why redis return nil when I run test? about redigo HOT 6 CLOSED

The connection Do method cannot be called concurrently.

You should use a pool. The documentation shows how to use a pool from an http request handler.

Also, check and handle errors.

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I change to use a pool ,but I get this errors sometimes

read tcp 127.0.0.1:6379: connection reset by peer

or

dial tcp 127.0.0.1:6379: can't assign requested address

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Please provide short program that demonstrates the error.

from redigo.

program like this
https://github.com/Wuyue/test_redigo/blob/master/test.go

run

wrk -t10 -c100 -d10s http://0.0.0.0:9090

and the log

...
hello 51732
hello 51732
2014/06/23 10:48:07 Dail redis server 127.0.0.1:4539 dial tcp 127.0.0.1:4539: can't assign requested address
hello %!s(<nil>)
2014/06/23 10:48:07 Dail redis server 127.0.0.1:4539 dial tcp 127.0.0.1:4539: can't assign requested address
...

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I wouldn't ping on every borrow from the code, but otherwise the code looks functionally correct.

The app is failing to connect to the Redis server. Does the Redis server log anything interesting?

How long does the app run before it generates errors?

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For what it's worth, I have a similar little app that uses radix and when I run wrk with a heavy concurrent load on it, it too spits out that error.

With radix I use the pool.NewCustomPool (see docs). I had it set to make a pool of 10 connection thingies.

But, I noticed that it only happened when I use runtime.GOMAXPROCS(runtime.NumCPU())

So, now I set the pool size to be runtime.NumCPU() * 10 and then the error stops appearing.

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