Re: [go-nuts] Excessive garbage collection

[Jiří Šimša]

Thank you for your explanation.

I was able to track this problem down to logic in one of the handlers
periodically invoked by the page; the handler logic would result in the
allocation pattern you described.

Best,

--
Jiří Šimša

On Tue, Oct 18, 2016 at 6:13 AM,  wrote:

> From the trace (4->4->0) it looks like the app is allocating about 4MB
> every 10ms. The app also has little (0 rounded) reachable data, sometimes
> called heap ballast. Since there is little ballast the GC is attempting to
> keep the heap from growing beyond 5MB. The GC is using about 2% of the CPU
> resources to do its job.
>
> All of this seems perfectly reasonable from the GC's perspective.
>
>
> On Tuesday, October 18, 2016 at 12:32:47 AM UTC-4, Jiří Šimša wrote:
>>
>> go version go1.7.1 darwin/amd64
>>
>> --
>> Jiří Šimša
>>
>> On Mon, Oct 17, 2016 at 8:02 PM, Ian Lance Taylor 
>> wrote:
>>
>>> On Mon, Oct 17, 2016 at 6:20 PM,   wrote:
>>> >
>>> > The backend of my web server (written in Go) have recently started
>>> consuming
>>> > large amounts of CPU. AFAICT, the CPU seems to be consumed by the
>>> garbage
>>> > collector and I would appreciate any information that would help me
>>> track
>>> > down the root cause.
>>>
>>> What version of Go?  What platform?
>>>
>>> Ian
>>>
>>
>>

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Re: [go-nuts] Excessive garbage collection

[rlh]

>From the trace (4->4->0) it looks like the app is allocating about 4MB 
every 10ms. The app also has little (0 rounded) reachable data, sometimes 
called heap ballast. Since there is little ballast the GC is attempting to 
keep the heap from growing beyond 5MB. The GC is using about 2% of the CPU 
resources to do its job. 

All of this seems perfectly reasonable from the GC's perspective.


On Tuesday, October 18, 2016 at 12:32:47 AM UTC-4, Jiří Šimša wrote:
>
> go version go1.7.1 darwin/amd64
>
> --
> Jiří Šimša
>
> On Mon, Oct 17, 2016 at 8:02 PM, Ian Lance Taylor  > wrote:
>
>> On Mon, Oct 17, 2016 at 6:20 PM,   
>> wrote:
>> >
>> > The backend of my web server (written in Go) have recently started 
>> consuming
>> > large amounts of CPU. AFAICT, the CPU seems to be consumed by the 
>> garbage
>> > collector and I would appreciate any information that would help me 
>> track
>> > down the root cause.
>>
>> What version of Go?  What platform?
>>
>> Ian
>>
>
>

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Re: [go-nuts] Excessive garbage collection

[Jiří Šimša]

go version go1.7.1 darwin/amd64

--
Jiří Šimša

On Mon, Oct 17, 2016 at 8:02 PM, Ian Lance Taylor  wrote:

> On Mon, Oct 17, 2016 at 6:20 PM,   wrote:
> >
> > The backend of my web server (written in Go) have recently started
> consuming
> > large amounts of CPU. AFAICT, the CPU seems to be consumed by the garbage
> > collector and I would appreciate any information that would help me track
> > down the root cause.
>
> What version of Go?  What platform?
>
> Ian
>

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Re: [go-nuts] Excessive garbage collection

[Ian Lance Taylor]

On Mon, Oct 17, 2016 at 6:20 PM,   wrote:
>
> The backend of my web server (written in Go) have recently started consuming
> large amounts of CPU. AFAICT, the CPU seems to be consumed by the garbage
> collector and I would appreciate any information that would help me track
> down the root cause.

What version of Go?  What platform?

Ian

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