01-15-2004
The unix.com logo - anyone else seeing this?
Hi All
I'm not sure if anyone else notices this or not - however when I view the unix.com forums in Windows, the flash logo at the top of the page absolutely kills my performance - CPU usage rockets to 100%! If you open the task manager and monitor performance, and slowly scroll down so that the logo is no longer visible, CPU usage goes back down to 2-10%. If you scroll back up to view the logo, back it goes to 100%.
Before anyone says 'serves you right for using Windows' this also happens on my Mandrake Linux box (9.1) when using Konqueror - when unix.com forums are in the browser, user CPU usage goes up to a consistent 95%, navigate away from unix.com to another site, and it falls back down to 5%.
Anyone else seeing this?
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LEARN ABOUT LINUX
taskset
TASKSET(1) Linux User's Manual TASKSET(1)
NAME
taskset - retrieve or set a process's CPU affinity
SYNOPSIS
taskset [options] mask command [arg]...
taskset [options] -p [mask] pid
DESCRIPTION
taskset is used to set or retrieve the CPU affinity of a running process given its PID or to launch a new COMMAND with a given CPU affin-
ity. CPU affinity is a scheduler property that "bonds" a process to a given set of CPUs on the system. The Linux scheduler will honor the
given CPU affinity and the process will not run on any other CPUs. Note that the Linux scheduler also supports natural CPU affinity: the
scheduler attempts to keep processes on the same CPU as long as practical for performance reasons. Therefore, forcing a specific CPU
affinity is useful only in certain applications.
The CPU affinity is represented as a bitmask, with the lowest order bit corresponding to the first logical CPU and the highest order bit
corresponding to the last logical CPU. Not all CPUs may exist on a given system but a mask may specify more CPUs than are present. A
retrieved mask will reflect only the bits that correspond to CPUs physically on the system. If an invalid mask is given (i.e., one that
corresponds to no valid CPUs on the current system) an error is returned. The masks are typically given in hexadecimal. For example,
0x00000001
is processor #0
0x00000003
is processors #0 and #1
0xFFFFFFFF
is all processors (#0 through #31)
When taskset returns, it is guaranteed that the given program has been scheduled to a legal CPU.
OPTIONS
-p, --pid
operate on an existing PID and not launch a new task
-c, --cpu-list
specify a numerical list of processors instead of a bitmask. The list may contain multiple items, separated by comma, and ranges.
For example, 0,5,7,9-11.
-h, --help
display usage information and exit
-V, --version
output version information and exit
USAGE
The default behavior is to run a new command with a given affinity mask:
taskset mask command [arguments]
You can also retrieve the CPU affinity of an existing task:
taskset -p pid
Or set it:
taskset -p mask pid
PERMISSIONS
A user must possess CAP_SYS_NICE to change the CPU affinity of a process. Any user can retrieve the affinity mask.
AUTHOR
Written by Robert M. Love.
COPYRIGHT
Copyright (C) 2004 Robert M. Love
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
SEE ALSO
chrt(1), nice(1), renice(1), sched_setaffinity(2), sched_getaffinity(2)
See sched_setscheduler(2) for a description of the Linux scheduling scheme.
AVAILABILITY
The taskset command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
schedutils Apr 2003 TASKSET(1)