> [!NOTE] ![[assets/wl_ipc_checkpointercomm.png|256]] > > | | | > | :--- | :--- | > | **Wait Category** | IPC | > | **Mechanism** | `Checkpointer` | > | **Operations** | [[Operations/Table/SeqScan]] | > | **Resources** | [[Resources/CPU|CPU]], [[Resources/RAM|Memory]] | > > **Inter-Process Communication Bottleneck**. Backends communicate with the checkpointer to request that specific files be synchronized to disk (fsync) or to trigger an immediate checkpoint.