Hi, Varnish uses a memory-mapped file to store its data. Therefore, it is expected to use a lot of memory. However, when the kernel gets low on memory, it will push memory-mapped back to disk. This is similar in mechanism to the kernel's disk cache.
Does anything indicate that the memory pressure is actually the problem? Perhaps try lowering the maximum number of threads. Also, perhaps try making the varnish cache file smaller. Hope this helps. - Leif
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