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Tim Wickberg authored
File deletion can be slow, especially when StateSaveLocation in on NFS or other network filesystems. Since purge_old_job() holds all the slurmctld write locks, this is especially performance sensitive. Moving this to an independent thread lets the slower filesystem cleanup happen without owning these locks. purge_old_job() then results in the purged job ids being queued in the purge_list. A race with the job id potentially wrapping around again is already prevented by _dup_job_file_test() in get_next_job_id(). Bug 3763.
b9719be2
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