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Increase timestamp speed
Issue #336
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The current time stamp mechanism in simfactory creates files with a scheme "timestamp-NUMBER", where NUMBER denotes the time. Looking for such files requires iterating over the directory.
Instead, we can use a fixed file name, and use the file creation time as time stamp. (We can additionally write the time stamp into the file, probably in a human readable form.) Accessing this time stamp is a single "stat" operation that should be quicker.
This method has the additional advantage that the time stamps always have the same file name.
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One can also use touch (or os.utime) to set the file time to the client's time.
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Using the file creation time as a timestamp is prone to errors when the local time on the client on the time on the fileserver (e.g. on nfs) are off a bit. The file creation time is set by the server.
Using a fixed filename with the time in the file would not have that problem.