[Bug libc/12515] New: clock() does not provide the advertised precision

["stephane at magnenat dot net" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12515

           Summary: clock() does not provide the advertised precision
           Product: glibc
           Version: 2.12
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: stephane@magnenat.net


Created attachment 5263
  --> http://sourceware.org/bugzilla/attachment.cgi?id=5263
Test case that compares clock() with gettimeofday()

On Ubuntu Linux 10.10 with glibc 2.12.1-0ubuntu10.2, the clock() function, from
<time.h> has an advertised precision of 1 us (CLOCKS_PER_SEC == 1000000l). Yet,
the return value only increments every 10 ms. This low precision is very
inconvenient, especially as higher-level utilities such as boost::timer uses
it. This is not a system-level problem, because gettimeofday() returns a much
higher precision (see attached test case).

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