dtrace_tips

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Gotcha: Deadman●●●DTrace protects against inducing toomuch load with a deadman that abortsenablings if the system becomesunresponsive:dtrace: processing aborted: Abort due to systemicunresponsivenessCriteria for responsiveness:– Interrupt can fire once a second– Consumer can run once every thirty secondsOn a heavily loaded system, a deadmantimeout may not be due to DTrace!
Tip: Tuning the deadman●●If the deadman is due to residual load,the deadman may simply be disabledby enabling destructive actionsAlternatively, the parameters for thedeadman can be explicitly tuned:– dtrace_deadman_user is user-levelreponsiveness expectation (in nanoseconds)– dtrace_deadman_interval is interruptresponsiveness expectation (in nanoseconds)– dtrace_deadman_timeout is the permittedlength of unresponsiveness (in nanoseconds)
Page 1 and 2: Advanced DTraceTips, Tricks and Got
Page 3 and 4: DTrace Tips●●●Tips are pointe
Page 5 and 6: DTrace Gotchas●●●Like any sys
Page 7 and 8: Tip: Speculative tracing●●●
Page 9 and 10: Tip: clear and tick probes●●cle
Page 11 and 12: Tip: stop●●One may wish to stop
Page 13 and 14: Gotcha: stop gone haywire●●●B
Page 17 and 18: Gotcha: Too many pid probes●●
Page 20 and 21: Gotcha: Buffer drops●●●●The
Page 25 and 26: Trick: Tracking object lifetime●
Page 27 and 28: Tip: Using system●●Use the syst
Page 29 and 30: Trick: system(“dtrace”)●●
Page 31 and 32: Gotcha: Stripped user stacks●●
Page 33 and 34: Trick: Using stop and ustack●●
Page 35: Tip: Ring buffering and -c/-p●●
Page 39 and 40: Trick: Watchpoints via pid●●●
Page 41 and 42: Trick: Iterating over structures●
Page 43 and 44: Gotcha: Unsporting functions●●
Page 45 and 46: Trick: sizeof and profiling●●
Page 47 and 48: Gotcha: $target evaluation●●●
Page 49 and 50: Gotcha: Data model mismatch●●
Page 51 and 52: Tip: Sample with profile●●●Wh
Page 53 and 54: Gotcha: vtimestamp●●●●vtime
Page 55 and 56: Tip: Demo DTrace scripts●●●/u

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