Display Tasks
Purpose
You can display information about tasks to further your investigation of a memory problem on the router.
Action
To display a list of tasks that are enabled on the router, enter the following Junos OS CLI operational mode commands:
Sample Output
user@R1> show task Pri Task Name Pro Port So Flags 10 LMP Client 17 <> 10 IF 15 INET6 15 INET 15 ISO 15 Memory 20 RPD Unix Domain Server./var/run/rpd_serv.local 21 <> 20 RPD Unix Domain Server./var/run/rpd_serv.local 20 <> 20 RPD Unix Domain Server./var/run/rpd_serv.local 19 <> 20 RPD Unix Domain Server./var/run/rpd_server_communication 16 <Accept> 20 RPD Server.0.0.0.0+666 666 15 <Accept> 20 Aggregate 20 RT 30 ICMP 1 30 Router-Advertisement 30 ICMPv6 58 9 <> 39 OSPFv2 I/O./var/run/ppmd_control 12 <> 40 l2vpn global task 40 BGP RT Background <LowPrio> 40 BGP.::+179 179 23 <Accept LowPrio> 40 BGP.0.0.0.0+179 179 22 <Accept LowPrio> 40 BFD I/O./var/run/bfdd_control 11 <> 40 OSPF 89 50 BGP_65001.10.0.0.5+3531 3531 18 <LowPrio> 50 BGP_65002.10.1.12.2+1224 1224 25 <LowPrio> 50 BGP_Group_internal <LowPrio> 50 BGP_Group_toR2 <LowPrio> 50 TED 50 ASPaths 51 Resolve inet.0 <LowPrio> 60 KStat 13 <> 60 KRT Request 7 <> 60 KRT Ifstate 255 6 <> 60 KRT 255 5 <> 60 Redirect 70 MGMT.local 24 <> 70 MGMT_Listen./var/run/rpd_mgmt 14 <Accept> 70 SNMP Subagent./var/run/snmpd_stream 10 <> 80 IF Delete user@R1> show task memory Memory Size (kB) Percentage When Currently In Use: 3490 1% now Maximum Ever Used: 3535 1% 04/02/04 11:54:46 Available: 220623 100% now user@R1> show task io Task Name Reads Writes Rcvd Sent Dropped LMP Client 1 1 0 0 0 IF 0 0 0 0 0 INET6 0 0 0 0 0 INET 0 0 0 0 0 ISO 0 0 0 0 0 Memory 0 0 0 0 0 RPD Unix Domain Server./var/ru 1 0 0 0 0 RPD Unix Domain Server./var/ru 1 0 0 0 0 RPD Unix Domain Server./var/ru 0 0 0 0 0 RPD Unix Domain Server./var/ru 3 0 0 0 0 RPD Server.0.0.0.0+666 0 0 0 0 0 Aggregate 0 0 0 0 0 RT 0 0 0 0 0 ICMP 0 0 0 0 0 Router-Advertisement 0 0 0 0 0 ICMPv6 0 0 0 0 0 OSPFv2 I/O./var/run/ppmd_contr 31167 1 0 0 0 l2vpn global task 0 0 0 0 0 BGP RT Background 0 0 0 0 0 BGP.::+179 0 0 0 0 0 BGP.0.0.0.0+179 8 0 0 0 0 BFD I/O./var/run/bfdd_control 30731 1 0 0 0 OSPF 0 0 0 0 0 BGP_65001.10.0.0.5+3531 20486 0 0 0 0 BGP_65002.10.1.12.2+1224 20489 6 0 0 0 BGP_Group_internal 0 0 0 0 0 BGP_Group_toR2 0 0 0 0 0 TED 0 0 0 0 0 ASPaths 0 0 0 0 0 Resolve inet.0 0 0 0 0 0 KStat 0 0 0 0 0 KRT Request 0 0 57 0 0 KRT Ifstate 18 0 16 0 0 KRT 0 0 2 0 0 Redirect 0 0 0 0 0 MGMT.local 0 0 0 0 0 MGMT_Listen./var/run/rpd_mgmt 23 0 0 0 0 SNMP Subagent./var/run/snmpd_s 23 0 0 0 0 IF Delete 0 0 0 0 0
Meaning
The sample output shows a list of routing, routing protocol, and interface tasks that are currently running on the router (show task), a summary of memory utilization (show task memory), and the memory utilization of a particular task (show task io). Tasks can be baseline tasks performed regardless of the router configuration, and other tasks that depend on the router configuration. For example, the BGP_Group_internal task is the result of the configuration of BGP on the router, while the INET6 task is a base task associated with the routing process (rpd).
Each task in the show task command output has a priority and a task name. For example, the current priority is 10 for LMP Client and 80 for IF Delete. A lower number indicates a higher priority.
Some tasks have flags attached to them. For example, the BGP.0.0.0.0+179 task has two flags, Accept and LowPrio. The Accept flag indicates that the task is waiting for incoming connections, and the LowPrio flag indicates that the task will be dispatched to read its socket after other, higher priority tasks. Two additional flags are Connect, which indicates that a task is waiting for a connection to complete, and Delete, which indicates that a task has been deleted and is being cleaned up.
The show task io command shows the statistics gathered for each IO operation. The counters show the following:
- Reads—This counter increments when a datagram arrives on a connected socket of the task and the task’s read callback is called.
- Writes—This counter increments when a connected socket of a task becomes writable and the tasks’s callback is called.
- Rcvd—This counter increments when the task calls the Routing Engine to read a datagram from a socket which may or may not be connected.
- Sent—This counter increments when a task attempts to read or write a datagram on an existing or nonexisting socket.
- Drops—This counter increments when a task attempts to read or write a datagram through the Routing Engine on a prebuilt socket, but the request fails for any reason.
