Improve work distribution. #2
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added 2 commits
July 5, 2019 14:54
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I've just realized that this project has tests and I just broke them. Please ignore the PR until I fix that :) |
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Okay, fixed the tests. Found a bug in my code, fixed that too. |
hughdbrown
reviewed
Nov 29, 2019
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| return items[start:end] | ||
| start, size = get_group_size_and_start(len(items), total_groups, group_id) | ||
| return items[start:start+size] |
There was a problem hiding this comment.
You could replace all of this with:
return items[group_id:len(items):group_size]
This is the three-argument slice-operator: [start:end:step].
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@wchill how to reach you? |
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When you have, say, 25 tests and 8 groups, the current work distribution formula will determine the group size at 4 and then the first 6 groups will be assigned 4 tests each, the 7th will get 1 and the 8th will get 0. This is bad first because it's not as uniform as it could be and second because group 8 will throw an exception (at line 21).
I replaced the formula to fix these issues. Now, all groups get to run at least
items // groupstests, and the firstitems % groupsgroups will receive an extra one. Therefore, the difference between the number of items assigned to any two group will be at most 1. Also, groups with 0 assigned items no longer raise an exception.