On 2024-04-16 03:20, FredB wrote:
I'm trying to use rock store with 6.9, there is a limitation about the size of cache ?
If my calculations are correct, all cache_dirs share the same byte-size limit: A single cache_dir cannot store more than ~2048 terabytes (i.e. 2^51 bytes).
However, all cache_dir types are also limited by factors other than the total size. For example, each cache_dir cannot store more than 16'777'215 entries (2^24-1).
IIRC, rock cache_dirs also cannot have more than 2'147'483'648 slots (2^31). See cache_dir rock ... slot-size=bytes documentation for more info regarding rock slots.
Rock cache_dirs are also limited by the maximum shared memory segment size. A cache_dir index maintains an index in shared memory. That index has three components. Each component must fit into a dedicated shared memory segment (your OS configuration limits the size of that segment):
* index component A: 4 bytes per cache_dir entry * index component B: 96 bytes per cache_dir entry * index component C: 8 bytes per cache_dir slot
I tried 15000 but there is no rock db created with squid -z
What error do you get from Squid? Please note that Squid may be limited by the maximum shared memory segment size or some other limit.
My goal is using a 200G SSD disk
With default store_avg_object_size of 13KB, the 16'777'215 entry limit implies the maximum cache_dir size of ~208G, but, again, there are other limits.
Please also note that large rock cache_dirs will take a long time to be indexed on Squid startup. Rock indexing is usually done in background, but it is still a significant performance expense. Optimizing indexing is an old item on our to-do list.
HTH, Alex.
cache_dir rock /cache 1000 max-swap-rate=250 swap-timeout=350
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