From: Leandro Lucarella <llucax@gmail.com>
Date: Mon, 19 Apr 2004 10:56:43 +0000 (+0000)
Subject: Informe teoricamente terminado.
X-Git-Tag: svn_import_r684~273
X-Git-Url: https://git.llucax.com/z.facultad/75.06/emufs.git/commitdiff_plain/71a0e7aa68fc526a56ebc7740cfefeb07c535696?ds=inline

Informe teoricamente terminado.
---

diff --git a/doc/analisis.lyx b/doc/analisis.lyx
index 9811aa2..01b5cdf 100644
--- a/doc/analisis.lyx
+++ b/doc/analisis.lyx
@@ -35,27 +35,27 @@
 
 \layout Title
 
-Comparacion de Tipo de archivos.
+Comparación de Tipo de archivos.
 \layout Section
 
 Método utilizado para la comparación
 \layout Standard
 
 Para realizar la comparación entre los distintos tipos de archivo, se generaron
- un xml de articulos con 200 entradas y uno de facturas de 1750 entreadas.
- Los valores fueron arbitrarios y un poco mas elevados que los requeridos
+ un XML de artículos con 200 entradas y uno de facturas de 1750 entradas.
+ Los valores fueron arbitrarios y un poco más elevados que los requeridos
  en el enunciado para poner a prueba el sistema.
 \layout Standard
 
 En la tabla que se dará más adelante, se pueden apreciar los datos característic
 os de cada tipo de archivo.
- El métido de prueba fue el siguiente :
+ El método de prueba fue el siguiente :
 \layout Enumerate
 
-Para cada tipo de archivo se cargaron los archivos xml de prueba
+Para cada tipo de archivo se cargaron los archivos XML de prueba.
 \layout Enumerate
 
-Se anotaron las estadísticas que entrega la GUI
+Se anotaron las estadísticas que entrega la GUI.
 \layout Enumerate
 
 Se eliminaron alrededor de 50 artículos y 200 facturas.
@@ -71,7 +71,18 @@ Ahora, los tama
  y nos pareció lógico dada la similitud utilizar esta unidad.
 \layout Subsection
 
-Articulos
+Artículos
+\layout Standard
+
+
+\begin_inset Float table
+placement H
+wide false
+collapsed true
+
+\layout Caption
+
+Artículos con archivos con tamaño de bloque 512 (cuando aplica)
 \layout Standard
 
 
@@ -656,13 +667,24 @@ M
 \end_inset 
 
 
+\end_inset 
+
+ 
+\begin_inset Float table
+placement H
+wide false
+collapsed true
+
+\layout Caption
+
+Artículos con archivos con tamaño de bloque 1024 (cuando aplica)
 \layout Standard
 
 
 \size small 
 
 \begin_inset  Tabular
-<lyxtabular version="3" rows="7" columns="7">
+<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">
@@ -678,6 +700,66 @@ M
 \layout Standard
 
 
+\size small 
+Luego de borrar
+\end_inset 
+</cell>
+<cell alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\layout Standard
+
+T1
+\end_inset 
+</cell>
+<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\layout Standard
+
+T2
+\end_inset 
+</cell>
+<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\layout Standard
+
+T3
+\end_inset 
+</cell>
+<cell alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\layout Standard
+
+T1
+\end_inset 
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\layout Standard
+
+T2
+\end_inset 
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\layout Standard
+
+T3
+\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
+
+
 \size small 
 Tamaño de bloque: 1024
 \end_inset 
@@ -1168,9 +1250,12 @@ M
 \end_inset 
 
 
+\end_inset 
+
+
 \layout Standard
 
-Evidentemente para el caso de artículos, una muy mala eleccion seria utilizar
+Evidentemente para el caso de artículos, una muy mala elección sería 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).
@@ -1181,7 +1266,6 @@ Evidentemente para el caso de art
  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
@@ -1196,7 +1280,7 @@ Para operaciones que requiera muchas bajas de elementos el tipo 2 no ser
 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
+ Solo recordaremos compactar el archivo periódicamente a fin de minimizar
  el espacio desperdiciado.
 \layout Subsection
 
@@ -1204,6 +1288,17 @@ Facturas
 \layout Standard
 
 
+\begin_inset Float table
+placement H
+wide false
+collapsed true
+
+\layout Caption
+
+Facturas con archivos con tamaño de bloque 512 (cuando aplica)
+\layout Standard
+
+
 \size small 
 
 \begin_inset  Tabular
@@ -1785,13 +1880,24 @@ M
 \end_inset 
 
 
+\end_inset 
+
+ 
+\begin_inset Float table
+placement H
+wide false
+collapsed true
+
+\layout Caption
+
+Artículos con archivos con tamaño de bloque 1024 (cuando aplica)
 \layout Standard
 
