[solved] T4-1/Solaris 11 and sudden 50% performance drop
We have a SPARC T4-1 server, running Solaris 11, and it's doing some pretty extensive parsing on roughly 100GB data set.
All was well still few weeks ago, when I was testing the performance, I was reaching rougly 50minute calculation times, and it was more or less expected performance.
Now that I started moving the server to it's final location, when testing the tools, I noticed that performance has dropped dramatically. For some reason I can't parse the data set anymore under 2 hours.. I don't understand why.
I haven't done any modifications to the system, except some network configuration - and nobody else has touched the system to my knowledge.
Where should I start looking, why the parsing performance has dropped more than 50% ? Obviously it's quite HDD intensive, since our dataset is so large, but our zpool seems to be healthy, and without any errors.
I checked /var/adm/messages, and there were no errors either.
prstat doesn't show anything odd, only our parsing process (sed) is taking most of the time.
I tried looking at iostat and vmstat, but I don't really understand them, any pointers on what I should look at ?
The output looks like this (during parsing), iostat:
vmstat:
I know that I should change our CPU threading mode to max-ipc, as it's currently throughput, but this hasn't changed since last time I run tests.
Thanks for any tips!
---------- Post updated 09-28-12 at 05:23 PM ---------- Previous update was 09-27-12 at 07:12 PM ----------
Ok, looks like I found the problem. The processing times are back to normal, after I changed the encoding back to C from UTF8.
For some reason it had become UTF-8, not sure who/what changed that - but narutally that made sed and grep work extra hard
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