Name | 06910374_08_2 |
Workunit | 184862 |
Created | 14 Nov 2018, 21:17:51 UTC |
Sent | 14 Nov 2018, 21:18:16 UTC |
Report deadline | 15 Nov 2018, 5:18:16 UTC |
Received | 15 Nov 2018, 9:19:06 UTC |
Server state | Over |
Outcome | Success |
Client state | Done |
Exit status | 0 (0x00000000) |
Computer ID | 501 |
Run time | 6 hours 34 min 33 sec |
CPU time | 3 hours 11 min 54 sec |
Validate state | Valid |
Credit | 49.63 |
Device peak FLOPS | 4.13 GFLOPS |
Application version | boinc2docker v1.11 (vbox64_mt) x86_64-pc-linux-gnu |
Peak working set size | 111.46 MB |
Peak swap size | 3.82 GB |
Peak disk usage | 231.71 MB |
<core_client_version>7.10.2</core_client_version> <![CDATA[ <stderr_txt> 2018-11-15 03:44:20 (31163): vboxwrapper (7.7.26197): starting 2018-11-15 03:44:21 (31163): Feature: Checkpoint interval offset (400 seconds) 2018-11-15 03:44:21 (31163): Detected: VirtualBox VboxManage Interface (Version: 5.2.22) 2018-11-15 03:44:21 (31163): Detected: Minimum checkpoint interval (600.000000 seconds) 2018-11-15 03:44:22 (31163): Create VM. (boinc_7203838349834514, slot#1) 2018-11-15 03:44:22 (31163): Updating drive controller type and model for desired configuration. 2018-11-15 03:44:23 (31163): Setting Memory Size for VM. (3072MB) 2018-11-15 03:44:24 (31163): Setting CPU Count for VM. (1) 2018-11-15 03:44:24 (31163): Setting Chipset Options for VM. 2018-11-15 03:44:24 (31163): Setting Boot Options for VM. 2018-11-15 03:44:25 (31163): Setting Network Configuration for NAT. 2018-11-15 03:44:26 (31163): Enabling VM Network Access. 2018-11-15 03:44:26 (31163): Disabling USB Support for VM. 2018-11-15 03:44:26 (31163): Disabling COM Port Support for VM. 2018-11-15 03:44:27 (31163): Disabling LPT Port Support for VM. 2018-11-15 03:44:28 (31163): Disabling Audio Support for VM. 2018-11-15 03:44:28 (31163): Disabling Clipboard Support for VM. 2018-11-15 03:44:29 (31163): Disabling Drag and Drop Support for VM. 2018-11-15 03:44:29 (31163): Adding storage controller(s) to VM. 2018-11-15 03:44:30 (31163): Adding virtual ISO 9660 disk drive to VM. (vm_isocontext.iso) 2018-11-15 03:44:31 (31163): Adding VirtualBox Guest Additions to VM. 2018-11-15 03:44:31 (31163): Adding network bandwidth throttle group to VM. (Defaulting to 1024GB) 2018-11-15 03:44:32 (31163): Enabling shared directory for VM. 2018-11-15 03:44:34 (31163): Starting VM. (boinc_7203838349834514, slot#1) 2018-11-15 03:44:38 (31163): Successfully started VM. (PID = '32198') 2018-11-15 03:44:38 (31163): Reporting VM Process ID to BOINC. 2018-11-15 03:44:41 (31163): Guest Log: BIOS: VirtualBox 5.2.22 2018-11-15 03:44:41 (31163): Guest Log: CPUID EDX: 0x078bfbff 2018-11-15 03:44:41 (31163): Guest Log: BIOS: Boot : bseqnr=1, bootseq=0032 2018-11-15 03:44:41 (31163): Guest Log: int13_harddisk: function 02, unmapped device for ELDL=80 2018-11-15 03:44:41 (31163): Guest Log: BIOS: Boot from Hard Disk 0 failed 2018-11-15 03:44:41 (31163): Guest Log: BIOS: Boot : bseqnr=2, bootseq=0003 2018-11-15 03:44:41 (31163): Guest Log: BIOS: Booting from CD-ROM... 2018-11-15 03:44:43 (31163): VM state change detected. (old = 'poweroff', new = 'running') 2018-11-15 03:44:45 (31163): Preference change detected 2018-11-15 03:44:45 (31163): Setting CPU throttle for VM. (100%) 2018-11-15 03:44:45 (31163): Setting checkpoint interval to 600 seconds. (Higher value of (Preference: 60 seconds) or (Vbox_job.xml: 600 seconds)) 2018-11-15 03:44:51 (31163): Guest Log: BIOS: KBD: unsupported int 16h function 03 2018-11-15 03:44:51 (31163): Guest Log: BIOS: AX=0305 BX=0000 CX=0000 DX=0000 2018-11-15 03:45:15 (31163): Guest Log: vgdrvHeartbeatInit: Setting up heartbeat to trigger every 2000 milliseconds 2018-11-15 03:45:15 (31163): Guest Log: vboxguest: misc device minor 56, IRQ 20, I/O port d020, MMIO at 00000000f0400000 (size 0x400000) 2018-11-15 03:45:15 (31163): Guest Log: net.ipv4.ip_forward = 1 2018-11-15 03:45:15 (31163): Guest Log: sysctl: cannot stat /proc/sys/net/ipv6/conf/all/forwarding: No such file or directory 2018-11-15 03:45:15 (31163): Guest Log: sysctl: setting key "cannot stat %s": No such file or directory 2018-11-15 03:45:15 (31163): Guest Log: sysctl: "cannot stat %s" is an unknown key 2018-11-15 03:45:15 (31163): Guest Log: sysctl: setting key "cannot stat %s": No such file or directory 2018-11-15 03:45:15 (31163): Guest Log: Segmentation fault 2018-11-15 03:45:15 (31163): Guest Log: automount ... 2018-11-15 03:45:15 (31163): Guest Log: Is the disk unpartitioned?, test for the 'boot2docker format-me' string 2018-11-15 03:45:15 (31163): Guest Log: automount over. 2018-11-15 03:45:15 (31163): Guest Log: [1;32mSetting hostname to [1;35mboot2docker[0;39m [1;32mDone.[0;39m 2018-11-15 03:45:15 (31163): Guest Log: Thu Nov 15 03:45:13 UTC 2018 dhcp ------------------------------- 2018-11-15 03:45:22 (31163): Guest Log: udevadm settle - timeout of 5 seconds reached, the event queue contains: 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:00/PNP0700:00 (1079) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00 (1304) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXCPU:00 (1305) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXPWRBN:00 (1306) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXPWRBN:00/input/input0 (1307) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXPWRBN:00/input/input0/event0 (1308) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSLPBN:00 (1309) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSLPBN:00/input/input1 (1310) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSLPBN:00/input/input1/event1 (1311) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00 (1312) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00 (1313) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/ACPI0003:00 (1314) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/ACPI0003:00/power_supply/AC (1315) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/LNXVIDEO:00 (1316) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/LNXVIDEO:00/device:01 (1317) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/LNXVIDEO:00/input/input6 (1318) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/LNXVIDEO:00/input/input6/event5 (1319) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/PNP0400:00 (1320) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/PNP0400:01 (1321) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/PNP0501:00 (1322) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/PNP0501:01 (1323) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/PNP0501:02 (1324) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/PNP0501:03 (1325) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/PNP0C02:00 (1326) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/PNP0C0A:00 (1327) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/PNP8390:00 (1328) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:00 (1329) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:00/APP0001:00 (1330) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:00/PNP0000:00 (1331) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:00/PNP0100:00 (1332) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:00/PNP0103:00 (1333) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:00/PNP0200:00 (1334) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:00/PNP0303:00 (1335) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:00/PNP0700:00 (1336) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:00/PNP0B00:00 (1337) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:00/PNP0F03:00 (1338) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:02 (1339) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0F:00 (1340) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0F:01 (1341) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0F:02 (1342) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0F:03 (1343) 2018-11-15 03:45:22 (31163): Guest Log: /sys/devices/LNXSYSTM:00/LNXSYBUS:01 (1344) 2018-11-15 03:45:22 (31163): Guest Log: Thu Nov 15 03:45:19 UTC 2018 dhcp ------------------------------- 2018-11-15 03:45:22 (31163): Guest Log: VBoxService 5.0.16 r105871 (verbosity: 0) linux.amd64 (Mar 4 2016 17:38:55) release log 2018-11-15 03:45:22 (31163): Guest Log: 00:00:00.000115 main Log opened 2018-11-15T03:45:19.528384000Z 2018-11-15 03:45:22 (31163): Guest Log: VBoxService 5.0.16 r105871 (verbosity: 0) linux.amd64 (Mar 4 2016 17:38:55) release log 2018-11-15 03:45:22 (31163): Guest Log: 00:00:00.000115 main Log opened 2018-11-15T03:45:19.528384000Z 2018-11-15 03:45:22 (31163): Guest Log: 00:00:00.002971 main OS Product: Linux 2018-11-15 03:45:22 (31163): Guest Log: 00:00:00.002971 main00:00:00.011315 main OS Release: 4.1.19-boot2docker 2018-11-15 03:45:22 (31163): Guest Log: 00:00:00.011416 main OS Version: #1 SMP Sun Apr 17 19:40:54 UTC 2016 2018-11-15 03:45:22 (31163): Guest Log: 00:00:00.011450 main Executable: /sbin/VBoxService 2018-11-15 03:45:22 (31163): Guest Log: 00:00:00.011451 main Process ID: 815 2018-11-15 03:45:22 (31163): Guest Log: 00:00:00.011452 main Package type: LINUX_64BITS_GENERIC 2018-11-15 03:45:22 (31163): Guest Log: OS Product: Linux 2018-11-15 03:45:22 (31163): Guest Log: 00:00:00.011315 main OS Release: 4.1.19-boot2docker 2018-11-15 03:45:22 (31163): Guest Log: 00:00:00.011416 main OS Version: #1 SMP Sun Apr 17 19:40:54 UTC 2016 2018-11-15 03:45:22 (31163): Guest Log: 00:00:00.011450 main Executable: /sbin/VBoxService 2018-11-15 03:45:22 (31163): Guest Log: 00:00:00.011451 main Process ID: 815 2018-11-15 03:45:22 (31163): Guest Log: 00:00:00.011452 main Package type: LINUX_64BITS_GENERIC 2018-11-15 03:45:22 (31163): Guest Log: 