>The reason for my question: WOuld a RAM disk help to speed up the proxy?<
I think, this just depends on. Question of statistics. In the past I even optimized time critical real time systems response time by re-arranging the distributin of files on disk, to minimize access times, based on access frequency patterns and correlation of accesses to different files, I measured before. Direct response to your question above: YES. Under the assumption, that RAM disk has the same size as your HDDs you actually use :-) Practically, however, there will be some serious investment necessary, to fulfill this assumption, I guess. So the RAM disk will be only a fraction of the size of your HDDs. Then we need the statistics. In case you have a high hit rate just for a fraction of the size of actual HDDs, then the performance advantage should be obvious. So a simple test would be, to use HDDs just the size of the perspective RAM disk. Having a high hit byte-hitrate will indicate goof performance gain when replacing by RAM disk. On one of my squid2.7 systems I optimized caching for large objects only. Avg. object size is about 2+MB. Cache files used are almost 2x2TB (2 HDDs), however, actuall fill rate only 55% wright now. Byte hit rate is about 30+%. So, replacing this wihth a RAM-disk will not be cheap :-) For practical use, fast multiple disks, with a clever (read: simple) filesystem and clever distribution of cache files to allow parallel usage I consider this "fast enough". -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/Squid-3-2-6-hot-object-cache-tp4658133p4658135.html Sent from the Squid - Users mailing list archive at Nabble.com.
