dtrace_tips

More documents

Recommendations

Info

Trick: Rates over time●●●For varying workloads, it can be usefulto observe changes in rates over timeThis can be done using printa andclear out of a tick probe, butoutput will be by time – not byaggregated tupleInstead, aggregate with lquantize ofcurrent time minus start time (fromBEGIN enabling) divided by unit time
Tip: Using system●●Use the system action to execute acommand in response to a probeTakes printf-like format string andarguments:●#pragma D option quiet#pragma D option destructiveio:::start/args[2]->fi_pathname != “” &&args[2]->fi_pathname != “”/{system(“file %s”, args[2]->fi_pathname);}
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: Trick: Tracking object lifetime●
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 and 36: Tip: Ring buffering and -c/-p●●
Page 37 and 38: Tip: Tuning the deadman●●If the
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

dtrace_tips

Create successful ePaper yourself

Delete template?

Save as template?