I’m extremely confused about Circle’s terminology.
It looks like in the last week or so, Circle changed pricing model substantially. According to the pricing page, The free plan gets “up to 30 jobs at a time” (as of 10/29, it was 1 job at a time).
This is great, however I had one of my builds stuck: “The job was waitlisted due to Concurrency Limits”.
I could not for the life of my find what my concurrency limit was or what that error message was using to calculate what concurrency I was using. I went through everything I could find and was not running any job, no ssh jobs were stuck, nothing.
The error message said to check my plan. It does show I’m on the free plan with the ability to run 30 jobs at once.
So what gives? Is this just buggy or am I not understanding what “concurrent” means?
Hi @davetron5000! Usually, this error happens because of running SSH jobs. Check out this support article and see if it helps. I’m happy to answer follow up questions!
Thanks for the quick reply! I did see that article (I think you posted it to another person who had a similar question 
and went to the magic url. I even scrolled through all jobs and there was not a single ssh container running.
But supposing there was—wouldn’t there have to be 30 of them running to use up my concurrent job limit of 30 jobs?
I see what you mean. You should be able to run 30 jobs at the same time. I’m checking in with the team to get verification and have them take a look.
@davetron5000 This may have been part of an incident that is now resolved. You should definitely have 30 concurrent jobs available to you, and if you see that error again, please let me know.
OK, good to know. I haven’t seen this crop up again since, so that sounds like it was it. Thanks!!!
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@thekatertot Hi, I met the same problem.
One of my builds stuck: “The job was waitlisted due to Concurrency Limits”.
But I am not running any jobs. Can you help me? I will be very grateful.
Hi! I looked into this - it seems some people had access to resources (the GPU resource classes) that aren’t supposed to be enabled for free plans, and it was fixed earlier this week, which is probably why it’s not available anymore. I can work with open source projects specifically to try to get additional features, but not on individual free accounts. I hope this helps, and let me know what we can do!
I started using CircleCI this week, and always thought that the free plan could also use GPU.
It seems that I misunderstood, haha.
CircleCI is a great tool, I will still use it to perform CPU tests on my open source projects.
Can I get the “additional features” you mentioned?
@thekatertot BTW, which part of the document says that only paying users can use GPU machines?
I can’t find the related description.
The main pricing comparison page table currently states that you need to be a ‘Scale’ level customer to access both GPU–Nvidia and Windows GPU–Nvidia resource classes.
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It’s noted in the plan information that @rit1010 posted. Additional features are available for open source projects, but not for individuals. Thanks for your patience!