We have a load balanced site - Each server has 4 cores, and 8GB RAM, nothing resource contained apart from the pure CPU on that app pool.
When each server is handling around 300 concurrent users with around 170 requests/sec before the CPU is at 100% and we see a massive slow down.
Every static file request is passing to the UmbracoModule - so files in the media folder (which may be expected given the rewrite element), but also the css folder/images folder etc.
These are creating high CPU given the number of elements on the page
Lots of images are using ImageProcessor/ImageCropper.
My question is, is this performance normal? We used to have the same site on U6 and it handled this level of traffic with ease.
If you see issues with static files like CSS I would say your environment need additional configuration, have you also thought about using a CDN to offload the media requests from the application server?
Sorry, that's not the problem. I was wondering why all static files are being processed by Umbraco but the main issue is ImageProcessor.
It's not a shared environment - it's a dedicated 4 server LB for this site. It was fine last year on U6 but since a rebuild on U7 with ImageProcessor performance has dropped.
I think it is a config issue rather than an issue with ImageProcessor per se.
Advice on load testing / performance issues
We have a load balanced site - Each server has 4 cores, and 8GB RAM, nothing resource contained apart from the pure CPU on that app pool.
When each server is handling around 300 concurrent users with around 170 requests/sec before the CPU is at 100% and we see a massive slow down.
Every static file request is passing to the UmbracoModule - so files in the media folder (which may be expected given the rewrite element), but also the css folder/images folder etc.
These are creating high CPU given the number of elements on the page
Lots of images are using ImageProcessor/ImageCropper.
My question is, is this performance normal? We used to have the same site on U6 and it handled this level of traffic with ease.
Thanks in advance for any advice!
If you see issues with static files like CSS I would say your environment need additional configuration, have you also thought about using a CDN to offload the media requests from the application server?
Media requests are not for static files though. They all get run through ImageProcessor that pulls out the correct crop from a cache.
Yes but if you are seeing performance issues with CSS files then something isn't quite right. Are you in a shared environment?
Sorry, that's not the problem. I was wondering why all static files are being processed by Umbraco but the main issue is ImageProcessor.
It's not a shared environment - it's a dedicated 4 server LB for this site. It was fine last year on U6 but since a rebuild on U7 with ImageProcessor performance has dropped.
I think it is a config issue rather than an issue with ImageProcessor per se.
I think you are probably right, I don't think that there have been many changes since U6 in the image processing functionality.
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