# Reader\_concurrency\_semaphore **URL:** \ **Category:** Database Community\ **Tags:** troubleshooting\ **Created:** [September 1, 2024, 5:12am UTC](https://forum.scylladb.com/t/reader-concurrency-semaphore/2833 "2024-09-01T05:12:02Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Daniel\_Stephen](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.scylladb.com/daniel_stephen/32/1138_2.png) [@Daniel\_Stephen](https://forum.scylladb.com/u/Daniel_Stephen)\ **Post date:** [September 1, 2024, 5:12am UTC](https://forum.scylladb.com/t/reader-concurrency-semaphore/2833/1 "2024-09-01T05:12:02Z")
Hi all, We are running 8 node cluster with scylladb 6.0 version. We could see below message from logs across all the nodes . But overall cpu(8 cores) usage was not much. And also we observed most of the times all 8 shards were 100% from the Load metrics(Scylla dashboard). Can someone help share your thoughts and how to fix it. **Log message** [shard 5:stmt] reader\_concurrency\_semaphore - (rate limiting dropped 584 similar messages) Semaphore user with 61/100 count and 11331744/166807470 memory resources: timed out, dumping permit diagnostics: permits count memory table/operation/state 2 2 581K in\_user\_history.recent\_recommended\_items/data-query/active/need\_cpu 1 0 0B in\_user\_history.recent\_page\_views/mutation-query/waiting\_for\_admission 27 0 0B in\_user\_history.recent\_recommended\_items/mutation-query/waiting\_for\_admission 132 0 0B in\_user\_history.recent\_page\_views/data-query/waiting\_for\_admission 228 0 0B in\_user\_history.recent\_recommended\_items/data-query/waiting\_for\_admission ---
**Author:** ![Botond\_Denes](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.scylladb.com/botond_denes/32/163_2.png) [@Botond\_Denes](https://forum.scylladb.com/u/Botond_Denes)\ **Post date:** [September 4, 2024, 6:36am UTC](https://forum.scylladb.com/t/reader-concurrency-semaphore/2833/2 "2024-09-04T06:36:01Z")
Looks like you overloaded ScyllaDB, at least when it comes to CPU. Try adding more nodes to the cluster, or reducing the load. Also, the report you posted seems incomplete. I says there are 61 count resources, but I only see 2 in the table below. Either parts are missing, or the table is from the a different report?