Dear Amber users,
I've been having this problem using GPU code of Amber12 to perform Umbrella sampling study. Whenever "wrapping first molecule" appeared in mdout file, several values become ***** (see below). If I let it, the simulations would come to completion. I ran these simulations on several GPUs (tesla M2090, GTX 560, 570, 580, 650Ti, 660, 680, 780) and the problem occurred on all of them. Before finding this thread (
http://archive.ambermd.org/201202/0426.html), I tried running the system both with and without iwrap but that didn't help. The system was heated slowly with ntt=3 and production runs were performed using NVT ensemble with irest = 1 and ntx = 5. I couldn't find any additional information after that thread in 2012. Is it still a bug of GPU code? Or does it have something to do with my system?
Thank you for your help.
NSTEP = 1300000 TIME(PS) = 2300.000 TEMP(K) = 298.11 PRESS = 0.0 Etot = 13796.4843 EKtot = 8434.3867 EPtot = 5362.0976 BOND = 1117.6359 ANGLE = 5675.9479 DIHED = 2508.6295 1-4 NB = 717.9007 1-4 EEL = -476.9713 VDWAALS = -4782.1699 EELEC = 585.1969 EHBOND = 0.0000 RESTRAINT = 15.9278 EAMBER (non-restraint) = 5346.1698 ------------------------------------------------------------------------------
NMR restraints: Bond = 0.442 Angle = 0.000 Torsion = 2.171===============================================================================wrapping first mol.: -64156.49584 -490243.09177 317751.07235
NSTEP = 1320000 TIME(PS) = 2320.000 TEMP(K) =********* PRESS = 0.0 Etot = ************** EKtot = ************** EPtot = ************** BOND = -0.0000 ANGLE = 798521.7102 DIHED = 6235.9991 1-4 NB = 0.0000 1-4 EEL = 0.0008 VDWAALS = 894384357.7648 EELEC = -302.2937 EHBOND = 0.0000 RESTRAINT = ************** EAMBER (non-restraint) = 895188813.1812 ------------------------------------------------------------------------------ Best regards,
Quynh Vo
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Received on Wed Apr 01 2015 - 23:30:02 PDT
