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Also how are you doing the object writes to benchmark it? Are you using dd?

On 3 April 2015 at 09:50, Yogesh Girikumar <yogeshg1987 at gmail.com> wrote:

> What does top say?
>
> On 3 April 2015 at 02:34, Shrinand Javadekar <shrinand at maginatics.com>
> wrote:
>
>> Hi,
>>
>> I have a single node Swift instance. It has 16 cpus, 8 disks and 64GB
>> memory. As part of testing, I am doing 256 object writes in parallel
>> for ~10 mins. Each object is also 256K bytes in size.
>>
>> While my experiment is running, I see that the CPU utilization of the
>> box is always ~100%. I am trying to understand what is causing this
>> high CPU utilization. Some of this could be attributed to:
>>
>> 1. MD5 checksum calculation done to verify every PUT.
>> 2. MD5 checksum calculation by the auditor (if it runs during this
>> interval).
>> 3. Hash calculation of the path to decide which partition the object goes
>> to.
>>
>> Are there any other CPU intensive operations happening on the system
>> that I should be aware of?
>>
>> I see that the proxy-server has a "PUT" queue. Is there some
>> processing of the data in this queue? Would simply putting data in and
>> out of the queue, streaming the data between the proxy and object
>> server use considerable CPU?
>>
>> Thanks in advance.
>> -Shri
>>
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