On 11/10/2010 11:00 AM, Skreo wrote:
I just made a test :
<snip>
avg-cpu: %user %nice %system %iowait %steal %idle
2,23 0,00 1,40 28,11 0,00 68,26
Your iowait percentage for that 10 second interval was 28%, which is
pretty high. Solr has to make a complete copy of the index, which means
a lot of disk I/O. Optimizing an index involves more than just copying
it, though - Solr is processing every document in the old index and
writing it into the new one. This is even more load on the CPU.
Databases like MySQL are also resource intensive, especially in the I/O
department. Unless you have enough RAM to cache your MySQL databases as
well as your entire Solr index, you're always going to run into this
problem.
It's strongly recommended that you put Solr on dedicated hardware. If
you asked about this on the MySQL list, I imagine they'd make the same
recommendation regarding their software.
Shawn
