On Tue, 13 Dec 2016, Dong Wu wrote: > Hi, all > I have a cluster with nearly 1000 osds, and each osd already > occupied 2.5G physical memory on average, which cause each host 90% > memory useage. when use tcmalloc, we can use "ceph tell osd.* release" > to release unused memory, but in my cluster, ceph is build with > jemalloc, so can't use "ceph tell osd.* release", is there any methods > to release some memory? We explicitly call into tcmalloc to release memory with that command, but unless you've patched something in yourself there is no integration with jemalloc's release API. > another question: > can I decrease the following config value which used for cached osdmap > to lower osd's memory? > > "mon_min_osdmap_epochs": "500" > "osd_map_max_advance": "200", > "osd_map_cache_size": "500", > "osd_map_message_max": "100", > "osd_map_share_max_epochs": "100" Yeah. You should be fine with 500, 50, 100, 50, 50. sage -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
