From de060c4f15ee62ac074d6fad2b66426673a49398 Mon Sep 17 00:00:00 2001 From: knarf Date: Fri, 20 Feb 2004 14:26:34 +0000 Subject: - move from AlphaThorns git-svn-id: http://svn.cactuscode.org/arrangements/CactusUtils/Nice/trunk@2 ca4eca94-0e4f-0410-9877-d0c6952cf786 --- COPYING | 340 ++++++++++++++++++++++++++++++++++++++++++++++++++ README | 31 +++++ doc/documentation.tex | 54 ++++++++ interface.ccl | 4 + param.ccl | 7 ++ schedule.ccl | 6 + src/make.code.defn | 3 + src/nice.c | 147 ++++++++++++++++++++++ test/nice.par | 1 + 9 files changed, 593 insertions(+) create mode 100644 COPYING create mode 100644 README create mode 100644 doc/documentation.tex create mode 100644 interface.ccl create mode 100644 param.ccl create mode 100644 schedule.ccl create mode 100644 src/make.code.defn create mode 100644 src/nice.c create mode 100644 test/nice.par diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..5b6e7c6 --- /dev/null +++ b/COPYING @@ -0,0 +1,340 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc. + 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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If this is what you want to do, use the GNU Library General +Public License instead of this License. diff --git a/README b/README new file mode 100644 index 0000000..bd574ca --- /dev/null +++ b/README @@ -0,0 +1,31 @@ +Purpose of this thorn +--------------------- +This thorn changes the nice level of Cactus processes. + + +Documentation +------------- +Look into the doc/ directory for more documentation. + + +Copyright +--------- + +This thorn is copyright (C) 2002 +by Frank Loeffler + +This thorn is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2 of the License, or +(at your option) any later version. + +This thorn is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this thorn (see the file COPYING in this directory); +if not, write to the Free Software Foundation, Inc., 59 Temple +Place, Suite 330, Boston, MA 02111-1307 USA + diff --git a/doc/documentation.tex b/doc/documentation.tex new file mode 100644 index 0000000..901f08b --- /dev/null +++ b/doc/documentation.tex @@ -0,0 +1,54 @@ +\documentclass{article} + +% Use the Cactus ThornGuide style file +% (Automatically used from Cactus distribution, if you have a +% thorn without the Cactus Flesh download this from the Cactus +% homepage at www.cactuscode.org) +\usepackage{../../../../doc/ThornGuide/cactus} + +\begin{document} + +\title{Nice} +\author{Frank L\"offler (knarf@aei.mpg.de)} +\date{$ $Date$ $} + +\maketitle + +% Do not delete next line +% START CACTUS THORNGUIDE + +\begin{abstract} +Simple tool for using a (configurable) nice level for all processes. +\end{abstract} + +\section{Comments} + +This thorn tries to renice all processes of Cactus to a given nice level.\\ +To renice a process means to change its nice level after the start. The nice +level is a way to control the priority of processes for cpu power. It is +always a good idea to give cpu-intensive jobs (like Cactus runs) a low +priority if you are using desktop machines, especially if other people are +using them too. + +The nice level has a range of $-20$ to $19$. A higher number means less +priority. Mostly, normal processes will get $0$ and only the superuser +(root) can use negative values. Also only root can lower the nice level +of a process, so if you nice your Cactus Run to 19, you cannot renice it +later to an lower nice-level. The nice level of single +processes can be controled by the system commands $nice$ and/or $renice$. +In the case of Cactus and Lamd this is not possible at startup. Therefore +this thorn will set the nice level of your processes at CCTK\_PARAMCHECK +(in the beginning of the calculation).\\ +This thorn has only one parameter: +\begin{verbatim} + CCTK_INT Nice_nice +\end{verbatim} +which is by default 19.\\*[1cm] +Note to developers:\\ +This thorn uses $getpriority()$ and $setpriority()$ and therefore needs +the includes $<$sys/time.h$>$, $<$errno.h$>$ and $<$sys/resource.h$>$. +If these are not provided on some platform, please tell me. +% Do not delete next line +% END CACTUS THORNGUIDE + +\end{document} diff --git a/interface.ccl b/interface.ccl new file mode 100644 index 0000000..4f6ea6e --- /dev/null +++ b/interface.ccl @@ -0,0 +1,4 @@ +# Interface definition for thorn Nice + +implements: nice + diff --git a/param.ccl b/param.ccl new file mode 100644 index 0000000..1179281 --- /dev/null +++ b/param.ccl @@ -0,0 +1,7 @@ +# Parameter definitions for thorn Nice + +CCTK_INT Nice_nice "Nice level" +{ +-20:19 :: "The range for the nice is from -20 to 19, but only root can use negative values, default is 19." +} 19 + diff --git a/schedule.ccl b/schedule.ccl new file mode 100644 index 0000000..6a5ef00 --- /dev/null +++ b/schedule.ccl @@ -0,0 +1,6 @@ +# Schedule definitions for thorn Nice +schedule Nice_Renice at CCTK_STARTUP +{ + LANG: C +} "Renice the process" + diff --git a/src/make.code.defn b/src/make.code.defn new file mode 100644 index 0000000..1fa5f0a --- /dev/null +++ b/src/make.code.defn @@ -0,0 +1,3 @@ +# Main make.code.defn file for thorn Nice +# Source files in this directory +SRCS = nice.c diff --git a/src/nice.c b/src/nice.c new file mode 100644 index 0000000..1036ad1 --- /dev/null +++ b/src/nice.c @@ -0,0 +1,147 @@ +#include "cctk.h" +#include "cctk_WarnLevel.h" +#include "cctk_Arguments.h" +#include "cctk_Parameters.h" + +/* manpage of getpriority: + Including is not required these days, + but increases portability. +*/ +#include +#include +#include + +void Nice_Renice(CCTK_ARGUMENTS) +{ + /* do not declare the arguments, it will cause an error */ + DECLARE_CCTK_PARAMETERS + + int old_nice, new_nice, nice_return_value; + + /* reset error variable */ + errno=0; + /* save the old nice value */ + old_nice=getpriority(PRIO_PROCESS, 0); + /* check errno */ + if (errno) + { + switch (errno) + { + case ESRCH : /* this should never occur, since the 0 in getpriority + means this process, which should be found + */ + CCTK_INFO("getpriority received ESTCH-error."); + break; + case EINVAL : /* this should definitly not occur */ + CCTK_INFO("getpriority received EINVAL-error."); + break; + case EPERM : /* this should never occur + It means, that the user of process did not match the + callers user */ + CCTK_INFO("getpriority received EPERM-error."); + break; + case EACCES : /* This cannot occur: non root user attemted to lower + priority (since we did not call setpriority here */ + CCTK_INFO("getpriority received EACCES-error."); + break; + default: /* This should not occur, otherwise it is an + undocumented errno */ + CCTK_VInfo(CCTK_THORNSTRING, + "getpriority got undocumented errno %d", + errno); + } + CCTK_WARN(0, "This should never occur."); + /* in case CCTK_WARN did not stop the code */ + CCTK_Abort(cctkGH, 1); + } + + errno=0; + /* try to set the new priority */ + nice_return_value=setpriority(PRIO_PROCESS, 0, Nice_nice); + /* check return value */ + if (nice_return_value!=0) + { + switch (errno) + { + case ESRCH : /* this should never occur, since the 0 in setpriority + means this process, which should be found + */ + CCTK_INFO("setpriority received ESTCH-error."); + CCTK_WARN(0, "This should never occur."); + break; + case EINVAL : /* this should definitly not occur */ + CCTK_INFO("setpriority received EINVAL-error."); + CCTK_WARN(0, "This should never occur."); + break; + case EPERM : /* this should never occur + It means, that the user of process did not match the + callers user */ + CCTK_INFO("setpriority received EPERM-error."); + CCTK_WARN(0, "This should never occur."); + break; + case EACCES : /* This can occur: non root user attemted to lower + priority + */ + CCTK_WARN(0, "Only root can lower priorities."); + break; + default: /* This should not occur, otherwise it is an + undocumented errno */ + CCTK_VInfo(CCTK_THORNSTRING, + "setpriority got undocumented errno %d", + errno); + } + /* in case CCTK_WARN did not stop the code */ + CCTK_Abort(cctkGH, 1); + } + + errno=0; + /* It should ok, but check the new priority */ + new_nice=getpriority(PRIO_PROCESS, 0); + /* check errno */ + if (errno) + { + switch (errno) + { + case ESRCH : /* this should never occur, since the 0 in getpriority + means this process, which should be found */ + CCTK_INFO("getpriority received ESTCH-error."); + break; + case EINVAL : /* this should definitly not occur */ + CCTK_INFO("getpriority received EINVAL-error."); + break; + case EPERM : /* this should never occur + It means, that the user of process did not match the + callers user */ + CCTK_INFO("getpriority received EPERM-error."); + break; + case EACCES : /* This cannot occur: non root user attemted to lower + priority (since we did not call setpriority here + */ + CCTK_INFO("getpriority received EACCES-error."); + break; + default: /* This should not occur, otherwise it is an + undocumented errno */ + CCTK_VInfo(CCTK_THORNSTRING, + "getpriority got undocumented errno %d", + errno); + } + CCTK_WARN(0, "This should never occur."); + /* in case CCTK_WARN did not stop the code */ + CCTK_Abort(cctkGH, 1); + } + + if (new_nice == Nice_nice) + { + CCTK_VInfo(CCTK_THORNSTRING,"Process reniced from nice level %d to %d.", + old_nice, new_nice); + } + else + { + /* this should never occur because of the error handling before */ + CCTK_VInfo(CCTK_THORNSTRING, + "Process reniced to nice level %d instead of %d.", + new_nice, Nice_nice); + } + +} + diff --git a/test/nice.par b/test/nice.par new file mode 100644 index 0000000..0f4b964 --- /dev/null +++ b/test/nice.par @@ -0,0 +1 @@ +ActiveThorns = "nice" -- cgit v1.2.3