runnable process search count

I m upgrading ASE to

Adaptive Server Enterprise/15.7/EBF 23823 Cluster Edition SP132 /P/RS6000/AIX 61/ase157sp131x/3919/64-bit/FBO/Tue Jan 20 07:36:36 2015

I need to modify config parameter:

1> sp_configure 'runnable process search count',2500

2> go

but getting the error below

Msg 15940, Level 16, State 3:

Server 'tv_production_st2', Procedure 'sp_configure', Line 1824:

This command is not supported in threaded mode. To achieve the same result in

threaded mode, use the 'alter thread pool' command to change 'idle timeout'.

Msg 5849, Level 16, State 1:

Server 'tv_production_st2', Procedure 'sp_configure', Line 1824:

Verification failed for parameter 'runnable process search count'.

(return status = 1)