3.2 Controlling Code Size Versus Speed

To balance the tradeoff between code size and speed, use the --opt_for_speed option. The level of optimization (0-5) controls the type and degree of code size or code speed optimization:

• --opt_for_speed=0

Optimizes code size with a high risk of worsening or impacting performance.

• --opt_for_speed=1

Optimizes code size with a medium risk of worsening or impacting performance.

• --opt_for_speed=2

Optimizes code size with a low risk of worsening or impacting performance.

• --opt_for_speed=3

Optimizes code performance/speed with a low risk of worsening or impacting code size.

• --opt_for_speed=4

Optimizes code performance/speed with a medium risk of worsening or impacting code size.

• --opt_for_speed=5

Optimizes code performance/speed with a high risk of worsening or impacting code size.

If you specify the --opt_for_speed option without a parameter, the default setting is --opt_for_speed=4. If you do not specify the --opt_for_speed option, the default setting is 1

The best performance for caching devices has been observed with --opt_for_speed set to level 1 or 2.