[MITgcm-support] Strange output frequency

Gregorio Sandy Sandy.Gregorio at uqar.ca
Mon May 15 08:57:09 EDT 2023 

Hi Martin,

Thanks for your explanation. I am going to change my timestep to avoid the extra output. I was not aware also that I could specify the timePhase to adjust my output values!

Have a nice day.

Cheers,

Sandy
________________________________
De : MITgcm-support <mitgcm-support-bounces at mitgcm.org> de la part de Martin Losch <Martin.Losch at awi.de>
Envoyé : lundi 15 mai 2023 08:48
À : MITgcm Support <mitgcm-support at mitgcm.org>
Objet : Re: [MITgcm-support] Strange output frequency

If you use the diagnostics pkg and specify snapshot every 5 seconds, then these will be, by default, in the middle of the 5s interval. Your timestep prevents that (can’t reach 2.5), so it uses the closest. If you want out put at 5s,10s, etc. you need to specify the timePhase = 0., or 5.,

I have no idea why it sometime goes wrong. Maybe the rounding sometimes implies .4 and sometimes .6 as the neares to .5?

Martin

On 15. May 2023, at 14:41, Gregorio Sandy <Sandy.Gregorio at uqar.ca> wrote:

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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