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GCC s optimization knobs and switches fall into two broad categories: architecture-independent and architecture-specific optimizations. This section covers the architecture-independent optimizations. These optimizations do not depend on features specific to a given architecture, such as x86; class of processors, such as Intel IA-32 CPUs; and characteristics of a given instance of a processor family, such as a Pentium IV (Xeon). GCC s most well-known optimization switches are O; its variant -On, where n is an integer between 0 and 3; and -Os. -OO turns off optimization. -O and -O1 (which I will call level 1 optimizations) are equivalent, telling GCC to optimize code. With -O or -O1, the compiler attempts to minimize both

One of the listed ACID properties was isolation Transaction isolation refers to the extent to which changes made by one transaction can be seen by other transactions occurring in the database ( ie, under conditions of concurrent database access) At the highest possible degree of isolation, each transaction occurs as if it was the only transaction taking place at that time No changes made by other transactions are visible to it At the lowest level, anything done in one transaction, whether committed or not, can been seen by another transaction The ANSI/ISO SQL standard defines three types of interactions between concurrent transactions These are: Dirty Reads These occur while a transaction is updating a row, and a second transaction reads the row before the first transaction is committed.

If the original update rolls back, the data read by the second transaction is not the same, hence a dirty read has occurred Nonrepeatable reads These occur when a transaction is updating data while a second transaction is reading the same data, both before and after a change Data retrieved from the first query does not match the second query (this presumes that the second transaction reads the data twice: once before, and once after) Phantom reads These occur when a transaction retrieves a set of rows once, another transaction inserts or deletes a row from that same table, and the first transaction re-executes the query again only to find a row that wasn t there before, or see that a row retrieved in the original query is no longer returned in consecutive result sets The phantom is the missing or new row Lost updates.

code size and execution time without dramatically increasing compilation time. Using -O2 and -O3 will increase the optimization level from that requested by -O1, while still invoking the optimization options requested by -O1. To minimize code size, use option -Os. The tables in this section show the optimization options associated with various GCC optimization levels. To disable one of them while leaving the others enabled, negate the option using no- between -f and the optimization name. For example, to disable deferred stack pops, the command line might resemble this: $ gcc myprog.c -o myprog -O1 -fno-defer-pop

ImageMagick supplies the draw command-line option to draw simple shapes. ImageMagick supports many shapes, so I ll break them down into some categories to make the explanations a little clearer. For each shape, I ll also include a simple example. Once again, it s worth noting that all the commands demonstrated in the following sections will work on images such as photographs and diagrams, as well as these blank images that I am using here for clarity. Additionally, it s worth knowing that ImageMagick s documentation refers to these shapes as primitives this is because these shapes also include other objects such as text.

This occurs when two transactions update a row s value, and the transaction to last update the row wins Thus the first update is lost The SQL standard also identifies four isolation levels, read uncommitted, read committed, repeatable read, and serializable These levels determine which of these interactions are allowed, as described in Table 3-5 (note that SQL Server 2005 adds additional isolation levels to this standard): Table 3-5 SQL Standard Isolation Levels.

Note -f denotes a flag whose operation is machine independent, that is, it requests an optimization that can be applied regardless of the architecture (in most cases). Flags, or flag options, modify GCC s default behavior at a given optimization level but do not require specific hardware support to implement the optimization. As usual, you can specify multiple flags as needed.