* Analisis con otro tamaño de bloque

[z.facultad/75.06/emufs.git] / doc / analisis.lyx

diff --git a/doc/analisis.lyx b/doc/analisis.lyx
index f9d974c2658c0fc3df918de0fb71d0cba8f49d47..9811aa27eccd843c7c110d680abf4b136c5360fd 100644 (file)
--- a/doc/analisis.lyx
+++ b/doc/analisis.lyx
@@ -75,6 +75,8 @@ Articulos
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-Evidentemente para el caso de artículos, una muy mala eleccion seria utilizar
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- Solo recordaremos compactar el archivo periodicamente a fin de minimizar
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 \end_inset 
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 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1079,15 +840,8 @@ Tama
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
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-\bar no 
-\noun off 
-\color none
-546000 bytes
+\size small 
+812 bytes

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 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1096,15 +850,8 @@ Tama
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
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-\color none
-207295 bytes
+\size small 
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 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1113,15 +860,8 @@ Tama
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 \layout Standard
 
 

-\family roman 
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-212465 bytes
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 <cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">


@@ -1130,15 +870,8 @@ Tama
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 \layout Standard
 
 

-\family roman 
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-482664 bytes
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@@ -1148,7 +881,9 @@ Tama
 
 \layout Standard
 
 
 \layout Standard
 

-Tamaño Datos de Control
+
+\size small 
+Espacio Libre

 \end_inset 
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 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1157,15 +892,8 @@ Tama
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
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-\color none
-14008 bytes
+\size small 
+1184 bytes

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 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1174,15 +902,8 @@ Tama
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
-\noun off 
-\color none
-14004 bytes
+\size small 
+................

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 \end_inset 
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 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1191,15 +912,8 @@ Tama
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
-\noun off 
-\color none
-7012 bytes
+\size small 
+5216 bytes

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 \end_inset 
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 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1208,15 +922,8 @@ Tama
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
-\noun off 
-\color none
-12288 bytes
+\size small 
+4210 bytes

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 \end_inset 
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 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1225,15 +932,8 @@ Tama
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
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-\size normal 
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-12324 bytes
+\size small 
+................

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 \end_inset 
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 <cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">


@@ -1242,15 +942,8 @@ Tama
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
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-6200 bytes
+\size small 
+13800 bytes

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 </row>
 \end_inset 
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@@ -1260,7 +953,9 @@ Tama
 
 \layout Standard
 
 
 \layout Standard
 

-Espacio Libre
+
+\size small 
+Media de Espacio Libre

 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1269,15 +964,8 @@ Espacio Libre
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
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-\shape up 
-\size normal 
-\emph off 
-\bar no 
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-\color none
-17325 bytes
+\size small 
+91 bytes

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 \end_inset 
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 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1286,15 +974,8 @@ Espacio Libre
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
-\noun off 
-\color none
-0 bytes
+\size small 
+................

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 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1303,15 +984,8 @@ Espacio Libre
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
-\noun off 
-\color none
-343000 bytes
+\size small 
+153 bytes

 \end_inset 
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 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1320,15 +994,8 @@ Espacio Libre
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
-\noun off 
-\color none
-80457 bytes
+\size small 
+323 bytes

 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1337,15 +1004,8 @@ Espacio Libre
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
-\noun off 
-\color none
-57922 bytes
+\size small 
+................

 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">


@@ -1354,24 +1014,8 @@ Espacio Libre
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
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-\noun off 
-\color none
-407148
-\family default 
-\series default 
-\shape default 
-\size default 
-\emph default 
-\bar default 
-\noun default 
-\color default
- bytes
+\size small 
+405 bytes

 \end_inset 
 </cell>
 </row>
 \end_inset 
 </cell>
 </row>


@@ -1381,7 +1025,9 @@ Espacio Libre
 
 \layout Standard
 
 
 \layout Standard
 

-Media de Espacio Libre
+
+\size small 
+Máximo de Espacio Libre

 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1390,15 +1036,8 @@ Media de Espacio Libre
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
-\noun off 
-\color none
-29 bytes
+\size small 
+938 bytes

 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1407,15 +1046,8 @@ Media de Espacio Libre
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
-\noun off 
-\color none
-0 bytes
+\size small 
+................

