Some problems with stability – JS Application Server
Yes – I think he means the load sharing. Also see here: http://www.omnis.net/documentation/webdev/index.jsp?detail=07Deployment.html#server-load-sharing
> Am 09.02.2018 um 14:01 schrieb Mayada Al-Kishtini
> Hi Jan,
> Excuse my ignorance; when you say >> ” 8 omnis servers behind an LSP that handles the web calls.”, I assume this is per site/database.
> What is LSP? Is it an Omnis server load balancer or something else? I’m new to this area.
> Do you know if there is any documentation that I can read about how to do this setup?
> Thank you,
> —–Original Message—–
> From: omnisdev-en [mailto:email@example.com] On Behalf Of Jan Eskilsson
> Sent: Thursday, February 08, 2018 12:34 PM
> To: OmnisDev List – English
> Subject: Re: Some problems with stability – JS Application Server
> Hi Mayada and Stene
> We had similair problems with users compalaining from time to time that they cold not connect, we found 2 main reasons for this one was that the server was busy and the second that it had crashed.
> To solve this we have moved to similair setup as you, we have 4 omnis servers that are dedicated to only process backrground or long lasting jobs and 8 omnis servers behind an LSP that handles the web calls. We also dropped Windows Server 2012 in favour of Windows 2016 and all of a sudden the Omnis servers became really stable and rarely crashes. All the Omnis servers are restarted every night and since we run on Windows we also restart the hardware once a week.
> Since the move to this setup we haven’t had any connection issues at all and as a side effect we got a huge performance improvement. We have also found that its a good idea to have a couple less omnis servers than cores in the server otherwise the performance degrades. This makes sence ofcource since one Omnis server seems to never uses more than one core.
> Best Regards
> 2018-02-08 10:21 GMT+01:00 Sten-Erik Björling
>> Hi Mayada,
>> I have earlier done the script modifications in the template, a bit
>> uncertain about the use of the multiplier though. In the remote task I
>> have in the construct assigned a 60 minutes limit for inactivity and
>> in the destruct I have assigned 1 minute. These actions seems to have
>> resolved the problem so far – will stress test to the best of my
>> ability during the following days.
>> One note though…
>> It is important that the same changes are made to the jstempl in the
>> Omnis application html-folder since that eventually is involved in the
>> creation of the js-forms dynamically created by the server. I also
>> cleared out the earlier dynamically created js-files for the subforms
>> and then starting the Omnis app server.
>> I am running macOS X Server with Apache and Postgres – do not think I
>> can help in regard to the cron-jobs issue. Sorry… For those using
>> macOS X Server it is a good idea to look into different parameters to
>> increase performance of the server – Apple have really been setting
>> the parameters low.
>> Take care, all the best…
>>> 7 feb. 2018 kl. 22:10 skrev Mayada Al-Kishtini
>>> Look in the achieve for a thread with this subject ” JS Client app &
>> busy Omnis server”.
>>> The recommendation there solved various issues for me:
>>> In brief, I did these changes and things seemed to be running
>> for me (let’s keep our fingers crossed):
>>> 1- added onbeforeunload=”jOmnis.onUnload()” to your html template:
>>> So change this tag:
>>> >> “margin:0;overflow:auto”>
>>> To read :
>>> >> *onbeforeunload=”jOmnis.onUnload()” *style=”margin:0;overflow:auto”>
>>> 2- added a time out to my remote task to disconnect any idle
>> after 30 mins..you can adjust that based on your need to avoid running
>> out of licenses.
>>> Not sure if any of above solutions will solve your issue, but just
>> wanted to share my experience.
>>> We use IIS and not Apache..But I don’t think that will make a difference.
>>> More notes on this:
>>> I’m running now into some other issues (where the server is running
>> user can’t connect), our OS server runs a number of cron jobs and
>> handle web calls at the same time. I’m thinking that this is causing
>> some issues with connecting to the web form when the server is busy
>> with processing a job (which might be an http call to a third party
>> API and might take a long time to get the response or when it process a long list).
>>> So I’m investigating now the option of separating the jobs from the
>> calls. I started installing 2 servers at some sites, one to handle web
>> calls only and the other one (with no web configuration) will be
>> dedicated to process the jobs, so any issue there won’t affect the web
>> traffic. Still testing this approach.
>>> I also started installing a windows scheduled task on our sites to
>> and re-start the Omnis serer once daily to make sure that the server
>> is running until we manage to solve all its issues.
>>> I’ll appreciate if you could share any further solutions that you
>> find that help in solving the connection to your web app.
>> Sten-Erik Björling
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