* Systemtap to predict memory upgrade needs
@ 2009-02-06 0:29 Andrew Klaassen
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From: Andrew Klaassen @ 2009-02-06 0:29 UTC (permalink / raw)
To: systemtap
Hi.
I'm brand new to systemtap. I'm trying to write a script that'll monitor a currently running fileserver and tell me how often the physical disk will get hit if I double/quadruple/etc my RAM.
Here's what I've figured out so far: I need to hook into all possible read/write operations (aio_read/write, regular read/write, readv/writev, sendfile, etc). My script then needs to duplicate the kernel buffer/paging logic, substituting my desired memory size for my actual memory size.
This seems really complicated. (I am a lowly sysadmin, so I'm way over my head here.) Is there a simpler way? Is this something someone has already built?
Thanks.
Andrew
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