Re: [gevent] Why there is only one connection to redis used in a Gevent WSGIServer?

[Zera Holladay]

Just a theory: try changing yield to return.

-zh

On Fri, Mar 29, 2013 at 8:12 PM, Xuqing Jia <amazi...@gmail.com> wrote:

I'm using gevent to build a server which do some redis stuff and return the result to client. But the performance is bad. After some research I found that there is only one connection to redis. It looks like there is only one greenlet spawned. Here is my program:

<script src="https://gist.github.com/amazingjxq/5274574.js"></script>

Is there something wrong with my program? Why there is only one connection to redis?

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[Matthias Urlichs]

Hi,

Xuqing Jia:

> Here is my program:
>
> <script src="https://gist.github.com/amazingjxq/5274574.js"></script>
>

That's a JavaScript snippet (which doesn't make much sense to me;
document.write() is almost never what you want to use, these days).

Not Python, much less gevent.

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-- Matthias Urlichs

[Denis Bilenko]

I think the link he meant to paste is https://gist.github.com/amazingjxq/5274574

[Leif K-Brooks]

It seems to be making multiple connections to redis for me. I tested it with:

ab -n 10 -c 10 http://localhost:7332/top

And got this output:

in_use_conn: 9 created_connections: 10

in_use_conn: 8 created_connections: 10

in_use_conn: 7 created_connections: 10

in_use_conn: 6 created_connections: 10

in_use_conn: 5 created_connections: 10

in_use_conn: 4 created_connections: 10

in_use_conn: 3 created_connections: 10

in_use_conn: 2 created_connections: 10

in_use_conn: 1 created_connections: 10

in_use_conn: 0 created_connections: 10

Is it possible your testing did not actually create multiple concurrent requests?

Btw, you don't need to create an explicit redis.ConnectionPool. The redis.Redis class will create one for you automatically if you allow it to. So you can do `r = redis.Redis()` in the global scope, and use that same r object everywhere.

On Fri, Mar 29, 2013 at 5:12 PM, Xuqing Jia <amazi...@gmail.com> wrote:

I'm using gevent to build a server which do some redis stuff and return the result to client. But the performance is bad. After some research I found that there is only one connection to redis. It looks like there is only one greenlet spawned. Here is my program:

<script src="https://gist.github.com/amazingjxq/5274574.js"></script>

Is there something wrong with my program? Why there is only one connection to redis?

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