different graph storage in solver partitioner

4 jobs for master in 7 minutes and 59 seconds (queued for 3 minutes and 38 seconds)
Status Name Job ID Coverage
  Build
passed build_debug #1079

00:02:43

passed build_opt #1080

00:04:01

 
  Test
passed test_debug #1081

00:00:41

passed test_opt #1082

00:00:33