I went to look at the source of vsftpd and make a quick modification in the
code at ftpdataio.c to do the compress. the modifaction is very simple.
by adding popen to do the fork().
the only issue I have is during the download, "500 OOPS child died"... I
need to do a trace. otherwise everything adds up when I un-compres the data
during the upload. .
John
Summerfield
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on 390 Port
<[EMAIL PROTECTED] Subject
IST.EDU> Re: FTP server doing compression
06/13/2007
06:56 PM
Please respond to
Linux on 390 Port
<[EMAIL PROTECTED]
IST.EDU>
Eddie Chen wrote:
> I like to know what are the disadvantages/advantages of having ftp
> server doing the compress during the download and uncompress from the
> upload.
>
You know the answer to this is, as always, "it depends."
With FTP or any other transmission - you can even extend it to include
tape -, it depends on the speeds of the wire and of the CPUs.
Assuming a file will compress decently - jpeg, rpms an debs don't - then
you will find it quicker to compresss, transfer then decompress, if the
link is slow.
An extreme example, but one I have to live with, is transferring files
through my modem. It doesn't matter how slow the CPU is, compression is
worth-while.
OTOH when transferring across the LAN, compression's never worth-while,
I can transfer faster than I can compress.
It might depend on cost too; I can imagine the proud owner of a Zed
deciding there are better uses for the CPU than compressing files and
instead preferring to plan around the transfer (or deciding to delegate
the task to a desktop peecee).
--
Cheers
John
-- spambait
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