1 perf-sched(1) 2 ============== 3 4 NAME 5 ---- 6 perf-sched - Tool to trace/measure scheduler properties (latencies) 7 8 SYNOPSIS 9 -------- 10 [verse] 11 'perf sched' {record|latency|map|replay|script} 12 13 DESCRIPTION 14 ----------- 15 There are five variants of perf sched: 16 17 'perf sched record <command>' to record the scheduling events 18 of an arbitrary workload. 19 20 'perf sched latency' to report the per task scheduling latencies 21 and other scheduling properties of the workload. 22 23 'perf sched script' to see a detailed trace of the workload that 24 was recorded (aliased to 'perf script' for now). 25 26 'perf sched replay' to simulate the workload that was recorded 27 via perf sched record. (this is done by starting up mockup threads 28 that mimic the workload based on the events in the trace. These 29 threads can then replay the timings (CPU runtime and sleep patterns) 30 of the workload as it occurred when it was recorded - and can repeat 31 it a number of times, measuring its performance.) 32 33 'perf sched map' to print a textual context-switching outline of 34 workload captured via perf sched record. Columns stand for 35 individual CPUs, and the two-letter shortcuts stand for tasks that 36 are running on a CPU. A '*' denotes the CPU that had the event, and 37 a dot signals an idle CPU. 38 39 OPTIONS 40 ------- 41 -i:: 42 --input=<file>:: 43 Input file name. (default: perf.data unless stdin is a fifo) 44 45 -v:: 46 --verbose:: 47 Be more verbose. (show symbol address, etc) 48 49 -D:: 50 --dump-raw-trace=:: 51 Display verbose dump of the sched data. 52 53 SEE ALSO 54 -------- 55 linkperf:perf-record[1] 56
