Application is not using all the cpus

Issue

• This is a 4 core system, but we are observing that only one core is getting used and rest of cores are free.
• Could you please suggest any thing or let us know how to maintain queuing process in CPU.

top - 15:13:49 up 2 days,  1:31, 27 users,  load average: 3.03, 3.05, 3.07
Tasks: 984 total,   1 running, 981 sleeping,   1 stopped,   1 zombie
Cpu0  : 17.8%us, 10.6%sy,  0.0%ni, 41.6%id, 27.7%wa,  0.0%hi,  2.3%si,  0.0%st
Cpu1  :  1.3%us,  1.7%sy,  0.0%ni,  3.6%id, 93.4%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu2  :  5.6%us,  4.6%sy,  0.0%ni, 57.1%id, 32.7%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu3  :  2.3%us,  3.0%sy,  0.0%ni, 94.7%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:  32962056k total, 20956508k used, 12005548k free,    81652k buffers
Swap:  2097144k total,     3044k used,  2094100k free,  1098856k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
18228 dms_ops   16   0 67184  19m  592 S 19.1  0.1  86:59.09 vsftpd
 4622 root      15   0 13400 1772  816 R  1.3  0.0   0:00.34 top
30013 dms_ops   15   0 48564 1276  620 S  1.3  0.0   0:42.06 vsftpd
11695 dms_ch    15   0 89056 2872 1192 S  1.0  0.0   1:39.60 sshd
11696 dms_ch    16   0 89096 2848 1192 S  1.0  0.0   1:35.42 sshd
19293 dms_ops   16   0 49364 2044  592 S  1.0  0.0   0:15.60 vsftpd
23676 dms_ops   15   0 49628 2308  592 S  1.0  0.0   2:11.23 vsftpd
32263 arborftp  16   0 14248 2636  812 S  1.0  0.0   6:08.18 top
  854 root      10  -5     0    0    0 S  0.3  0.0   0:19.89 kauditd
 1318 tpanupan  15   0 88216 1828 1096 S  0.3  0.0   0:01.31 sshd