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Old 2020-04-02, 17:14   #3
If I May
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"Chris Halsall"
Sep 2002

243548 Posts

Originally Posted by mrk74 View Post
Does anybody know what the usage limits for Colab are? I've maybe let it go for 12 hrs a day for a few days. Haven't been able to connect to a GPU or TPU for about 14-15 hrs because of usage limits. All I get is "Unable to connect to the runtime."!
This is nominal behavior.

No one except Google (and perhaps not even their humans) know exactly what the usage limits are. They seem to change over time -- sometimes suddenly, sometimes gradually.

Here's my empirical: after the initial "honeymoon" of a Google (read: Gmail) ***account*** has started using Colab, the availability of a GPU tends to converge to get a single instance run once per day. Lately, they've been running about 7 to 10 hours, tending to the lower range.

Also, when the GPU availability window "opens" seems to be the same time each day. Some of my accounts get GPUs at around 1400 UTC, others not until around 2200. They are always offered (and get) a CPU instance if the GPU isn't available.

Originally Posted by mrk74 View Post
Would getting another key help or is it connected to the login? ANY help in understand is greatly appreciated!
Completely tied to the Gmail login. But Google doesn't seem to care how many accounts you use. I'm running eight (across three "humans" (read: VPNs)), and I'm on the free tier. I know at least one person on the paid tier running four concurrently, often almost 24/7.

Lastly, I've observed that new Colab users (even by a newly created Gmail account) initially gets about 12 hour runs of T4s or P100s, which can often immediately be relaunched. This lasts for two or three days, and then the usage is constrained as above.

May we live in interesting times...
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