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!important; } I haven't had to rely on page cache with ATS (unsure it'd work
reliably, given ATS's appetite for memory - ram cache + non ram cache).
But, you can configure multiple cache partitions with the required files mapped
to ramdisk (using volumes) and the rest mapped to regular disk. Cache volumes
allow mapping based on host name (hosting.config). If the domain is not unique,
you can modify the cache key to add a special domain name for the files needed
and store them in the volumes that are tied to the ramdisk.
http://trafficserver.readthedocs.org/en/latest/admin-guide/storage/index.en.html#partitioning-the-cache
http://trafficserver.readthedocs.org/en/latest/admin-guide/files/hosting.config.en.html#std:configfile-hosting.config
On Friday, April 15, 2016, 7:27 PM, ZHAOCHUNBO [赵春波] <[email protected]>
wrote:
Hi Sudheer,
Thank you very much for you suggestion.
But I think ramdisk is not suitable for my case. There are many other files in
the same domain, the storage requirement is larger than my ram storage.
Only several of them are hot files, may I have a way to make ram_cache or linux
pagecache work?
Thanks in advance,
Thomas.
________________________________________
发件人: Sudheer Vinukonda [[email protected]]
发送时间: 2016年4月15日 23:47
收件人: [email protected]
主题: Re: ram_cache for big objects
One approach is to use a ramdisk (e.g configure tmpfs ).
On Friday, April 15, 2016 12:33 AM, ZHAOCHUNBO [赵春波] <[email protected]>
wrote:
HI all,
I have met one problem:
There is one big file(600MB) and it is very hot, it is larger than `
ram_cache_cutoff ` setup:
CONFIG proxy.config.cache.ram_cache_cutoff INT 20M
I have noticed that the `rKB/s` on one disk is very high, and the disk usage is
keeping nearly 100%.
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz
await svctm %util
sde 0.00 124.00 196.33 2.33 47210.00 505.33 480.36 35.17
182.13 5.02 99.73
It seems linux pagecache does NOT work when using ATS, and ATS ram_cache does
not work either, am I correct?
What is the suggestion value of `proxy.config.cache.ram_cache.size` and
`proxy.config.cache.ram_cache_cutoff` ?
How should I handle this case?
Thanks in advance.
---
Best Regards,
Thomas
