+ COMMAND=start + start + exec uwsgi --ini /etc/nova/nova-api-uwsgi.ini [uWSGI] getting INI configuration from /etc/nova/nova-api-uwsgi.ini *** Starting uWSGI 2.0.31 (64bit) on [Wed Aug 5 22:05:28 2026] *** compiled with version: 13.3.0 on 02 June 2026 01:55:00 os: Linux-5.15.0-186-generic #196-Ubuntu SMP Sat Jun 20 16:09:34 UTC 2026 nodename: nova-api-osapi-6fbbc54fd6-5dcq4 machine: x86_64 clock source: unix pcre jit disabled detected number of CPU cores: 16 current working directory: / detected binary path: /var/lib/openstack/bin/uwsgi *** dumping internal routing table *** [rule: 0] subject: user_agent regexp: ^kube-probe.* action: donotlog: *** end of the internal routing table *** your memory page size is 4096 bytes detected max file descriptor number: 1048576 lock engine: pthread robust mutexes thunder lock: enabled uwsgi socket 0 bound to TCP address 0.0.0.0:8774 fd 3 Python version: 3.12.3 (main, Mar 3 2026, 12:15:18) [GCC 13.3.0] Python main interpreter initialized at 0x7fc7fe778668 python threads support enabled your server socket listen backlog is limited to 100 connections your mercy for graceful operations on workers is 80 seconds mapped 403077 bytes (393 KB) for 2 cores *** Operational MODE: preforking *** *** uWSGI is running in multiple interpreter mode *** spawned uWSGI master process (pid: 1) spawned uWSGI worker 1 (pid: 7, cores: 1) spawned uWSGI worker 2 (pid: 8, cores: 1) running "unix_signal:15 gracefully_kill_them_all" (master-start)... 2026-08-05 22:05:32.986 7 INFO nova.utils [None req-b6c7c9e1-14be-4143-a47d-8ef1217aa92c - - - - - -] The cell worker thread pool MainProcess.cell_worker is initialized 2026-08-05 22:05:33.020 8 INFO nova.utils [None req-5fd4e32c-2cd3-484e-9a97-a906666760a7 - - - - - -] The cell worker thread pool MainProcess.cell_worker is initialized 2026-08-05 22:05:34.745 8 WARNING keystonemiddleware._common.config [None req-5fd4e32c-2cd3-484e-9a97-a906666760a7 - - - - - -] The option "audit_map_file" is not known to keystonemiddleware 2026-08-05 22:05:34.753 8 WARNING keystonemiddleware.auth_token [None req-5fd4e32c-2cd3-484e-9a97-a906666760a7 - - - - - -] Configuring www_authenticate_uri to point to the public identity endpoint is required; clients may not be able to authenticate against an admin endpoint 2026-08-05 22:05:34.797 7 WARNING keystonemiddleware._common.config [None req-b6c7c9e1-14be-4143-a47d-8ef1217aa92c - - - - - -] The option "audit_map_file" is not known to keystonemiddleware 2026-08-05 22:05:34.809 7 WARNING keystonemiddleware.auth_token [None req-b6c7c9e1-14be-4143-a47d-8ef1217aa92c - - - - - -] Configuring www_authenticate_uri to point to the public identity endpoint is required; clients may not be able to authenticate against an admin endpoint 2026-08-05 22:05:34.826 8 WARNING keystonemiddleware._common.config [None req-5fd4e32c-2cd3-484e-9a97-a906666760a7 - - - - - -] The option "audit_map_file" is not known to keystonemiddleware 2026-08-05 22:05:34.833 8 WARNING keystonemiddleware.auth_token [None req-5fd4e32c-2cd3-484e-9a97-a906666760a7 - - - - - -] Configuring www_authenticate_uri to point to the public