• C

alternative to mktime and localtime

I'm writing an application where I have to call localtime
and mktime millions of times.  Unfortunately, they
decrease the overall perfomance of the software considerably (2-5 times slower). Does anybody know of any alternative
alogrithms to replace mktime and localtime that are optimized for speed?
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

What are you trying to do? Why do you have to call these functions so often?
For what they do mktime and localtime are probably higly tuned already.

Perhaps you are using localtime and mktime to get "the value of time in seconds  since  EPOCH"
In this case you should take benefit to use the System Call:
 time :
     time - get time

     #include <sys/types.h>
     #include <time.h>

     time_t time(time_t *tloc);


     time() returns the value of time in seconds  since  00:00:00
     UTC, January 1, 1970.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
stomljenAuthor Commented:
A good answer by it doesn't really answer my question, but
perhaps I haven't been explicit enough.  Anyway, I think
I figured out the only reasonable approach is to try
to reduce my calls to mktime and localtime.
You should either reject or accept this answer otherwise the question will hang around for ages.

My suggestion would be to use the 'time' functions to keep a long-term time base, and use clock() to handle short-term increments to it.  On most systems clock() is very fast.

It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.