Can't have mongodb use multiple cores for reads

[Nike]

Hi!

I've read many discussions from this group about multiple cpus, read
http://www.mongodb.org/display/DOCS/How+does+concurrency+work but
mongo still stuck with single core. I use a few instances of a script
to test, each of them creates new connection. They send the same and
the only query (no writes, python code below)

mongo.posts_daily.find({'site_id': YYYYY, 'ts': {'$gte': XXXXXX}},
fields={'ts': 1, 't': 1, 'post_id': 1})

tried with totally identical queries and with different params, no
luck.
Made sharding just to try something different, but obviously each
mongod instance still uses one core only

What am i missing?

Thanks

[Nat]

It uses one core per query. If you have multiple queries running at the same time, it will be able to use multicore.

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[Nike]

I should be missing something
I run *a few* instances of a script, and each of them sends a query.
Aren't they "multiple" queries?

[Eliot Horowitz]

Can you send mongostat and iostat -x 2 output when running test?

[Nike]

sorry, it turned out that my test server (where I run the scripts)
wasn't powerful enough for this task
now I see 150% cpu usage and this seems to be fine

thanks