identity endpoint is required; clients may not be able to authenticate against an admin endpoint 2026-08-05 22:05:34.845 8 WARNING oslo_config.cfg [None req-5fd4e32c-2cd3-484e-9a97-a906666760a7 - - - - - -] Deprecated: Option "api_servers" from group "glance" is deprecated for removal ( Support for image service configuration via standard keystoneauth1 Adapter options was added in the 17.0.0 Queens release. The api_servers option was retained temporarily to allow consumers time to cut over to a real load balancing solution. ). Its value may be silently ignored in the future. WSGI app 0 (mountpoint='') ready in 6 seconds on interpreter 0x7fc7fe778668 pid: 8 (default app) 2026-08-05 22:05:34.878 7 WARNING keystonemiddleware._common.config [None req-b6c7c9e1-14be-4143-a47d-8ef1217aa92c - - - - - -] The option "audit_map_file" is not known to keystonemiddleware 2026-08-05 22:05:34.885 7 WARNING keystonemiddleware.auth_token [None req-b6c7c9e1-14be-4143-a47d-8ef1217aa92c - - - - - -] Configuring www_authenticate_uri to point to the public identity endpoint is required; clients may not be able to authenticate against an admin endpoint 2026-08-05 22:05:34.894 7 WARNING oslo_config.cfg [None req-b6c7c9e1-14be-4143-a47d-8ef1217aa92c - - - - - -] Deprecated: Option "api_servers" from group "glance" is deprecated for removal ( Support for image service configuration via standard keystoneauth1 Adapter options was added in the 17.0.0 Queens release. The api_servers option was retained temporarily to allow consumers time to cut over to a real load balancing solution. ). Its value may be silently ignored in the future. WSGI app 0 (mountpoint='') ready in 6 seconds on interpreter 0x7fc7fe778668 pid: 7 (default app) [pid: 7|app: 0|req: 2/3] 199.19.213.150 () {42 vars in 705 bytes} [Wed Aug 5 22:05:41 2026] GET /v2.1 => generated 114 bytes in 19 msecs (HTTP/1.1 401) 6 headers in 319 bytes (1 switches on core 0) /var/lib/openstack/lib/python3.12/site-packages/pycadf/identifier.py:70: UserWarning: Invalid uuid: unknown. To ensure interoperability, identifiers should be a valid uuid. warnings.warn(('Invalid uuid: %s. To ensure interoperability, ' [pid: 8|app: 0|req: 2/4] 199.19.213.150 () {44 vars in 909 bytes} [Wed Aug 5 22:05:41 2026] GET /v2.1 => generated 0 bytes in 617 msecs (HTTP/1.1 302) 5 headers in 266 bytes (0 switches on core 0) /var/lib/openstack/lib/python3.12/site-packages/pycadf/identifier.py:70: UserWarning: Invalid uuid: unknown. To ensure interoperability, identifiers should be a valid uuid. warnings.warn(('Invalid uuid: %s. To ensure interoperability, ' [pid: 7|app: 0|req: 3/5] 199.19.213.150 () {46 vars in 982 bytes} [Wed Aug 5 22:05:42 2026] GET /v2.1/ => generated 400 bytes in 130 msecs (HTTP/1.1 200) 9 headers in 357 bytes (1 switches on core 0) 2026-08-05 22:05:42.456 8 INFO nova.api.openstack.wsgi [None req-a8246b82-b660-4a8a-8a45-500d8bae6146 214a6a6b15b34f6f9b68f673ce29f925 f97dc100bdc242f1bc3a059240af86e9 - - default default] HTTP exception thrown: Flavor m1.tiny could not be found. [pid: 8|app: 0|req: 3/6] 199.19.213.150 () {48 vars in 1011 bytes} [Wed Aug 5 22:05:42 