so for example if there was an idle GPU and Q3 take it and then there is a task comes to Q2 which we specified 3GPU but now the Q3 is taken some of these GPU what will happen

yes Just i want to make sure it will work as intended so just queue 3 will take any idle GPU when there is a task to pull if there is no idle GPU will be 2 GPUs only

so for example if there was an idle GPU and Q3 take it and then there is a task comes to Q2 which we specified 3GPU but now the Q3 is taken some of these GPU what will happen

This is a standard "race" the first one to come will "grab" the GPU and the other will wait for it.
I'm pretty sure enterprise edition has preemption support, but this is not currently part of the open source version (btw: also the dynamic GPU allocation, I think, is part of the enterprise tier, in the opensource version the allocation is static, so in our case it would be static 3,3,2)

Hi WickedBee96

Queue1 will take 3GPUs, Queue2 will take another 3GPUs, so in Queue3 can I put 2-4 GPUs??

Yes exactly !

if there are idle GPUs so take them to process the task? o

Correct, basically you are saying, this queue needs a minimum of 2 GPUs, but if you have more allocate them to the Task it pulled (with a maximum of 45 GPUs)
Make sense ?