ahuston-0/hydra
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Author SHA1 Message Date
Eelco Dolstra
4db7c51b5c Rate-limit the number of threads copying closures at the same time 
Having a hundred threads doing I/O at the same time is bad on magnetic
disks because of the excessive disk seeks. So allow only 4 threads to
copy closures in parallel.
 2015-06-23 01:49:14 +02:00
Eelco Dolstra
9cdbff2fdf Handle concurrent finishing of the same build 
There is a slight possibility that the queue monitor and a builder
thread simultaneously decide to mark a build as finished. That's fine,
as long as we ensure the DB update is idempotent (as ensured by doing
"update Builds set finished = 1 ... where finished = 0").
 2015-06-18 17:12:51 +02:00
Eelco Dolstra
e778821940 Make concurrency more robust 2015-05-29 17:14:20 +02:00