 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1424,24 +1056,8 @@ Media de Espacio Libre
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
-\noun off 
-\color none
-196
-\family default 
-\series default 
-\shape default 
-\size default 
-\emph default 
-\bar default 
-\noun default 
-\color default
- bytes
+\size small 
+728 bytes

 \end_inset 
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 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1450,15 +1066,8 @@ Media de Espacio Libre
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
-\noun off 
-\color none
-137 bytes
+\size small 
+938 bytes

 \end_inset 
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 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1467,15 +1076,8 @@ Media de Espacio Libre
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
-\noun off 
-\color none
-981 bytes
+\size small 
+................

 \end_inset 
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 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">


@@ -1484,34 +1086,20 @@ Media de Espacio Libre
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
-\noun off 
-\color none
-232
-\family default 
-\series default 
-\shape default 
-\size default 
-\emph default 
-\bar default 
-\noun default 
-\color default
- bytes
+\size small 
+1024 bytes

 \end_inset 
 </cell>
 </row>
 \end_inset 
 </cell>
 </row>

-<row topline="true">
+<row topline="true" bottomline="true">

 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
 \begin_inset Text
 
 \layout Standard
 
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
 \begin_inset Text
 
 \layout Standard
 

-Máximo de Espacio Libre
+
+\size small 
+Mínimo de Espacio Libre

 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1520,15 +1108,8 @@ M
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
-\noun off 
-\color none
-386 bytes
+\size small 
+0 bytes

 \end_inset 
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 \end_inset 
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 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1537,15 +1118,8 @@ M
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
-\noun off 
-\color none
-0 bytes
+\size small 
+................

 \end_inset 
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 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1554,24 +1128,8 @@ M
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
-\noun off 
-\color none
-196
-\family default 
-\series default 
-\shape default 
-\size default 
-\emph default 
-\bar default 
-\noun default 
-\color default
- bytes
+\size small 
+136 bytes

 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1580,15 +1138,8 @@ M
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
-\noun off 
-\color none
-512 bytes
+\size small 
+7 bytes

 \end_inset 
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 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1597,15 +1148,8 @@ M
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
-\noun off 
-\color none
-10656 bytes
+\size small 
+................

 \end_inset 
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 <cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">


@@ -1614,68 +1158,103 @@ M
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
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-\size normal 
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-\bar no 
-\noun off 
-\color none
-512
-\family default 
-\series default 
-\shape default 
-\size default 
-\emph default 
-\bar default 
-\noun default 
-\color default
- bytes
+\size small 
+136 bytes

 \end_inset 
 </cell>
 </row>
 \end_inset 
 </cell>
 </row>

+</lyxtabular>
+
+\end_inset 
+
+
+\layout Standard
+
+Evidentemente para el caso de artículos, una muy mala eleccion seria utilizar
+ el archivo de tipo3, puesto que al usar registros constantes es posible
+ que se desperdicie mucho espacio si ocurren muchas eliminaciones (como
+ se observa en la tabla).
+ Entre los tipos 1 y 2 no existe mucha diferencia en los números, por lo
+ que la decisión podría ser tomada en base a los tiempos de acceso.
+ Tomando este criterio el T2 sería la mejor forma de almacenar los datos
+ si lo más frecuente son lecturas, ya que al leer se puede obtener el offset
+ desde el principio del registro, mientras que en el tipo1 se debe hacer
+ una búsqueda secuencial sobre el bloque, y de ser éste último muy grande
+ el tiempo de acceso puede ser elevado.
+ 
+\layout Standard
+
+Para operaciones que requiera muchas bajas de elementos el tipo 2 no sería
+ la mejor opción, puesto que la liberación es compleja, ya que cuando se
+ da de baja un registro se debe verificar si dicho espacio se solapa con
+ algún espacio libre actual, de manera de mantener espacios libres como
+ lo hacen los sistemas de archivo ext2, manteniendo la lista de los offsets
+ y tamaño de espacios libres, a fin de buscar el que mejor ajuste en caso
+ de una alta.
+\layout Standard
+
+Para el caso de artículos, donde puede haber un continuo cambio en la oferta
+ de nuestro negocio, nos inclinaremos por el tipo de archivo 1, con un tamaño
+ de bloque reducido.
+ Solo recordaremos compactar el archivo periodicamente a fin de minimizar
+ el espacio desperdiciado.
+\layout Subsection
+
+Facturas
+\layout Standard
+
+
+\size small 
+
+\begin_inset  Tabular
+<lyxtabular version="3" rows="8" columns="7">
+<features islongtable="true">
+<column alignment="left" valignment="top" leftline="true" width="0">
+<column alignment="center" valignment="top" leftline="true" width="0">
+<column alignment="center" valignment="top" leftline="true" width="0">
+<column alignment="center" valignment="top" leftline="true" width="0">
+<column alignment="center" valignment="top" leftline="true" width="0">
+<column alignment="center" valignment="top" leftline="true" width="0">
+<column alignment="center" valignment="top" leftline="true" rightline="true" width="0">

