SysTutorials Posts

perl – The Perl 5 language interpreter Synopsis perl   [ -sTtuUWX ]         [ -hv ] [ -V[:configvar] ]         [ -cw ] [ -d[t][:debugger] ] [ -D[number/list] ]         [ -pna ] [ -Fpattern ] [ -l[octal] ] [ -0[octal/hexadecimal] ]         [ -Idir ] [ -m[–]module ] [ -M[–]‘module…’ ] [ -f ]         [ -C [number/list] ]         [ -S ]         [ -x[dir] ]         [ -i[extension] ]         [ [-e|-E] ‘command’ ] [ — ] [ programfile ] [ argument ]… For more information on these options, you can run "perldoc perlrun". Getting Help The perldoc program gives you access to all the documentation that comes with Perl. You can get more documentation, tutorials and community support online…

perl.req – list requirements for Perl scripts and libraries Synopsis perl.req [-h|–help] [-v|–verbose] [-m|–method=strict|normal|relaxed] [FILE…] Description perl.req calculates prerequisites for each Perl source file specified on a command line; alternatively, a list of files is obtained from standard input, one file per line. "use", "require" and "do" statements are processed. The output of perl.req is…

perl.prov – list what Perl source files provide Synopsis perl.prov [-v|–verbose] [FILE…] Description This script calculates conventional name for each Perl source file specified on a command line, based on its location relative to standard Perl library paths; alternatively, a list of files is obtained from standard input, one file per line. *.pm, *.pl, and…

NAME perl – The Perl 5 language interpreter SYNOPSIS perl   [ -sTtuUWX ]         [ -hv ] [ -V[:configvar] ]         [ -cw ] [ -d[t][:debugger] ] [ -D[number/list] ]         [ -pna ] [ -Fpattern ] [ -l[octal] ] [ -0[octal/hexadecimal] ]         [ -Idir ] [ -m[–]module ] [ -M[–]‘module…’ ] [ -f ]         [ -C [number/list] ]         [ -S ]         [ -x[dir] ]         [ -i[extension] ]         [ [-e|-E] ‘command’ ] [ — ] [ programfile ] [ argument ]… For more information on these options, you can run "perldoc perlrun". GETTING HELP The perldoc program gives you access to all the documentation that comes with Perl. You can get more documentation, tutorials and community support…

NAME perfalloc – notify pmdaperfevent(1) to disable hardware counter allocation. SYNOPSIS $PCP_PMDAS_DIR/perfevent/perfalloc [-D] [-d] [-f lockfile] [-h] [-v] [COMMAND] DESCRIPTION perfalloc is a command that notifies the pmdaperfevent(1) to disable hardware counter event collection. This allow unprivileged processes to use the hardware counters. If the reservation request fails, then perfalloc exits immediately with exit code…

NAME perf – Performance analysis tools for Linux SYNOPSIS perf[–version][–help][OPTIONS] COMMAND[ARGS] OPTIONS –debug Setup debug variable (just verbose for now) in value range (0, 10). Use like: –debug verbose # sets verbose = 1 –debug verbose=2 # sets verbose = 2 DESCRIPTION Performance counters for Linux are a new kernel-based subsystem that provide a framework…

NAME perf-trace – strace inspired tool SYNOPSIS perf trace perf trace record DESCRIPTION This command will show the events associated with the target, initially syscalls, but other system events like pagefaults, task lifetime events, scheduling events, etc. This is a live mode tool in addition to working with perf.data files like the other perf tools….

