Re: [Linux-ia64] kernel update (relative to 2.4.4)

From: Jack Steiner <steiner_at_sgi.com>
Date: 2001-05-09 23:38:42
>> 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
Received on Wed May 09 06:38:57 2001

This archive was generated by hypermail 2.1.8 : 2005-08-02 09:20:03 EST