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64 lines
2.1 KiB
Plaintext
64 lines
2.1 KiB
Plaintext
NAME
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runtime - CPU time used by the current process in both user and kernel modes
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SYNOPSIS
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runtime()
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TYPES
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return nonnegative real
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DESCRIPTION
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In POSIX based systems, this function will return the CPU seconds
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used by the current process in both user and kernel mode. Time
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spent in the kernel executing system calls and time spend executing
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user code (such as performing computation on behalf of calc) are
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both included.
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On non-POSIX based systems, this function will always return 0.
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In particular, most MS windows based systems do not have the required
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POSIX system call and so this function will always return 0.
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EXAMPLE
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The result for this example will depend on the speed of the CPU
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and precision of the operating CPU time accounting sub-system:
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; t = runtime();
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; x = ptest(2^4253-1);
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; runtime() - t;
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1.288804
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LIMITS
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On non-POSIX based systems, this function always returns 0.
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LINK LIBRARY
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none
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SEE ALSO
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config, ctime, systime, time, usertime
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## Copyright (C) 1999-2006 Landon Curt Noll
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##
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## Calc is open software; you can redistribute it and/or modify it under
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## the terms of the version 2.1 of the GNU Lesser General Public License
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## as published by the Free Software Foundation.
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##
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## Calc is distributed in the hope that it will be useful, but WITHOUT
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## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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## or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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## Public License for more details.
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##
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## A copy of version 2.1 of the GNU Lesser General Public License is
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## distributed with calc under the filename COPYING-LGPL. You should have
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## received a copy with calc; if not, write to Free Software Foundation, Inc.
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## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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##
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## @(#) $Revision: 30.1 $
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## @(#) $Id: runtime,v 30.1 2007/03/16 11:10:42 chongo Exp $
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## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/runtime,v $
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##
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## Under source code control: 1996/03/12 23:10:01
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## File existed as early as: 1996
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##
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## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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