b89261ba01
Due to differences in (mainly) measuring and accumulating CPU times, the two top programs end up serving different purposes: the NetBSD top is a system administration tool, while the MINIX3 top (now mtop) is a performance debugging tool. Therefore, we keep both. The newly imported BSD top has a few MINIX3-specific changes. CPU statistics separate system time from kernel time, rather than kernel time from time spent on handling interrupts. Memory statistics show numbers that are currently relevant for MINIX3. Swap statistics are disabled entirely. All of these changes effectively bring it closer to how mtop already worked as well. Change-Id: I9611917cb03e164ddf012c5def6da0e7fede826d
27 lines
1.2 KiB
Plaintext
27 lines
1.2 KiB
Plaintext
Top and the Year 2000
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The software package top will not be affected by years numbering
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between 2000 and 2037. No portion of the top code stores dates on
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disk. All date processing in top is performed with functions from the
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Unix C library and Unix kernel. The specific functions are: time(2)
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and ctime(3S). These functions deal exclusively with conventional
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Unix time values (number of seconds since Midnight January 1, 1970
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GMT) and produce strings with a 4-digit year. At no point in the code
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for top are the last two digits used to represent a year.
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Top and the Year 2038
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In the year 2038 top will fail to represent the time of day correctly
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on 32-bit Unix operating systems. This is due to a limitation in the
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way Unix represents time. Top will only work on systems whose kernel
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call "time" and C library call "ctime" have been adjusted to represent
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time with a value greater than 32 bits. The exact date and time of
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this failure is 3:14:08 January 19, 2038 GMT. Note that this failure
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will only affect the display of the current time in the output from
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top.
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THERE IS ABSOLUTELY NO WARRANTY PROVIDED WITH THIS SOFTWARE.
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Please see the contents of the file "LICENSE" for further
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information.
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