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doris/be/src/runtime
yinzhijian 936da4f10a [feature](thread-pool) Support thread pool per disk for scanners (#7994)
Support thread pool per disk for scanners to prevent pool performance from some high ioutil disks happening

key point:
1. each disk has a thread pool for scanners
2. whenever a thread pool of one disk runs out of local work, tasks can be retrieved from other threads(disks). This is done round-robin.

performance testing: 
vec version: 25% faster than single thread pool in a high io util disk test case
normal version: 8% faster than single thread pool in a high io util disk test case
2022-02-18 09:40:58 +08:00
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