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31 lines
1.4 KiB
Groff
31 lines
1.4 KiB
Groff
.SH "LINUX NOTES"
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The Linux port was written by Richard Henderson <rth@tamu.edu>.
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The CPU% calculation was brazenly stolen from the Solaris 2
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port and should be attributed to one of the many names listed
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in its man page.
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The order support was stolen from the SunOS 5 port by
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Alexey Klimkin <kad@klon.tme.mcst.ru>
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Made to work under 2.4 by William LeFebvre.
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This version of the Linux port includes automatic thread "eliding".
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In Linux, a thread is treated as another process sharing the memory
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space (as well as file table and other resources). Thus
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multiple threads appear as separate processes in most system
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utilities (see
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.IR clone (2)).
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This version of top detects child thread processes and does not
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display them separately. Instead of displaying threads individually,
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an extra column "THR" shows the number of thread processes for a
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parent process. The cpu time and percentages are added to the
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parent. This gives a display much closer to other thread-capable Unix
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systems. However, threads are still counted as separate processes in
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the process summary line.
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A process is considered a thread of its parent if the
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following values are identical to its parent: address space size,
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resident set size, code start and end program counters, and stack
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start. This heuristic can mistake a recently forked child as a thread,
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until the child has either called exec or allocated space on its own.
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