What are 'attaches' in vmstat?
Ozalp Babaoglu
ozalp at dm.unibo.it
Sat Mar 23 06:20:20 AEST 1991
In article <1962 at brchh104.bnr.ca> ehrlich at cs.psu.edu (Dan Ehrlich) writes:
>I have a question about vmstat. What does the 'at' field represent? The
>man page says that 'at' is the number of 'attaches'. What are 'attaches'?
Being the guilty party that added virtual memory support to bsd unix, I
feel compelled to respond. The field in question reports on the vm
system's ability to find missing pages without having to do any IO. 'at'
is the rate (pages/sec) at which this is happening. The attached pages
are typically text (code) pages left behind by an exited process that was
executing the same program. It has been a while (over 10 years) since I
did this work along with Bill Joy and I hope I am remembering correctly.
Ozalp Babaoglu E-mail: ozalp at dm.unibo.it
University of Bologna, Dept. of Mathematics
Piazza di Porta S. Donato, 5 TEL: +39 51 354430
40127 Bologna (ITALY) FAX: +39 51 354490
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