2026] GET /v2.1/flavors/m1.tiny => generated 80 bytes in 75 msecs (HTTP/1.1 404) 9 headers in 380 bytes (1 switches on core 0) [pid: 7|app: 0|req: 4/7] 199.19.213.150 () {48 vars in 1051 bytes} [Wed Aug 5 22:05:42 2026] GET /v2.1/flavors/detail?is_public=None => generated 15 bytes in 23 msecs (HTTP/1.1 200) 9 headers in 358 bytes (1 switches on core 0) [pid: 8|app: 0|req: 4/8] 199.19.213.150 () {52 vars in 1048 bytes} [Wed Aug 5 22:05:42 2026] POST /v2.1/flavors => generated 529 bytes in 55 msecs (HTTP/1.1 200) 9 headers in 359 bytes (1 switches on core 0) [pid: 7|app: 0|req: 5/9] 199.19.213.150 () {42 vars in 705 bytes} [Wed Aug 5 22:05:43 2026] GET /v2.1 => generated 114 bytes in 1 msecs (HTTP/1.1 401) 6 headers in 319 bytes (1 switches on core 0) [pid: 8|app: 0|req: 5/10] 199.19.213.150 () {44 vars in 909 bytes} [Wed Aug 5 22:05:43 2026] GET /v2.1 => generated 0 bytes in 39 msecs (HTTP/1.1 302) 5 headers in 266 bytes (0 switches on core 0) [pid: 7|app: 0|req: 6/11] 199.19.213.150 () {46 vars in 982 bytes} [Wed Aug 5 22:05:43 2026] GET /v2.1/ => generated 400 bytes in 16 msecs (HTTP/1.1 200) 9 headers in 357 bytes (1 switches on core 0) 2026-08-05 22:05:43.625 8 INFO nova.api.openstack.wsgi [None req-f33b3193-7b71-4c94-9b48-88cfbe0755b7 214a6a6b15b34f6f9b68f673ce29f925 f97dc100bdc242f1bc3a059240af86e9 - - default default] HTTP exception thrown: Flavor m1.small could not be found. [pid: 8|app: 0|req: 6/12] 199.19.213.150 () {48 vars in 1013 bytes} [Wed Aug 5 22:05:43 2026] GET /v2.1/flavors/m1.small => generated 81 bytes in 15 msecs (HTTP/1.1 404) 9 headers in 380 bytes (1 switches on core 0) [pid: 7|app: 0|req: 7/13] 199.19.213.150 () {48 vars in 1051 bytes} [Wed Aug 5 22:05:43 2026] GET /v2.1/flavors/detail?is_public=None => generated 532 bytes in 18 msecs (HTTP/1.1 200) 9 headers in 359 bytes (1 switches on core 0) [pid: 8|app: 0|req: 7/14] 199.19.213.150 () {52 vars in 1048 bytes} [Wed Aug 5 22:05:43 2026] POST /v2.1/flavors => generated 532 bytes in 47 msecs (HTTP/1.1 200) 9 headers in 359 bytes (1 switches on core 0) [pid: 7|app: 0|req: 8/15] 199.19.213.150 () {42 vars in 705 bytes} [Wed Aug 5 22:05:44 2026] GET /v2.1 => generated 114 bytes in 1 msecs (HTTP/1.1 401) 6 headers in 319 bytes (1 switches on core 0) [pid: 8|app: 0|req: 8/16] 199.19.213.150 () {44 vars in 909 bytes} [Wed Aug 5 22:05:44 2026] GET /v2.1 => generated 0 bytes in 36 msecs (HTTP/1.1 302) 5 headers in 266 bytes (0 switches on core 0) [pid: 7|app: 0|req: 9/17] 199.19.213.150 () {46 vars in 982 bytes} [Wed Aug 5 22:05:44 2026] GET /v2.1/ => generated 400 bytes in 9 msecs (HTTP/1.1 200) 9 headers in 357 bytes (1 switches on core 0) 2026-08-05 22:05:44.661 8 INFO nova.api.openstack.wsgi [None req-2d52d591-06ee-445c-828a-621b0627b663 214a6a6b15b34f6f9b68f673ce29f925 f97dc100bdc242f1bc3a059240af86e9 - - default default] HTTP exception thrown: Flavor m1.medium could not be found. [pid: 8|app: 0|req: 9/18] 199.19.213.150 () {48 vars in 1015 bytes} [Wed Aug 5 22:05:44 2026] GET /v2.1/flavors/m1.medium => generated 82 bytes in 17 msecs (HTTP/1.1 404) 9 headers in 380 bytes (1 switches on core 0) [pid: 7|app: 