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Some folks might think: “you still use RCS”?!? And we will say, hey, at least we switched from SCCS to RCS back in … I think it was around 1994 ... at least we are keeping up! :-) :-) :-) Logs say that SCCS version 18 became RCS version 19 on 1994 March 18. RCS served us well. But now it is time to move on. And so we are switching to git. Calc releases produce a lot of file changes. In the 125 releases of calc since 1996, when I started managing calc releases, there have been 15473 file mods!
114 lines
3.6 KiB
Plaintext
114 lines
3.6 KiB
Plaintext
NAME
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memsize - number of bytes required for value including overhead
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SYNOPSIS
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memsize(x)
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TYPES
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x any
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return integer
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DESCRIPTION
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This is analogous to the C operator sizeof. It attempts to assess
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the number of bytes in memory used to store a value and all its
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components plus all of the related structue overhead. Unlike
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sizeof(x), this builtin includes overhead.
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Unlike size(x), this builtin incldues the trailing \0 byte on the
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end of strings.
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Unlike sizeof(x), this builtin includes the size demonitor for integers
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and the imaginary part for complex values. Storage for holding
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0, 1 and -1 values are also included.
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The number returned by memsize(x) may be less than the actual number
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used because, for example, more memory may have been allocated for
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a string than is used: only the characters up to and including the
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first '\0' are counted in calculating the contribution of the
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string to memsize(x).
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The number returned by memsize(x) may be greater (and indeed
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substantially greater) than the number of bytes actually used.
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For example, after:
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a = sqrt(2);
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mat A[3] = {a, a, a};
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the numerical information for a, A[0], A[1], A[2] are stored in the
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same memory, so the memory used for A is the same as if
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its 3 elements were null values. The value returned by
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memsize(A) is calculated as A were defined by:
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mat A[3] = {sqrt(2), sqrt(2), sqrt(2)}.
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Similar sharing of memory occurs with literal strings.
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For associative arrays, both the name part and the value part of
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the name/value pair are counted.
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The minimum value for memsize(x) occurs for the null and error values.
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EXAMPLES
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The results for examples like these will depend to some extent on
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the system being used. The following were for an SGI R4k machine
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in 32-bit mode:
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; print memsize(null())
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8
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; print memsize(0), memsize(3), memsize(2^32 - 1), memsize(2^32)
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68 68 68 72
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; x = sqrt(2, 1e-100); print memsize(x), memsize(num(x)), memsize(den(x))
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148 108 108
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; print memsize(list()), memsize(list(1)), memsize(list(1,2))
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28 104 180
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; print memsize(list())
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28
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; print ,memsize(list(1)),memsize(list(1,2)),memsize(list(1,2,3))
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104 180 256
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; mat A[] = {1}; mat B[] = {1,2}; mat C[] = {1,2,3}; mat D[100,100];
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; print memsize(A), memsize(B), memsize(C), memsize(D)
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124 192 260 680056
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; obj point {x,y,z}
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; obj point P = {1,2,3}; print memsize(P)
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274
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LIMITS
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It is assumed memsize(x) will fit into a system long integer.
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LINK LIBRARY
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none
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SEE ALSO
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size, sizeof, fsize, strlen, digits
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## Copyright (C) 1999 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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## Under source code control: 1997/03/23 20:28:02
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## File existed as early as: 1997
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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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