Performance Diference between debug mode and release mode

Hi ,
I have been running an C++ multithreaded application with below technical specification on Production for more than an year.
OS - Solaris 10 , Opteron
Compiler - Sun Studio 11
Bit Mode - 64
I wanted to know what is the difference in the debug mode of an C++ application compiled with -g option and a release mode compiled with an optimization apart from the size of the binary and availability of debug information in case of a crash.
1) Does it degrade the performance of the application? If yes by what extent?
2) Does it use more memory?
3) Will switching from Debug to Release mode with some optimization coupled with any kind of risk like byte guard etc which could lead to dumps and all? If yes what could those be?
4) Which optimization level should be used?
Regards,
Ankur Verma

If you compile without any optimization (with or without -g), you will see a noticeable difference in performance in most programs compared to compiling with a reasonable level of optimization. How much difference depends on the nature of the program, and what percentage of time is spent in code regions that can benefit from the code improvements.
If you add -g, function inlining is disabled, which can dramatically reduce program performance. You can't debug a function that is generated inline, which is why this option disables inlining. (The +d option also disables inlining.)
If you use -g0 instead of -g, function inlining is preserved.
If you use -g0 with optimization, you get the advantages of optimization while still allowing limited debugging. (Local variables are not visible.) Beginning with Sun Studio 12 update 1, the current release, -g with optimization enables function inlining, so the effect of (for example) "-O -g" becomes the same as "-O -g0".
A few optimizations are disabled with -g or -g0, the exact difference depending on the compiler release and patch level. Most programs won't see a difference in performance.
Since you are running on Solaris 10, you should upgrade to the current release, Sun Studio 12 update 1. You will get many improvements and some new diagnostic tools. The new release is a drop-in replacement for Studio 11. You don't have to recompile any existing binaries, but you will want to recompile to get improved performance.
[http://developers.sun.com/sunstudio/]

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