Messages in this thread | | | Date | Wed, 27 Jan 1999 11:13:47 +0100 (CET) | From | Anders Qvist <> | Subject | Process statistics questions |
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I have a server (kernel 2.0.35, debian 2.0 installation) which is under a rather heavy total load, even though no single subsystem seems to be under excessive load. So what we're trying to do is find out what's causing the load and that's where my questions come in. To this end I have some questions I hope that someone out there might take pity on me and answer these questions:
1) The machine in question is doing quite a few context switches; around 1300-1400 per second in average, sometimes topping 4500 or more (as reported by vmstat). This is a P2-266, and my question is: how many context switches is it reasonable to expect from such a CPU? I realize the answer depends a lot on the tasks the machine performs, any opinions on the matter would be appreciated.
2) Is it possible to see how much time a single process spends waiting for I/O reads and writes? I understand top on both solaris and HP/UX reports a percentage measurement for this.
I know these questions are a bit off-topic and that everyone resents being disturbed in their bashing of the only slightly esoterical issues of virtual memory management algorithms, but I would appreciate any input in the matter as this is a rather important project to us. We have invested a lot of prestige in this project and it would greatly further the GNU/Linux cause in Sweden if it became successful (as it is a rather high profile project).
Please reply cc to me, as I am not normally on the kernel mailing list.
Quest
+------------------------------------------------------------------------+ | Three servers for the admins under the influence of rye, | | seven routers for the network techs in their halls of stone | | Nine workstations for mortal lusers doomed to die | | One NT box from the dark lord on his throne | | in the land of Redmond where the shadows lie | | One box to run them all, one box to blind them | | one box to control them all and in the darkness grind them | | from the land of Redmond where the shadows lie. | | --- Bram Smits / alt.sysadmin.recovery | +------------------------------------------------------------------------+
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