Add Guidance for GCS Fuse for Compilation Cache in JAX

docs/persistent_compilation_cache.md

@@ -132,6 +132,34 @@ Cloud Storage (GCS) bucket. We recommend the following configuration:
 
 *  All encryption policies are supported.
 
+It is **recommended** to use
+[Google Cloud Storage Fuse](https://cloud.google.com/storage/docs/cloud-storage-fuse)
+to mount the GCS bucket as a local directory. This is because when running JAX
+in a multi-node setup, multiple nodes might try to write to the cache
+simultaneously, leading to GCS rate-limit errors. GCSFuse handles this by
+ensuring that only one process can write to a file at a time, preventing these
+errors.
+
+To set up GCSFuse, follow instructions for
+[GCE](https://cloud.google.com/storage/docs/cloud-storage-fuse/mount-bucket) or
+[GKE](https://cloud.google.com/kubernetes-engine/docs/how-to/cloud-storage-fuse-csi-driver-setup).
+For better performance, enable file caching
+([GCE](https://cloud.google.com/storage/docs/cloud-storage-fuse/file-caching) and
+[GKE](https://cloud.google.com/kubernetes-engine/docs/how-to/cloud-storage-fuse-csi-driver-perf#enable-and-use-file-caching)).
+
+Once GCSFuse is configured, set the JAX cache directory to the GCSFuse mount
+point:
+
+```python
+# Example assuming the GCS bucket is mounted at /gcs/my-bucket
+jax.config.update("jax_compilation_cache_dir", "/gcs/my-bucket/jax-cache")
+```
+
+**Direct GCS access :**
+
+If you choose not to use GCSFuse, you can point the cache directly to a GCS
+bucket.
+
 Assuming that `gs://jax-cache` is the GCS bucket, set cache location as
 follows: