Index creation running now for 14 hours

I'm running 9.3.4 with slon 2.2.3, I did a drop add last night at 9pm, it
started this particular tables index creation at 10:16pm and it's still
running. 1 single core is at 100% (32 core box) and there is almost zero
I/O activity.

CentOS 6.6

16398 | clsdb | 25765 | 10 | postgres | slon.remoteWorkerThread_1 |
10.13.200.232 | | 45712 | 2015-08-25 21:12:01.6

19819-07 | 2015-08-25 21:22:08.68766-07 | 2015-08-25 22:16:03.10099-07 |
2015-08-25 22:16:03.100992-07 | f | active | select "_cls".fini

shTableAfterCopy(143); analyze "torque"."impressions";

I was wondering if there were underlying tools to see how it's progressing,
or if there is anything I can do to bump the performance mid creation?
Nothing I can do really without stopping postgres or slon, but that would
start me back at square one.

Thanks

Tory

iostat: sdb is the db directory

avg-cpu: %user %nice %system %iowait %steal %idle

3.55 0.00 0.23 0.00 0.00 96.22

Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn

sda 1.00 0.00 12.00 0 24

sdb 0.00 0.00 0.00 0 0

avg-cpu: %user %nice %system %iowait %steal %idle

3.57 0.00 0.06 0.00 0.00 96.37

Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn

sda 0.00 0.00 0.00 0 0

sdb 21.50 0.00 15484.00 0 30968

avg-cpu: %user %nice %system %iowait %steal %idle

3.72 0.00 0.06 0.00 0.00 96.22

Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn

sda 2.00 0.00 20.00 0 40

sdb 0.00 0.00 0.00 0 0

avg-cpu: %user %nice %system %iowait %steal %idle

4.06 0.00 0.05 0.02 0.00 95.87

Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn

sda 4.00 0.00 64.00 0 128

sdb 3.50 0.00 108.00 0 216

avg-cpu: %user %nice %system %iowait %steal %idle

3.36 0.00 0.03 0.00 0.00 96.61

Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn

sda 0.00 0.00 0.00 0 0

sdb 0.00 0.00 0.00 0 0

avg-cpu: %user %nice %system %iowait %steal %idle

3.41 0.00 0.06 0.00 0.00 96.53

Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn

sda 0.00 0.00 0.00 0 0

sdb 0.00 0.00 0.00 0 0

avg-cpu: %user %nice %system %iowait %steal %idle

3.45 0.00 0.27 0.00 0.00 96.28

Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn

sda 0.00 0.00 0.00 0 0

sdb 1.00 0.00 24.00 0 48

avg-cpu: %user %nice %system %iowait %steal %idle

3.50 0.00 0.30 0.00 0.00 96.20

Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn

sda 1.50 0.00 344.00 0 688

sdb 0.00 0.00 0.00 0 0