fix: limit threads to 1 on riscv64

Author: kxxt

src/utils/configuration/index.mjs

@@ -33,7 +33,11 @@ export const getDefaultConfig = lazy(() =>
         }),
       },
 
-      threads: cpus().length,
+      // The number of wasm memory instances is severely limited on
+      // riscv64 with sv39. Running multiple generators that use wasm in
+      // parallel could cause failures to allocate new wasm instance.
+      // See also https://github.com/nodejs/node/pull/60591
+      threads: process.arch === 'riscv64' ? 1 : cpus().length,
       chunkSize: 10,
     })
   )