Seeing major performance issues

*Posted this into a wrong forum, didn't realize 'Optimizations' meant something else, please move to appropriate forum.*

Hi there, we are evaluation nop commerce and so far we see major performance issues.

Our sites load tested on the main page can sustain few hundred thousand requests no problem. Nop seems to not be able to sustain a hundred users and cpu and memory utilization skyrockets.

CPU utilization spikes to 100% and doesn't go down until a bit after the load is over. So even though the test is finished, nop is still 100% cpu for a while and the site is not accessible.

Has nop been used on any sites with possibility of 100s of concurrent users?

Here is an example of memory utilization during load, that looks insane if you consider that all that's happening is user hitting up default page.

Found where the memory issue is coming from -

the issue is InsertGuestCustomer()

if I comment out InsertGuestCustomer, memory does not balloon any more

                //create guest if not exists
                if (customer == null || customer.Deleted || !customer.Active)
                {
                    //customer = _customerService.InsertGuestCustomer();
                    customer = new Customer { CustomerGuid = Guid.NewGuid() };
                }

This isn't a fix, I'm just trying to find where the issues are coming from. Seems like the call is doing a database insert and for whatever reason that's taking forever. It also seems to cache that insert action (hence, memory utilization) and process until done (app pool going nuts even after load is over).

vladk wrote:

You can install the trial version of dotTrace. This will allow you to get a very detailed report of where memory issues stem from.

What do you mean "cache the insert action...and process until done"?

skyler.severns wrote:

Already running a profiler, that's how I found that piece of code. So far all the speed/memory issues seem to stem from initially getting user (GetCurrentCustomer).

What I meant was that application pool is still chugging along because I believe the insert operations on database are still happening. It's not real time.

If I add

customer = _customerService.GetCustomerBySystemName(SystemCustomerNames.SearchEngine);

at the top of GetCurrentCustomer so that one user gets cached and no consecutive database calls are made, the page loads faster but cpu utilization is still 100% under moderate load.

Now trying a product page and cpu is still 100% after some F5s, app pool is almost 3 gigs. This is not going well :(

ProductsAlsoPurchased is killing perf on any product page that has that enabled.

This is kind of off topic from your original post, but what application/service are you using for loading testing?

Using wcat to do load testing but so far just holding F5 is killing nop so I guess real load testing is a bit overkill at this point.

On a big bad server memory issue did not appear but cpu is 100% on just hitting the main page with a load of 100 users.

I am also facing the same issue with nop 3.40 version. Did any one found a workaround for 100% CPU utilization ?