# Coprocessor（A）

+ Grafana —> TikV-Details —> Thread CPU —> Unified Read Pool CPU
  + Unified read pool CPU is higher than other TiKV nodes for nearly 1 hour from 21:20 ~ 22:20
  + Low overall utilization

![left](./student-guide/diagram/27-Coprocessor-01-01.png)
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Grafana —> TikV-Details —> Thread CPU —> Unified Read Pool CPU
Unified read pool CPU: CPU usage of the coprocessor thread. It is a coprocessor thread pool merged with the Storage Read Pool (starting with TiKV 5.0, newly installed clusters, all read request are queried through a unified thread pool by default), and all read request include kv get, kv batch get, raw kv get, The coprocessor, etc., will all be executed in this thread pool. The parameter readpool.unified.max-thread-count controls the thread pool size, which by default is 80% of the number of CPU on the machine.
For example, 18:20181 TiKV from 21:20 ~ 22:20 for nearly 1 hour Unified read pool CPU is higher than other TiKV nodes