>gemstoneExceptionSelector
> which is sent by WAGemStoneWalkbackErrorHandler in the WAExceptionHandler
> hierarchy.  You would then edit WAErrorHandler>>handleGemStoneException:
> to add the logic for handling the AlmostOutOfMemory and in your handler you
> want to reenable AlmostOutOfMemory ... when you start your Seaside gem you
> will also have to enable AlmostOutOfMemory ...
>
> The way that AlmostOutOfMemory events occur, it is possible to run out of
> memory in a section of code or process that is not protected by the
> AlmostOutOfMemory handler and if that is the case, you would need to resort
> to a static handler to be able to record a stack ...
>
> Dale
>
> On Wed, Feb 2, 2022 at 10:05 AM Bill Erickson via Glass <
> glass at lists.gemtalksystems.com> wrote:
>
>> Otto,
>>
>> > The class name seems to be AlmostOutOfMemory in 3.4.1 and was perhaps
>> renamed to AlmostOutOfMemoryError
>> >  (I suppose in 3.6 also sunglasses from error). Is this correct?
>>
>> Yes.
>>
>> > I am able to call AlmostOutOfMemory addDefaultHandler: in 3.4.1.
>> > Should I rather use AlmostOutOfMemory enable vs. System
>> enableAlmostOutOfMemoryError?
>>
>> Either way is fine.  More details are available on page 276 section
>> "Signal on low memory condition" in the 3.4 version of the Programming
>> Guide.
>>
>> > Secondly, my code snippet for #handleException: is in the Seaside
>> WAExceptionHandler hierarchy.
>> > There is a structure to filter exceptions by "kind". How will I get
>> #addDefaultHandler: to work with this?
>>
>> Default exception handlers are asynchronous and work outside of the
>> normal exception hierarchy.  There's no real way to coordinate the two.
>>
>> ------------------------------------------------------------------------
>> Bill Erickson
>> GemTalk Systems Engineering
>> 15220 NW Greenbrier Parkway #240, Beaverton OR 97006
>> ------------------------------------------------------------------------
>>
>>
>> On Wed, Feb 2, 2022 at 6:39 AM Otto Behrens <otto at finworks.biz> wrote:
>>
>>> Thanks for the reply, Bill.
>>>
>>> Firstly, I'm using 3.4.1. The class name seems to be AlmostOutOfMemory
>>> in 3.4.1 and was perhaps renamed to AlmostOutOfMemoryError (I suppose in
>>> 3.6 also sunglasses from error). Is this correct?
>>>
>>> I am able to call AlmostOutOfMemory addDefaultHandler: in 3.4.1. Should
>>> I rather use AlmostOutOfMemory enable vs. System
>>> enableAlmostOutOfMemoryError?
>>>
>>> Secondly, my code snippet for #handleException: is in the
>>> Seaside WAExceptionHandler hierarchy. There is a structure to filter
>>> exceptions by "kind". How will I get #addDefaultHandler: to work with this?
>>>
>>> Regards
>>>
>>> Otto Behrens
>>>
>>> +27 82 809 2375
>>> [image: FINWorks]
>>> [image: FINWorks] <http://za.linkedin.com/in/waltherbehrens>
>>> www.finworks.biz
>>>
>>> Disclaimer & Confidentiality Note: This email is intended solely for the
>>> use of the individual or entity named above as it may contain information
>>> that is confidential and privileged. If you are not the intended recipient,
>>> be advised that any dissemination, distribution or copying of this email is
>>> strictly prohibited. FINWorks cannot be held liable by any person other
>>> than the addressee in respect of any opinions, conclusions, advice or other
>>> information contained in this email.
>>>
>>>
>>> On Wed, Feb 2, 2022 at 4:20 PM Bill Erickson <
>>> bill.erickson at gemtalksystems.com> wrote:
>>>
>>>> Try setting up a default handler as explained on page 264-265 of the
>>>> 3.6 Programming Guide (section titled "Default Handlers"), using something
>>>> like:
>>>>
>>>> AlmostOutOfMemoryError addDefaultHandler: [:ex |
>>>>      < your code here >
>>>>      AlmostOutOfMemoryError enable.
>>>>      ex resume].
>>>> AlmostOutOfMemoryError enable.
>>>>
>>>> ------------------------------------------------------------------------
>>>> Bill Erickson
>>>> GemTalk Systems Engineering
>>>> 15220 NW Greenbrier Parkway #240, Beaverton OR 97006
>>>> ------------------------------------------------------------------------
>>>>
>>>>
>>>> On Wed, Feb 2, 2022 at 5:17 AM Otto Behrens via Glass <
>>>> glass at lists.gemtalksystems.com> wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> We are getting OutOfMemory errors in a seaside request handler because
>>>>> we are doing something ridiculous. We will fix that problem, but I'd like
>>>>> to handle the out of memory situation better because currently our sessions
>>>>> do not report that it did go out of memory, because it is unable to, for
>>>>> obvious reasons.
>>>>>
>>>>> I was thinking of enabling AlmostOutOfMemory and then report the error
>>>>> like we do with other exceptions: write a stack trace to the logs, send an
>>>>> email message and then redirect to an error page.
>>>>>
>>>>> I called
>>>>> System enableAlmostOutOfMemoryError
>>>>> in my Seaside application initialization, which did not work.
>>>>> I then tried it in my session startup script (similar to the
>>>>> seaside/bin/startSeaside_FastCGI script) and it also did not work.
>>>>>
>>>>> I just get the same old OutOfMemory fatal error.
>>>>>
>>>>> I tried adding this to my error handler:
>>>>> handleException: anException
>>>>> ^ (AlmostOutOfMemory handles: anException)
>>>>> ifTrue: [ System enableAlmostOutOfMemoryError.
>>>>> self handleError: anException ]
>>>>> ifFalse: [ (Notification handles: anException)
>>>>> ifTrue: [ super handleException: anException ]
>>>>> ifFalse: [ self handleError: anException ] ]
>>>>>
>>>>> Any ideas?
>>>>>
>>>>> Kind regards
>>>>>
>>>>> Otto Behrens
>>>>>
>>>>> +27 82 809 2375
>>>>> [image: FINWorks]
>>>>> [image: FINWorks] <http://za.linkedin.com/in/waltherbehrens>
>>>>> www.finworks.biz
>>>>>
>>>>> Disclaimer & Confidentiality Note: This email is intended solely for
>>>>> the use of the individual or entity named above as it may contain
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>>>>> liable by any person other than the addressee in respect of any opinions,
>>>>> conclusions, advice or other information contained in this email.
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