00:00:00.077338 main 5.0.16 r105871 started. Verbose level = 0 2018-11-15 03:45:22 (31163): Guest Log: 00:00:00.077338 main 5.0.16 r105871 started. Verbose level = 0 2018-11-15 03:45:22 (31163): Guest Log: 00:00:00.128483 vminfo rtldrNativeLoad: dlopen('libdbus-1.so.3', RTLD_NOW | RTLD_LOCAL) failed: libdbus-1.so.3: cannot open shared object file: No such file or directory 2018-11-15 03:45:22 (31163): Guest Log: 00:00:00.128565 vminfo Error: Unable to connect to system D-Bus (1/3): D-Bus not installed 2018-11-15 03:45:22 (31163): Guest Log: Mounting BOINC shared/... 2018-11-15 03:45:22 (31163): Guest Log: ------------------- 2018-11-15 03:45:22 (31163): Guest Log: Thu Nov 15 02:45:21 UTC 2018 2018-11-15 03:45:27 (31163): Guest Log: 00:00:05.146493 vminfo Error: Unable to connect to system D-Bus (2/3): D-Bus not installed 2018-11-15 03:45:27 (31163): Guest Log: Thu Nov 15 02:45:26 UTC 2018 2018-11-15 03:45:27 (31163): Guest Log: 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default 2018-11-15 03:45:27 (31163): Guest Log: link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 2018-11-15 03:45:27 (31163): Guest Log: inet 127.0.0.1/8 scope host lo 2018-11-15 03:45:27 (31163): Guest Log: valid_lft forever preferred_lft forever 2018-11-15 03:45:27 (31163): Guest Log: inet6 ::1/128 scope host 2018-11-15 03:45:27 (31163): Guest Log: valid_lft forever preferred_lft forever 2018-11-15 03:45:27 (31163): Guest Log: 2: dummy0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN group default 2018-11-15 03:45:27 (31163): Guest Log: link/ether 2a:b2:07:38:0d:fc brd ff:ff:ff:ff:ff:ff 2018-11-15 03:45:27 (31163): Guest Log: 3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 2018-11-15 03:45:27 (31163): Guest Log: link/ether 08:00:27:93:8a:1f brd ff:ff:ff:ff:ff:ff 2018-11-15 03:45:27 (31163): Guest Log: inet 10.0.2.15/24 brd 10.0.2.255 scope global eth0 2018-11-15 03:45:27 (31163): Guest Log: valid_lft forever preferred_lft forever 2018-11-15 03:45:27 (31163): Guest Log: inet6 fe80::a00:27ff:fe93:8a1f/64 scope link 2018-11-15 03:45:27 (31163): Guest Log: valid_lft forever preferred_lft forever 2018-11-15 03:45:27 (31163): Guest Log: ------------------- 2018-11-15 03:45:27 (31163): Guest Log: Linking /etc/docker to /var/lib/boot2docker for persistence 2018-11-15 03:45:27 (31163): Guest Log: Waiting for Docker daemon to start... 2018-11-15 03:45:29 (31163): Guest Log: REPOSITORY TAG IMAGE ID CREATED SIZE 2018-11-15 03:45:29 (31163): Guest Log: Running boinc_app... 2018-11-15 03:45:29 (31163): Guest Log: Importing Docker image from BOINC... 2018-11-15 03:45:29 (31163): Guest Log: Filesystem Size Used Available Use% Mounted on 2018-11-15 03:45:29 (31163): Guest Log: tmpfs 2.6G 164.2M 2.5G 6% / 2018-11-15 03:45:29 (31163): Guest Log: tmpfs 1.5G 0 1.5G 0% /dev/shm 2018-11-15 03:45:29 (31163): Guest Log: cgroup 1.5G 0 1.5G 0% /sys/fs/cgroup 2018-11-15 03:45:29 (31163): Guest Log: shared 437.2G 35.6G 401.7G 8% /root/shared 2018-11-15 03:45:29 (31163): Guest Log: tmpfs 2.6G 164.2M 2.5G 6% /var/lib/docker/aufs 2018-11-15 03:45:32 (31163): Guest Log: 00:00:10.149513 vminfo Error: Unable to connect to system D-Bus (3/3): D-Bus not installed 2018-11-15 03:45:46 (31163): Guest Log: doing