X-Git-Url: https://git.llucax.com/z.facultad/75.06/emufs.git/blobdiff_plain/cbb4c78bc9acf666e73b7025e2834bc52731787b..cd61d59673e28422ae9940d985868d436a75eed3:/doc/analisis.lyx

diff --git a/doc/analisis.lyx b/doc/analisis.lyx
index 05ff3c7..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 
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@@ -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 
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@@ -139,6 +153,8 @@ T2
 
 \layout Standard
 
+
+\size small 
 T3
 \end_inset 
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@@ -149,6 +165,9 @@ T3
 
 \layout Standard
 
+
+\size small 
+Tamaño de bloque: 512
 \end_inset 
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 <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 
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@@ -178,6 +199,8 @@ Inicial
 
 \layout Standard
 
+
+\size small 
 Luego de borrar
 \end_inset 
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@@ -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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@@ -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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@@ -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 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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+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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 \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 
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-196
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@@ -1779,15 +2306,18 @@ Primero descartaremos al tipo 3 como un buen modo de almacenar las facturas,
  no sea drástica como es el caso de las facturas.
  De tomar valores grande de registros, se corre el riesgo de tener mucho
  espacio desperdiciado en los datos, y tomando valores pequeños de registro
- se limita el sistema en cuanto a cantidad de items a meter en una factura
+ 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
 
 Idealmente, si solo tuvieramos altas el mejor tipo sería el 2 sin dudarlo,
- ya que aprobecha el máximo espacio al no tener pérdidas, debido a que los
+ ya que aprovecha el máximo espacio al no tener pérdidas, debido a que los
  registros van uno a continuación del otro.
  También tenemos la ventaja de que el acceso es directo.
  Para un caso teórico donde las facturas no se dan de baja, esto sería ideal.
@@ -1798,11 +2328,11 @@ Analizaremos ahora que pasa luego de borrar varios registros en posiciones
  pseudo-aleatorias.
  Primeramente se puede observar que el tamaño de datos de control es similar
  (recordar que se guarda el id del registro para poder realizar tareas de
- recuperacion de datos en caso de que el indice se dañe).
+ recuperación de datos en caso de que el índice se dañe).
  El máximo espacio libre no nos da mucha información, ya que en el caso
  del tipo 1 podríamos tener n bloques consecutivos libres y tener posiciones
  para almacenar registros grandes en ambos casos (recordar que tipo1 tiene
- recuperacion de espacio libre para n bloques consecutivos, no siempre se
+ recuperación de espacio libre para n bloques consecutivos, no siempre se
  agrega al final).
  De todos determinar un espacio libre para un archivo de tipo 2 es mucho
  más rápido que para tipo1 si el tamaño del registro es grande, ya que el
@@ -1819,7 +2349,7 @@ Pero no todo es color de rosa en el mundo de archivos de tipo2.
 \layout Standard
 
 En este caso como se trata de facturas, y suponemos que como usuarios de
- sistema queremos cancelar pocas facturas (ya que calcelar una factura significa
- que se cayo una venta) optamos por que el mejor tipo de archivo para almacenar
+ sistema queremos cancelar pocas facturas (ya que cancelar una factura significa
+ que se cayó una venta) optamos por que el mejor tipo de archivo para almacenar
  las facturas sera el tipo2.
 \the_end