0|req: 10/19] 199.19.213.150 () {48 vars in 1051 bytes} [Wed Aug 5 22:05:44 2026] GET /v2.1/flavors/detail?is_public=None => generated 1054 bytes in 16 msecs (HTTP/1.1 200) 9 headers in 360 bytes (1 switches on core 0) [pid: 8|app: 0|req: 10/20] 199.19.213.150 () {52 vars in 1048 bytes} [Wed Aug 5 22:05:44 2026] POST /v2.1/flavors => generated 533 bytes in 27 msecs (HTTP/1.1 200) 9 headers in 359 bytes (1 switches on core 0) [pid: 7|app: 0|req: 11/21] 199.19.213.150 () {42 vars in 705 bytes} [Wed Aug 5 22:05:45 2026] GET /v2.1 => generated 114 bytes in 1 msecs (HTTP/1.1 401) 6 headers in 319 bytes (1 switches on core 0) [pid: 8|app: 0|req: 11/22] 199.19.213.150 () {44 vars in 909 bytes} [Wed Aug 5 22:05:45 2026] GET /v2.1 => generated 0 bytes in 35 msecs (HTTP/1.1 302) 5 headers in 266 bytes (0 switches on core 0) [pid: 7|app: 0|req: 12/23] 199.19.213.150 () {46 vars in 982 bytes} [Wed Aug 5 22:05:45 2026] GET /v2.1/ => generated 400 bytes in 12 msecs (HTTP/1.1 200) 9 headers in 357 bytes (1 switches on core 0) 2026-08-05 22:05:45.596 8 INFO nova.api.openstack.wsgi [None req-4733eff3-82a5-4b82-9f36-22f7761dca65 214a6a6b15b34f6f9b68f673ce29f925 f97dc100bdc242f1bc3a059240af86e9 - - default default] HTTP exception thrown: Flavor m1.large could not be found. [pid: 8|app: 0|req: 12/24] 199.19.213.150 () {48 vars in 1013 bytes} [Wed Aug 5 22:05:45 2026] GET /v2.1/flavors/m1.large => generated 81 bytes in 11 msecs (HTTP/1.1 404) 9 headers in 380 bytes (1 switches on core 0) [pid: 7|app: 0|req: 13/25] 199.19.213.150 () {48 vars in 1051 bytes} [Wed Aug 5 22:05:45 2026] GET /v2.1/flavors/detail?is_public=None => generated 1577 bytes in 16 msecs (HTTP/1.1 200) 9 headers in 360 bytes (1 switches on core 0) [pid: 8|app: 0|req: 13/26] 199.19.213.150 () {52 vars in 1048 bytes} [Wed Aug 5 22:05:45 2026] POST /v2.1/flavors => generated 532 bytes in 22 msecs (HTTP/1.1 200) 9 headers in 359 bytes (1 switches on core 0) [pid: 7|app: 0|req: 14/27] 199.19.213.150 () {42 vars in 705 bytes} [Wed Aug 5 22:05:46 2026] GET /v2.1 => generated 114 bytes in 1 msecs (HTTP/1.1 401) 6 headers in 319 bytes (1 switches on core 0) [pid: 8|app: 0|req: 14/28] 199.19.213.150 () {44 vars in 909 bytes} [Wed Aug 5 22:05:46 2026] GET /v2.1 => generated 0 bytes in 33 msecs (HTTP/1.1 302) 5 headers in 266 bytes (0 switches on core 0) [pid: 7|app: 0|req: 15/29] 199.19.213.150 () {46 vars in 982 bytes} [Wed Aug 5 22:05:46 2026] GET /v2.1/ => generated 400 bytes in 10 msecs (HTTP/1.1 200) 9 headers in 357 bytes (1 switches on core 0) 2026-08-05 22:05:46.535 8 INFO nova.api.openstack.wsgi [None req-12c962c7-d2e2-46b6-9877-271bf54ee3a6 214a6a6b15b34f6f9b68f673ce29f925 f97dc100bdc242f1bc3a059240af86e9 - - default default] HTTP exception thrown: Flavor m1.xlarge could not be found. [pid: 8|app: 0|req: 15/30] 199.19.213.150 () {48 vars in 1015 bytes} [Wed Aug 5 22:05:46 2026] GET /v2.1/flavors/m1.xlarge => generated 82 bytes in 15 msecs (HTTP/1.1 404) 9 headers in 380 bytes (1 switches on core 0) [pid: 7|app: 0|req: 16/31] 199.19.213.150 () {48 vars in 1051 bytes} [Wed Aug 5 22:05:46 2026] GET /v2.1/flavors/detail?is_public=None => generated 2099 bytes in 22 msecs (HTTP/1.1 200) 9 headers in 360 bytes (1 switches on core 0) [pid: 8|app: 0|req: 16/32] 199.19.213.150 () {52 vars in 1048 bytes} [Wed Aug 5 22:05:46 2026] POST /v2.1/flavors => generated 535 bytes in 28 msecs (HTTP/1.1 200) 9 headers in 359 bytes (1 switches on core 0) [pid: 7|app: 0|req: 57/113] 10.0.0.10 () {28 vars in 454 bytes} [Wed Aug 5 22:12:20 2026] GET /v2.1 => generated 114 bytes in 2 msecs (HTTP/1.1 401) 6 headers in 319 bytes (1 switches on core 0) /var/lib/openstack/lib/python3.12/site-packages/pycadf/identifier.py:70: UserWarning: Invalid uuid: nova. To ensure interoperability, identifiers should be a valid uuid. warnings.warn(('Invalid uuid: %s. To ensure interoperability, ' [pid: 8|app: 0|req: 57/114] 10.0.0.10 () {30 vars in 658 bytes} [Wed Aug 5 22:12:20 2026] GET /v2.1 => generated 0 bytes in 178 msecs (HTTP/1.1 302) 5 headers in 277 bytes (0 switches on core 0) /var/lib/openstack/lib/python3.12/site-packages/pycadf/identifier.py:70: UserWarning: Invalid uuid: nova. To ensure interoperability, identifiers should be a valid uuid. warnings.warn(('Invalid uuid: %s. To ensure interoperability, ' [pid: 7|app: 0|req: 58/115] 10.0.0.10 () {32 vars in 731 bytes} [Wed Aug 5 22:12:20 2026] GET /v2.1/ => generated 411 bytes in 21 msecs (HTTP/1.1 200) 9 headers in 357 bytes (1 switches on core 0) [pid: 8|app: 0|req: 58/116] 10.0.0.10 () {34 vars in 804 bytes} [Wed Aug 5 22:12:20 2026] GET /v2.1/os-services?binary=nova-compute => generated 251 bytes in 123 msecs (HTTP/1.1 200) 9 headers in 359 bytes (1 switches on core 0) [pid: 7|app: 0|req: 77/153] 199.19.213.150 () {42 vars in 705 bytes} [Wed Aug 5 22:15:22 2026] GET /v2.1 => generated 114 bytes in 2 msecs (HTTP/1.1 401) 6 headers in 319 bytes (1 switches on core 0) /var/lib/openstack/lib/python3.12/site-packages/pycadf/identifier.py:70: UserWarning: Invalid uuid: unknown. To ensure interoperability, identifiers should be a valid uuid. warnings.warn(('Invalid uuid: %s. To ensure interoperability, ' [pid: 8|app: 0|req: 77/154] 199.19.213.150 () {44 vars in 909 bytes} [Wed Aug 5 22:15:22 2026] GET /v2.1 => generated 0 bytes in 114 msecs (HTTP/1.1 302) 5 headers in 266 bytes (0 switches on core 0) [pid: 7|app: 0|req: 78/155] 199.19.213.150 () {46 vars in 982 bytes} [Wed Aug 5 22:15:22 2026] GET /v2.1/ => generated 400 bytes in 14 msecs (HTTP/1.1 200) 9 headers in 357 bytes (1 switches on core 0) 2026-08-05 22:15:22.555 8 INFO nova.api.openstack.wsgi [None req-5ce1be23-bf89-4206-967b-86a1f50d1c08 214a6a6b15b34f6f9b68f673ce29f925 f97dc100bdc242f1bc3a059240af86e9 - - default default] HTTP exception thrown: Flavor m1.amphora could not be found. [pid: 8|app: 0|req: 78/156] 199.19.213.150 () {48 vars in 1017 bytes} [Wed Aug 5 22:15:22 2026] GET /v2.1/flavors/m1.amphora => generated 83 bytes in 14 msecs (HTTP/1.1 404) 9 headers in 380 bytes (1 switches on core 0) [pid: 7|app: 0|req: 79/157] 199.19.213.150 () {48 vars in 1051 bytes} [Wed Aug 5 22:15:22 2026] GET /v2.1/flavors/detail?is_public=None => generated 2624 bytes in 26 msecs (HTTP/1.1 200) 9 headers in 360 bytes (1 switches on core 