# Backfill and Fair Share

**URL:** <https://community.openpbs.org/t/backfill-and-fair-share/896>\
**Category:** Users/Site Administrators\
**Created:** [March 14, 2018, 4:18pm UTC](https://community.openpbs.org/t/backfill-and-fair-share/896 "2018-03-14T16:18:40Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![pcebull](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.openpbs.org/pcebull/32/83_2.png) [@pcebull](https://community.openpbs.org/u/pcebull)\
**Post date:** [March 14, 2018, 4:52pm UTC](https://community.openpbs.org/t/backfill-and-fair-share/896/2 "2018-03-14T16:52:47Z")

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I think you need to set strict\_ordering=True to get backfill. The number of top jobs is then set with the server or queue backfill\_depth parameter. See [“Fairshare and Large Jobs”](http://community.openpbs.org/t/fairshare-and-large-jobs/743/5?u=pcebull) on this forum.

Also, I think your job\_sort\_keys will be ignored if fairshare is turned on, unless the fairshare entities are equal. See [“Fairshare with queue priority”](http://community.openpbs.org/t/fairshare-with-queue-priority/436/11?u=pcebull) on this forum.

We use fairshare with queue priority at our site, and it seems to be behaving as we expect.

Cheers,  
Peter

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