I suspect that the setting of the maximum burst rate to 10k (10240) here (in new()): 

    my $mbps = $arg{MegabitsPerSecond} || croak "No MegabitsPerSecond 
+passed";
    my $bps = $mbps * 1024 * 1024 / 8;

    my $bucket = new Algorithm::TokenBucket $bps, 10240;

[download]

Combined with the minimum accounting period of 1/100th of a second here (in get()):

        sleep 0.01 until $bucket->conform($len);
        $bucket->count($len);

[download]

Means that the maximum throughput possible is 10kbytes per 0.001 of a second = 1000KBytes or (roughly) 10Mbps.

Throw in the out-of-band overheads (writing to the local file), and that probably explains why it has a fixed upper limit regardless of your requested limit.

Two (3) possible solutions:

  1. Increase the max-burst value.

    Try doubling it and see what through put it gives you. Adjust accordingly.

  2. Decrease the accounting period.

    Try halving it. Adjust ...

  3. A mix of the two.

Also, 4096 byte blocksize seems very small for transferring large files across a network? I try 64k and see what affect that has.

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

The start of some sanity?

In reply to Re: Using Net::FTP::Throttle by BrowserUk
in thread Using Net::FTP::Throttle by joetesta

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