0) [pid: 8|app: 0|req: 79/158] 199.19.213.150 () {52 vars in 1049 bytes} [Wed Aug 5 22:15:22 2026] POST /v2.1/flavors => generated 534 bytes in 28 msecs (HTTP/1.1 200) 9 headers in 359 bytes (1 switches on core 0) [pid: 7|app: 0|req: 86/171] 199.19.213.150 () {42 vars in 705 bytes} [Wed Aug 5 22:16:20 2026] GET /v2.1 => generated 114 bytes in 1 msecs (HTTP/1.1 401) 6 headers in 319 bytes (1 switches on core 0) [pid: 8|app: 0|req: 86/172] 199.19.213.150 () {44 vars in 909 bytes} [Wed Aug 5 22:16:20 2026] GET /v2.1 => generated 0 bytes in 43 msecs (HTTP/1.1 302) 5 headers in 266 bytes (0 switches on core 0) [pid: 7|app: 0|req: 87/173] 199.19.213.150 () {46 vars in 982 bytes} [Wed Aug 5 22:16:20 2026] GET /v2.1/ => generated 400 bytes in 10 msecs (HTTP/1.1 200) 9 headers in 357 bytes (1 switches on core 0) 2026-08-05 22:16:20.588 8 INFO nova.api.openstack.wsgi [None req-06e9c4bb-84d9-42de-b685-e96b4447f1fc 214a6a6b15b34f6f9b68f673ce29f925 f97dc100bdc242f1bc3a059240af86e9 - - default default] HTTP exception thrown: Keypair octavia-amphora-ssh-key not found for user 214a6a6b15b34f6f9b68f673ce29f925 [pid: 8|app: 0|req: 87/174] 199.19.213.150 () {48 vars in 1051 bytes} [Wed Aug 5 22:16:20 2026] GET /v2.1/os-keypairs/octavia-amphora-ssh-key => generated 129 bytes in 21 msecs (HTTP/1.1 404) 9 headers in 381 bytes (1 switches on core 0) 2026-08-05 22:16:20.603 7 WARNING oslo_db.sqlalchemy.utils [None req-a223fe38-74ee-4bb7-aed4-48f81c43ffc8 214a6a6b15b34f6f9b68f673ce29f925 f97dc100bdc242f1bc3a059240af86e9 - - default default] Unique keys not in sort_keys. The sorting order may be unstable. [pid: 7|app: 0|req: 88/175] 199.19.213.150 () {48 vars in 1016 bytes} [Wed Aug 5 22:16:20 2026] GET /v2.1/os-keypairs => generated 16 bytes in 15 msecs (HTTP/1.1 200) 9 headers in 358 bytes (1 switches on core 0) [pid: 8|app: 0|req: 88/176] 199.19.213.150 () {52 vars in 1057 bytes} [Wed Aug 5 22:16:20 2026] POST /v2.1/os-keypairs => generated 576 bytes in 117 msecs (HTTP/1.1 201) 9 headers in 364 bytes (1 switches on core 0) [pid: 7|app: 0|req: 89/177] 199.19.213.150 () {42 vars in 705 bytes} [Wed Aug 5 22:16:24 2026] GET /v2.1 => generated 114 bytes in 1 msecs (HTTP/1.1 401) 6 headers in 319 bytes (1 switches on core 0) [pid: 8|app: 0|req: 89/178] 199.19.213.150 () {44 vars in 909 bytes} [Wed Aug 5 22:16:24 2026] GET /v2.1 => generated 0 bytes in 6 msecs (HTTP/1.1 302) 5 headers in 266 bytes (0 switches on core 0) [pid: 7|app: 0|req: 90/179] 199.19.213.150 () {46 vars in 982 bytes} [Wed Aug 5 22:16:24 2026] GET /v2.1/ => generated 400 bytes in 8 msecs (HTTP/1.1 200) 9 headers in 357 bytes (1 switches on core 0) [pid: 8|app: 0|req: 90/180] 199.19.213.150 () {48 vars in 1073 bytes} [Wed Aug 5 22:16:24 2026] GET /v2.1/os-quota-sets/f97dc100bdc242f1bc3a059240af86e9 => generated 283 bytes in 54 msecs (HTTP/1.1 200) 9 headers in 359 bytes (1 switches on core 0) [pid: 7|app: 0|req: 91/181] 199.19.213.150 () {52 vars in 1125 bytes} [Wed Aug 5 22:16:24 2026] PUT /v2.1/os-quota-sets/f97dc100bdc242f1bc3a059240af86e9 => generated 238 bytes in 644 msecs (HTTP/1.1 200) 9 headers in 359 bytes (1 switches on core 0)