Hello Julien, Without any patch, dmesg shows "segmentation fault". Currently, I have one node using patch set 1. It's been working without issues for over 24 hours with just one worker. I changed the configuration about 30 minutes ago, set workers = 2 and restarted. The gnocchi-metricd.log file shows that it is processing measures, but after a while gnocchi-metricd invoked oom-killer: [500580.805296] gnocchi-metricd invoked oom-killer: gfp_mask=0x280da, order=0, oom_score_adj=0 [500580.805307] gnocchi-metricd cpuset=/ mems_allowed=0 [500580.805318] CPU: 2 PID: 14524 Comm: gnocchi-metricd Tainted: G D 3.13.0-46-generic #75-Ubuntu [500580.805321] Hardware name: OpenStack Foundation OpenStack Nova, BIOS 1.7.5-20150310_111955-batsu 04/01/2014 [500580.805323] 0000000000000000 ffff8802aeab9a68 ffffffff817212c6 ffff8800a3b51800 [500580.805329] ffff8802aeab9af0 ffffffff8171bb81 0000000000000000 0000000000000000 [500580.805331] 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [500580.805333] Call Trace: [500580.805369] [] dump_stack+0x45/0x56 [500580.805375] [] dump_header+0x7f/0x1f1 [500580.805388] [] oom_kill_process+0x1ce/0x330 [500580.805403] [] ? security_capable_noaudit+0x15/0x20 [500580.805405] [] out_of_memory+0x414/0x450 [500580.805410] [] __alloc_pages_nodemask+0xa60/0xb80 [500580.805422] [] alloc_pages_vma+0x9a/0x140 [500580.805428] [] handle_mm_fault+0xb23/0xf00 [500580.805433] [] __do_page_fault+0x184/0x560 [500580.805436] [] ? change_protection+0x65/0xb0 [500580.805439] [] ? mprotect_fixup+0x151/0x290 [500580.805441] [] do_page_fault+0x1a/0x70 [500580.805444] [] do_async_page_fault+0x29/0xe0 [500580.805446] [] async_page_fault+0x28/0x30 [500580.805448] Mem-Info: [500580.805450] Node 0 DMA per-cpu: [500580.805451] CPU 0: hi: 0, btch: 1 usd: 0 [500580.805453] CPU 1: hi: 0, btch: 1 usd: 0 [500580.805454] CPU 2: hi: 0, btch: 1 usd: 0 [500580.805455] CPU 3: hi: 0, btch: 1 usd: 0 [500580.805455] Node 0 DMA32 per-cpu: [500580.805457] CPU 0: hi: 186, btch: 31 usd: 0 [500580.805458] CPU 1: hi: 186, btch: 31 usd: 0 [500580.805459] CPU 2: hi: 186, btch: 31 usd: 0 [500580.805460] CPU 3: hi: 186, btch: 31 usd: 169 [500580.805461] Node 0 Normal per-cpu: [500580.805462] CPU 0: hi: 186, btch: 31 usd: 73 [500580.805463] CPU 1: hi: 186, btch: 31 usd: 9 [500580.805464] CPU 2: hi: 186, btch: 31 usd: 0 [500580.805466] CPU 3: hi: 186, btch: 31 usd: 178 [500580.805469] active_anon:3994472 inactive_anon:134 isolated_anon:0 [500580.805469] active_file:160 inactive_file:332 isolated_file:0 [500580.805469] unevictable:0 dirty:0 writeback:0 unstable:0 [500580.805469] free:34674 slab_reclaimable:3233 slab_unreclaimable:5086 [500580.805469] mapped:206 shmem:160 pagetables:10093 bounce:0 [500580.805469] free_cma:0 [500580.805472] Node 0 DMA free:15908kB min:64kB low:80kB high:96kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15992kB managed:15908kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes [500580.805478] lowmem_reserve[]: 0 2847 15902 15902 [500580.805480] Node 0 DMA32 free:65580kB min:12088kB low:15108kB high:18132kB active_anon:2837216kB inactive_anon:100kB active_file:4kB inactive_file:4kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:3129212kB managed:2919140kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:124kB slab_reclaimable:1328kB slab_unreclaimable:3092kB kernel_stack:1024kB pagetables:8212kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:180 all_unreclaimable? yes [500580.805484] lowmem_reserve[]: 0 0 13054 13054 [500580.805486] Node 0 Normal free:57208kB min:55424kB low:69280kB high:83136kB active_anon:13140672kB inactive_anon:436kB active_file:636kB inactive_file:1324kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:13631488kB managed:13368116kB mlocked:0kB dirty:0kB writeback:0kB mapped:824kB shmem:516kB slab_reclaimable:11604kB slab_unreclaimable:17252kB kernel_stack:2752kB pagetables:32160kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:3027 all_unreclaimable? yes [500580.805489] lowmem_reserve[]: 0 0 0 0 [500580.805491] Node 0 DMA: 1*4kB (U) 0*8kB 0*16kB 1*32kB (U) 2*64kB (U) 1*128kB (U) 1*256kB (U) 0*512kB 1*1024kB (U) 1*2048kB (R) 3*4096kB (M) = 15908kB [500580.805503] Node 0 DMA32: 355*4kB (UEM) 163*8kB (UEM) 129*16kB (UEM) 64*32kB (UEM) 33*64kB (UE) 21*128kB (UEM) 29*256kB (UE) 19*512kB (UE) 18*1024kB (UE) 3*2048kB (M) 3*4096kB (MR) = 65652kB [500580.805512] Node 0 Normal: 298*4kB (UEM) 444*8kB (UE) 416*16kB (UEM) 232*32kB (UEM) 126*64kB (UEM) 52*128kB (UEM) 44*256kB (UEM) 16*512kB (UEM) 0*1024kB 0*2048kB 1*4096kB (R) = 57096kB [500580.805524] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB [500580.805525] 720 total pagecache pages [500580.805526] 0 pages in swap cache [500580.805527] Swap cache stats: add 0, delete 0, find 0/0 [500580.805528] Free swap = 0kB [500580.805529] Total swap = 0kB [500580.805530] 4194173 pages RAM [500580.805531] 0 pages HighMem/MovableOnly [500580.805532] 65843 pages reserved [500580.805532] [ pid ] uid tgid total_vm rss nr_ptes swapents oom_score_adj name [500580.805544] [ 386] 0 386 4868 69 13 0 0 upstart-udev-br [500580.805555] [ 402] 0 402 12443 190 27 0 -1000 systemd-udevd [500580.805557] [ 543] 0 543 3814 64 12 0 0 upstart-socket- [500580.805559] [ 583] 0 583 5855 71 17 0 0 rpcbind [500580.805561] [ 612] 108 612 5385 116 16 0 0 rpc.statd [500580.805563] [ 645] 0 645 2555 578 7 0 0 dhclient [500580.805565] [ 895] 102 895 9804 95 23 0 0 dbus-daemon [500580.805567] [ 911] 0 911 3818 66 12 0 0 upstart-file-br [500580.805569] [ 942] 0 942 10862 105 26 0 0 systemd-logind [500580.805571] [ 1041] 0 1041 3634 41 12 0 0 getty [500580.805573] [ 1043] 0 1043 3634 39 12 0 0 getty [500580.805574] [ 1045] 101 1045 65018 828 31 0 0 rsyslogd [500580.805576] [ 1046] 0 1046 6926 58 18 0 0 rpc.idmapd [500580.805578] [ 1051] 0 1051 3634 42 11 0 0 getty [500580.805580] [ 1053] 0 1053 3634 42 12 0 0 getty [500580.805582] [ 1055] 0 1055 3634 41 12 0 0 getty [500580.805584] [ 1086] 0 1086 15342 169 33 0 -1000 sshd [500580.805586] [ 1094] 0 1094 5913 71 18 0 0 cron [500580.805588] [ 1095] 0 1095 4784 43 13 0 0 atd [500580.805590] [ 1109] 0 1109 1091 36 8 0 0 acpid [500580.805591] [ 1184] 0 1184 4796 70 15 0 0 irqbalance [500580.805593] [ 1485] 107 1485 11417 702 26 0 0 snmpd [500580.805595] [ 1569] 0 1569 3634 40 12 0 0 getty [500580.805597] [ 1585] 0 1585 3196 40 12 0 0 getty [500580.805599] [ 1761] 106 1761 6804 157 18 0 0 ntpd [500580.805602] [12174] 0 12174 26408 264 54 0 0 sshd [500580.805604] [12262] 1000 12262 26408 259 52 0 0 sshd [500580.805605] [12263] 1000 12263 5397 563 15 0 0 bash [500580.805607] [12284] 0 12284 17492 127 39 0 0 sudo [500580.805609] [12285] 0 12285 16330 136 37 0 0 su [500580.805610] [12286] 0 12286 5420 613 15 0 0 bash [500580.805612] [ 1186] 0 1186 22118 447 46 0 0 apache2 [500580.805614] [ 1189] 1002 1189 716612 66971 440 0 0 apache2 [500580.805616] [ 1190] 1002 1190 715482 68849 427 0 0 apache2 [500580.805618] [ 1191] 1002 1191 724041 75264 494 0 0 apache2 [500580.805620] [ 1192] 33 1192 113314 2894 85 0 0 apache2 [500580.805621] [ 1193] 33 1193 113318 2815 85 0 0 apache2 [500580.805624] [29609] 0 29609 43845 11823 91 0 0 gnocchi-metricd [500580.805626] [29622] 0 29622 1230075 978831 2026 0 0 gnocchi-metricd [500580.805627] [29623] 0 29623 1684707 1460157 2963 0 0 gnocchi-metricd [500580.805629] [29624] 0 29624 1553637 1335219 2719 0 0 gnocchi-metricd [500580.805631] [ 6243] 33 6243 95832 1461 78 0 0 apache2 [500580.805633] Out of memory: Kill process 29623 (gnocchi-metricd) score 348 or sacrifice child [500580.807870] Killed process 29623 (gnocchi-metricd) total-vm:6738828kB, anon-rss:5840552kB, file-rss:76kB I mention segmentation fault because without patch or with patch set 3, dmesg shows that: [478185.652077] device eth0 entered promiscuous mode [478186.408662] device eth0 left promiscuous mode [499251.835729] gnocchi-metricd[29547]: segfault at f4 ip 00007f3d601cb0d0 sp 00007f3d5d997150 error 4 in librados.so.2.0.0[7f3d6011b000+53d000] [499541.640103] device eth0 entered promiscuous mode [499541.832630] device eth0 left promiscuous mode Please let me know what further information I can provide. Many thanks, kind regards.