X-Git-Url: https://git.llucax.com/z.facultad/75.06/emufs.git/blobdiff_plain/b82f880668002338a70a2809e7f13b32eb8e3095..cd61d59673e28422ae9940d985868d436a75eed3:/doc/analisis.lyx

diff --git a/doc/analisis.lyx b/doc/analisis.lyx
index f9d974c..9811aa2 100644
--- a/doc/analisis.lyx
+++ b/doc/analisis.lyx
@@ -75,6 +75,8 @@ Articulos
 \layout Standard
 
 
+\size small 
+
 \begin_inset  Tabular
 <lyxtabular version="3" rows="8" columns="7">
 <features islongtable="true">
@@ -91,6 +93,8 @@ Articulos
 
 \layout Standard
 
+
+\size small 
 Artículos
 \end_inset 
 </cell>
@@ -99,6 +103,8 @@ Art
 
 \layout Standard
 
+
+\size small 
 T1
 \end_inset 
 </cell>
@@ -107,6 +113,8 @@ T1
 
 \layout Standard
 
+
+\size small 
 T2
 \end_inset 
 </cell>
@@ -115,6 +123,8 @@ T2
 
 \layout Standard
 
+
+\size small 
 T3
 \end_inset 
 </cell>
@@ -123,6 +133,8 @@ T3
 
 \layout Standard
 
+
+\size small 
 T1
 \end_inset 
 </cell>
@@ -131,6 +143,8 @@ T1
 
 \layout Standard
 
+
+\size small 
 T2
 \end_inset 
 </cell>
@@ -139,6 +153,8 @@ T2
 
 \layout Standard
 
+
+\size small 
 T3
 \end_inset 
 </cell>
@@ -149,6 +165,9 @@ T3
 
 \layout Standard
 
+
+\size small 
+Tamaño de bloque: 512
 \end_inset 
 </cell>
 <cell multicolumn="1" alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@@ -156,6 +175,8 @@ T3
 
 \layout Standard
 
+
+\size small 
 Inicial
 \end_inset 
 </cell>
@@ -178,6 +199,8 @@ Inicial
 
 \layout Standard
 
+
+\size small 
 Luego de borrar
 \end_inset 
 </cell>
@@ -202,6 +225,8 @@ Luego de borrar
 
 \layout Standard
 
+
+\size small 
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 \end_inset 
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@@ -211,14 +236,7 @@ Tama
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@@ -314,6 +297,8 @@ Tama
 
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@@ -426,6 +369,8 @@ Tama
 
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@@ -435,14 +380,7 @@ Espacio Libre
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@@ -452,14 +390,7 @@ Espacio Libre
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@@ -486,14 +410,7 @@ Espacio Libre
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@@ -503,14 +420,7 @@ Espacio Libre
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@@ -538,6 +441,8 @@ Espacio Libre
 
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+
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@@ -547,14 +452,7 @@ Media de Espacio Libre
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@@ -564,14 +462,7 @@ Media de Espacio Libre
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@@ -581,14 +472,7 @@ Media de Espacio Libre
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@@ -598,14 +482,7 @@ Media de Espacio Libre
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@@ -650,6 +513,8 @@ Media de Espacio Libre
 
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+
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 Máximo de Espacio Libre
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@@ -762,6 +585,8 @@ M
 
 \layout Standard
 
+
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 Mínimo de Espacio Libre
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@@ -875,42 +658,11 @@ M
 
 \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">
+<lyxtabular version="3" rows="7" columns="7">
 <features islongtable="true">
 <column alignment="left" valignment="top" leftline="true" width="0">
 <column alignment="center" valignment="top" leftline="true" width="0">
@@ -925,7 +677,9 @@ Facturas
 
 \layout Standard
 
-Facturas
+
+\size small 
+Tamaño de bloque: 1024
 \end_inset 
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 <cell multicolumn="1" alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
@@ -933,100 +687,119 @@ Facturas
 
 \layout Standard
 
-T1
+
+\size small 
+Inicial
 \end_inset 
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+<cell multicolumn="2" alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
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-T2
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+<cell multicolumn="2" alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
 \begin_inset Text
 
 \layout Standard
 
-T3
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-<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+<cell multicolumn="1" alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" rightline="true" usebox="none">
 \begin_inset Text
 
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-T1
+
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+<cell multicolumn="2" alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
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-T2
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+<cell multicolumn="2" alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
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-T3
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+<row topline="true">
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+
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+<cell multicolumn="1" alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
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+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
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+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
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+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
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 \layout Standard
 
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+
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+7902 bytes
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@@ -1036,24 +809,19 @@ Luego de borrar
 
 \layout Standard
 
-Tamaño Datos
+
+\size small 
+Tamaño Datos de Control
 \end_inset 
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-<cell multicolumn="1" alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
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@@ -1148,7 +881,9 @@ Tama
 
 \layout Standard
 
-Tamaño Datos de Control
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@@ -1260,7 +953,9 @@ Tama
 
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+
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@@ -1381,7 +1025,9 @@ Espacio Libre
 
 \layout Standard
 
-Media de Espacio Libre
+
+\size small 
+Máximo de Espacio Libre
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+
+\size small 
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+</lyxtabular>
+
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+
+
+\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.
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+
+Facturas
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+
+
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+
+\begin_inset  Tabular
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@@ -1744,24 +2287,8 @@ M
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-\noun off 
-\color none
-196
-\family default 
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- bytes
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 </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.
+ 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.