LinuxCon Europe Cloud Monitoring and Distribution Bug Reporting with Live Streaming and Snapshots.
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1 LinuxCon Europe 2013 Cloud Monitoring and Distribution Bug Reporting with Live Streaming and Snapshots 1
2 Presenter Mathieu Desnoyers Author/Maintainer of Userspace RCU, LTTng kernel and user-space tracers, Babeltrace. 2
3 Content New and upcoming features since Tracing Summit 2012 LTTng Babeltrace Cloud monitoring Enhanced bug reports LTTng project roadmap 3
4 LTTng Reminder LTTng 2.x does NOT require any kernel modification. 4
5 LTTng Reminder LTTng 2.x does NOT require any kernel modification. 5
6 LTTng Reminder LTTng 2.x does NOT require any kernel modification. 6
7 LTTng Reminder LTTng 2.x does NOT require any kernel modification. 7
8 LTTng Features Since Tracing Summit 2012 LTTng 2.1 Basse Messe (December 2012) Network Streaming (TCP) Session daemon health check Event field filtering (LTTng-UST) ARM, MIPS sysem call tracing (LTTng modules) 8
9 LTTng Features Since Tracing Summit 2012 LTTng 2.2 Cuda (June 2013) Per user ID buffers (LTTng-UST) On disk file rotation (maximum stream file size) 9
10 LTTng Features Since Tracing Summit 2012 LTTng 2.3 Dominus Vobiscum (September 2013) Flight recorder tracing Stop and non-stop snapshots Core dump handler integration LTTng Tools extras/ 10
11 Flight recorder session + snapshot $ lttng create --snapshot $ lttng enable-event -k sched_switch $ lttng enable-event -k -syscall -a $ lttng start $... $ lttng snapshot record Snapshot recorded successfully for session auto $ babeltrace /home/julien/lttng-traces/auto /snapshot /kernel/ 11
12 Snapshot At any point in time, a snapshot can be taken of a the current trace buffers. Overwrite mode meaning flight recorder ring buffer trace data lttng_snapshot_record(..) $ lttng snapshot record snapshot trace data 12
13 LTTng Features Since Tracing Summit 2012 LTTng 2.4 Époque Opaque (upcoming) Java Util Logging (JUL) tracing Live streaming Analysis of live traces Consumer and relay daemon health check Packet index generated by consumer daemon Faster load of large traces in viewers afterward 13
14 Live Network Streaming Deployment Server A (lttng-sessiond) Server B (lttng-sessiond) Server C (lttng-sessiond) TCP lttng-relayd TCP Viewer 14
15 Live Network Streaming Session On the server to trace : $ lttng create - live U net:// $ lttng enable-event -k sched_switch $ lttng enable-event -k -syscall -a $ lttng start On the receiving server ( ) : $ lttng-relayd -d On the viewer machine : $ lttngtop -r
16 Live Trace Streaming Usage As the trace is being created, you extract and can analyze the data. Continous Analysis Extract data with live streaming for analysis on an other machine Cluster-level analysis Gather traces from multiple machines Load balancing analysis Latency detection System Administration Get data of faulty machine on-demand 16
17 Performance Results 17
18 Babeltrace Features Since Tracing Summit 2012 Babeltrace 1.0 (initial release, October 2012) Babeltrace 1.1 (API namespacing fix, March 2013) Babeltrace 1.2 (upcoming) Common Trace Format (CTF) Writer API Python bindings Nexus to CTF converter Live trace stream read support Connect to LTTng relay daemon 18
19 Cloud Monitoring Live network streaming Flight recorder tracing and snapshots Bytecode interpreter On traced target or separate dedicated machine, Triggers: Start tracing Stop tracing Gather snapshot Aggregation 19
20 Enhanced Bug Reports Flight recorder tracing In production Extremely low overhead When error is encountered Gather snapshot Do you want to send a detailed bug report? Very detailed trace of trace leading to the problem sent along with bug report 20
21 LTTng Project Roadmap Save/restore trace session configuration to/from files Support Perf PMU counters from LTTng-UST Dynamic instrumentation of user-space (dyninst) Listing libraries shared objects (LD_PRELOAD) Hardware tracing (ARM, Freescale, Intel,...) Triggers and aggregation in LTTng-UST bytecode interpreter LTTng modules bytecode interpreter Android port for LTTng modules and UST 21
22 Questions?? 22
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