# \#seastar

**URL:** https://forum.scylladb.com/tag/seastar/103.md

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## [Does Seastar use one thread per core?](https://forum.scylladb.com/t/does-seastar-use-one-thread-per-core/5041)

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**Author:** [@Anna](https://forum.scylladb.com/u/Anna)\
**Replies:** 1\
**Last updated:** [August 6, 2025, 4:51am UTC](https://forum.scylladb.com/t/does-seastar-use-one-thread-per-core/5041 "2025-08-06T04:51:16Z")

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I thought that ScyllaDB’s underlying Seastar framework uses one thread per core, but I see more than two threads per core. Why is that?

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## [Seastar-addr2line appears broken in official images](https://forum.scylladb.com/t/seastar-addr2line-appears-broken-in-official-images/2999)

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**Author:** [@prtolo](https://forum.scylladb.com/u/prtolo)\
**Replies:** 3\
**Last updated:** [October 6, 2024, 6:35am UTC](https://forum.scylladb.com/t/seastar-addr2line-appears-broken-in-official-images/2999 "2024-10-06T06:35:02Z")

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Trying to run seastar-addr2line to decode a traceback in logs, It fails to run with the error below. Is this something that broke with the recent python3 changes, or am I holding it wrong? Tried on 6.0.3 docker image, 6…

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## [Seastar - assertion \`thread' failed](https://forum.scylladb.com/t/seastar-assertion-thread-failed/2926)

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**Author:** [@Alex\_Q](https://forum.scylladb.com/u/Alex_Q)\
**Replies:** 2\
**Last updated:** [September 24, 2024, 5:28am UTC](https://forum.scylladb.com/t/seastar-assertion-thread-failed/2926 "2024-09-24T05:28:10Z")

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Hello everyone, The question is more about seastar programming but since it connected to ScyllaDB development would ask here. Could please somebody explain me the situation: when I use construction similar to this sea…

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## [Cant start on VPS that does enough memory?](https://forum.scylladb.com/t/cant-start-on-vps-that-does-enough-memory/2310)

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**Author:** [@Jay](https://forum.scylladb.com/u/Jay)\
**Replies:** 1\
**Last updated:** [July 17, 2024, 5:14am UTC](https://forum.scylladb.com/t/cant-start-on-vps-that-does-enough-memory/2310 "2024-07-17T05:14:15Z")

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I am starting scylla for on a VPS for a very small project, when I configure with 1 cpu and 500M or even 750M scylla refuses to start, even with --cpuset 1 setup and with/without --overprovisioned scylla\[5761\]: command …

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## [Aggregate shard level metrics to node level](https://forum.scylladb.com/t/aggregate-shard-level-metrics-to-node-level/1476)

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**Author:** [@qiuqiu](https://forum.scylladb.com/u/qiuqiu)\
**Replies:** 1\
**Last updated:** [April 12, 2024, 7:50pm UTC](https://forum.scylladb.com/t/aggregate-shard-level-metrics-to-node-level/1476 "2024-04-12T19:50:23Z")

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Does there support to use metric\_family\_config to aggregate shard level metrics to node level by API ? And How ? Because I see here Adding Metrics family config by amnonh · Pull Request #2121 · scylladb/seastar · GitHub …

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## [Seastar httpd example](https://forum.scylladb.com/t/seastar-httpd-example/1326)

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**Author:** [@L\_Ait](https://forum.scylladb.com/u/L_Ait)\
**Replies:** 2\
**Last updated:** [April 9, 2024, 7:35am UTC](https://forum.scylladb.com/t/seastar-httpd-example/1326 "2024-04-09T07:35:52Z")

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I am building simple httpd application example in apps. I wonder if http source in seastar handles json body when sending post request and if not if there are some projects that do so : scylladb database, etc? Thanks