topic Re: Reload Performance on virtual server in QlikView

Reload Performance on virtual server

maleksafa — Mon, 26 Jan 2026 18:19:17 GMT

Hi,

Lately we have moved the qlikview server into a virtual environment, we have 250GB RAM and more CPUs than the original server. however we have noticed a drawback in the reload performance, it is taking now more than 40-50% compared to physical server.

do you have any recommendation regarding virtual server configuration? or have you faced this drawback on virtual server and therefore it is not recommended?

Re: Reload Performance on virtual server

jerrysvensson — Fri, 15 May 2015 12:33:11 GMT

There exist a white paper, look here

Re: What is the current view on running Production QlikView on VMware and Are There Other Options?>

Re: Reload Performance on virtual server

Gabriel — Fri, 15 May 2015 12:42:36 GMT

Hi,

How many task are running at same time on the VM?

Re: Reload Performance on virtual server

jerrysvensson — Fri, 15 May 2015 12:57:52 GMT

It depends on how many cores you have.

The document from Qlik contains gudielines on how to configure the VMWare environment.

A VMWare setup with the same spec as a physical will always perform less. But you can come close if you set it up correct.

At my client we only use virtualization in development and test. Production runs on physical hardware.

Re: Reload Performance on virtual server

maleksafa — Fri, 15 May 2015 14:53:21 GMT

at the same time, you will not have more than 3-4 tasks running. however two of the tasks takes a lot of time to reload and uses 300million+ as total rows and contains heavy execution in the script, so the time for those 2 takes 12 hours and 5 hours.

Re: Reload Performance on virtual server

maleksafa — Fri, 15 May 2015 14:54:41 GMT

i have 32 cores of Intel(R) Xeon(R) CPU E5-2650 v3 @ 2.30GHz 2297MHz

Physical RAM(MB) 245759

Re: Reload Performance on virtual server

Gabriel — Fri, 15 May 2015 14:56:29 GMT

Hi,

Is this how long it took each task when you were on physical server?

Re: Reload Performance on virtual server

Anonymous — Fri, 15 May 2015 15:00:53 GMT

How many physical cores & how much physical RAM on the physical host server ?

How many other virtual servers on the physical host server and how many virtual cores & RAM on each of them ?

Re: Reload Performance on virtual server

maleksafa — Fri, 15 May 2015 15:02:09 GMT

no, this is the current number, they used to take 20-30% less time.

Re: Reload Performance on virtual server

Gabriel — Fri, 15 May 2015 15:12:01 GMT

Hi,

I don't know if you've seen this document before, but if you haven't then read through it might help you to answer your question

Re: Reload Performance on virtual server

maleksafa — Fri, 15 May 2015 15:27:11 GMT

How many physical cores & how much physical RAM on the physical host server ?

32 physical cores, 256 GB of RAM on the host server

How many other virtual servers on the physical host server and how many virtual cores & RAM on each of them ?

No other virtual server, the BI server is alone on the host.