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why do fsdb waveforms of 200ns duration is increasing steadily by 20M?

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hungtaowu

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Hi all:
I was dumping several fsdb waveforms using verdi at specified time, such as 1042800ns、2085600ns、2607000ns、4171200ns...
At each sampling time, 200ns fsdb waveform is recorded using $fsdbSwitchfile、$fsdbDumpon and $fsdbDumpon with name dump_0.fsdb、dump_1.fsdb、dump_2.fsdb...
File size of dump_0.fsdb is 25M.(using $fsdbDumpfile)
File size of dump_1.fsdb is 44M.
File size of dump_2.fsdb is 63M.
...

I don't know why the file size is increasing. But when I only dump the 2nd waveform or the 3rd waveform using $fsdbDumpfile, the corresponding file size of is only 25MHz.

Can anyone help me? 3ks.

The code I used for dumping is as follows:
2015-08-28_174951.png
2015-08-28_175135.png
 

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