| --- |
| title: Thread Model |
| keywords: ["Thread"] |
| description: thread model |
| --- |
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| ## Description |
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| * This article gives an introduction to thread models in ShenYu and usage in various scenarios. |
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| ## IO And Work Thread |
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| * `spring-webflux` is one of dependencies of ShenYu, and it uses Netty thread model in lower layer. |
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| ## Business Thread |
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| * Use scheduling thread to execute by default. |
| * A fixed thread pool manages business threads, the number of threads is count in this formula: cpu * 2 + 1. |
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| ## Type Switching |
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| * `reactor.core.scheduler.Schedulers`. |
| * `-Dshenyu.scheduler.type=fixed` is a default config. If set to other value, a flexible thread pool will take place it.`Schedulers.elastic()`. |
| * `-Dshenyu.work.threads = xx` is for configuring number of threads, the default value calculates in following formula `cpu * 2 + 1` with a minimum of 16 threads. |
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