docker load... 2018-11-15 03:46:11 (31163): Guest Log: Filesystem Size Used Available Use% Mounted on 2018-11-15 03:46:11 (31163): Guest Log: tmpfs 2.6G 631.9M 2.0G 23% / 2018-11-15 03:46:11 (31163): Guest Log: tmpfs 1.5G 0 1.5G 0% /dev/shm 2018-11-15 03:46:11 (31163): Guest Log: cgroup 1.5G 0 1.5G 0% /sys/fs/cgroup 2018-11-15 03:46:11 (31163): Guest Log: shared 437.2G 35.4G 401.8G 8% /root/shared 2018-11-15 03:46:11 (31163): Guest Log: tmpfs 2.6G 631.9M 2.0G 23% /var/lib/docker/aufs 2018-11-15 03:46:11 (31163): Guest Log: total used free shared buff/cache available 2018-11-15 03:46:11 (31163): Guest Log: Mem: 3007 51 2287 631 669 2287 2018-11-15 03:46:11 (31163): Guest Log: Swap: 701 0 701 2018-11-15 03:46:11 (31163): Guest Log: Building apps directory... 2018-11-15 03:46:27 (31163): Guest Log: Prerun diagnostics... 2018-11-15 03:46:27 (31163): Guest Log: REPOSITORY TAG IMAGE ID CREATED SIZE 2018-11-15 03:46:27 (31163): Guest Log: nanohub_apps_base 11 42db2bf7db3d 11 months ago 458.1 MB 2018-11-15 03:46:27 (31163): Guest Log: CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 2018-11-15 03:46:27 (31163): Guest Log: 467.8M /var/lib/docker 2018-11-15 03:46:27 (31163): Guest Log: total used free shared buff/cache available 2018-11-15 03:46:27 (31163): Guest Log: Mem: 3007 53 2283 631 670 2284 2018-11-15 03:46:27 (31163): Guest Log: Swap: 701 0 701 2018-11-15 03:46:27 (31163): Guest Log: Filesystem Size Used Available Use% Mounted on 2018-11-15 03:46:27 (31163): Guest Log: tmpfs 2.6G 631.9M 2.0G 23% / 2018-11-15 03:46:27 (31163): Guest Log: tmpfs 1.5G 0 1.5G 0% /dev/shm 2018-11-15 03:46:27 (31163): Guest Log: cgroup 1.5G 0 1.5G 0% /sys/fs/cgroup 2018-11-15 03:46:27 (31163): Guest Log: shared 437.2G 35.5G 401.7G 8% /root/shared 2018-11-15 03:46:27 (31163): Guest Log: tmpfs 2.6G 631.9M 2.0G 23% /var/lib/docker/aufs 2018-11-15 03:46:27 (31163): Guest Log: Running... 2018-11-15 03:46:27 (31163): Guest Log: 06910374_08.boinc 2018-11-15 03:46:27 (31163): Guest Log: 06910374_08.sh 2018-11-15 05:24:48 (31163): Status Report: Elapsed Time: '6001.900114' 2018-11-15 05:24:48 (31163): Status Report: CPU Time: '2903.100000' 2018-11-15 07:04:48 (31163): Status Report: Elapsed Time: '12002.884569' 2018-11-15 07:04:48 (31163): Status Report: CPU Time: '5833.880000' 2018-11-15 08:44:50 (31163): Status Report: Elapsed Time: '18004.652549' 2018-11-15 08:44:50 (31163): Status Report: CPU Time: '8753.800000' 2018-11-15 10:18:41 (31163): Guest Log: boinc_app exited (0) 2018-11-15 10:18:41 (31163): Guest Log: Saving results... 2018-11-15 10:18:41 (31163): Guest Log: 06910374_08_output.tar.gz 2018-11-15 10:18:41 (31163): VM Completion File Detected. 2018-11-15 10:18:41 (31163): Powering off VM. 2018-11-15 10:18:44 (31163): Successfully stopped VM. 2018-11-15 10:18:44 (31163): Deregistering VM. (boinc_7203838349834514, slot#1) 2018-11-15 10:18:45 (31163): Removing network bandwidth throttle group from VM. 2018-11-15 10:18:45 (31163): Removing storage controller(s) from VM. 2018-11-15 10:18:45 (31163): Removing VM from VirtualBox. 2018-11-15 10:18:46 (31163): Removing virtual ISO 9660 disk from VirtualBox. 10:18:52 (31163): called boinc_finish(0) </stderr_txt> ]]>
©2025 COPYRIGHT 2017-2018 NCN