🚀 go-pugleaf

On the 08 Aug 98 00:27:51 +0000, Ian Deaville wrote,

> >Make sure
> >you set the buffers up properly too, HDToolBox defaults to 30 buffers
> >per partition which is laughably small.
> 
> So what sort of number would be better?  50, 500?  How much memory will eahc
> buffer consume?  (I have 32MB kicking around in here, so I can afford a bit...)

There is no ideal buffer size, it depends on the size of files and
directories and the number of files concurrently used.

The buffers store only meta-data (fileheaders, list blocks, allocation
bitmap, ...) and partial block reads. A good estimate is to add buffers
for the largest file you use plus the largest directory you use plus
10-20 blocks extra.

The number of buffers to hold the meta-data for a file depends on the
blocksize of the partition. With 512byte/block you need one buffer
for every 36 kbyte of a file, with 2048byte/block you need one buffer
for every 912 kbyte of a file.

The number of buffers necessary to store the meta-data of a directory
is simply the number of directory entries plus 1.

So, if your largest file is 5 Megabyte and you largest directory has 200
entries on a 512byte/block partition then I would suggest a number of
360 buffers (which occupy 180 kbyte of memory).

(Originally posted to comp.sys.amiga.misc many many moons ago by
Michael van Elst)

Worzel


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