* 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 a81f70d4dbb3e3f0cd6a2cf61a9ba4d2ea249121..9811aa27eccd843c7c110d680abf4b136c5360fd 100644 (file)
--- a/doc/analisis.lyx
+++ b/doc/analisis.lyx
@@ -36,7 +36,7 @@
 \layout Title
 
 Comparacion de Tipo de archivos.
-\layout Standard
+\layout Section
 
 Método utilizado para la comparación
 \layout Standard
@@ -69,12 +69,14 @@ Se anotaron las estad
 Ahora, los tamaños de bloque para los archivos con bloques fueron tomados
  de 512 bytes, por ser una unidad típica de dispositivos de almacenamiento,
  y nos pareció lógico dada la similitud utilizar esta unidad.
-\layout Standard
+\layout Subsection
 
-De la operatorio antes descripta sale la siguiente tabla :
+Articulos
 \layout Standard
 
 
+\size small 
+
 \begin_inset  Tabular
 <lyxtabular version="3" rows="8" columns="7">
 <features islongtable="true">
@@ -91,6 +93,8 @@ De la operatorio antes descripta sale la siguiente tabla :
 
 \layout Standard
 
+
+\size small 
 Artículos
 \end_inset 
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@@ -99,6 +103,8 @@ Art
 
 \layout Standard
 
+
+\size small 
 T1
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 \layout Standard
 
+
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 T2
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 \layout Standard
 
+
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 T3
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 \layout Standard
 
+
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 T1
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 \layout Standard
 
+
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 T2
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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
 
+
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+Tamaño de bloque: 512
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 \layout Standard
 
+
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 Inicial
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@@ -178,6 +199,8 @@ Inicial
 
 \layout Standard
 
+
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 Luego de borrar
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@@ -202,6 +225,8 @@ Luego de borrar
 
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+
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 Tamaño Datos
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-Evidentemente para el caso de artículos, una muy mala eleccion seria utilizar
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- se observa en la tabla).
- Entre los tipos 1 y 2 no existe mucha diferencia en los números, por lo
- que la desición podriía ser tomada en base a los tiempos de acceso.
- Tomando este criterio el T2 sería la mejor forma de almacenar los datos
- para 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.
- 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
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- de una alta.
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+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.
+ 
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+ 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
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+
+Primero descartaremos al tipo 3 como un buen modo de almacenar las facturas,
+ por el solo hecho de que la cantidad de items que puede tener una factura
+ está limitada al tamaño de registro utilizado.
+ Esto solo sería razonable en un contexto en donde la variabilidad del registro
+ 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 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 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.
+ Hasta aquí solo hemos visto comparaciones con la carga inicial.
+\layout Standard
+
+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
+ 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
+ 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
+ archivo de tipo1 debe hacer una búsqueda sobre n bloques, mientras que
+ el tipo 2 encuentra un gap de tamaño suficiente más rápido.
+\layout Standard
+
+Pero no todo es color de rosa en el mundo de archivos de tipo2.
+ Como se dijo anteriormente las bajas de registros requieren de un proceso
+ grande al actualizar el índice de espacio libre, para asegurarse de tomar
+ espacios libres consecutivos como un solo espacio libre, y en el caso de
+ que las bajas y las altas comunes, esto es una pérdida de performance del
+ sistema.
+\layout Standard
+
+En este caso como se trata de facturas, y suponemos que como usuarios de
+ 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