\layout Title
+Organización de Datos (75.06)
+\newline
+Trabajo Práctico
+\newline
E
\begin_inset Formula $\mu$
\end_inset
FS
\layout Author
-Nicolás Dimov
+
+\series bold
+Grupo 11
+\series default
+
\newline
-Alan Kennedy
+Nicolás Dimov (77624)
\newline
-Leandro Lucarella
+Alan Kennedy (78907)
\newline
-Ricardo Markiewicz
+Leandro Lucarella (77891)
+\newline
+Ricardo Markiewicz (78226)
+\layout Date
+
+Primera Entrega, 19 de Abril de 2004
\layout Standard
Hacia el final de esta presentación, se observaran las pruebas realizadas
con las distintas organizaciones de archivos, y las conclusiones obtenidos
al respecto.
+\layout Section
+
+Documentación de la API
+\layout Standard
+
+Para obtener una documentación de la API más completa, se incluye en formato
+ HTML en el CD-ROM la documentación generado con Doxygen.
+ Esta documentación se encuentra en el directorio
+\family typewriter
+doc/api/html
+\family default
+.
\layout Chapter
Estructura común
Ver:
\family typewriter
emufs_tipo1_compactar()
-\layout Section
-
-Detalles de implementación (funciones internas, ver si lo ponemos o no)
\layout Chapter
Ambos programas reciben 2 parámetros : el nombre de archivo de salida y
la cantidad de entradas a generar.
+\layout Standard
+
+El generador de facturas fue diseñado para cumplir con los porcentajes pedidos
+ por el enunciado en algunos aspectos.
+ La cantidad de facturas por dia del mes es aleatoria.
\layout Section
Línea de comandos
\end_inset
.
- El archivo de notas es creado por el sistema de tipo 2 por defecto y no
- puede ser cambiado desde la línea de comandos.
- Para ello puede utilizar la opción correspondiente del menú mantenimiento.
+ Luego de los parámetros de tipo y tamaño de bloque debe especificarse el
+ tipo y tamaño de bloque para el archivo de notas.
+
\layout Standard
Debe saber que estos parámetros no son mutuamente excluyentes, por lo que
emita un mensaje de debug o warning y esta cause defectos de visualización
o el programa deje directamente de funcionar.
Esto es un defecto de la biblioteca NCurses.
+\layout Enumerate
+
+Cuando se cargan datos desde el XML y este contiene caracteres extendidos,
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+ sin importar el encoding declarado en el XML.
+ El encoding solo lo tienen en cuenta para guado se guarde.
+ No nos hemos tomado el trabajo de hacer la conversión solo por cuestiones
+ 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
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+ Los valores fueron arbitrarios y un poco más elevados que los requeridos
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+ El método de prueba fue el siguiente :
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+
+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.
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+
+Se anotaron las estadísticas nuevamente.
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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.
+\layout Standard
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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
projects / z.facultad / 75.06 / emufs.git / blobdiff