 <row topline="true" bottomline="true">
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
 \begin_inset Text
 
 \layout Standard
 
 <row topline="true" bottomline="true">
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
 \begin_inset Text
 
 \layout Standard
 

-Mínimo de Espacio Libre
+
+\size small 
+Facturas

 \end_inset 
 </cell>
 \end_inset 
 </cell>

-<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+<cell multicolumn="1" alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">

 \begin_inset Text
 
 \layout Standard
 
 
 \begin_inset Text
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
-\noun off 
-\color none
-1 bytes
+\size small 
+T1

 \end_inset 
 </cell>
 \end_inset 
 </cell>

-<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+<cell multicolumn="1" alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">

 \begin_inset Text
 
 \layout Standard
 
 
 \begin_inset Text
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
-\noun off 
-\color none
-0 bytes
+\size small 
+T2
+\end_inset 
+</cell>
+<cell multicolumn="1" alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\layout Standard
+
+
+\size small 
+T3

 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
 \end_inset 
 </cell>
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1684,24 +1263,8 @@ M
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
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-\color none
-196
-\family default 
-\series default 
-\shape default 
-\size default 
-\emph default 
-\bar default 
-\noun default 
-\color default
- bytes
+\size small 
+T1

 \end_inset 
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 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
 \end_inset 
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 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">


@@ -1710,32 +1273,1012 @@ M
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
-\noun off 
-\color none
-1 bytes
+\size small 
+T2
+\end_inset 
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\layout Standard
+
+
+\size small 
+T3

 \end_inset 
 </cell>
 \end_inset 
 </cell>

+</row>
+<row topline="true" bottomline="true">

 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
 \begin_inset Text
 
 \layout Standard
 
 
 <cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
 \begin_inset Text
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
-\noun off 
-\color none
-216 bytes
+\size small 
+Tamaño de bloque = 512
+\end_inset 
+</cell>
+<cell multicolumn="1" alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\layout Standard
+
+
+\size small 
+Inicial
+\end_inset 
+</cell>
+<cell multicolumn="2" alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\layout Standard
+
+\end_inset 
+</cell>
+<cell multicolumn="2" alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\layout Standard
+
+\end_inset 
+</cell>
+<cell multicolumn="1" alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\layout Standard
+
+
+\size small 
+Luego de borrar
+\end_inset 
+</cell>
+<cell multicolumn="2" alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\layout Standard
+
+\end_inset 
+</cell>
+<cell multicolumn="2" alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\layout Standard
+
+\end_inset 
+</cell>
+</row>
+<row topline="true">
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\layout Standard
+
+
+\size small 
+Tamaño Datos
+\end_inset 
+</cell>
+<cell multicolumn="1" alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\layout Standard
+
+
+\size small 
+268707 bytes
+\end_inset 
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\layout Standard
+
+
+\size small 
+268707 bytes
+\end_inset 
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\layout Standard
+
+
+\size small 
+546000 bytes
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@@ -1744,24 +2287,8 @@ M
 \layout Standard
 
 
 \layout Standard
 
 

-\family roman 
-\series medium 
-\shape up 
-\size normal 
-\emph off 
-\bar no 
-\noun off 
-\color none
-196
-\family default 
-\series default 
-\shape default 
-\size default 
-\emph default 
-\bar default 
-\noun default 
-\color default
- bytes
+\size small 
+76 bytes

 \end_inset 
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 </row>
 \end_inset 
 </cell>
 </row>


@@ -1781,6 +2308,9 @@ Primero descartaremos al tipo 3 como un buen modo de almacenar las facturas,
  espacio desperdiciado en los datos, y tomando valores pequeños de registro
  se limita el sistema en cuanto a cantidad de items a colocar en una factura
  se refiere.
  espacio desperdiciado en los datos, y tomando valores pequeños de registro
  se limita el sistema en cuanto a cantidad de items a colocar en una factura
  se refiere.

+ Se puede notar una leve baja en el espacio libre, y aunmentar el tamaño
+ del bloque quizas más hga que este valor baje, pero se aumentaría el tiempo
+ de acceso a los registros.

 \layout Standard
 
 Nuevamente tenemos una disputa entre el los tipo 1 y 2.
 \layout Standard
 
 Nuevamente tenemos una disputa entre el los tipo 1 y 2.