[GitHub] [incubator-pagespeed-ngx] dennisjac commented on issue #1639: Values on statistics page not updated

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dennisjac commented on issue #1639: Values on statistics page not updated
URL: https://github.com/apache/incubator-pagespeed-ngx/issues/1639#issuecomment-479008203
 
 
   This is what my configuration looks like:
   ```
   Options
     AvoidRenamingIntrospectiveJavascript (aris)  True
     BeaconUrl (bu)                               /ngx_pagespeed_beacon
     EnableRewriting (e)                          1
     FileCacheCleanIntervalMs (afcci)             3600000
     FileCacheInodeLimit (afcl)                   500000
     FileCachePath (afcp)                         /var/cache/nginx/ngx_pagespeed_cache
     FileCacheSizeKb (afc)                        10485760
     LRUCacheByteLimit (alcb)                     32768
     LRUCacheKbPerProcess (alcp)                  16384
     RespectXForwardedProto (rxfp)                True
     RewriteLevel (l)                             Core Filters
     StatisticsPath (nsp)                         /ngx_pagespeed_statistics
   ```
   The documentation says that if no explicit shared-memory cache is specified there is a default one that will be used.
   What are the appropriate values for the cache sizes? The file cache directory is currently 7GB in size but the default shared-memory cache in only 50MB which seems tiny. On the other hand if I would increase this to say 5GB (the server has 16GB of RAM) then the snapshotting would probably cause massive disk i/o when all of this is written out.
   
   For some reason pagespeed is causing around 200 write IOPS for no apparent reason and my hope is that by configuring the in-memory caching correctly that I can fix this issue. It seems unlikely that pagespeed is updating so many files all the time so I suspect it might have something to do with metadata. 

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