When the oprofile testsuite is run using tcl 8.5 or later, it appears to go into
an infinite loop. But in fact, it just slows way down. This is a result of how
a spin loop is being implemented in testsuite/lib/op_util.exp. As of tcl 8.5,
integers of arbitrary length are supported, which means they *never* overflow.
But since the arithmetic operations for the integer variables used within the
spin loop rely on the overflowing behaviour of C-stle integers, the results of
the operations were not as expected. With the latest tcl, the size of the
variables grows exponentially with the number of iterations, and so does the run
In order for the arithmetic operations within the spin loop to behave as
expected, the calculations should
use modulo 2**32 = 4294967296. See the attached patch for details.
*Will* -- can you please review this patch?
Signed-off-by: Maynard Johnson <maynardj@...>
From: Maynard Johnson <maynardj@us...> - 2010-01-12 15:13:40
William Cohen wrote:
> On 01/11/2010 04:09 PM, Maynard Johnson wrote:
>> As of tcl 8.5, integers of arbitrary length are supported
> Hi Maynard,
> The patch patch looks and works fine. Go ahead and check it in. -Will
Thanks. Patch committed.
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