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From S Ahmed <sahmed1...@gmail.com>
Subject Re: HttpClient IO hits the same core
Date Tue, 15 Oct 2013 03:38:25 GMT
Interesting.  Have you tried the same test on a dedicated server?


On Mon, Oct 14, 2013 at 5:22 PM, Ke Ren <ke@spaceapegames.com> wrote:

> Hi,
>
> We are sending massive http client requests on amazon ec2 instance with 8
> cores (m3.xlarge). We notice always one core is hammered the most (80%) but
> others are just used around 30% to 40%. The httpclient we are using is
> 4.2.5. I reproduced this issue with very simple code on ec2 4 core
> instance. Basically I created one http client instance new
> DefaultHttpClient(mgr, params); mgr is a PoolingClientConnectionManager.
> This http client instance is shared by multiple threads. In this test, each
> thread worker just gets the same 700k file from s3. The result is the same.
> always just one core is hit heavily but very low usage on others. From
> jprofiler profiling, it looks the most cpu usage is on IO read from
> InputStream. I used EntityUtils.toByteArray to read data from entity. From
> netstat, there are 50 connections. The thing confuses me is why it always
> hits the same core when http responses are processed from multiple threads.
> Any ideas?
>
> Thanks in advance,
>
> Ke
>

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