NAME perf-top – System profiling tool. SYNOPSIS perf top[-e<EVENT> | –event = EVENT][<options>] DESCRIPTION This command generates and displays a performance counter profile in real time. OPTIONS -a, –all-cpus System-wide collection. (default) -c <count>, –count=<count> Event period to sample. -C <cpu-list>, –cpu=<cpu> Monitor only on the list of CPUs provided. Multiple CPUs can be provided…

NAME perf-timechart – Tool to visualize total system behavior during a workload SYNOPSIS DESCRIPTION There are two variants of perf timechart: ‘perf timechart record <command>’ to record the system level events of an arbitrary workload. By default timechart records only scheduler and CPU events (task switches, running times, CPU power states, etc), but it’s possible…

NAME perf-test – Runs sanity tests. SYNOPSIS perf test[<options>][{list<test – name – fragment> | [<test – name – fragments> | <test – numbers>]}] DESCRIPTION This command does assorted sanity tests, initially through linked routines but also will look for a directory with more tests in the form of scripts. To get a list of available…

NAME perf-stat – Run a command and gather performance counter statistics SYNOPSIS perf stat[-e<EVENT> | –event = EVENT][-a]<command> perf stat[-e<EVENT> | –event = EVENT][-a]– – <command>[<options>] DESCRIPTION This command runs a command and gathers performance counter statistics from it. OPTIONS <command>… Any command you can specify in a shell. -e, –event= Select the PMU event….

NAME perf-script – Read perf.data (created by perf record) and display trace output SYNOPSIS perf script[<options>] perf script[<options>] record<script>[<record – options>]<command> perf script[<options>] report<script>[script – args] perf script[<options>]<script><required – script – args>[<record – options>]<command> perf script[<options>]<top – script>[script – args] DESCRIPTION This command reads the input file and displays the trace recorded. There are several…

NAME perf-script-python – Process trace data with a Python script SYNOPSIS perf script [-s[Python]:script[.py]] DESCRIPTION This perf script option is used to process perf script data using perf’s built-in Python interpreter. It reads and processes the input file and displays the results of the trace analysis implemented in the given Python script, if any. A…

NAME perf-script-perl – Process trace data with a Perl script SYNOPSIS perf script [-s[Perl]:script[.pl]] DESCRIPTION This perf script option is used to process perf script data using perf’s built-in Perl interpreter. It reads and processes the input file and displays the results of the trace analysis implemented in the given Perl script, if any. STARTER…

NAME perf-sched – Tool to trace/measure scheduler properties (latencies) SYNOPSIS perf sched {record|latency|map|replay|script} DESCRIPTION There are five variants of perf sched: ‘perf sched record <command>’ to record the scheduling events of an arbitrary workload. ‘perf sched latency’ to report the per task scheduling latencies and other scheduling properties of the workload. ‘perf sched script’ to…

NAME perf-report – Read perf.data (created by perf record) and display the profile SYNOPSIS perf report [-i <file> | –input=file] DESCRIPTION This command displays the performance counter profile information recorded via perf record. OPTIONS -i, –input= Input file name. (default: perf.data unless stdin is a fifo) -v, –verbose Be more verbose. (show symbol address, etc)…

NAME perf-record – Run a command and record its profile into perf.data SYNOPSIS perf record[-e<EVENT> | –event = EVENT][-l][-a]<command> perf record[-e<EVENT> | –event = EVENT][-l][-a]– – <command>[<options>] DESCRIPTION This command runs a command and gathers a performance counter profile from it, into perf.data – without displaying anything. This file can then be inspected later on,…

NAME perf-probe – Define new dynamic tracepoints SYNOPSIS perf probe[options]– add = PROBE[…] or perf probe[options] PROBE or perf probe[options]– del = [GROUP:] EVENT[…] or perf probe– list or perf probe[options]– line = LINE or perf probe[options]– vars = PROBEPOINT DESCRIPTION This command defines dynamic tracepoint events, by symbol and registers without debuginfo, or by…

NAME perf-mem – Profile memory accesses SYNOPSIS perf mem[<options>](record[<command>] | report) DESCRIPTION "perf mem -t <TYPE> record" runs a command and gathers memory operation data from it, into perf.data. Perf record options are accepted and are passed through. "perf mem -t <TYPE> report" displays the result. It invokes perf report with the right set of…

NAME perf-lock – Analyze lock events SYNOPSIS perf lock {record|report|script|info} DESCRIPTION You can analyze various lock behaviours and statistics with this perf lock command. ‘perf lock record <command>’ records lock events between start and end <command>. And this command produces the file "perf.data" which contains tracing results of lock events. ‘perf lock report’ reports statistical…