[MITgcm-support] Strange output frequency

[Gregorio Sandy]

Hi everyone,

I am running some experiments with the MITgcm. It was working fine until I increase my resolution and decrease my timestep (0.2s). I save my diagnostics as snap-shot every 5 seconds. When I look at my output, I have snap-shots filled with NaN. I checked my time output and I find some inconsistencies. While I still have output every 5 s, I have, at some times, output at 0.2s. It happens at around 1 min and around 17 min of my simulation, then after that, all my output are correct (I run my simulation 60 min). In total, I have more output than I should have (due to this strange output at 0.2s). Here are my first time output (in bold red are the output at 0.2s):

 T = 2.4, 7.4, 12.4, 17.4, 22.4, 27.4, 32.4, 37.4, 42.4, 47.4, 52.4, 57.4,
    62.4, 67.4, 67.6, 72.4, 72.6, 77.4, 82.4, 87.4, 92.4, 97.4, 102.4, 107.4,
    112.4, 117.4, 122.4, 127.4, 132.4, 137.4, 142.4, 147.4, 152.4, 157.4,
    162.4, 167.4, 172.4, 177.4, 182.4, 187.4, 192.4, 197.4, 202.4, 207.4,
    212.4, 217.4, 222.4, 227.4, 232.4, 237.4, 242.4, 247.4, 252.4, 257.4,
    262.4, 267.4, 272.4, 277.4, 282.4, 287.4, 292.4, 297.4, 302.4, 307.4,
    312.4, 317.4, 322.4, 327.4, 332.4, 337.4, 342.4, 347.4, 352.4, 357.4,
    362.4, 367.4, 372.4, 377.4, 382.4, 387.4, 392.4, 397.4, 402.4, 407.4,
    412.4, 417.4, 422.4, 427.4, 432.4, 437.4, 442.4, 447.4, 452.4, 457.4,
    462.4, 467.4, 472.4, 477.4, 482.4, 487.4, 492.4, 497.4, 502.4, 507.4,
    512.4, 517.4, 522.4, 527.4, 532.4, 537.4, 542.4, 547.4, 552.4, 557.4,
    562.4, 567.4, 572.4, 577.4, 582.4, 587.4, 592.4, 597.4, 602.4, 607.4,
    612.4, 617.4, 622.4, 627.4, 632.4, 637.4, 642.4, 647.4, 652.4, 657.4,
    662.4, 667.4, 672.4, 677.4, 682.4, 687.4, 692.4, 697.4, 702.4, 707.4,
    712.4, 717.4, 722.4, 727.4, 732.4, 737.4, 742.4, 747.4, 752.4, 757.4,
    762.4, 767.4, 772.4, 777.4, 782.4, 787.4, 792.4, 797.4, 802.4, 807.4,
    812.4, 817.4, 822.4, 827.4, 832.4, 837.4, 842.4, 847.4, 852.4, 857.4,
    862.4, 867.4, 872.4, 877.4, 882.4, 887.4, 892.4, 897.4, 902.4, 907.4,
    912.4, 917.4, 922.4, 927.4, 932.4, 937.4, 942.4, 947.4, 952.4, 957.4,
    962.4, 967.4, 972.4, 977.4, 982.4, 987.4, 992.4, 997.4, 1002.4, 1007.4,
    1012.4, 1017.4, 1022.4, 1027.4, 1027.6, 1032.4, 1032.6, 1037.4, 1037.6,
    1042.4, 1042.6, 1047.4, 1047.6, 1052.4, 1052.6, 1057.4, 1057.6, 1062.4,
    1062.6, 1067.4, 1067.6, 1072.4, 1072.6, 1077.4, 1077.6, 1082.4, 1082.6,
    1087.4, 1087.6, 1092.4, 1092.6, 1097.4, 1097.6, 1102.4, 1102.6, 1107.4,
    1107.6, 1112.4, 1112.6, 1117.4, 1117.6, 1122.4, 1122.6, 1127.4, 1127.6,
    1132.4, 1132.6, 1137.4, 1137.6, 1142.4, 1142.6, 1147.4, 1147.6, 1152.4,
    1152.6, 1157.4, 1157.6, 1162.4, 1162.6, 1167.4, 1167.6, 1172.4, 1172.6,
    1177.4, 1177.6, 1182.4, 1182.6, 1187.4, 1187.6, 1192.4, 1192.6, 1197.4,
    1197.6, 1202.4, 1202.6, 1207.4, 1207.6, 1212.4, 1212.6, 1217.4, 1217.6,
    1222.4, 1222.6, 1227.4, 1227.6, 1232.4, 1237.4, 1242.4, 1247.4, 1252.4,
    1257.4, 1262.4, 1267.4, 1272.4, 1277.4, 1282.4, 1287.4, 1292.4, 1297.4,
    1302.4, 1307.4, 1312.4, 1317.4, 1322.4, 1327.4, 1332.4, 1337.4, 1342.4,
    1347.4, 1352.4, 1357.4, 1362.4, 1367.4, 1372.4, 1377.4, 1382.4, 1387.4,
    1392.4, 1397.4, 1402.4, 1407.4, 1412.4, 1417.4, 1422.4, 1427.4, 1432.4,
    1437.4, 1442.4, 1447.4, 1452.4, 1457.4, 1462.4, 1467.4, 1472.4, 1477.4,
    1482.4, 1487.4, 1492.4, 1497.4, 1502.4, 1507.4, 1512.4, 1517.4, 1522.4,
    1527.4, 1532.4, 1537.4, 1542.4, 1547.4, 1552.4, 1557.4, 1562.4, 1567.4,
    1572.4, 1577.4, 1582.4, 1587.4, 1592.4, 1597.4, 1602.4, 1607.4, 1612.4,
    1617.4, 1622.4, 1627.4, 1632.4, 1637.4, 1642.4, 1647.4, 1652.4, 1657.4,
    1662.4, 1667.4, 1672.4, 1677.4, 1682.4, 1687.4, 1692.4, 1697.4, 1702.4,

Do you have any idea about what is going on? Also I was wondering, as a naïve question, why the first output is at 2.4s?

Many thanks for your help.

Cheers,

Sandy

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