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On todays large systems, it's not always desired to run on all threads for light loads, and usually users enforce nbthread to a lower value (e.g. 8). The problem is that this is a fixed value, and moving such configs to smaller machines continues to enforce the value and this becomes extremely unproductive due to having more threads than CPUs. This also happens quite a bit in VMs, containers, or cloud instances of various sizes. This commit introduces the thread-hard-limit setting that allows to only set an upper bound to the number of threads without raising a lower value. This means that using "thread-hard-limit 8" will make sure that no more than 8 threads will be used when available, but it will remain two when run on a dual-core machine. |
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