tree 28e77741e6fa193502cc6b5db61b1ba303e5f08c
parent b1b8af04439240c532d3530a02773b75b9853f77
author Hoa Nguyen <hoanguyen@ucdavis.edu> 1590711606 -0700
committer Bobby R. Bruce <bbruce@ucdavis.edu> 1591040449 +0000

python: Fix m5's tick rounding mechanism

Partially reverts:
https://gem5-review.googlesource.com/c/public/gem5/+/29372 where the
`math.ceil` function was used to fix an issue where 0.5 was rounded to
zero in python3. This has the side effect of giving incorrect clock
frequences due to rounding errors. To demonstrate:

```
>>> import math
>>> 1e-9*1000000000000
1000.0000000000001
>>> int(math.ceil(1e-9*1000000000000))
1001
```

The solution to this problem is to use Python's `decimal` module to
round values.

Issue-on: https://gem5.atlassian.net/browse/GEM5-616
Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu>
Change-Id: Ic76736ccb4b6b8c037103a34493aff7d9731d314
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/29577
Reviewed-by: Tiago Mück <tiago.muck@arm.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>