ref: c3ca13a71a1d8928c7c7b931e0423ffe0544418a
dir: /sys/man/1/trace/
.TH TRACE 1 .SH NAME trace \- show (real-time) process behavior .SH SYNOPSIS .B trace [ .B -d .I file ] [ .B -v ] [ .B -w ] [ .I pid \&... ] .SH DESCRIPTION .I Trace displays the behavior of processes running on the machine. In its window it shows a time line for each traced process. Running processes appear as colored blocks, with arrows marking important events in real-time processes (see .IR proc (3)). Black up arrows mark process releases, black down arrows mark process deadlines, green down arrows mark times when a process yielded the processor before its deadline, red down arrows mark times when the process overran its allotted time. .PP .I Trace reads .B /proc/trace to retrieve trace events from the kernel scheduler. Trace events are binary data structures generated by the kernel scheduler. It is assumed that the reader of .B /proc/trace and the kernel providing it have the same byte order. .PP The options are: .TP .B -d specify an alternate trace event file .TP .B -v print events as they are read from the trace event file .TP .B -w run in a new window rather than using the current one .PD .PP .I Trace recognizes these keystroke commands while it is running: .TP .B + zoom in by a factor of two .TP .B - zoom out by a factor of two .TP .B p pause or resume .TP .B q quit .PD .PP .SH SEE ALSO .IR proc (3) .SH FILES .TF /sys/include/trace.h .TP .B /proc/trace trace event file .TP .B /sys/include/trace.h trace event data structures .PD .SH SOURCE .B /sys/src/cmd/trace.c