energy minimization in namd

From: Hasan haska (hasanhaska_at_yahoo.com)
Date: Thu Apr 23 2015 - 11:29:43 CDT

Dear All,
I run 10000 step energy minimization  for my simulation system. The last part of my namd out file can be seen in below. What are DX , DU and DUDX  in “LINE MINIMIZER BRACKET”  line ?  And How can I understand that 10000 step energy minimization is enough or not to start equilibration ? 
Thanks for the explanation.
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LINE MINIMIZER BRACKET: DX 0.000236595 0.000674418 DU -0.015094 0.0970886 DUDX -97.2742 2.11463 285.38 PRESSURE: 9999 -573.684 -11.0714 1.23184 -11.0714 -539.603 14.7132 1.23184 14.7132 -162.05GPRESSURE: 9999 -572.433 -10.8975 1.2972 -11.0482 -538.393 14.5997 1.27755 14.7093 -160.769ENERGY:    9999      5759.6569      2577.9163       457.8570         0.0000        -132654.3270     25903.7601         0.0000         0.0000         0.0000         -97955.1366         0.0000    -97955.1366    -97955.1366         0.0000           -425.1123      -423.8652   1361250.0000      -425.1123      -423.8652
LINE MINIMIZER BRACKET: DX 2.36595e-05 0.000674418 DU -0.000307767 0.0970886 DUDX -7.82503 2.11463 285.38 PRESSURE: 10000 -573.698 -11.0727 1.22639 -11.0727 -539.606 14.7258 1.22639 14.7258 -162.109GPRESSURE: 10000 -572.424 -10.8974 1.29553 -11.049 -538.377 14.6077 1.27498 14.7187 -160.804TIMING: 10000  CPU: 655.865, 0.0655963/step  Wall: 655.865, 0.0655963/step, 0 hours remaining, 1873.847656 MB of memory in use.ETITLE:      TS           BOND          ANGLE          DIHED          IMPRP               ELECT            VDW       BOUNDARY           MISC        KINETIC               TOTAL           TEMP      POTENTIAL         TOTAL3        TEMPAVG            PRESSURE      GPRESSURE         VOLUME       PRESSAVG      GPRESSAVG
ENERGY:   10000      5759.7022      2577.9230       457.8567         0.0000        -132654.3854     25903.7665         0.0000         0.0000         0.0000         -97955.1369         0.0000    -97955.1369    -97955.1369         0.0000           -425.1379      -423.8685   1361250.0000      -425.1379      -423.8685
WRITING EXTENDED SYSTEM TO RESTART FILE AT STEP 10000WRITING COORDINATES TO DCD FILE AT STEP 10000WRITING COORDINATES TO RESTART FILE AT STEP 10000FINISHED WRITING RESTART COORDINATESThe last position output (seq=10000) takes 0.004 seconds, 1873.848 MB of memory in useWRITING VELOCITIES TO RESTART FILE AT STEP 10000FINISHED WRITING RESTART VELOCITIESThe last velocity output (seq=10000) takes 0.003 seconds, 1873.848 MB of memory in useREINITIALIZING VELOCITIES AT STEP 10000 TO 309 KELVIN.

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