PERF(1) General Commands Manual PERF(1)NAME
perf - performance analysis tools for Linux
SYNOPSIS
perf [--version] [--help] COMMAND [ARGS]
DESCRIPTION
Performance counters for Linux are are a new kernel-based subsystem that provide a framework for all things performance analysis. It cov-
ers hardware level (CPU/PMU, Performance Monitoring Unit) features and software features (software counters, tracepoints) as well.
Each version of the perf tools may depend on new kernel features, so you must install a different version for each kernel version. The
perf command will automatically run the correct version for the running kernel version.
SEE ALSO perf_version(1)
4 July 2010 PERF(1)
Check Out this Related Man Page
PERF-TRACE(1) perf Manual PERF-TRACE(1)NAME
perf-trace - strace inspired tool
SYNOPSIS
perf trace
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.
Initially this is a live mode only tool, but eventually will work with perf.data files like the other tools, allowing a detached record
from analysis phases.
OPTIONS -a, --all-cpus
System-wide collection from all CPUs.
-e, --expr
List of events to show, currently only syscall names. Prefixing with ! shows all syscalls but the ones specified. You may need to
escape it.
-o, --output=
Output file name.
-p, --pid=
Record events on existing process ID (comma separated list).
-t, --tid=
Record events on existing thread ID (comma separated list).
-u, --uid=
Record events in threads owned by uid. Name or number.
-v, --verbose=
Verbosity level.
-i, --no-inherit
Child tasks do not inherit counters.
-m, --mmap-pages=
Number of mmap data pages. Must be a power of two.
-C, --cpu
Collect samples only on the list of CPUs provided. Multiple CPUs can be provided as a comma-separated list with no space: 0,1. Ranges
of CPUs are specified with -: 0-2. In per-thread mode with inheritance mode on (default), Events are captured only when the thread
executes on the designated CPUs. Default is to monitor all CPUs.
--duration: Show only events that had a duration greater than N.M ms.
--sched: Accrue thread runtime and provide a summary at the end of the session.
-i --input Process events from a given perf data file.
SEE ALSO perf-record(1), perf-script(1)perf 06/30/2014 PERF-TRACE(1)
Hello,
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Matez,
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Hello Gurus,
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Hi,
I have a script below for extracting xml from a file.
for i in *.txt
do
echo $i
awk '/<.*/ , /.*<\/.*>/' "$i" | tr -d '\n'
echo -ne '\n'
done
.
I read about using multi threading to speed up the script.
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Here is a chance for Linux users to easily compare Linux CPU info and some meaningless BOGOMIPS. Everyone who is running Linux is welcome to:
cat /proc/cpuinfo
and post the results.
Here is the results for www.unix.com:
processor : 0
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Hi ,
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Step1:we will receive multiple files weekly with same name(as below) in a folder(In folder we will have other files also def.dat,ghf.dat)
Filenames:
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