Re: frustrating memory anomaly

On Apr 9, 2005, at 2:48 pm, Anthony Brian Arthur wrote:

> On Apr 9, 2005, at 1:55 PM, Sacha Mallais wrote:
>
>> On Apr 9, 2005, at 7:24 am, Anthony Brian Arthur wrote:
>>
>>> Hi,
>>>
>>> Configuration:
>>>
>>> OS - OS X server 10.3.8
>>> CPU - dual 1.8
>>> RAM - 3 gig
>>> WO - 5.2 or greater
>>>
>>> I have an app that fails in deployment (becoming unavailable in the 
>>> middle of a transaction) that does not fail while testing the same 
>>> scenario in development.  This happens while downloading a rather 
>>> large data set to a file.  The deployed memory settings are -Xms256m 
>>> -Xmx1800m.  Now, even though this is a large data set, it is 
>>> virtually impossible for it to be greater than 1.8 gig.  This is a 
>>> raw row fetch from 1 table, no joins.  Meanwhile the whole database 
>>> in an oracle dump is only 2.16 gig.
>>>
>> Hi Brian,
>>
>> Does the app crash in the middle of the transaction or does the 
>> connection fail?
> No, the connection is good.  I am certain of that because several 
> pages are traversed before reaching the download.  Also, downloads 
> work properly with smaller data sets.  What happens is, shortly after 
> the offending download starts, say 15-20 seconds, the browser displays 
> a page, all blank except 'Application not available' (or some such) at 
> the top.
>
Yeah, this really sounds like a connection timeout.


>> If you're running out of memory, I would expect to see a OOM 
>> exception in the logs.  Are you seeing that?
> No, none of the logs are showing an OOM exception.  That includes the 
> Access log, Error log, and the one specific to the app.
>
>> I ask because it sounds like you might be timing out in deployment 
>> (because the machine is not local to you, the download takes longer).
>>
>> Try tweaking the connection timeout param in JavaMon.
> This makes sense.  Which field is it -- Lifebeat interval, or some 
> custom flag in Additional Args?
>
It's in the Load Balancing and Adaptor Settings section of the 
application configuration page.


sacha


-- 
Sacha Michel Mallais - 800 lb. gorilla
Global Village Consulting Inc.:   http://www.global-village.net/
ObAd: read "Practical WebObjects" <fnord>
http://www.global-village.net/products/practical_webobjects