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From ezko <erez.ko...@harmonicinc.com>
Subject Re: optimize ram_cache.size and ram disk size for live content
Date Thu, 07 Dec 2017 08:28:55 GMT
thanks Kit.
in my setup ATS gradually consumes the ram disk , and eventually is it fully
used.
is that expected ? 


Shu Kit Chan wrote
> I have been using tmpfs as ram disk for ATS disk cache setup in
> storage.config.
> And it is running fine for me.
> It do can get swapped out so i have to monitor my memory consumption
> very closely all the time.
> 
> Kit
> 
> On Tue, Dec 5, 2017 at 6:59 AM, ezko &lt;

> erez.koler@

> &gt; wrote:
>> Hi.
>> I'm trying to optimize ATS reverse proxy configuration.
>> My origin is serving live HLS so all objects are short term lived.
>>
>> My typical HLS live channel has 4 profiles (0.2Mbit , 0.6 Mbit , 1.2Mbit
>> and
>> 2Mbit).
>> The playlist has 15 segments , each 4 seconds in length. So the total
>> memory
>> needed to cache one HLS channel is at worst (0.2+0.6+1.2+2) * 4 * 15 = 30
>> Mbytes + a few more bytes for the playlist (i'm using header_rewite
>> plugin
>> with READ_RESPONSE_HDR_HOOK (thanks to Miles Libbey) to set the max-age
>> for
>> the segments to 60 seconds , so hopefully ATS will evict old segments in
>> step with the playlist sliding window)
>>
>> Anyway ideally I would like ATS to use RAM cache only , but i understand
>> that's currently not an option with ATS , so RAM disk is the best
>> alternative.
>>
>> Should i use ATS cache ram (proxy.config.cache.ram_cache.size) , and if
>> yes
>> what size should i set ?
>> How does ATS prevent its own cache ram from being swapped to disk ?
>>
>> For the cache file in storage.config , what type of ram disk should i use
>> ?
>> tmpfs or ramfs ?
>> tmpfs seems more controlled , but it could be swapped out.
>>
>> thanks in advance.
>>
>>
>>
>> --
>> Sent from: http://apache-traffic-server.24303.n7.nabble.com/





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Sent from: http://apache-traffic-server.24303.n7.nabble.com/

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