关于mysql-bench

fangtian3000

run-all-test运行了几个小时，显示如下内容：
alter-table: Total time: 36 wallclock secs ( 0.01 usr  0.43 sys +  0.00 cusr  0.00 csys =  0.44 CPU)
ATIS: Warning: Can't execute ATIS.  Check the file 'output/ATIS-mysql_fast-Linux_2.6.18_53.el5_x86_64'
Failed (output/ATIS-mysql_fast-Linux_2.6.18_53.el5_x86_64)
big-tables: Total time: 38 wallclock secs ( 4.71 usr  9.76 sys +  0.00 cusr  0.00 csys = 14.47 CPU)
connect: Total time: 2549 wallclock secs ( 2.80 usr 114.34 sys +  0.00 cusr  0.00 csys = 117.14 CPU)
create: Total time: 622 wallclock secs ( 0.37 usr 18.10 sys +  0.00 cusr  0.00 csys = 18.47 CPU)

wallclock什么意思？ ( 0.01 usr  0.43 sys +  0.00 cusr  0.00 csys =  0.44 CPU) 《＝什么意思？