[ASK] How to calculate pagespeed storage dir?

[Dewangga Bachrul Alam]

Hi,

Just have question about "the right way to set storage size on pagespeed dir" based on FileCacheCleanIntervalMs & FileCacheSizeKb. If I set

FileCachepath -> 2.5G (tmpfs)
FileCacheCleanIntervalMs -> 7200000 (2 hours)
FileCacheSizeKb -> 102400

What will happen with the cpu load and with the cache?
Will the cache files automatically override till clean interval triggered?
Should I increased the cachepath size?

[Otto van der Schaaf]

What will happen with the cpu load and with the cache?

I'm not sure what you are asking, could you elaborate a little?

 Will the cache files automatically override till clean interval triggered? 

Yes.

Should I increased the cachepath size?

Assuming you mean the size indicated by FileCacheSizeKb: that depends

on the amount of data which needs to be fit. The recommendations is 

about 5 times as large as your website content.

The pagespeed console is able to track the cache miss percentage, which is

useful here as a persistent high cache miss ratio probably means your cache is too

small.

You can read all about the console and how to enable it at https://developers.google.com/speed/pagespeed/module/console

Otto

 

 

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[Dewangga Bachrul Alam]

Hi otto,

I'm having trouble with cpu load while the cache size directory are full, they are bloated to memory and cpu load (compress images, js, css enabled). And my websites are user generated content, the content (images) coming from the user post. Are pagespeed suitable with my needs (user generated content website)?

Note:
I put the cache path on tmpfs for performance reason, so I only set the cache dir size 2.5G (I'm quite sure my website content more than 2.5G) :D

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[Otto van der Schaaf]

I'm having trouble with cpu load while the cache size directory are full, they are bloated to memory and cpu load (compress images, js, css enabled). And my websites are user generated content, the content (images) coming from the user post. Are pagespeed suitable with my needs (user generated content website)? 

I'd expect any cpu load caused by optimizations to settle down fairly quickly -- unless:

- your cache is not large enough - this will cause resources to be optimized over and over.

- your resource urls (images/css/js) change with a very high frequency

Running PageSpeed optimization on websites with user generated content should not pose a problem in itself.

If your cache is undersized (check the hit/miss rates) you might want to try this:

- Move the disk cache away from tmpfs and give it more disk space, to get the available space to match the 5X recommendation.

- Configure a large LRU instead. Note that the LRU memory required will be multiplied by the amount of nginx workers you are running.

To control the load caused by optimizations, either initially or because of massive user contributed content, 

you could have a look at:

RewriteRandomDropPercentage: https://developers.google.com/speed/pagespeed/module/config_filters#RewriteRandomDropPercentage

and limiting the number of concurrent image optimizations:

https://developers.google.com/speed/pagespeed/module/system#image_rewrite_max

Otto

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