How do I slow down a process? Post: 302571199

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Top Forums UNIX for Dummies Questions & Answers How do I slow down a process? Post 302571199 by Corona688 on Sunday 6th of November 2011 06:12:04 PM

11-06-2011

Registered User

Good, I have something that might work, a version of libkeepalive which I modified to overload the sleep/usleep/gettimeofday calls instead of socket calls.

I modified the 'test' program to do 11 loops of 1 second each. The FRAC fraction is used to change what 'one second' means to the program by overloading the sleep/gettimeofday calls.

Code:

$ tar -zxf libspeedhack.tar.gz
$ cd libspeedhack
$ make

...

$ time LD_PRELOAD="./libspeedhack.so" FRAC="1/3" test/test
              0	         521324
              1	         521449
              2	         521524
              3	         521625
              4	         521708
              5	         521781
              6	         521825
              7	         521900
              8	         521998
              9	         522079
             10	         522191

real	0m33.008s
user	0m0.004s
sys	0m0.004s

$ time LD_PRELOAD="./libspeedhack.so" FRAC="3/1" test/test
              0	         156361
              1	         157584
              2	         158747
              3	         159628
              4	         160923
              5	         161807
              6	         162763
              7	         163935
              8	         164756
              9	         165553
             10	         166524

real	0m3.676s
user	0m0.003s
sys	0m0.006s

$

Like the AT&T program you linked, it overrides some libc calls to do so. That's what the LD_PRELOAD is for -- to make sure it gets loaded before libc does.

Last edited by Corona688; 11-06-2011 at 09:48 PM..

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LEARN ABOUT DEBIAN

tsocks

TSOCKS(1)						      General Commands Manual							 TSOCKS(1)

NAME

       tsocks - Shell wrapper to simplify the use of the tsocks(8) library to transparently allow an application to use a SOCKS proxy

SYNOPSIS

       tsocks [application [application's arguments]]
       or tsocks [-on|-off]
       or tsocks

DESCRIPTION

       tsocks is a wrapper between the tsocks library and the application what you would like to run socksified.

OPTIONS

       [application [application's arguments]]
	      run  the	application  as specified with the environment (LD_PRELOAD) set such that tsocks(8) will transparently proxy SOCKS connec-
	      tions in that program

       [-on|-off]
	      this option adds or removes tsocks(8) from the LD_PRELOAD environment variable. When tsocks(8) is  in  this  variable  all  executed
	      applications  are  automatically	socksified. If you want to use this function, you HAVE to source the shell script from yours, like
	      this: "source /usr/bin/tsocks" or ". /usr/bin/tsocks"
	      Example:
	      ". tsocks -on" -- add the tsocks lib to LD_PRELOAD (don't forget the leading dot!)
	      ". tsocks -off" -- remove the tsocks lib from LD_PRELOAD (don't forget the leading dot!)

       [-show|-sh]
	      show the current value of the LD_PRELOAD variable

       <without any argument>
	      create a new shell with LD_PRELOAD including tsocks(8).

SEE ALSO

       tsocks.conf(5) tsocks(8)

AUTHOR

       This script was created by Tamas SZERB <toma@rulez.org> for the debian package of tsocks. It (along with this manual page) have since  been
       adapted into the main tsocks project and modified.

TSOCKS
																	 TSOCKS(1)