On Wed, Mar 14, 2007 at 06:38:48PM +0000, Nick Kew wrote:
> Now, what leads you to suppose mod_line_edit uses RAM proportional
> to content size? Other than when the entire contents arrive in a
> single bucket?
Because it implements the naive filter implementation, equivalent to:
e = APR_BRIGADE_FIRST(bb);
while (e != APR_BRIGADE_SENTINEL(bb)) {
apr_bucket_read(e, ...);
...process bucket without passing on to f->next or deleting...
e = APR_BUCKET_NEXT(e);
}
for the general case given bb contains a single FILE bucket, or a
CGI/PIPE bucket, or any morphing bucket type which doesn't represent a
chunk of memory, this does:
After Iter# Contents of bb Heap memory used
1 HEAP FILE 8K
2 HEAP HEAP FILE 16K
3 HEAP HEAP HEAP FILE 24K
...
n HEAP*n n*8K
where n ~= file size / 8K; FILE buckets will also morph into MMAP
buckets so the practice is a bit more complicated but this illustrates
the point... and the 8K is really 8000 bytes.
joe
