/ curl Public
tool_operate: prevent over-queuing in parallel mode #9389
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When doing a huge amount of parallel transfers, we must not add them to the per_transfer list frivolously since they all use memory after all. This was previous done without really considering millions or billions of transfers. Massive parallelism would use a lot of memory for no good purpose.
The queue is now limited to twice the parallelism number.
This makes the 'Qd' value in the parallel progress meter mostly useless for users, but works for now for us as a debug display.
Reported-by: justchen1369 on github