From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jack Steiner Date: Wed, 09 May 2001 13:38:42 +0000 Subject: Re: [Linux-ia64] kernel update (relative to 2.4.4) Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org >> BIG CAVEAT: even though the kernel currently is syncing the cycle >> counters, application code MUST NOT rely on this. Instead, if an >> application needs fine-grained and light-weight timestamps, it should >> use the POSIX *clock* routines that Uli added recently to libc. I can >> almost guarantee you that future machines will NOT have synchronized >> clocks (and we'll also want to support systems where different CPUs >> have different clock speeds) and because of this, the *clock* routines >> and gettimeofday() are the recommended and RELIABLE way for obtaining >> fine-grained timestamps. FYI, The IA64 system being built by SGI has multiple nodes. The clocks on different nodes are not synchronized. -- Thanks Jack Steiner (651-683-5302) (vnet 233-5302) steiner@sgi.com