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Performance Issue

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Join Date: May 2005

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amt_muk

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Performance Issue

Apr 26th, 2007

Hi Friends,
Can any of you pls tell me (in detail) which of the following options will be faster?

Option 1:

 Help with Code Tags 
 C Syntax (Toggle Plain Text) 
int fun()
{
    if( !cm_aObject )
         return -1;
    return cm_aObject->getNum();
}
int fun()
{
    if( !cm_aObject )
         return -1;
    return cm_aObject->getNum();
}

Option 2:

 Help with Code Tags 
 C Syntax (Toggle Plain Text) 
int fun()
{
    try{
          return cm_aObject->getNum();
    }catch(...){
          return -1;
    }
}
int fun()
{
    try{
          return cm_aObject->getNum();
    }catch(...){
          return -1;
    }
}

Thanx,
Amit

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Join Date: Aug 2005

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Ancient Dragon Ancient Dragon is offline

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Re: Performance Issue

Apr 26th, 2007

Option 2 is slower because there is a lot more code to be executed.

Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.

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John A

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Re: Performance Issue

Apr 26th, 2007

That doesn't mean you should avoid exception handling; in fact the performance loss is so minimal, it's hardly worth taking that into account when trying to decide when and where to use exception handling. Option 2 is by far the most robust.

"Technological progress is like an axe in the hands of a pathological criminal."

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Join Date: May 2005

Posts: 48

Reputation: amt_muk is an unknown quantity at this point

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amt_muk

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Re: Performance Issue

Apr 27th, 2007

Thanx to both of you.

Amit

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vijayan121 vijayan121 is offline

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Re: Performance Issue

Apr 27th, 2007

•

Originally Posted by joeprogrammer

in fact the performance loss is so minimal, it's hardly worth taking that into account when trying to decide when and where to use exception handling.

not true. exceptions are designed with the idea that
a. you do not have to pay a high performance penalty in the event of there being no error
b. if there is an error, you are willing to spend time recovering from it.
c. exceptions, as the name suggests, are used to indicate exceptional conditions that do not occur in the normal course of events.

Ancient Dragon's statement is accurate; the easiest way to check it out is
a. generate the assembly code for both versions and have a look at it.
b. write a test driver and time the performance on your implementation.