I was able reproduce it with this config a lot of time,4k randread, intel s3610 ssd, testing with a small rbd which can be keep in buffer memory. I think around 150-200k iops by osd, I was able to trigger it easily. auth_cluster_required = none auth_service_required = none auth_client_required = none filestore_xattr_use_omap = true osd_pool_default_min_size = 1 debug_lockdep = 0/0 debug_context = 0/0 debug_crush = 0/0 debug_buffer = 0/0 debug_timer = 0/0 debug_journaler = 0/0 debug_osd = 0/0 debug_optracker = 0/0 debug_objclass = 0/0 debug_filestore = 0/0 debug_journal = 0/0 debug_ms = 0/0 debug_monc = 0/0 debug_tp = 0/0 debug_auth = 0/0 debug_finisher = 0/0 debug_heartbeatmap = 0/0 debug_perfcounter = 0/0 debug_asok = 0/0 debug_throttle = 0/0 osd_op_threads = 5 filestore_op_threads = 4 osd_op_num_threads_per_shard = 2 osd_op_num_shards = 10 filestore_fd_cache_size = 64 filestore_fd_cache_shards = 32 ms_nocrc = true ms_dispatch_throttle_bytes = 0 cephx_sign_messages = false cephx_require_signatures = false throttler_perf_counter = false ms_crc_header = false ms_crc_data = false [osd] osd_client_message_size_cap = 0 osd_client_message_cap = 0 osd_enable_op_tracker = false ----- Mail original ----- De: "Curley, Matthew" <matthew.curley@xxxxxxx> À: "ceph-devel" <ceph-devel@xxxxxxxxxxxxxxx> Envoyé: Jeudi 1 Octobre 2015 17:32:49 Objet: Reproducing allocator performance differences We've been trying to reproduce the allocator performance impact on 4K random reads seen in the Hackathon (and more recent tests). At this point though, we're not seeing any significant difference between tcmalloc and jemalloc so we're looking for thoughts on what we're doing wrong. Or at least some suggestions to try out. More detail here: https://drive.google.com/file/d/0B2kp18maR7axTmU5WG9WclNKQlU/view?usp=sharing Thanks for any input! --MC -- 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 -- 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
