different graph storage in solver partitioner

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

00:02:43

passed #1080
build_opt

00:04:01

 
  Test
passed #1081
test_debug

00:00:41

passed #1082
test_opt

00:00:33