Re: [Boost-users] boost::posix_time::ptime - performance

amit khandelwal wrote, On 9.9.2008 19:33:

For 1 million invocations of boost::posix_time::ptime ptm (boost::posix_time::microsec_clock::local_time() ); // Get current time It takes about 1 sec.

However, gettimeofday takes about 300 ms.

gettimeofday takes about 300 ms. // struct timeval tv; // gettimeofday(&tv, NULL);

Any pointers on why it takes so long? I want to ensure that timestamp call are not expensive. Any suggestion/recommendation? That depends on OS a lot. Linux' getttimeofday() is not that accurate but the call should be realtively cheap. On the other hand, FreeBSD's gettimeofday() is more accurate but the call is a lot more expensive, because of kernel/userland context switch.

-- VH