 
 \size small 
 
 \begin_inset  Tabular
-<lyxtabular version="3" rows="7" columns="7">
+<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">
@@ -1806,8 +1912,73 @@ M
 
 \layout Standard
 
+Facturas
+\end_inset 
+</cell>
+<cell alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
+\begin_inset Text
 
-\size small 
+\layout Standard
+
+T1
+\end_inset 
+</cell>
+<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\layout Standard
+
+T2
+\end_inset 
+</cell>
+<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\layout Standard
+
+T3
+\end_inset 
+</cell>
+<cell alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\layout Standard
+
+T1
+\end_inset 
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\layout Standard
+
+T2
+\end_inset 
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\layout Standard
+
+T3
+\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
+
+
+\family roman 
+\series medium 
+\shape up 
+\size normal 
+\emph off 
+\bar no 
+\noun off 
+\color none
 Tamaño de bloque: 1024
 \end_inset 
 </cell>
@@ -1817,7 +1988,14 @@ Tama
 \layout Standard
 
 
-\size small 
+\family roman 
+\series medium 
+\shape up 
+\size normal 
+\emph off 
+\bar no 
+\noun off 
+\color none
 Inicial
 \end_inset 
 </cell>
@@ -1841,7 +2019,14 @@ Inicial
 \layout Standard
 
 
-\size small 
+\family roman 
+\series medium 
+\shape up 
+\size normal 
+\emph off 
+\bar no 
+\noun off 
+\color none
 Luego de borrar
 \end_inset 
 </cell>
@@ -2297,26 +2482,29 @@ M
 \end_inset 
 
 
+\end_inset 
+
+
 \layout Standard
 
 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
+ por el sólo hecho de que la cantidad de ítems 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
+ Esto sólo 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 limita el sistema en cuanto a cantidad de ítems 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
+ Se puede notar una leve baja en el espacio libre, y aumentar el tamaño
+ del bloque quizás más haga 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,
+Idealmente, si sólo tuviéramos 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.
diff --git a/doc/informe.lyx b/doc/informe.lyx
index e9b5fd8..e3f418b 100644
--- a/doc/informe.lyx
+++ b/doc/informe.lyx
@@ -37,6 +37,12 @@ E
 FS
 \layout Author
 
+
+\series bold 
+Grupo 11
+\series default 
+
+\newline 
 Nicolás Dimov (77624)
 \newline 
 Alan Kennedy (78907)
@@ -4129,8 +4135,2509 @@ Cuando se cargan datos desde el XML y este contiene caracteres extendidos,
  de tiempo.
 \layout Chapter
 
-Conclusiones
+Comparación de tipos de archivo (conclusiones)
+\layout Section
+
+Método utilizado para la comparación
+\layout Standard
+
+Para realizar la comparación entre los distintos tipos de archivo, se generaron
+ un XML de artículos con 200 entradas y uno de facturas de 1750 entradas.
+ Los valores fueron arbitrarios y un poco más elevados que los requeridos
+ en el enunciado para poner a prueba el sistema.
+\layout Standard
+
+En la tabla que se dará más adelante, se pueden apreciar los datos característic
+os de cada tipo de archivo.
+ El método de prueba fue el siguiente :
+\layout Enumerate
+
+Para cada tipo de archivo se cargaron los archivos XML de prueba.
+\layout Enumerate
+
+Se anotaron las estadísticas que entrega la GUI.
+\layout Enumerate
+
+Se eliminaron alrededor de 50 artículos y 200 facturas.
+ El valor no es exacto, puesto que al ser pseudo-aleatoria la cantidad borrada
+ puede no ser 50 o 200.
+\layout Enumerate
+
+Se anotaron las estadísticas nuevamente.
+\layout Standard
+
+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 Section
+
+Artículos
+\layout Standard
+
+
+\begin_inset Float table
+placement H
+wide false
+collapsed true
+
+\layout Caption
+
+Artículos con archivos con tamaño de bloque 512 (cuando aplica)
+\layout Standard
+
+
+\size small 
+
+\begin_inset  Tabular
+<lyxtabular version="3" rows="8" columns="7">
+<features islongtable="true">
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+Evidentemente para el caso de artículos, una muy mala elección sería 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
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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.
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+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 periódicamente a fin de minimizar
+ el espacio desperdiciado.
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+
+Primero descartaremos al tipo 3 como un buen modo de almacenar las facturas,
+ por el sólo hecho de que la cantidad de ítems que puede tener una factura
+ está limitada al tamaño de registro utilizado.
+ Esto sólo 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 ítems a colocar en una factura
+ se refiere.
+ Se puede notar una leve baja en el espacio libre, y aumentar el tamaño
+ del bloque quizás más haga 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 sólo tuviéramos 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
 
-Las comparaciones, pruebas, etc...
+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