`cputime', `tstart', `tstop'
----------------------------

cputime(ONOFF)
     ::  0 ʤ `cputime' ɽߤ. ʳʤɽ
     Ԥ.
tstart()
     :: CPU time ¬.
tstop()
     :: CPU time ¬λɽ.

RETURN
     0
ONOFF
     ե饰 (Ǥ)

   * `cputime()' ,  0 ʤ CPU time ɽߤ. ʳ
     ʤɽԤ.
   * `tsart' ϰʤ, `()' ʤ, CPU time ¬򳫻Ϥ.
   * `tstop' ϰʤ, `()' ʤ, CPU time ¬λ, ɽ
     .
   * `cputime(ONOFF)'  `ctrl("cputime",ONOFF)' ƱǤ.
   * `tstart', `tstop' , ҤˤƻȤ뤳ȤꤷƤʤ
     , Τ褦ʲǽˤ, `time()' ˤ¬Ԥɬ
     .
   * `cputime()' ˤ on, off , ñɽ on, off Ǥ, ȥå
     ٥ΰĤʸФ¬Ͼ˹ԤƤ. ä, ׻
     ƤǤ, ׻λ˥ǥХåä `cputime(1)' ¹Ԥ
     з׻֤ɽ.

     [49] tstart$
     [50] fctr(x^10-y^10);
     [[1,1],[x+y,1],[x^4-y*x^3+y^2*x^2-y^3*x+y^4,1],[x-y,1],
     [x^4+y*x^3+y^2*x^2+y^3*x+y^4,1]]
     [51] tstop$
     80msec + gc : 40msec
     [52] grm(katsura(4),[u4,u3,u2,u1,u0])$
     ^Cinterrupt ?(q/t/c/d/w/?) d
     stopped in gbcheck at line 186 in file "./gb/gr"
     186                     if ( !ZERO(H) )
     (debug) print cputime(1)                 
     cputime(1) = 0
     (debug) c
     580msec + gc : 320msec
     [53] 


     `time', `ctrl'

