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DTrace: Programming • Programming capabilities Linux Performance Analysis and Tools

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DTrace: Programming • Programming capabilities allow for powerful, efficient, one- liners and scripts. In-kernel custom filtering and aggregation. # dtrace -n fbt::tcp_sendmsg:entry /execname == "sshd"/ { @["bytes"] = quantize(arg3); } filter dtrace: description fbt::tcp_sendmsg:entry matched 1 probe ^C aggregation (summarizes) bytes value ------------- Distribution ------------- count 16 | 0 32 |@@@@@@@@@@@@@@@@ 1869 64 |@@@@@@@@@@@@@ 1490 128 |@@@ 355 256 |@@@@ 461 512 |@@@ kernel -> user transfers 373 1024 |@ 95 2048 | these these numbers 4 4096 | 1 8192 | only (pre-summarized) 0 • Example shows tcp_sendmsg() size dist for “sshd” PIDs these examples use dtrace4linuxSunday, February 24, 13

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