Re^2: Net::FTP Upload much slower than Dos prompt command ftp

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Re^3: Net::FTP Upload much slower than Dos prompt command ftp by timothy_k (Novice) on Jan 13, 2011 at 06:26 UTC
Thanks Marto, Monk, and Khen, I will try your suggestion tomorrow. The problem / slow thruput only when Uploading to FTP server, when download from server to local PC using Net::FTP no problem, the thruput of download same and closely same as DOS prompt command. It's interesting that NET::FTP introduces thruput problem in upload.	[reply]
Re^4: Net::FTP Upload much slower than Dos prompt command ftp by BrowserUk (Patriarch) on Jan 13, 2011 at 07:19 UTC
I believe the slowdown is caused by the default blocksize used (10k): `${*$ftp}{'net_ftp_blksize'} = abs($arg{'BlockSize'} \|\| 10240);` [download] You can easily test this hypothesis by supplying a parameter `BlockSize => 4096` to the constructor. I'd step through 1024, 2048, 4096 etc. and see what difference if any that makes to your throughput. 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.	[reply] [d/l] [select]
Re^4: Net::FTP Upload much slower than Dos prompt command ftp by Khen1950fx (Canon) on Jan 13, 2011 at 07:29 UTC
Remember, also, that upload speed depends on the capabilites of your host or provider. For example, a common ADSL configuration would be 1.54 Megabits per second for downloads, whereas uploads would be 640 Kilobits per second. That might explain the difference in thruput:).	[reply]
Re^4: Net::FTP Upload much slower than Dos prompt command ftp by timothy_k (Novice) on Jan 13, 2011 at 13:37 UTC
Hi Khen, my $ftp = Net::FTP::Throttle->new( HOST, ... Bytes_read => 8192, In above Net::FTP::Throttle, is there something like Bytes_write => 1024 or 2048 ? Since the issue is uploading only. -- Uploading the thruput is twice slower when using NET::FTP vs. Dos Prompt command ftp ftp.server.com 'put' -- Downloading: the thruput when using either NET::FTP or Dos Prompt command are closely same. The ftp server is on the WAN (in the cloud) Everything the same, configuration, settings, PC, and HW. The different is NET::FTP and Dos Prompt, and the time is about 10 minutes apart between these 2 scenarios, as 3mb file Upload with Dos Prompt it took about 2-3 minutes, and with NET::FTP it took 4-5.30 minutes each time. I did over 10 times. <Thanks everyone for help>	[reply]
Re^5: Net::FTP Upload much slower than Dos prompt command ftp by Khen1950fx (Canon) on Jan 13, 2011 at 18:50 UTC
I've been testing it, and the results are all over the map---nothing consistent. Unfortunately, Bytes_write seems to be the same as Bytes_read, so that won't help. Just make sure that you use a BlockSize suitable for your system. I tried it at 1024, 2048, 4096, and 8192. They were all about the same, time-wise.	[reply]
Re^4: Net::FTP Upload much slower than Dos prompt command ftp by timothy_k (Novice) on Jan 14, 2011 at 06:38 UTC
Hi Everyone, Thanks very much for yours input. I did try and found that adding BlockSize => 2518 (just right fit to 2 packets) and the Upload thruput of uploading 3mb now is around 82-94 sec, even better than Dos Prompt - By the way, ActivePerl does not have NET::FTP::Throttle Thanks!!!	[reply]
Re^5: Net::FTP Upload much slower than Dos prompt command ftp by marto (Cardinal) on Jan 15, 2011 at 17:00 UTC
You can install it via cpan, or add additional PPM repositories.	[reply]
Re^5: Net::FTP Upload much slower than Dos prompt command ftp by Anonymous Monk on Dec 08, 2015 at 22:49 UTC
BlockSize => 2518 now its fast thanks for your post	[reply]