MySQL cluster speed

[Rytis Sileika]

Finally got MySQL cluster running. Here's my configuration:

Host1:
MGM+DB

Host2:
DB+API

(I need only one access point, hence 1 API instance)

Here are some ./test-insert (from sql-bench/) results:

Both DB nodes are active:
---
Inserting 100000 rows in order
Inserting 100000 rows in reverse order
Inserting 100000 rows in random order
Time for insert (300000): 413 wallclock secs (12.49 usr 5.54 sys + 0.00 cusr 0.00 csys = 18.03 CPU)
---
One DB node is active:
---
Inserting 100000 rows in order
Inserting 100000 rows in reverse order
Inserting 100000 rows in random order
Time for insert (300000): 188 wallclock secs (12.42 usr 5.61 sys + 0.00 cusr 0.00 csys = 18.03 CPU)
---
MySQL is writing to a local disk:
---
Inserting 100000 rows in order
Inserting 100000 rows in reverse order
Inserting 100000 rows in random order
Time for insert (300000): 53 wallclock secs ( 8.86 usr 4.61 sys + 0.00 cusr 0.00 csys = 13.47 CPU)
---

Any ideas why it is so slow???
(both hosts have 2GB memory, so shouldn't be a problem, NDB is told to use 512MB for a DB and 64MB for indexes)