Re: hit rates and maximum_object_size

On Sun, 12 Dec 1999, Henrik Nordstrom wrote:

> Neale Banks wrote:
>
> > Sorry, I meant to add that the cache is currently 2x4GB. As this cache is
> > currently servicing > 2GB/day, there would be little obstacle to
> > justifying more disk.
>
> What is your LRU age? (see cachemgr).

That's the "Storage LRU Expiration Age"? ....

Cache information for squid:
        Request Hit Ratios: 5min: 27.1%, 60min: 30.7%
        Byte Hit Ratios: 5min: -3.5%, 60min: -1.4%
        Storage Swap size: 7416851 KB
        Storage Mem size: 102368 KB
        Storage LRU Expiration Age: 7.96 days
        Mean Object Size: 11.25 KB
        Requests given to unlinkd: 0

Mmmm... given that I don't have any cache-digest happening, those negative
"Byte Hit Ratios" (as discussed in separate thread just now) are a bit of
concern. Maybe something like the quick-abort needs tweaking? It's
currently:

        quick_abort_min 16 KB
        quick_abort_max 16 KB
        quick_abort_pct 95

FWIW, I am seeing in the cache.log:

        aio_queue_request: WARNING - Running out of I/O theads
        aio_queue_request: Perhaps you should increase NUMTHREADS
        aio_queue_request: Or install more disks to share the load

But that _is_ a separate (performance) issue, right?

Thanks,
Neale.
Received on Sun Dec 12 1999 - 18:54:08 MST